Fixed equal distribution strategy when exist disabled middleManagers.

indexing-service/src/main/java/io/druid/indexing/overlord/setup/EqualDistributionWorkerSelectStrategy.java

@@ -47,7 +47,17 @@ public int compare(
               ImmutableZkWorker zkWorker, ImmutableZkWorker zkWorker2
           )
           {
-            return -Ints.compare(zkWorker2.getCurrCapacityUsed(), zkWorker.getCurrCapacityUsed());
+            int retVal = -Ints.compare(zkWorker2.getCurrCapacityUsed(), zkWorker.getCurrCapacityUsed());
+            // the version sorting is needed because if the workers have the same currCapacityUsed only one of them is
+            // returned. Exists the possibility that this worker is disabled and doesn't have valid version so can't
+            // run new tasks, so in this case the workers are sorted using version to ensure that if exists enable
+            // workers the comparator return one of them.
+
+            if(retVal == 0) {
+              retVal = zkWorker2.getWorker().getVersion().compareTo(zkWorker.getWorker().getVersion());
+            }
+
+            return retVal;
           }
         }
     );

indexing-service/src/main/java/io/druid/indexing/overlord/setup/FillCapacityWorkerSelectStrategy.java

@@ -50,8 +50,13 @@ public int compare(
           )
           {
             int retVal = Ints.compare(zkWorker2.getCurrCapacityUsed(), zkWorker.getCurrCapacityUsed());
+            // the version sorting is needed because if the workers have the same currCapacityUsed only one of them is
+            // returned. Exists the possibility that this worker is disabled and doesn't have valid version so can't
+            // run new tasks, so in this case the workers are sorted using version to ensure that if exists enable
+            // workers the comparator return one of them.
+
             if (retVal == 0) {
-              retVal = zkWorker.getWorker().getHost().compareTo(zkWorker2.getWorker().getHost());
+              retVal = zkWorker.getWorker().getVersion().compareTo(zkWorker2.getWorker().getVersion());
             }
 
             return retVal;

indexing-service/src/test/java/io/druid/indexing/overlord/setup/EqualDistributionWorkerSelectStrategyTest.java

@@ -63,4 +63,70 @@ public String getDataSource()
     ImmutableZkWorker worker = optional.get();
     Assert.assertEquals("lhost", worker.getWorker().getHost());
   }
+
+  @Test
+  public void testOneDisableWorkerDifferentUsedCapacity() throws Exception
+  {
+    String DISABLED_VERSION = "";
+    final EqualDistributionWorkerSelectStrategy strategy = new EqualDistributionWorkerSelectStrategy();
+
+    Optional<ImmutableZkWorker> optional = strategy.findWorkerForTask(
+        new RemoteTaskRunnerConfig(),
+        ImmutableMap.of(
+                      "lhost",
+                      new ImmutableZkWorker(
+                              new Worker("disableHost", "disableHost", 10, DISABLED_VERSION), 2,
+                              Sets.<String>newHashSet()
+                      ),
+                      "localhost",
+                      new ImmutableZkWorker(
+                              new Worker("enableHost", "enableHost", 10, "v1"), 5,
+                              Sets.<String>newHashSet()
+                      )
+        ),
+        new NoopTask(null, 1, 0, null, null, null)
+        {
+          @Override
+          public String getDataSource()
+                  {
+                      return "foo";
+                  }
+        }
+    );
+    ImmutableZkWorker worker = optional.get();
+    Assert.assertEquals("enableHost", worker.getWorker().getHost());
+  }
+
+  @Test
+  public void testOneDisableWorkerSameUsedCapacity() throws Exception
+  {
+    String DISABLED_VERSION = "";
+    final EqualDistributionWorkerSelectStrategy strategy = new EqualDistributionWorkerSelectStrategy();
+
+    Optional<ImmutableZkWorker> optional = strategy.findWorkerForTask(
+            new RemoteTaskRunnerConfig(),
+            ImmutableMap.of(
+                    "lhost",
+                    new ImmutableZkWorker(
+                            new Worker("disableHost", "disableHost", 10, DISABLED_VERSION), 5,
+                            Sets.<String>newHashSet()
+                    ),
+                    "localhost",
+                    new ImmutableZkWorker(
+                            new Worker("enableHost", "enableHost", 10, "v1"), 5,
+                            Sets.<String>newHashSet()
+                    )
+            ),
+            new NoopTask(null, 1, 0, null, null, null)
+            {
+                @Override
+                public String getDataSource()
+                {
+                    return "foo";
+                }
+            }
+    );
+    ImmutableZkWorker worker = optional.get();
+    Assert.assertEquals("enableHost", worker.getWorker().getHost());
+  }
 }