HADOOP-13933. Add haadmin -getAllServiceState option to get the HA state of all the NameNodes/ResourceManagers. Contributed by Surendra Singh Lilhore.

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ha/HAAdmin.java

@@ -80,6 +80,8 @@ public abstract class HAAdmin extends Configured implements Tool {
             "--" + FORCEACTIVE + " option is used."))
     .put("-getServiceState",
         new UsageInfo("<serviceId>", "Returns the state of the service"))
+      .put("-getAllServiceState",
+          new UsageInfo(null, "Returns the state of all the services"))
     .put("-checkHealth",
         new UsageInfo("<serviceId>",
             "Requests that the service perform a health check.\n" + 
@@ -119,7 +121,11 @@ public abstract class HAAdmin extends Configured implements Tool {
       String cmd = e.getKey();
       UsageInfo usage = e.getValue();
       
-      errOut.println("    [" + cmd + " " + usage.args + "]"); 
+      if (usage.args == null) {
+        errOut.println("    [" + cmd + "]");
+      } else {
+        errOut.println("    [" + cmd + " " + usage.args + "]");
+      }
     }
     errOut.println();
     ToolRunner.printGenericCommandUsage(errOut);    
@@ -130,7 +136,11 @@ public abstract class HAAdmin extends Configured implements Tool {
     if (usage == null) {
       throw new RuntimeException("No usage for cmd " + cmd);
     }
-    errOut.println(getUsageString() + " [" + cmd + " " + usage.args + "]");
+    if (usage.args == null) {
+      errOut.println(getUsageString() + " [" + cmd + "]");
+    } else {
+      errOut.println(getUsageString() + " [" + cmd + " " + usage.args + "]");
+    }
   }
 
   private int transitionToActive(final CommandLine cmd)
@@ -455,6 +465,8 @@ public abstract class HAAdmin extends Configured implements Tool {
       return failover(cmdLine);
     } else if ("-getServiceState".equals(cmd)) {
       return getServiceState(cmdLine);
+    } else if ("-getAllServiceState".equals(cmd)) {
+      return getAllServiceState();
     } else if ("-checkHealth".equals(cmd)) {
       return checkHealth(cmdLine);
     } else if ("-help".equals(cmd)) {
@@ -465,7 +477,30 @@ public abstract class HAAdmin extends Configured implements Tool {
       throw new AssertionError("Should not get here, command: " + cmd);
     } 
   }
-  
+
+  protected int getAllServiceState() {
+    Collection<String> targetIds = getTargetIds(null);
+    if (targetIds.isEmpty()) {
+      errOut.println("Failed to get service IDs");
+      return -1;
+    }
+    for (String targetId : targetIds) {
+      HAServiceTarget target = resolveTarget(targetId);
+      String address = target.getAddress().getHostName() + ":"
+          + target.getAddress().getPort();
+      try {
+        HAServiceProtocol proto = target.getProxy(getConf(),
+            rpcTimeoutForChecks);
+        out.println(String.format("%-50s %-10s", address, proto
+            .getServiceStatus().getState()));
+      } catch (IOException e) {
+        out.println(String.format("%-50s %-10s", address,
+            "Failed to connect: " + e.getMessage()));
+      }
+    }
+    return 0;
+  }
+
   private boolean confirmForceManual() throws IOException {
      return ToolRunner.confirmPrompt(
         "You have specified the --" + FORCEMANUAL + " flag. This flag is " +
@@ -532,7 +567,11 @@ public abstract class HAAdmin extends Configured implements Tool {
       return -1;
     }
     
-    out.println(cmd + " [" + usageInfo.args + "]: " + usageInfo.help);
+    if (usageInfo.args == null) {
+      out.println(cmd + ": " + usageInfo.help);
+    } else {
+      out.println(cmd + " [" + usageInfo.args + "]: " + usageInfo.help);
+    }
     return 0;
   }
   

hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSCommands.md

@@ -486,6 +486,7 @@ Usage:
         hdfs haadmin -transitionToStandby <serviceId>
         hdfs haadmin -failover [--forcefence] [--forceactive] <serviceId> <serviceId>
         hdfs haadmin -getServiceState <serviceId>
+        hdfs haadmin -getAllServiceState
         hdfs haadmin -checkHealth <serviceId>
         hdfs haadmin -help <command>
 
