HDFS-9461. DiskBalancer: Add Report Command. Contributed by Xiaobing Zhou.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/diskbalancer/command/Command.java

@@ -21,6 +21,8 @@ package org.apache.hadoop.hdfs.server.diskbalancer.command;
 import com.google.common.base.Preconditions;
 import org.apache.commons.cli.CommandLine;
 import org.apache.commons.cli.Option;
+import org.apache.commons.lang.StringUtils;
+import org.apache.commons.lang.text.StrBuilder;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.conf.Configured;
 import org.apache.hadoop.fs.CommonConfigurationKeys;
@@ -70,6 +72,7 @@ public abstract class Command extends Configured {
   private URI clusterURI;
   private FileSystem fs = null;
   private DiskBalancerCluster cluster = null;
+  private int topNodes;
 
   private static final Path DEFAULT_LOG_DIR = new Path("/system/diskbalancer");
 
@@ -83,6 +86,7 @@ public abstract class Command extends Configured {
     // These arguments are valid for all commands.
     addValidCommandParameters(DiskBalancer.HELP, "Help for this command");
     addValidCommandParameters("arg", "");
+    topNodes = 0;
   }
 
   /**
@@ -391,4 +395,67 @@ public abstract class Command extends Configured {
   protected DiskBalancerCluster getCluster() {
     return cluster;
   }
+
+  /**
+   * returns default top number of nodes.
+   * @return default top number of nodes.
+   */
+  protected int getDefaultTop() {
+    return DiskBalancer.DEFAULT_TOP;
+  }
+
+  /**
+   * Put output line to log and string buffer.
+   * */
+  protected void recordOutput(final StrBuilder result,
+      final String outputLine) {
+    LOG.info(outputLine);
+    result.appendln(outputLine);
+  }
+
+  /**
+   * Parse top number of nodes to be processed.
+   * @return top number of nodes to be processed.
+   */
+  protected int parseTopNodes(final CommandLine cmd, final StrBuilder result) {
+    String outputLine = "";
+    int nodes = 0;
+    final String topVal = cmd.getOptionValue(DiskBalancer.TOP);
+    if (StringUtils.isBlank(topVal)) {
+      outputLine = String.format(
+          "No top limit specified, using default top value %d.",
+          getDefaultTop());
+      LOG.info(outputLine);
+      result.appendln(outputLine);
+      nodes = getDefaultTop();
+    } else {
+      try {
+        nodes = Integer.parseInt(topVal);
+      } catch (NumberFormatException nfe) {
+        outputLine = String.format(
+            "Top limit input is not numeric, using default top value %d.",
+            getDefaultTop());
+        LOG.info(outputLine);
+        result.appendln(outputLine);
+        nodes = getDefaultTop();
+      }
+    }
+
+    return Math.min(nodes, cluster.getNodes().size());
+  }
+
+  /**
+   * Set top number of nodes to be processed.
+   * */
+  public void setTopNodes(int topNodes) {
+    this.topNodes = topNodes;
+  }
+
+  /**
+   * Get top number of nodes to be processed.
+   * @return top number of nodes to be processed.
+   * */
+  public int getTopNodes() {
+    return topNodes;
+  }
 }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/diskbalancer/command/ReportCommand.java

