rename persistBackgroundCount to numBackgroundPersistThreads

docs/content/ingestion/batch-ingestion.md

@@ -207,7 +207,7 @@ The tuningConfig is optional and default parameters will be used if no tuningCon
 |useCombiner|Boolean|Use hadoop combiner to merge rows at mapper if possible.|no (default == false)|
 |jobProperties|Object|a map of properties to add to the Hadoop job configuration.|no (default == null)|
 |buildV9Directly|Boolean|Whether to build v9 index directly instead of building v8 index and convert it to v9 format|no (default = false)|
-|persistBackgroundCount|Integer|The number of new background threads to use for incremental persists. Using this feature causes a notable increase in memory pressure and cpu usage, but will make the job finish more quickly. If changing from the default of 0 (use current thread for persists), we recommend setting it to 1.|no (default == 0)|
+|numBackgroundPersistThreads|Integer|The number of new background threads to use for incremental persists. Using this feature causes a notable increase in memory pressure and cpu usage, but will make the job finish more quickly. If changing from the default of 0 (use current thread for persists), we recommend setting it to 1.|no (default == 0)|
 
 ### Partitioning specification
 

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

@@ -44,7 +44,7 @@ public class HadoopTuningConfig implements TuningConfig
   private static final int DEFAULT_ROW_FLUSH_BOUNDARY = 80000;
   private static final boolean DEFAULT_USE_COMBINER = false;
   private static final Boolean DEFAULT_BUILD_V9_DIRECTLY = Boolean.FALSE;
-  private static final int DEFAULT_PERSIST_BACKGROUND_COUNT = 0;
+  private static final int DEFAULT_NUM_BACKGROUND_PERSIST_THREADS = 0;
 
   public static HadoopTuningConfig makeDefaultTuningConfig()
   {
@@ -64,7 +64,7 @@ public static HadoopTuningConfig makeDefaultTuningConfig()
         false,
         null,
         DEFAULT_BUILD_V9_DIRECTLY,
-        DEFAULT_PERSIST_BACKGROUND_COUNT
+        DEFAULT_NUM_BACKGROUND_PERSIST_THREADS
     );
   }
 
@@ -82,7 +82,7 @@ public static HadoopTuningConfig makeDefaultTuningConfig()
   private final boolean combineText;
   private final boolean useCombiner;
   private final Boolean buildV9Directly;
-  private final int persistBackgroundCount;
+  private final int numBackgroundPersistThreads;
 
   @JsonCreator
   public HadoopTuningConfig(
@@ -102,7 +102,7 @@ public HadoopTuningConfig(
       // See https://github.com/druid-io/druid/pull/1922
       final @JsonProperty("rowFlushBoundary") Integer maxRowsInMemoryCOMPAT,
       final @JsonProperty("buildV9Directly") Boolean buildV9Directly,
-      final @JsonProperty("persistBackgroundCount") Integer persistBackgroundCount
+      final @JsonProperty("numBackgroundPersistThreads") Integer numBackgroundPersistThreads
   )
   {
     this.workingPath = workingPath;
@@ -121,8 +121,8 @@ public HadoopTuningConfig(
     this.combineText = combineText;
     this.useCombiner = useCombiner == null ? DEFAULT_USE_COMBINER : useCombiner.booleanValue();
     this.buildV9Directly = buildV9Directly == null ? DEFAULT_BUILD_V9_DIRECTLY : buildV9Directly;
-    this.persistBackgroundCount = persistBackgroundCount == null ? DEFAULT_PERSIST_BACKGROUND_COUNT : persistBackgroundCount;
-    Preconditions.checkArgument(this.persistBackgroundCount >= 0, "Not support persistBackgroundCount < 0");
+    this.numBackgroundPersistThreads = numBackgroundPersistThreads == null ? DEFAULT_NUM_BACKGROUND_PERSIST_THREADS : numBackgroundPersistThreads;
+    Preconditions.checkArgument(this.numBackgroundPersistThreads >= 0, "Not support persistBackgroundCount < 0");
   }
 
   @JsonProperty
@@ -209,9 +209,9 @@ public Boolean getBuildV9Directly() {
   }
 
   @JsonProperty
-  public int getPersistBackgroundCount()
+  public int getNumBackgroundPersistThreads()
   {
-    return persistBackgroundCount;
+    return numBackgroundPersistThreads;
   }
 
   public HadoopTuningConfig withWorkingPath(String path)
@@ -232,7 +232,7 @@ public HadoopTuningConfig withWorkingPath(String path)
         useCombiner,
         null,
         buildV9Directly,
-        persistBackgroundCount
+        numBackgroundPersistThreads
     );
   }
 
@@ -254,7 +254,7 @@ public HadoopTuningConfig withVersion(String ver)
         useCombiner,
         null,
         buildV9Directly,
-        persistBackgroundCount
+        numBackgroundPersistThreads
     );
   }
 
@@ -276,7 +276,7 @@ public HadoopTuningConfig withShardSpecs(Map<DateTime, List<HadoopyShardSpec>> s
         useCombiner,
         null,
         buildV9Directly,
-        persistBackgroundCount
+        numBackgroundPersistThreads
     );
   }
 }

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

@@ -567,12 +567,12 @@ protected void reduce(
 
         Set<String> allDimensionNames = Sets.newLinkedHashSet();
         final ProgressIndicator progressIndicator = makeProgressIndicator(context);
-        int persistBackgroundCount = config.getSchema().getTuningConfig().getPersistBackgroundCount();
-        if (persistBackgroundCount > 0) {
+        int numBackgroundPersistThreads = config.getSchema().getTuningConfig().getNumBackgroundPersistThreads();
+        if (numBackgroundPersistThreads > 0) {
           final BlockingQueue<Runnable> queue = new SynchronousQueue<>();
           ExecutorService executorService = new ThreadPoolExecutor(
-              persistBackgroundCount,
-              persistBackgroundCount,
+              numBackgroundPersistThreads,
+              numBackgroundPersistThreads,
               0L,
               TimeUnit.MILLISECONDS,
               queue,

indexing-hadoop/src/test/java/io/druid/indexer/HadoopTuningConfigTest.java

@@ -73,7 +73,7 @@ public void testSerde() throws Exception
     Assert.assertEquals(ImmutableMap.<String, String>of(), actual.getJobProperties());
     Assert.assertEquals(true, actual.isCombineText());
     Assert.assertEquals(true, actual.getUseCombiner());
-    Assert.assertEquals(0, actual.getPersistBackgroundCount());
+    Assert.assertEquals(0, actual.getNumBackgroundPersistThreads());
 
   }