@@ -495,6 +496,7 @@ Usage:
 | `-checkHealth` | check the health of the given NameNode |
 | `-failover` | initiate a failover between two NameNodes |
 | `-getServiceState` | determine whether the given NameNode is Active or Standby |
+| `-getAllServiceState` | returns the state of all the NameNodes | |
 | `-transitionToActive` | transition the state of the given NameNode to Active (Warning: No fencing is done) |
 | `-transitionToStandby` | transition the state of the given NameNode to Standby (Warning: No fencing is done) |
 | `-help` [cmd] | Displays help for the given command or all commands if none is specified. |

hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSHighAvailabilityWithNFS.md

@@ -350,6 +350,7 @@ Now that your HA NameNodes are configured and started, you will have access to s
         [-transitionToStandby <serviceId>]
         [-failover [--forcefence] [--forceactive] <serviceId> <serviceId>]
         [-getServiceState <serviceId>]
+        [-getAllServiceState]
         [-checkHealth <serviceId>]
         [-help <command>]
 
@@ -381,6 +382,11 @@ This guide describes high-level uses of each of these subcommands. For specific
     used by cron jobs or monitoring scripts which need to behave differently based
     on whether the NameNode is currently Active or Standby.
 
+*   **getAllServiceState** - returns the state of all the NameNodes
+
+    Connect to the configured NameNodes to determine the current state, print
+    either "standby" or "active" to STDOUT appropriately.
+
 *   **checkHealth** - check the health of the given NameNode
 
     Connect to the provided NameNode to check its health. The NameNode is capable

hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSHighAvailabilityWithQJM.md

@@ -399,6 +399,7 @@ Now that your HA NameNodes are configured and started, you will have access to s
         [-transitionToStandby <serviceId>]
         [-failover [--forcefence] [--forceactive] <serviceId> <serviceId>]
         [-getServiceState <serviceId>]
+        [-getAllServiceState]
         [-checkHealth <serviceId>]
         [-help <command>]
 
@@ -430,6 +431,11 @@ This guide describes high-level uses of each of these subcommands. For specific
     used by cron jobs or monitoring scripts which need to behave differently based
     on whether the NameNode is currently Active or Standby.
 
+*   **getAllServiceState** - returns the state of all the NameNodes
+
+    Connect to the configured NameNodes to determine the current state, print
+    either "standby" or "active" to STDOUT appropriately.
+
 *   **checkHealth** - check the health of the given NameNode
 
     Connect to the provided NameNode to check its health. The NameNode is capable

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/TestDFSHAAdmin.java

@@ -173,7 +173,18 @@ public class TestDFSHAAdmin {
     assertEquals(0, runTool("-help", "transitionToActive"));
     assertOutputContains("Transitions the service into Active");
   }
-  
+
+  @Test
+  public void testGetAllServiceState() throws Exception {
+    Mockito.doReturn(STANDBY_READY_RESULT).when(mockProtocol)
+        .getServiceStatus();
+    assertEquals(0, runTool("-getAllServiceState"));
+    assertOutputContains(String.format("%-50s %-10s", (HOST_A + ":" + 12345),
+        STANDBY_READY_RESULT.getState()));
+    assertOutputContains(String.format("%-50s %-10s", (HOST_B + ":" + 12345),
+        STANDBY_READY_RESULT.getState()));
+  }
+
   @Test
   public void testTransitionToActive() throws Exception {
     Mockito.doReturn(STANDBY_READY_RESULT).when(mockProtocol).getServiceStatus();

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/main/java/org/apache/hadoop/yarn/client/cli/RMAdminCLI.java

@@ -174,6 +174,10 @@ public class RMAdminCLI extends HAAdmin {
     this.errOut = errOut;
   }
 
+  protected void setOut(PrintStream out) {
+    this.out = out;
+  }
+
   private static void appendHAUsage(final StringBuilder usageBuilder) {
     for (Map.Entry<String,UsageInfo> cmdEntry : USAGE.entrySet()) {
       if (cmdEntry.getKey().equals("-help")
@@ -181,7 +185,12 @@ public class RMAdminCLI extends HAAdmin {
         continue;
       }
       UsageInfo usageInfo = cmdEntry.getValue();
-      usageBuilder.append(" [" + cmdEntry.getKey() + " " + usageInfo.args + "]");
+      if (usageInfo.args == null) {
+        usageBuilder.append(" [" + cmdEntry.getKey() + "]");
+      } else {
+        usageBuilder.append(" [" + cmdEntry.getKey() + " " + usageInfo.args
+            + "]");
+      }
     }
   }
 
