HDFS-5835. Add a new option for starting Namenode when rolling upgrade is in progress.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-5535@1561943 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/CHANGES_HDFS-5535.txt

@@ -10,5 +10,8 @@ HDFS-5535 subtasks:
 
     HDFS-5786. Support QUERY and FINALIZE actions of rolling upgrade. (szetszwo)
 
-    HDFS-5753. Add new NN startup options for downgrade and rollback using
+    HDFS-5753. Add new Namenode startup options for downgrade and rollback using
     upgrade marker. (szetszwo)
+
+    HDFS-5835. Add a new option for starting Namenode when rolling upgrade is
+    in progress. (szetszwo)

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/RollingUpgradeInfo.java

@@ -58,7 +58,25 @@ public class RollingUpgradeInfo {
   public long getFinalizeTime() {
     return finalizeTime;
   }
-  
+
+  @Override
+  public int hashCode() {
+    //only use lower 32 bits
+    return (int)startTime ^ (int)finalizeTime;
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (obj == this) {
+      return true;
+    } else if (obj == null || !(obj instanceof RollingUpgradeInfo)) {
+      return false;
+    }
+    final RollingUpgradeInfo that = (RollingUpgradeInfo)obj;
+    return this.startTime == that.startTime
+        && this.finalizeTime == that.finalizeTime;
+  }
+
   @Override
   public String toString() {
     return "     Start Time: " + (startTime == 0? "<NOT STARTED>": timestamp2String(startTime))

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/HdfsServerConstants.java

@@ -47,7 +47,7 @@ public final class HdfsServerConstants {
 
   /** Startup options for rolling upgrade. */
   public static enum RollingUpgradeStartupOption{
-    ROLLBACK, DOWNGRADE;
+    ROLLBACK, DOWNGRADE, STARTED;
     
     private static final RollingUpgradeStartupOption[] VALUES = values();
 

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSEditLogLoader.java

@@ -79,6 +79,7 @@ import org.apache.hadoop.hdfs.server.namenode.FSEditLogOp.SymlinkOp;
 import org.apache.hadoop.hdfs.server.namenode.FSEditLogOp.TimesOp;
 import org.apache.hadoop.hdfs.server.namenode.FSEditLogOp.UpdateBlocksOp;
 import org.apache.hadoop.hdfs.server.namenode.FSEditLogOp.UpdateMasterKeyOp;
+import org.apache.hadoop.hdfs.server.namenode.FSEditLogOp.UpgradeMarkerOp;
 import org.apache.hadoop.hdfs.server.namenode.FSEditLogOp.UpgradeMarkerOp.UpgradeMarkerException;
 import org.apache.hadoop.hdfs.server.namenode.INode.BlocksMapUpdateInfo;
 import org.apache.hadoop.hdfs.server.namenode.LeaseManager.Lease;
@@ -677,6 +678,12 @@ public class FSEditLogLoader {
             == RollingUpgradeStartupOption.DOWNGRADE) {
           //ignore upgrade marker
           break;
+        } else if (startOpt.getRollingUpgradeStartupOption()
+            == RollingUpgradeStartupOption.STARTED) {
+          //rolling upgrade is already started, set info
+          final UpgradeMarkerOp upgradeOp = (UpgradeMarkerOp)op; 
+          fsNamesys.setRollingUpgradeInfo(upgradeOp.getStartTime());
+          break;
         }
       }
       throw new RollingUpgradeException(

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSEditLogOp.java

@@ -3398,6 +3398,10 @@ public abstract class FSEditLogOp {
       return (UpgradeMarkerOp) cache.get(OP_UPGRADE_MARKER);
     }
 
+    long getStartTime() {
+      return startTime;
+    }
+
     void setStartTime(long startTime) {
       this.startTime = startTime;
     }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java

