Add way to skip determine partitions for index task

Add a way to skip determinePartitions for IndexTask by manually
specifying numShards.

indexing-hadoop/src/main/java/io/druid/indexer/DetermineHashedPartitionsJob.java

@@ -179,7 +179,16 @@ public class DetermineHashedPartitionsJob implements Jobby
             actualSpecs.add(new HadoopyShardSpec(new NoneShardSpec(), shardCount++));
           } else {
             for (int i = 0; i < numberOfShards; ++i) {
-              actualSpecs.add(new HadoopyShardSpec(new HashBasedNumberedShardSpec(i, numberOfShards), shardCount++));
+              actualSpecs.add(
+                  new HadoopyShardSpec(
+                      new HashBasedNumberedShardSpec(
+                          i,
+                          numberOfShards,
+                          HadoopDruidIndexerConfig.jsonMapper
+                      ),
+                      shardCount++
+                  )
+              );
               log.info("DateTime[%s], partition[%d], spec[%s]", bucket, i, actualSpecs.get(i));
             }
           }

indexing-hadoop/src/main/java/io/druid/indexer/HadoopDruidDetermineConfigurationJob.java

@@ -67,7 +67,7 @@ public class HadoopDruidDetermineConfigurationJob implements Jobby
           for (int i = 0; i < shardsPerInterval; i++) {
             specs.add(
                 new HadoopyShardSpec(
-                    new HashBasedNumberedShardSpec(i, shardsPerInterval),
+                    new HashBasedNumberedShardSpec(i, shardsPerInterval, HadoopDruidIndexerConfig.jsonMapper),
                     shardCount++
                 )
             );

indexing-service/src/main/java/io/druid/indexing/common/task/IndexTask.java

@@ -19,10 +19,13 @@
 
 package io.druid.indexing.common.task;
 
+import com.fasterxml.jackson.annotation.JacksonInject;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.google.common.base.Preconditions;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.Iterables;
 import com.google.common.collect.Lists;
@@ -53,12 +56,14 @@ import io.druid.segment.loading.DataSegmentPusher;
 import io.druid.segment.realtime.FireDepartmentMetrics;
 import io.druid.segment.realtime.plumber.Plumber;
 import io.druid.timeline.DataSegment;
+import io.druid.timeline.partition.HashBasedNumberedShardSpec;
 import io.druid.timeline.partition.NoneShardSpec;
 import io.druid.timeline.partition.ShardSpec;
 import io.druid.timeline.partition.SingleDimensionShardSpec;
 import org.joda.time.DateTime;
 import org.joda.time.Interval;
 
+import javax.annotation.Nullable;
 import java.io.File;
 import java.io.IOException;
 import java.util.List;
@@ -107,6 +112,8 @@ public class IndexTask extends AbstractFixedIntervalTask
   @JsonIgnore
   private final IndexIngestionSpec ingestionSchema;
 
+  private final ObjectMapper jsonMapper;
+
   @JsonCreator
   public IndexTask(
       @JsonProperty("id") String id,
@@ -118,7 +125,8 @@ public class IndexTask extends AbstractFixedIntervalTask
       @JsonProperty("indexGranularity") final QueryGranularity indexGranularity,
       @JsonProperty("targetPartitionSize") final int targetPartitionSize,
       @JsonProperty("firehose") final FirehoseFactory firehoseFactory,
-      @JsonProperty("rowFlushBoundary") final int rowFlushBoundary
+      @JsonProperty("rowFlushBoundary") final int rowFlushBoundary,
+      @JacksonInject ObjectMapper jsonMapper
   )
   {
     super(
@@ -139,9 +147,10 @@ public class IndexTask extends AbstractFixedIntervalTask
               granularitySpec.withQueryGranularity(indexGranularity == null ? QueryGranularity.NONE : indexGranularity)
           ),
           new IndexIOConfig(firehoseFactory),
-          new IndexTuningConfig(targetPartitionSize, rowFlushBoundary)
+          new IndexTuningConfig(targetPartitionSize, rowFlushBoundary, null)
       );
     }
+    this.jsonMapper = jsonMapper;
   }
 