@@ -193,9 +202,13 @@ public class RMAdminCLI extends HAAdmin {
         return;
       }
     }
-    String space = (usageInfo.args == "") ? "" : " ";
-    builder.append("   " + cmd + space + usageInfo.args + ": " +
-        usageInfo.help);
+    if (usageInfo.args == null) {
+      builder.append("   " + cmd + ": " + usageInfo.help);
+    } else {
+      String space = (usageInfo.args == "") ? "" : " ";
+      builder.append("   " + cmd + space + usageInfo.args + ": "
+          + usageInfo.help);
+    }
   }
 
   private static void buildIndividualUsageMsg(String cmd,
@@ -209,10 +222,13 @@ public class RMAdminCLI extends HAAdmin {
       }
       isHACommand = true;
     }
-    String space = (usageInfo.args == "") ? "" : " ";
-    builder.append("Usage: yarn rmadmin ["
-        + cmd + space + usageInfo.args
-        + "]\n");
+    if (usageInfo.args == null) {
+      builder.append("Usage: yarn rmadmin [" + cmd + "]\n");
+    } else {
+      String space = (usageInfo.args == "") ? "" : " ";
+      builder.append("Usage: yarn rmadmin [" + cmd + space + usageInfo.args
+          + "]\n");
+    }
     if (isHACommand) {
       builder.append(cmd + " can only be used when RM HA is enabled");
     }
@@ -230,7 +246,11 @@ public class RMAdminCLI extends HAAdmin {
         String cmdKey = cmdEntry.getKey();
         if (!cmdKey.equals("-help")) {
           UsageInfo usageInfo = cmdEntry.getValue();
-          builder.append("   " + cmdKey + " " + usageInfo.args + "\n");
+          if (usageInfo.args == null) {
+            builder.append("   " + cmdKey + "\n");
+          } else {
+            builder.append("   " + cmdKey + " " + usageInfo.args + "\n");
+          }
         }
       }
     }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/test/java/org/apache/hadoop/yarn/client/cli/TestRMAdminCLI.java

@@ -45,11 +45,13 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.ha.HAServiceProtocol;
 import org.apache.hadoop.ha.HAServiceStatus;
 import org.apache.hadoop.ha.HAServiceTarget;
+import org.apache.hadoop.ha.HAServiceProtocol.HAServiceState;
 import org.apache.hadoop.service.Service.STATE;
 import org.apache.hadoop.yarn.api.records.DecommissionType;
 import org.apache.hadoop.yarn.api.records.NodeId;
 import org.apache.hadoop.yarn.api.records.Resource;
 import org.apache.hadoop.yarn.api.records.ResourceOption;
+import org.apache.hadoop.yarn.conf.HAUtil;
 import org.apache.hadoop.yarn.conf.YarnConfiguration;
 import org.apache.hadoop.yarn.exceptions.YarnException;
 import org.apache.hadoop.yarn.nodelabels.CommonNodeLabelsManager;
@@ -67,13 +69,13 @@ import org.apache.hadoop.yarn.server.api.protocolrecords.RefreshServiceAclsReque
 import org.apache.hadoop.yarn.server.api.protocolrecords.RefreshSuperUserGroupsConfigurationRequest;
 import org.apache.hadoop.yarn.server.api.protocolrecords.RefreshUserToGroupsMappingsRequest;
 import org.apache.hadoop.yarn.server.api.protocolrecords.UpdateNodeResourceRequest;
-import org.apache.hadoop.yarn.util.ConverterUtils;
 import org.apache.hadoop.yarn.util.Records;
 import org.apache.hadoop.yarn.util.resource.Resources;
 import org.junit.Before;
 import org.junit.Test;
 import org.mockito.ArgumentCaptor;
 import org.mockito.ArgumentMatcher;
+import org.mockito.Mockito;
 import org.mockito.invocation.InvocationOnMock;
 import org.mockito.stubbing.Answer;
 
@@ -88,6 +90,8 @@ public class TestRMAdminCLI {
   private RMAdminCLI rmAdminCLIWithHAEnabled;
   private CommonNodeLabelsManager dummyNodeLabelsManager;
   private boolean remoteAdminServiceAccessed = false;
+  private static final String HOST_A = "1.2.3.1";
+  private static final String HOST_B = "1.2.3.2";
 