@@ -7110,7 +7110,7 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
       final CheckpointSignature cs = getFSImage().rollEditLog();
       LOG.info("Successfully rolled edit log for preparing rolling upgrade."
           + " Checkpoint signature: " + cs);
-      rollingUpgradeInfo = new RollingUpgradeInfo(now());
+      setRollingUpgradeInfo(now());
       getEditLog().logUpgradeMarker(rollingUpgradeInfo.getStartTime());
     } finally {
       writeUnlock();
@@ -7123,6 +7123,10 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
     return rollingUpgradeInfo;
   }
 
+  void setRollingUpgradeInfo(long startTime) {
+    rollingUpgradeInfo = new RollingUpgradeInfo(startTime);;
+  }
+
   RollingUpgradeInfo finalizeRollingUpgrade() throws IOException {
     checkSuperuserPrivilege();
     checkOperation(OperationCategory.WRITE);

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/MiniDFSCluster.java

@@ -914,6 +914,10 @@ public class MiniDFSCluster {
   }
   
   private static String[] createArgs(StartupOption operation) {
+    if (operation == StartupOption.ROLLINGUPGRADE) {
+      return new String[]{operation.getName(),
+          operation.getRollingUpgradeStartupOption().name()};
+    }
     String[] args = (operation == null ||
         operation == StartupOption.FORMAT ||
         operation == StartupOption.REGULAR) ?

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestRollingUpgrade.java

@@ -17,8 +17,18 @@
  */
 package org.apache.hadoop.hdfs;
 
+import java.io.File;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.FileUtil;
 import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hdfs.protocol.HdfsConstants.RollingUpgradeAction;
+import org.apache.hadoop.hdfs.protocol.RollingUpgradeInfo;
+import org.apache.hadoop.hdfs.qjournal.MiniJournalCluster;
+import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.StartupOption;
 import org.apache.hadoop.hdfs.tools.DFSAdmin;
 import org.junit.Assert;
 import org.junit.Test;
@@ -28,6 +38,12 @@ import org.junit.Test;
  * This class tests rolling upgrade.
  */
 public class TestRollingUpgrade {
+  private static final Log LOG = LogFactory.getLog(TestRollingUpgrade.class);
+
+  private void runCmd(DFSAdmin dfsadmin, String... args) throws Exception {
+    Assert.assertEquals(0, dfsadmin.run(args));
+  }
+
   /**
    * Test DFSAdmin Upgrade Command.
    */
@@ -55,39 +71,23 @@ public class TestRollingUpgrade {
           Assert.assertTrue(dfsadmin.run(args) != 0);
         }
 
-        {
-          //query rolling upgrade
-          final String[] args = {"-rollingUpgrade"};
-          Assert.assertEquals(0, dfsadmin.run(args));
-        }
+        //query rolling upgrade
+        runCmd(dfsadmin, "-rollingUpgrade");
 
-        {
-          //start rolling upgrade
-          final String[] args = {"-rollingUpgrade", "start"};
-          Assert.assertEquals(0, dfsadmin.run(args));
-        }
+        //start rolling upgrade
+        runCmd(dfsadmin, "-rollingUpgrade", "start");
 
-        {
-          //query rolling upgrade
-          final String[] args = {"-rollingUpgrade", "query"};
-          Assert.assertEquals(0, dfsadmin.run(args));
-        }
+        //query rolling upgrade
+        runCmd(dfsadmin, "-rollingUpgrade", "query");
 
         dfs.mkdirs(bar);
         
-        {
-          //finalize rolling upgrade
-          final String[] args = {"-rollingUpgrade", "finalize"};
-          Assert.assertEquals(0, dfsadmin.run(args));
-        }
+        //finalize rolling upgrade
+        runCmd(dfsadmin, "-rollingUpgrade", "finalize");
 
         dfs.mkdirs(baz);
 
-        {
-          //query rolling upgrade
-          final String[] args = {"-rollingUpgrade"};
-          Assert.assertEquals(0, dfsadmin.run(args));
-        }
+        runCmd(dfsadmin, "-rollingUpgrade");
 