@@ -0,0 +1,197 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with this
+ * work for additional information regarding copyright ownership.  The ASF
+ * licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p/>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p/>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+package org.apache.hadoop.hdfs.server.diskbalancer.command;
+
+import java.io.PrintStream;
+import java.util.Collections;
+import java.util.ListIterator;
+
+import org.apache.commons.cli.CommandLine;
+import org.apache.commons.lang.StringUtils;
+import org.apache.commons.lang.text.StrBuilder;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hdfs.server.diskbalancer.datamodel.DiskBalancerDataNode;
+import org.apache.hadoop.hdfs.server.diskbalancer.datamodel.DiskBalancerVolume;
+import org.apache.hadoop.hdfs.server.diskbalancer.datamodel.DiskBalancerVolumeSet;
+import org.apache.hadoop.hdfs.tools.DiskBalancer;
+
+import com.google.common.base.Preconditions;
+
+/**
+ * Executes the report command.
+ *
+ * This command will report volume information for a specific DataNode or top X
+ * DataNode(s) benefiting from running DiskBalancer.
+ *
+ * This is done by reading the cluster info, sorting the DiskbalancerNodes by
+ * their NodeDataDensity and printing out the info.
+ */
+public class ReportCommand extends Command {
+
+  private PrintStream out;
+
+  public ReportCommand(Configuration conf, final PrintStream out) {
+    super(conf);
+    this.out = out;
+
+    addValidCommandParameters(DiskBalancer.REPORT,
+        "Report volume information of nodes.");
+
+    String desc = String.format(
+        "Top number of nodes to be processed. Default: %d", getDefaultTop());
+    addValidCommandParameters(DiskBalancer.TOP, desc);
+
+    desc = String.format("Print out volume information for a DataNode.");
+    addValidCommandParameters(DiskBalancer.NODE, desc);
+  }
+
+  @Override
+  public void execute(CommandLine cmd) throws Exception {
+    StrBuilder result = new StrBuilder();
+    String outputLine = "Processing report command";
+    recordOutput(result, outputLine);
+
+    Preconditions.checkState(cmd.hasOption(DiskBalancer.REPORT));
+    verifyCommandOptions(DiskBalancer.REPORT, cmd);
+    readClusterInfo(cmd);
+
+    final String nodeFormat =
+        "%d/%d %s[%s:%d] - <%s>: %d volumes with node data density %.2f.";
+    final String nodeFormatWithoutSequence =
+        "%s[%s:%d] - <%s>: %d volumes with node data density %.2f.";
+    final String volumeFormat =
+        "[%s: volume-%s] - %.2f used: %d/%d, %.2f free: %d/%d, "
+        + "isFailed: %s, isReadOnly: %s, isSkip: %s, isTransient: %s.";
+
+    if (cmd.hasOption(DiskBalancer.NODE)) {
+      /*
+       * Reporting volume information for a specific DataNode
+       */
+      handleNodeReport(cmd, result, nodeFormatWithoutSequence, volumeFormat);
+
+    } else { // handle TOP
+      /*
+       * Reporting volume information for top X DataNode(s)
+       */
+      handleTopReport(cmd, result, nodeFormat);
+    }
+
+    out.println(result.toString());
+  }
+
+  private void handleTopReport(final CommandLine cmd, final StrBuilder result,
+      final String nodeFormat) {
+    Collections.sort(getCluster().getNodes(), Collections.reverseOrder());
+
+    /* extract value that identifies top X DataNode(s) */
+    setTopNodes(parseTopNodes(cmd, result));
+
+    /*
+     * Reporting volume information of top X DataNode(s) in summary
+     */
+    final String outputLine = String.format(
+        "Reporting top %d DataNode(s) benefiting from running DiskBalancer.",
+        getTopNodes());
+    recordOutput(result, outputLine);
+
+    ListIterator<DiskBalancerDataNode> li = getCluster().getNodes()
+        .listIterator();
+
+    for (int i = 0; i < getTopNodes() && li.hasNext(); i++) {
+      DiskBalancerDataNode dbdn = li.next();
+      result.appendln(String.format(nodeFormat,
+          i+1,
+          getTopNodes(),
+          dbdn.getDataNodeName(),
+          dbdn.getDataNodeIP(),
+          dbdn.getDataNodePort(),
+          dbdn.getDataNodeUUID(),
+          dbdn.getVolumeCount(),
+          dbdn.getNodeDataDensity()));
+    }
+  }
+
+  private void handleNodeReport(final CommandLine cmd, StrBuilder result,
+      final String nodeFormat, final String volumeFormat) {
+    String outputLine = "";
+    /*
+     * get value that identifies a DataNode from command line, it could be UUID,
+     * IP address or host name.
+     */
+    final String nodeVal = cmd.getOptionValue(DiskBalancer.NODE);
+
+    if (StringUtils.isBlank(nodeVal)) {
+      outputLine = "The value for '-node' is neither specified or empty.";
+      recordOutput(result, outputLine);
+    } else {
+      /*
+       * Reporting volume information for a specific DataNode
+       */
+      outputLine = String.format(
+          "Reporting volume information for DataNode '%s'.", nodeVal);
+      recordOutput(result, outputLine);
+
+      final String trueStr = "True";
+      final String falseStr = "False";
+      DiskBalancerDataNode dbdn = getNode(nodeVal);
+
+      if (dbdn == null) {
+        outputLine = String.format(
+            "Can't find a DataNode that matches '%s'.", nodeVal);
+        recordOutput(result, outputLine);
+      } else {
+        result.appendln(String.format(nodeFormat,
+            dbdn.getDataNodeName(),
+            dbdn.getDataNodeIP(),
+            dbdn.getDataNodePort(),
+            dbdn.getDataNodeUUID(),
+            dbdn.getVolumeCount(),
+            dbdn.getNodeDataDensity()));
+
+        for (DiskBalancerVolumeSet vset : dbdn.getVolumeSets().values()) {
+          for (DiskBalancerVolume vol : vset.getVolumes()) {
+            result.appendln(String.format(volumeFormat,
+                vol.getStorageType(),
+                vol.getPath(),
+                vol.getUsedRatio(),
+                vol.getUsed(),
+                vol.getCapacity(),
+                vol.getFreeRatio(),
+                vol.getFreeSpace(),
+                vol.getCapacity(),
+                vol.isFailed() ? trueStr : falseStr,
+                vol.isReadOnly() ? trueStr : falseStr,
+                vol.isSkip() ? trueStr : falseStr,
+                vol.isTransient() ? trueStr : falseStr));
+          }
+        }
+      }
+    }
+  }
+
+  @Override
+  protected String getHelp() {
+    return "Report volume information for a specific DataNode or top X "
+        + "one(s) benefiting from running DiskBalancer, "
+        + "top defaults to " + getDefaultTop() + ". E.g.:\n"
+        + "hdfs diskbalancer -uri http://namenode.uri -report\n"
+        + "hdfs diskbalancer -uri http://namenode.uri -report -top 5\n"
+        + "hdfs diskbalancer -uri http://namenode.uri -report "
+        + "-node {DataNodeID | IP | Hostname}";
+  }
+}

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolume.java

@@ -139,6 +139,36 @@ public class DiskBalancerVolume {
     return capacity;
   }
 
+  /**
+   * Get free space of the volume.
+   *
+   * @return long
+   */
+  @JsonIgnore
+  public long getFreeSpace() {
+    return getCapacity() - getUsed();
+  }
+
+  /**
+   * Get ratio between used space and capacity.
+   *
+   * @return double
+   */
+  @JsonIgnore
+  public double getUsedRatio() {
+    return (1.0 * getUsed()) / getCapacity();
+  }
+
+  /**
+   * Get ratio between free space and capacity.
+   *
+   * @return double
+   */
+  @JsonIgnore
+  public double getFreeRatio() {
+    return (1.0 * getFreeSpace()) / getCapacity();
+  }
+
   /**
    * Sets the capacity of this volume.
    *