   @SuppressWarnings("static-access")
   @Before
@@ -130,6 +134,14 @@ public class TestRMAdminCLI {
     YarnConfiguration conf = new YarnConfiguration();
     conf.setBoolean(YarnConfiguration.RM_HA_ENABLED, true);
     conf.set(YarnConfiguration.RM_HA_IDS, "rm1,rm2");
+    conf.set(HAUtil.addSuffix(YarnConfiguration.RM_ADDRESS, "rm1"), HOST_A
+        + ":12345");
+    conf.set(HAUtil.addSuffix(YarnConfiguration.RM_ADMIN_ADDRESS, "rm1"),
+        HOST_A + ":12346");
+    conf.set(HAUtil.addSuffix(YarnConfiguration.RM_ADDRESS, "rm2"), HOST_B
+        + ":12345");
+    conf.set(HAUtil.addSuffix(YarnConfiguration.RM_ADMIN_ADDRESS, "rm2"),
+        HOST_B + ":12346");
     rmAdminCLIWithHAEnabled = new RMAdminCLI(conf) {
 
       @Override
@@ -140,7 +152,17 @@ public class TestRMAdminCLI {
 
       @Override
       protected HAServiceTarget resolveTarget(String rmId) {
-        return haServiceTarget;
+        HAServiceTarget target = super.resolveTarget(rmId);
+        HAServiceTarget spy = Mockito.spy(target);
+        // Override the target to return our mock protocol
+        try {
+          Mockito.doReturn(haadmin).when(spy)
+              .getProxy(Mockito.<Configuration> any(), Mockito.anyInt());
+          Mockito.doReturn(false).when(spy).isAutoFailoverEnabled();
+        } catch (IOException e) {
+          throw new AssertionError(e); // mock setup doesn't really throw
+        }
+        return spy;
       }
     };
   }
@@ -424,6 +446,24 @@ public class TestRMAdminCLI {
     verify(haadmin).getServiceStatus();
   }
 
+  @Test
+  public void testGetAllServiceState() throws Exception {
+    HAServiceStatus standbyStatus = new HAServiceStatus(
+        HAServiceState.STANDBY).setReadyToBecomeActive();
+    Mockito.doReturn(standbyStatus).when(haadmin).getServiceStatus();
+    ByteArrayOutputStream dataOut = new ByteArrayOutputStream();
+    rmAdminCLIWithHAEnabled.setOut(new PrintStream(dataOut));
+    String[] args = {"-getAllServiceState"};
+    assertEquals(0, rmAdminCLIWithHAEnabled.run(args));
+    assertTrue(dataOut.toString().contains(
+        String.format("%-50s %-10s", (HOST_A + ":" + 12346),
+            standbyStatus.getState())));
+    assertTrue(dataOut.toString().contains(
+        String.format("%-50s %-10s", (HOST_B + ":" + 12346),
+            standbyStatus.getState())));
+    rmAdminCLIWithHAEnabled.setOut(System.out);
+  }
+
   @Test(timeout = 500)
   public void testCheckHealth() throws Exception {
     String[] args = {"-checkHealth", "rm1"};
@@ -572,7 +612,8 @@ public class TestRMAdminCLI {
               + "([OvercommitTimeout]) "
               + "[-transitionToActive [--forceactive] <serviceId>] "
               + "[-transitionToStandby <serviceId>] "
-              + "[-getServiceState <serviceId>] [-checkHealth <serviceId>] [-help [cmd]]";
+              + "[-getServiceState <serviceId>] [-getAllServiceState] "
+              + "[-checkHealth <serviceId>] [-help [cmd]]";
       String actualHelpMsg = dataOut.toString();
       assertTrue(String.format("Help messages: %n " + actualHelpMsg + " %n doesn't include expected " +
           "messages: %n" + expectedHelpMsg), actualHelpMsg.contains(expectedHelpMsg

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/YarnCommands.md

@@ -230,6 +230,7 @@ Usage:
      -transitionToStandby <serviceId>
      -failover [--forcefence] [--forceactive] <serviceId> <serviceId>
      -getServiceState <serviceId>
+     -getAllServiceState
      -checkHealth <serviceId>
      -help [cmd]
 ```
@@ -254,6 +255,7 @@ Usage:
 | -transitionToStandby [--forcemanual] \<serviceId\> | Transitions the service into Standby state. This command can not be used if automatic failover is enabled. Though you can override this by --forcemanual option, you need caution. |
 | -failover [--forceactive] \<serviceId1\> \<serviceId2\> | Initiate a failover from serviceId1 to serviceId2. Try to failover to the target service even if it is not ready if the --forceactive option is used. This command can not be used if automatic failover is enabled. |
 | -getServiceState \<serviceId\> | Returns the state of the service. |
+| -getAllServiceState | Returns the state of all the services. |
 | -checkHealth \<serviceId\> | Requests that the service perform a health check. The RMAdmin tool will exit with a non-zero exit code if the check fails. |
 | -help [cmd] | Displays help for the given command or all commands if none is specified. |