         Assert.assertTrue(dfs.exists(foo));
         Assert.assertTrue(dfs.exists(bar));
@@ -105,4 +105,94 @@ public class TestRollingUpgrade {
       if(cluster != null) cluster.shutdown();
     }
   }
+
+  private static Configuration setConf(Configuration conf, File dir,
+      MiniJournalCluster mjc) {
+    conf.set(DFSConfigKeys.DFS_NAMENODE_NAME_DIR_KEY, dir.getAbsolutePath());
+    conf.set(DFSConfigKeys.DFS_NAMENODE_EDITS_DIR_KEY,
+        mjc.getQuorumJournalURI("myjournal").toString());
+    return conf;
+  }
+
+  @Test (timeout = 30000)
+  public void testRollingUpgradeWithQJM() throws Exception {
+    String nnDirPrefix = MiniDFSCluster.getBaseDirectory() + "/nn/";
+    final File nn1Dir = new File(nnDirPrefix + "image1");
+    final File nn2Dir = new File(nnDirPrefix + "image2");
+    
+    final Configuration conf = new HdfsConfiguration();
+    final MiniJournalCluster mjc = new MiniJournalCluster.Builder(conf).build();
+    setConf(conf, nn1Dir, mjc);
+
+    {
+      // Start the cluster once to generate the dfs dirs
+      final MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
+        .numDataNodes(0)
+        .manageNameDfsDirs(false)
+        .checkExitOnShutdown(false)
+        .build();
+      // Shutdown the cluster before making a copy of the namenode dir to release
+      // all file locks, otherwise, the copy will fail on some platforms.
+      cluster.shutdown();
+    }
+
+    MiniDFSCluster cluster2 = null;
+    try {
+      // Start a second NN pointed to the same quorum.
+      // We need to copy the image dir from the first NN -- or else
+      // the new NN will just be rejected because of Namespace mismatch.
+      FileUtil.fullyDelete(nn2Dir);
+      FileUtil.copy(nn1Dir, FileSystem.getLocal(conf).getRaw(),
+          new Path(nn2Dir.getAbsolutePath()), false, conf);
+
+      // Start the cluster again
+      final MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf)
+        .numDataNodes(0)
+        .format(false)
+        .manageNameDfsDirs(false)
+        .checkExitOnShutdown(false)
+        .build();
+
+      final Path foo = new Path("/foo");
+      final Path bar = new Path("/bar");
+
+      final RollingUpgradeInfo info1;
+      {
+        final DistributedFileSystem dfs = cluster.getFileSystem(); 
+        dfs.mkdirs(foo);
+  
+        //start rolling upgrade
+        info1 = dfs.rollingUpgrade(RollingUpgradeAction.START);
+        LOG.info("start " + info1);
+
+        //query rolling upgrade
+        Assert.assertEquals(info1, dfs.rollingUpgrade(RollingUpgradeAction.QUERY));
+  
+        dfs.mkdirs(bar);
+      }
+
+      // cluster2 takes over QJM
+      final Configuration conf2 = setConf(new Configuration(), nn2Dir, mjc);
+      //set startup option to downgrade for ignoring upgrade marker in editlog
+      StartupOption.ROLLINGUPGRADE.setRollingUpgradeStartupOption("started");
+      cluster2 = new MiniDFSCluster.Builder(conf2)
+        .numDataNodes(0)
+        .format(false)
+        .manageNameDfsDirs(false)
+        .startupOption(StartupOption.ROLLINGUPGRADE)
+        .build();
+      final DistributedFileSystem dfs2 = cluster2.getFileSystem(); 
+      
+      // Check that cluster2 sees the edits made on cluster1
+      Assert.assertTrue(dfs2.exists(foo));
+      Assert.assertTrue(dfs2.exists(bar));
+
+      //query rolling upgrade in cluster2
+      Assert.assertEquals(info1, dfs2.rollingUpgrade(RollingUpgradeAction.QUERY));
+
+      LOG.info("finalize: " + dfs2.rollingUpgrade(RollingUpgradeAction.FINALIZE));
+    } finally {
+      if (cluster2 != null) cluster2.shutdown();
+    }
+  }
 }