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DiskBalancer.java

@@ -29,12 +29,14 @@ import org.apache.hadoop.hdfs.server.diskbalancer.command.Command;
 import org.apache.hadoop.hdfs.server.diskbalancer.command.ExecuteCommand;
 import org.apache.hadoop.hdfs.server.diskbalancer.command.PlanCommand;
 import org.apache.hadoop.hdfs.server.diskbalancer.command.QueryCommand;
+import org.apache.hadoop.hdfs.server.diskbalancer.command.ReportCommand;
 import org.apache.hadoop.util.Tool;
 import org.apache.hadoop.util.ToolRunner;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
+import java.io.PrintStream;
 import java.net.URISyntaxException;
 
 /**
@@ -93,6 +95,22 @@ public class DiskBalancer extends Configured implements Tool {
    * Executes a given plan file on the target datanode.
    */
   public static final String EXECUTE = "execute";
+  /**
+   * The report command prints out a disk fragmentation report about the data
+   * cluster. By default it prints the DEFAULT_TOP machines names with high
+   * nodeDataDensity {DiskBalancerDataNode#getNodeDataDensity} values. This
+   * means that these are the nodes that deviates from the ideal data
+   * distribution.
+   */
+  public static final String REPORT = "report";
+  /**
+   * specify top number of nodes to be processed.
+   */
+  public static final String TOP = "top";
+  /**
+   * specify default top number of nodes to be processed.
+   */
+  public static final int DEFAULT_TOP = 100;
   /**
    * Name or address of the node to execute against.
    */
@@ -157,9 +175,21 @@ public class DiskBalancer extends Configured implements Tool {
    */
   @Override
   public int run(String[] args) throws Exception {
+    return run(args, System.out);
+  }
+
+  /**
+   * Execute the command with the given arguments.
+   *
+   * @param args command specific arguments.
+   * @param out the output stream used for printing
+   * @return exit code.
+   * @throws Exception
+   */
+  public int run(String[] args, final PrintStream out) throws Exception {
     Options opts = getOpts();
     CommandLine cmd = parseArgs(args, opts);
-    return dispatch(cmd, opts);
+    return dispatch(cmd, opts, out);
   }
 
   /**
@@ -173,6 +203,7 @@ public class DiskBalancer extends Configured implements Tool {
     addExecuteCommands(opts);
     addQueryCommands(opts);
     addCancelCommands(opts);
+    addReportCommands(opts);
     return opts;
   }
 
@@ -255,6 +286,26 @@ public class DiskBalancer extends Configured implements Tool {
     opt.addOption(node);
   }
 
+  /**
+   * Adds report command options.
+   * @param opt Options
+   */
+  private void addReportCommands(Options opt) {
+    Option report = new Option(REPORT, false,
+        "Report volume information of DataNode(s)"
+            + " benefiting from running DiskBalancer. "
+            + "-report [top -X] | [-node {DataNodeID | IP | Hostname}].");
+    opt.addOption(report);
+
+    Option top = new Option(TOP, true,
+        "specify the top number of nodes to be processed.");
+    opt.addOption(top);
+
+    Option node = new Option(NODE, true,
+        "Name of the datanode in the format of DataNodeID, IP or hostname.");
+    opt.addOption(node);
+  }
+
   /**
    * This function parses all command line arguments and returns the appropriate
    * values.
@@ -272,10 +323,12 @@ public class DiskBalancer extends Configured implements Tool {
    * Dispatches calls to the right command Handler classes.
    *
    * @param cmd - CommandLine
+   * @param opts options of command line
+   * @param out the output stream used for printing
    * @throws IOException
    * @throws URISyntaxException
    */
-  private int dispatch(CommandLine cmd, Options opts)
+  private int dispatch(CommandLine cmd, Options opts, final PrintStream out)
       throws IOException, URISyntaxException {
     Command currentCommand = null;
 
@@ -297,6 +350,10 @@ public class DiskBalancer extends Configured implements Tool {
         currentCommand = new CancelCommand(getConf());
       }
 
+      if (cmd.hasOption(DiskBalancer.REPORT)) {
+        currentCommand = new ReportCommand(getConf(), out);
+      }
+
       if(currentCommand == null) {
         HelpFormatter helpFormatter = new HelpFormatter();
         helpFormatter.printHelp(80, "hdfs diskbalancer -uri [args]",

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/diskbalancer/command/TestDiskBalancerCommand.java