   @Override
@@ -175,7 +184,15 @@ public class IndexTask extends AbstractFixedIntervalTask
       if (targetPartitionSize > 0) {
         shardSpecs = determinePartitions(bucket, targetPartitionSize);
       } else {
-        shardSpecs = ImmutableList.<ShardSpec>of(new NoneShardSpec());
+        int numShards = ingestionSchema.getTuningConfig().getNumShards();
+        if (numShards > 0) {
+          shardSpecs = Lists.newArrayList();
+          for (int i = 0; i < numShards; i++) {
+            shardSpecs.add(new HashBasedNumberedShardSpec(i, numShards, jsonMapper));
+          }
+        } else {
+          shardSpecs = ImmutableList.<ShardSpec>of(new NoneShardSpec());
+        }
       }
       for (final ShardSpec shardSpec : shardSpecs) {
         final DataSegment segment = generateSegment(
@@ -206,6 +223,7 @@ public class IndexTask extends AbstractFixedIntervalTask
         retVal.add(interval);
       }
     }
+
     return retVal;
   }
 
@@ -477,7 +495,7 @@ public class IndexTask extends AbstractFixedIntervalTask
 
       this.dataSchema = dataSchema;
       this.ioConfig = ioConfig;
-      this.tuningConfig = tuningConfig == null ? new IndexTuningConfig(0, 0) : tuningConfig;
+      this.tuningConfig = tuningConfig == null ? new IndexTuningConfig(0, 0, null) : tuningConfig;
     }
 
     @Override
@@ -530,15 +548,22 @@ public class IndexTask extends AbstractFixedIntervalTask
 
     private final int targetPartitionSize;
     private final int rowFlushBoundary;
+    private final int numShards;
 
     @JsonCreator
     public IndexTuningConfig(
         @JsonProperty("targetPartitionSize") int targetPartitionSize,
-        @JsonProperty("rowFlushBoundary") int rowFlushBoundary
-    )
+        @JsonProperty("rowFlushBoundary") int rowFlushBoundary,
+        @JsonProperty("numShards") @Nullable Integer numShards
+        )
     {
       this.targetPartitionSize = targetPartitionSize == 0 ? DEFAULT_TARGET_PARTITION_SIZE : targetPartitionSize;
       this.rowFlushBoundary = rowFlushBoundary == 0 ? DEFAULT_ROW_FLUSH_BOUNDARY : rowFlushBoundary;
+      this.numShards = numShards == null ? -1 : numShards;
+      Preconditions.checkArgument(
+          this.targetPartitionSize == -1 || this.numShards == -1,
+          "targetPartitionsSize and shardCount both cannot be set"
+      );
     }
 
     @JsonProperty
@@ -552,5 +577,11 @@ public class IndexTask extends AbstractFixedIntervalTask
     {
       return rowFlushBoundary;
     }
+
+    @JsonProperty
+    public int getNumShards()
+    {
+      return numShards;
+    }
   }
 }

indexing-service/src/test/java/io/druid/indexing/common/task/TaskSerdeTest.java

@@ -19,6 +19,8 @@
 
 package io.druid.indexing.common.task;
 
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+import com.fasterxml.jackson.databind.InjectableValues;
 import com.fasterxml.jackson.databind.Module;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.google.common.collect.ImmutableList;
@@ -67,16 +69,19 @@ public class TaskSerdeTest
         QueryGranularity.NONE,
         10000,
         new LocalFirehoseFactory(new File("lol"), "rofl", null),
-        -1
+        -1,
+        jsonMapper
     );
 
     for (final Module jacksonModule : new FirehoseModule().getJacksonModules()) {
       jsonMapper.registerModule(jacksonModule);
     }
+    InjectableValues inject = new InjectableValues.Std()
+        .addValue(ObjectMapper.class, jsonMapper);
     final String json = jsonMapper.writeValueAsString(task);
 
     Thread.sleep(100); // Just want to run the clock a bit to make sure the task id doesn't change
-    final IndexTask task2 = (IndexTask) jsonMapper.readValue(json, Task.class);
+    final IndexTask task2 = jsonMapper.reader(Task.class).with(inject).readValue(json);
 