@@ -0,0 +1,299 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with this
+ * work for additional information regarding copyright ownership.  The ASF
+ * licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p/>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p/>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+package org.apache.hadoop.hdfs.server.diskbalancer.command;
+
+import static org.hamcrest.CoreMatchers.allOf;
+import static org.hamcrest.CoreMatchers.containsString;
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertThat;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import java.net.URI;
+import java.util.List;
+import java.util.Scanner;
+
+import org.apache.commons.lang.StringUtils;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hdfs.DFSConfigKeys;
+import org.apache.hadoop.hdfs.HdfsConfiguration;
+import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.hdfs.server.diskbalancer.connectors.ClusterConnector;
+import org.apache.hadoop.hdfs.server.diskbalancer.connectors.ConnectorFactory;
+import org.apache.hadoop.hdfs.server.diskbalancer.datamodel.DiskBalancerCluster;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import com.google.common.collect.Lists;
+
+/**
+ * Tests various CLI commands of DiskBalancer.
+ */
+public class TestDiskBalancerCommand {
+  private MiniDFSCluster cluster;
+  private URI clusterJson;
+
+  @Before
+  public void setUp() throws Exception {
+    Configuration conf = new HdfsConfiguration();
+    conf.setBoolean(DFSConfigKeys.DFS_DISK_BALANCER_ENABLED, true);
+    cluster = new MiniDFSCluster.Builder(conf).numDataNodes(3)
+        .storagesPerDatanode(2).build();
+    cluster.waitActive();
+
+    clusterJson = getClass().getResource(
+        "/diskBalancer/data-cluster-64node-3disk.json").toURI();
+  }
+
+  @After
+  public void tearDown() throws Exception {
+    if (cluster != null) {
+      // Just make sure we can shutdown datanodes.
+      cluster.getDataNodes().get(0).shutdown();
+      cluster.shutdown();
+    }
+  }
+
+  private void testReportSimple() throws Exception {
+    final String cmdLine = String.format("hdfs diskbalancer -uri %s -report",
+        clusterJson.toString());
+    final List<String> outputs = runCommand(cmdLine);
+
+    assertThat(
+        outputs.get(0),
+        containsString("Processing report command"));
+    assertThat(
+        outputs.get(1),
+        is(allOf(containsString("No top limit specified"),
+            containsString("using default top value"), containsString("100"))));
+    assertThat(
+        outputs.get(2),
+        is(allOf(
+            containsString("Reporting top"),
+            containsString("64"),
+            containsString(
+                "DataNode(s) benefiting from running DiskBalancer"))));
+    assertThat(
+        outputs.get(32),
+        is(allOf(containsString("30/64 null[null:0]"),
+            containsString("a87654a9-54c7-4693-8dd9-c9c7021dc340"),
+            containsString("9 volumes with node data density 1.97"))));
+
+  }
+
+  private void testReportLessThanTotal() throws Exception {
+    final String cmdLine = String.format(
+        "hdfs diskbalancer -uri %s -report -top 32", clusterJson.toString());
+    final List<String> outputs = runCommand(cmdLine);
+
+    assertThat(
+        outputs.get(0),
+        containsString("Processing report command"));
+    assertThat(
+        outputs.get(1),
+        is(allOf(
+            containsString("Reporting top"),
+            containsString("32"),
+            containsString(
+                "DataNode(s) benefiting from running DiskBalancer"))));
+    assertThat(
+        outputs.get(31),
+        is(allOf(containsString("30/32 null[null:0]"),
+            containsString("a87654a9-54c7-4693-8dd9-c9c7021dc340"),
+            containsString("9 volumes with node data density 1.97"))));
+  }
+
+  private void testReportMoreThanTotal() throws Exception {
+    final String cmdLine = String.format(
+        "hdfs diskbalancer -uri %s -report -top 128", clusterJson.toString());
+    final List<String> outputs = runCommand(cmdLine);
+
+    assertThat(
+        outputs.get(0),
+        containsString("Processing report command"));
+    assertThat(
+        outputs.get(1),
+        is(allOf(
+            containsString("Reporting top"),
+            containsString("64"),
+            containsString(
+                "DataNode(s) benefiting from running DiskBalancer"))));
+    assertThat(
+        outputs.get(31),
+        is(allOf(containsString("30/64 null[null:0]"),
+            containsString("a87654a9-54c7-4693-8dd9-c9c7021dc340"),
+            containsString("9 volumes with node data density 1.97"))));
+
+  }
+
+  private void testReportInvalidTopLimit() throws Exception {
+    final String cmdLine = String.format(
+        "hdfs diskbalancer -uri %s -report -top xx", clusterJson.toString());
+    final List<String> outputs = runCommand(cmdLine);
+
+    assertThat(
+        outputs.get(0),
+        containsString("Processing report command"));
+    assertThat(
+        outputs.get(1),
+        is(allOf(containsString("Top limit input is not numeric"),
+            containsString("using default top value"), containsString("100"))));
+    assertThat(
+        outputs.get(2),
+        is(allOf(
+            containsString("Reporting top"),
+            containsString("64"),
+            containsString(
+                "DataNode(s) benefiting from running DiskBalancer"))));
+    assertThat(
+        outputs.get(32),
+        is(allOf(containsString("30/64 null[null:0]"),
+            containsString("a87654a9-54c7-4693-8dd9-c9c7021dc340"),
+            containsString("9 volumes with node data density 1.97"))));
+  }
+
+  private void testReportNode() throws Exception {
+    final String cmdLine = String
+        .format(
+            "hdfs diskbalancer -uri %s -report -node "
+                + "a87654a9-54c7-4693-8dd9-c9c7021dc340",
+            clusterJson.toString());
+    final List<String> outputs = runCommand(cmdLine);
+
+    assertThat(
+        outputs.get(0),
+        containsString("Processing report command"));
+    assertThat(
+        outputs.get(1),
+        is(allOf(containsString("Reporting volume information for DataNode"),
+            containsString("a87654a9-54c7-4693-8dd9-c9c7021dc340"))));
+    assertThat(
+        outputs.get(2),
+        is(allOf(containsString("null[null:0]"),
+            containsString("a87654a9-54c7-4693-8dd9-c9c7021dc340"),
+            containsString("9 volumes with node data density 1.97"))));
+    assertThat(
+        outputs.get(3),
+        is(allOf(containsString("DISK"),
+            containsString("/tmp/disk/xx3j3ph3zd"),
+            containsString("0.72 used: 289544224916/400000000000"),
+            containsString("0.28 free: 110455775084/400000000000"))));
+    assertThat(
+        outputs.get(4),
+        is(allOf(containsString("DISK"),
+            containsString("/tmp/disk/Mxfcfmb24Y"),
+            containsString("0.92 used: 733099315216/800000000000"),
+            containsString("0.08 free: 66900684784/800000000000"))));
+    assertThat(
+        outputs.get(5),
+        is(allOf(containsString("DISK"),
+            containsString("DISK"),
+            containsString("/tmp/disk/KmHefYNURo"),
+            containsString("0.20 used: 39160240782/200000000000"),
+            containsString("0.80 free: 160839759218/200000000000"))));
+    assertThat(
+        outputs.get(6),
+        is(allOf(containsString("RAM_DISK"),
+            containsString("/tmp/disk/MXRyYsCz3U"),
+            containsString("0.55 used: 438102096853/800000000000"),
+            containsString("0.45 free: 361897903147/800000000000"))));
+    assertThat(
+        outputs.get(7),
+        is(allOf(containsString("RAM_DISK"),
+            containsString("/tmp/disk/DtmAygEU6f"),
+            containsString("0.34 used: 134602910470/400000000000"),
+            containsString("0.66 free: 265397089530/400000000000"))));
+    assertThat(
+        outputs.get(8),
+        is(allOf(containsString("RAM_DISK"),
+            containsString("/tmp/disk/BoBlQFxhfw"),
+            containsString("0.60 used: 477590453390/800000000000"),
+            containsString("0.40 free: 322409546610/800000000000"))));
+    assertThat(
+        outputs.get(9),
+        is(allOf(containsString("SSD"),
+            containsString("/tmp/disk/BGe09Y77dI"),
+            containsString("0.89 used: 890446265501/1000000000000"),
+            containsString("0.11 free: 109553734499/1000000000000"))));
+    assertThat(
+        outputs.get(10),
+        is(allOf(containsString("SSD"),
+            containsString("/tmp/disk/JX3H8iHggM"),
+            containsString("0.31 used: 2782614512957/9000000000000"),
+            containsString("0.69 free: 6217385487043/9000000000000"))));
+    assertThat(
+        outputs.get(11),
+        is(allOf(containsString("SSD"),
+            containsString("/tmp/disk/uLOYmVZfWV"),
+            containsString("0.75 used: 1509592146007/2000000000000"),
+            containsString("0.25 free: 490407853993/2000000000000"))));
+  }
+
+  @Test(timeout=60000)
+  public void testReportCommmand() throws Exception {
+
+    /* test basic report */
+    testReportSimple();
+
+    /* test less than 64 DataNode(s) as total, e.g., -report -top 32 */
+    testReportLessThanTotal();
+
+    /* test more than 64 DataNode(s) as total, e.g., -report -top 128 */
+    testReportMoreThanTotal();
+
+    /* test invalid top limit, e.g., -report -top xx */
+    testReportInvalidTopLimit();
+
+    /* test -report -node DataNodeID */
+    testReportNode();
+  }
+
+  @Test
+  public void testReadClusterFromJson() throws Exception {
+    Configuration conf = new HdfsConfiguration();
+    conf.setBoolean(DFSConfigKeys.DFS_DISK_BALANCER_ENABLED, true);
+
+    ClusterConnector jsonConnector = ConnectorFactory.getCluster(clusterJson,
+        conf);
+    DiskBalancerCluster diskBalancerCluster = new DiskBalancerCluster(
+        jsonConnector);
+    diskBalancerCluster.readClusterInfo();
+    assertEquals(64, diskBalancerCluster.getNodes().size());
+  }
+
+  private List<String> runCommand(final String cmdLine) throws Exception {
+
+    String[] cmds = StringUtils.split(cmdLine, ' ');
+    Configuration conf = new HdfsConfiguration();
+    org.apache.hadoop.hdfs.tools.DiskBalancer db =
+        new org.apache.hadoop.hdfs.tools.DiskBalancer(conf);
+
+    ByteArrayOutputStream bufOut = new ByteArrayOutputStream();
+    PrintStream out = new PrintStream(bufOut);
+    db.run(cmds, out);
+
+    Scanner scanner = new Scanner(bufOut.toString());
+    List<String> outputs = Lists.newArrayList();
+    while (scanner.hasNextLine()) {
+      outputs.add(scanner.nextLine());
+    }
+    return outputs;
+  }
+}