     Assert.assertEquals("foo", task.getDataSource());
     Assert.assertEquals(new Interval("2010-01-01/P2D"), task.getInterval());

indexing-service/src/test/java/io/druid/indexing/overlord/TaskLifecycleTest.java

@@ -43,6 +43,7 @@ import io.druid.data.input.InputRow;
 import io.druid.data.input.MapBasedInputRow;
 import io.druid.data.input.impl.InputRowParser;
 import io.druid.granularity.QueryGranularity;
+import io.druid.indexing.common.TestUtils;
 import io.druid.segment.column.ColumnConfig;
 import io.druid.segment.indexing.granularity.UniformGranularitySpec;
 import io.druid.indexing.common.SegmentLoaderFactory;
@@ -249,7 +250,8 @@ public class TaskLifecycleTest
                 IR("2010-01-02T01", "a", "c", 1)
             )
         ),
-        -1
+        -1,
+        TestUtils.MAPPER
     );
 
     final Optional<TaskStatus> preRunTaskStatus = tsqa.getStatus(indexTask.getId());
@@ -297,7 +299,8 @@ public class TaskLifecycleTest
         QueryGranularity.NONE,
         10000,
         newMockExceptionalFirehoseFactory(),
-        -1
+        -1,
+        TestUtils.MAPPER
     );
 
     final TaskStatus status = runTask(indexTask);

server/src/main/java/io/druid/timeline/partition/HashBasedNumberedShardSpec.java

@@ -34,18 +34,18 @@ import java.util.List;
 
 public class HashBasedNumberedShardSpec extends NumberedShardSpec
 {
-
   private static final HashFunction hashFunction = Hashing.murmur3_32();
-  @JacksonInject
-  private ObjectMapper jsonMapper;
+  private final ObjectMapper jsonMapper;
 
   @JsonCreator
   public HashBasedNumberedShardSpec(
       @JsonProperty("partitionNum") int partitionNum,
-      @JsonProperty("partitions") int partitions
+      @JsonProperty("partitions") int partitions,
+      @JacksonInject ObjectMapper jsonMapper
   )
   {
     super(partitionNum, partitions);
+    this.jsonMapper = jsonMapper;
   }
 
   @Override

server/src/test/java/io/druid/server/shard/HashBasedNumberedShardSpecTest.java

@@ -26,6 +26,7 @@ import com.metamx.common.ISE;
 import io.druid.TestUtil;
 import io.druid.data.input.InputRow;
 import io.druid.data.input.Row;
+import io.druid.jackson.DefaultObjectMapper;
 import io.druid.timeline.partition.HashBasedNumberedShardSpec;
 import io.druid.timeline.partition.PartitionChunk;
 import io.druid.timeline.partition.ShardSpec;
@@ -43,7 +44,7 @@ public class HashBasedNumberedShardSpecTest
   {
 
     final ShardSpec spec = TestUtil.MAPPER.readValue(
-        TestUtil.MAPPER.writeValueAsBytes(new HashBasedNumberedShardSpec(1, 2)),
+        TestUtil.MAPPER.writeValueAsBytes(new HashBasedNumberedShardSpec(1, 2, TestUtil.MAPPER)),
         ShardSpec.class
     );
     Assert.assertEquals(1, spec.getPartitionNum());
@@ -65,9 +66,9 @@ public class HashBasedNumberedShardSpecTest
   public void testPartitionChunks()
   {
     final List<ShardSpec> specs = ImmutableList.<ShardSpec>of(
-        new HashBasedNumberedShardSpec(0, 3),
-        new HashBasedNumberedShardSpec(1, 3),
-        new HashBasedNumberedShardSpec(2, 3)
+        new HashBasedNumberedShardSpec(0, 3, TestUtil.MAPPER),
+        new HashBasedNumberedShardSpec(1, 3, TestUtil.MAPPER),
+        new HashBasedNumberedShardSpec(2, 3, TestUtil.MAPPER)
     );
 
     final List<PartitionChunk<String>> chunks = Lists.transform(
@@ -141,7 +142,7 @@ public class HashBasedNumberedShardSpecTest
         int partitions
     )
     {
-      super(partitionNum, partitions);
+      super(partitionNum, partitions, TestUtil.MAPPER);
     }
 
     @Override