hadoop-hdfs-project/hadoop-hdfs/src/test/resources/diskBalancer/data-cluster-64node-3disk.json

@@ -0,0 +1,9484 @@
+{
+   "exclusionList":[
+
+   ],
+   "inclusionList":[
+
+   ],
+   "nodes":[
+      {
+         "nodeDataDensity":1.4280236,
+         "volumeSets":{
+            "DISK":{
+               "volumes":[
+                  {
+                     "path":"/tmp/disk/lDbBDbMk40",
+                     "capacity":3000000000000,
+                     "storageType":"DISK",
+                     "used":2460994155387,
+                     "reserved":215232314484,
+                     "uuid":"4e893114-c28b-4b4a-8254-011bb2fb04d2",
+                     "failed":false,
+                     "volumeDataDensity":-0.033956468,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":false
+                  },
+                  {
+                     "path":"/tmp/disk/tseMsFTGAW",
+                     "capacity":7000000000000,
+                     "storageType":"DISK",
+                     "used":4912132221384,
+                     "reserved":1080424540820,
+                     "uuid":"25a81a58-ac24-44dd-ab21-bd1a95789ebc",
+                     "failed":false,
+                     "volumeDataDensity":0.019966006,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":false
+                  },
+                  {
+                     "path":"/tmp/disk/U2L8YlldVc",
+                     "capacity":600000000000,
+                     "storageType":"DISK",
+                     "used":464539264350,
+                     "reserved":81147677025,
+                     "uuid":"f39ad7e9-2dd5-495c-8e56-27f68afae5e7",
+                     "failed":false,
+                     "volumeDataDensity":-0.045543134,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":false
+                  }
+               ],
+               "storageType":"DISK",
+               "setID":"ba2f77f6-5e22-4e7b-9dd6-a9bd0a66a781",
+               "transient":false
+            },
+            "RAM_DISK":{
+               "volumes":[
+                  {
+                     "path":"/tmp/disk/JyjJn550Km",
+                     "capacity":100000000000,
+                     "storageType":"RAM_DISK",
+                     "used":88789869571,
+                     "reserved":3536734091,
+                     "uuid":"979ad2e1-eb98-47aa-93d4-ec0ac7b6585b",
+                     "failed":false,
+                     "volumeDataDensity":-0.21953386,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":true
+                  },
+                  {
+                     "path":"/tmp/disk/lllcBYVFqp",
+                     "capacity":500000000000,
+                     "storageType":"RAM_DISK",
+                     "used":112503075304,
+                     "reserved":87005858853,
+                     "uuid":"81fe7b93-cc01-49b7-94d9-e73112c12c0b",
+                     "failed":false,
+                     "volumeDataDensity":0.42851037,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":true
+                  },
+                  {
+                     "path":"/tmp/disk/Z7sx2FUNbz",
+                     "capacity":1000000000000,
+                     "storageType":"RAM_DISK",
+                     "used":811474207110,
+                     "reserved":64543764212,
+                     "uuid":"0f83d59c-b584-4023-882f-f4a49c7c3c26",
+                     "failed":false,
+                     "volumeDataDensity":-0.1665448,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":true
+                  }
+               ],
+               "storageType":"RAM_DISK",
+               "setID":"87b66d63-2e4e-4842-b56c-4eba8925b547",
+               "transient":true
+            },
+            "SSD":{
+               "volumes":[
+                  {
+                     "path":"/tmp/disk/RXmrzV9NBe",
+                     "capacity":4000000000000,
+                     "storageType":"SSD",
+                     "used":2871238941190,
+                     "reserved":433979300088,
+                     "uuid":"9dd322af-a681-4391-a9b1-1f4d6956543b",
+                     "failed":false,
+                     "volumeDataDensity":-0.23244298,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":false
+                  },
+                  {
+                     "path":"/tmp/disk/B6CXulqDoZ",
+                     "capacity":8000000000000,
+                     "storageType":"SSD",
+                     "used":2667119852903,
+                     "reserved":849827345950,
+                     "uuid":"cd877bca-e7ea-4a63-b2f5-2b05d862281b",
+                     "failed":false,
+                     "volumeDataDensity":0.19970834,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":false
+                  },
+                  {
+                     "path":"/tmp/disk/XV965gvRZy",
+                     "capacity":8000000000000,
+                     "storageType":"SSD",
+                     "used":4792424862969,
+                     "reserved":678185920093,
+                     "uuid":"06eac0f1-4762-43f9-91a2-ec2ae4c114a7",
+                     "failed":false,
+                     "volumeDataDensity":-0.08181757,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":false
+                  }
+               ],
+               "storageType":"SSD",
+               "setID":"f9aaed43-3ba3-41a3-8349-e843d337b690",
+               "transient":false
+            }
+         },
+         "dataNodeUUID":"40776825-7619-44f5-8ef3-cc78cc29f92e",
+         "dataNodeIP":null,
+         "dataNodePort":0,
+         "dataNodeName":null,
+         "volumeCount":9
+      },
+      {
+         "nodeDataDensity":2.258185,
+         "volumeSets":{
+            "DISK":{
+               "volumes":[
+                  {
+                     "path":"/tmp/disk/UdU674y4Le",
+                     "capacity":200000000000,
+                     "storageType":"DISK",
+                     "used":97341014786,
+                     "reserved":34802455330,
+                     "uuid":"dfb5269f-8b7a-4158-8900-b108c134e248",
+                     "failed":false,
+                     "volumeDataDensity":-0.26675877,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":false
+                  },
+                  {
+                     "path":"/tmp/disk/0u2JzFRe7X",
+                     "capacity":500000000000,
+                     "storageType":"DISK",
+                     "used":429153603662,
+                     "reserved":54437524292,
+                     "uuid":"658d95fb-00cc-4feb-a991-b547a366a6da",
+                     "failed":false,
+                     "volumeDataDensity":-0.6406914,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":false
+                  },
+                  {
+                     "path":"/tmp/disk/Y1COYV7NUw",
+                     "capacity":2000000000000,
+                     "storageType":"DISK",
+                     "used":293450715314,
+                     "reserved":68146575084,
+                     "uuid":"551f10dc-a93b-4eab-a754-8561d0ae08f6",
+                     "failed":false,
+                     "volumeDataDensity":0.17058018,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":false
+                  }
+               ],
+               "storageType":"DISK",
+               "setID":"b4bb6155-ac06-4285-a418-6acf77bba24e",
+               "transient":false
+            },
+            "RAM_DISK":{
+               "volumes":[
+                  {
+                     "path":"/tmp/disk/FeTegfBq9T",
+                     "capacity":600000000000,
+                     "storageType":"RAM_DISK",
+                     "used":82485249867,
+                     "reserved":40161845337,
+                     "uuid":"c3716133-679c-4ced-b144-834e54ef4b5e",
+                     "failed":false,
+                     "volumeDataDensity":0.25487903,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":true
+                  },
+                  {
+                     "path":"/tmp/disk/5MZO6UoDvc",
+                     "capacity":300000000000,
+                     "storageType":"RAM_DISK",
+                     "used":158361631495,
+                     "reserved":7613498953,
+                     "uuid":"e3478ec3-9d52-4814-8f54-526f2335215d",
+                     "failed":false,
+                     "volumeDataDensity":-0.13940075,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":true
+                  },
+                  {
+                     "path":"/tmp/disk/T0ijHlS78u",
+                     "capacity":3000000000000,
+                     "storageType":"RAM_DISK",
+                     "used":1150112429189,
+                     "reserved":393991064796,
+                     "uuid":"b4d68a48-7e47-4587-8999-89bf370d0e05",
+                     "failed":false,
+                     "volumeDataDensity":-0.039114237,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":true
+                  }
+               ],
+               "storageType":"RAM_DISK",
+               "setID":"ce9a253b-7d04-47b9-8daa-33c3012db299",
+               "transient":true
+            },
+            "SSD":{
+               "volumes":[
+                  {
+                     "path":"/tmp/disk/eOGwJDhONn",
+                     "capacity":9000000000000,
+                     "storageType":"SSD",
+                     "used":1744049587341,
+                     "reserved":621917739371,
+                     "uuid":"33dd825d-c98a-48ae-b056-4a731bf1b24c",
+                     "failed":false,
+                     "volumeDataDensity":0.043477967,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":false
+                  },
+                  {
+                     "path":"/tmp/disk/X6qlqTB6nb",
+                     "capacity":1000000000000,
+                     "storageType":"SSD",
+                     "used":341953995354,
+                     "reserved":30310644213,
+                     "uuid":"c29704ac-7056-4c2b-a6de-3cdbc3047ca0",
+                     "failed":false,
+                     "volumeDataDensity":-0.10099676,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":false
+                  },
+                  {
+                     "path":"/tmp/disk/1Vr4pzbV3G",
+                     "capacity":500000000000,
+                     "storageType":"SSD",
+                     "used":377602412191,
+                     "reserved":57807422763,
+                     "uuid":"12f1962e-9c8f-49d8-99df-6a9384a901de",
+                     "failed":false,
+                     "volumeDataDensity":-0.602286,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":false
+                  }
+               ],
+               "storageType":"SSD",
+               "setID":"fb39c3e4-6d15-481d-bbde-352fe141af33",
+               "transient":false
+            }
+         },
+         "dataNodeUUID":"ae7fb310-e968-413e-921b-d1de58e491a8",
+         "dataNodeIP":null,
+         "dataNodePort":0,
+         "dataNodeName":null,
+         "volumeCount":9
+      },
+      {
+         "nodeDataDensity":1.7007312,
+         "volumeSets":{
+            "DISK":{
+               "volumes":[
+                  {
+                     "path":"/tmp/disk/DwFdOqOaTW",
+                     "capacity":900000000000,
+                     "storageType":"DISK",
+                     "used":99168160561,
+                     "reserved":137211891116,
+                     "uuid":"c181372e-666f-4e49-87f3-9f7bbbaff1b3",
+                     "failed":false,
+                     "volumeDataDensity":0.31557345,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":false
+                  },
+                  {
+                     "path":"/tmp/disk/ljcYXTUkHS",
+                     "capacity":9000000000000,
+                     "storageType":"DISK",
+                     "used":3619972625187,
+                     "reserved":1469441796592,
+                     "uuid":"c53c8b78-0161-4e17-83ba-fd2de0be5756",
+                     "failed":false,
+                     "volumeDataDensity":-0.035123497,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":false
+                  },
+                  {
+                     "path":"/tmp/disk/5SOOyTYOVs",
+                     "capacity":100000000000,
+                     "storageType":"DISK",
+                     "used":12041899900,
+                     "reserved":19597517194,
+                     "uuid":"9c74929e-37a1-4de1-95d1-315d71a7f10b",
+                     "failed":false,
+                     "volumeDataDensity":0.29581067,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":false
+                  }
+               ],
+               "storageType":"DISK",
+               "setID":"01a1a0b3-38ad-4c25-9d40-05fe259443f3",
+               "transient":false
+            },
+            "RAM_DISK":{
+               "volumes":[
+                  {
+                     "path":"/tmp/disk/wj9qG4IhYy",
+                     "capacity":6000000000000,
+                     "storageType":"RAM_DISK",
+                     "used":1455580728735,
+                     "reserved":738605855282,
+                     "uuid":"89c662ad-3445-4845-9696-1d7e3b679bfa",
+                     "failed":false,
+                     "volumeDataDensity":-0.037234724,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":true
+                  },
+                  {
+                     "path":"/tmp/disk/e9VPWCY0PQ",
+                     "capacity":7000000000000,
+                     "storageType":"RAM_DISK",
+                     "used":2288368986641,
+                     "reserved":345518725926,
+                     "uuid":"a56a599d-dac8-4b5f-87ff-a5270331214d",
+                     "failed":false,
+                     "volumeDataDensity":-0.104465574,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":true
+                  },
+                  {
+                     "path":"/tmp/disk/r6FmT6DaSi",
+                     "capacity":8000000000000,
+                     "storageType":"RAM_DISK",
+                     "used":857858924121,
+                     "reserved":695088410600,
+                     "uuid":"026ed3bd-4c6f-4e93-896a-745399ea6380",
+                     "failed":false,
+                     "volumeDataDensity":0.121982425,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":true
+                  }
+               ],
+               "storageType":"RAM_DISK",
+               "setID":"9df73bb6-30d8-4a9a-809a-eb270ac8a1b7",
+               "transient":true
+            },
+            "SSD":{
+               "volumes":[
+                  {
+                     "path":"/tmp/disk/swJswpkvRs",
+                     "capacity":7000000000000,
+                     "storageType":"SSD",
+                     "used":588291065076,
+                     "reserved":242685800023,
+                     "uuid":"5f2ad8e0-1a72-4216-b319-7f91ddf1c3e6",
+                     "failed":false,
+                     "volumeDataDensity":0.20023128,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":false
+                  },
+                  {
+                     "path":"/tmp/disk/KhBiEleI9E",
+                     "capacity":300000000000,
+                     "storageType":"SSD",
+                     "used":102256062721,
+                     "reserved":10811440676,
+                     "uuid":"95a71fc2-0082-477c-a6e9-0abd22e960f3",
+                     "failed":false,
+                     "volumeDataDensity":-0.06630537,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":false
+                  },
+                  {
+                     "path":"/tmp/disk/Gc5FHFaeN3",
+                     "capacity":3000000000000,
+                     "storageType":"SSD",
+                     "used":2065149709238,
+                     "reserved":454502820734,
+                     "uuid":"f9883090-a0a6-4043-898b-d34e8ae5be47",
+                     "failed":false,
+                     "volumeDataDensity":-0.5240041,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":false
+                  }
+               ],
+               "storageType":"SSD",
+               "setID":"34fa1fc5-c171-48e6-8051-8db2f426ba7b",
+               "transient":false
+            }
+         },
+         "dataNodeUUID":"a2f2b5f2-1d7d-453f-827c-fd7029bec3d1",
+         "dataNodeIP":null,
+         "dataNodePort":0,
+         "dataNodeName":null,
+         "volumeCount":9
+      },
+      {
+         "nodeDataDensity":1.7328286,
+         "volumeSets":{
+            "DISK":{
+               "volumes":[
+                  {
+                     "path":"/tmp/disk/uFDeIR28Nh",
+                     "capacity":5000000000000,
+                     "storageType":"DISK",
+                     "used":2658190506687,
+                     "reserved":656855219905,
+                     "uuid":"99c42086-cc16-4a58-8a1f-245317af0be5",
+                     "failed":false,
+                     "volumeDataDensity":0.07108402,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":false
+                  },
+                  {
+                     "path":"/tmp/disk/8Fgier51ru",
+                     "capacity":300000000000,
+                     "storageType":"DISK",
+                     "used":227897747788,
+                     "reserved":468068973,
+                     "uuid":"ba715c9a-5c48-4491-9bff-a229dbeb43c8",
+                     "failed":false,
+                     "volumeDataDensity":-0.07771945,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":false
+                  },
+                  {
+                     "path":"/tmp/disk/ra98HSUe4y",
+                     "capacity":1000000000000,
+                     "storageType":"DISK",
+                     "used":957364784699,
+                     "reserved":16410806207,
+                     "uuid":"a4b3b9d5-5f57-4975-aaf2-5f6fabd04cd2",
+                     "failed":false,
+                     "volumeDataDensity":-0.2902112,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":false
+                  }
+               ],
+               "storageType":"DISK",
+               "setID":"bd40e4ed-3dcc-4e4e-b6b0-2e36119338da",
+               "transient":false
+            },
+            "RAM_DISK":{
+               "volumes":[
+                  {
+                     "path":"/tmp/disk/6IvCbQyBe2",
+                     "capacity":300000000000,
+                     "storageType":"RAM_DISK",
+                     "used":172904840421,
+                     "reserved":39039216509,
+                     "uuid":"d79d570d-3156-4053-a411-8aaf01a92f36",
+                     "failed":false,
+                     "volumeDataDensity":-0.4951154,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":true
+                  },
+                  {
+                     "path":"/tmp/disk/gkBUhdkmDJ",
+                     "capacity":800000000000,
+                     "storageType":"RAM_DISK",
+                     "used":9731949053,
+                     "reserved":41360556778,
+                     "uuid":"80ee07d6-a620-42b9-b771-a8f304b7b6e5",
+                     "failed":false,
+                     "volumeDataDensity":0.15462668,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":true
+                  },
+                  {
+                     "path":"/tmp/disk/aU4fkiT0ca",
+                     "capacity":100000000000,
+                     "storageType":"RAM_DISK",
+                     "used":4658882988,
+                     "reserved":1115597025,
+                     "uuid":"7ecc9a71-a479-47e8-8b02-a525edd0ada3",
+                     "failed":false,
+                     "volumeDataDensity":0.1203404,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":true
+                  }
+               ],
+               "storageType":"RAM_DISK",
+               "setID":"924f689d-29a6-4e4a-9ba8-b3264bbb4a82",
+               "transient":true
+            },
+            "SSD":{
+               "volumes":[
+                  {
+                     "path":"/tmp/disk/3CUBl1Djia",
+                     "capacity":9000000000000,
+                     "storageType":"SSD",
+                     "used":4573882347156,
+                     "reserved":581462411054,
+                     "uuid":"9dc04655-dc29-476d-a4cd-4b8dbcd3ca9f",
+                     "failed":false,
+                     "volumeDataDensity":0.030687451,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":false
+                  },
+                  {
+                     "path":"/tmp/disk/qrCDyQSXj6",
+                     "capacity":100000000000,
+                     "storageType":"SSD",
+                     "used":57576879899,
+                     "reserved":19127812291,
+                     "uuid":"e1a70eb5-5406-49ba-ae31-62a4862cc96d",
+                     "failed":false,
+                     "volumeDataDensity":-0.13795084,
+                     "skip":false,
+                     "readOnly":false,
+                     "transient":false
+                  },
+                  {
+                     "path":"/tmp/disk/h7ntGGMWFB",
+                     "capacity":700000000000,
+                     "storageType":"SSD",
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