diff --git a/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/CacheTran.java b/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/CacheTran.java
new file mode 100644
index 0000000..5ec27ec
--- /dev/null
+++ b/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/CacheTran.java
@@ -0,0 +1,54 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.hive.ql.exec.spark;
+
+import org.apache.hadoop.io.WritableComparable;
+import org.apache.spark.api.java.JavaPairRDD;
+import org.apache.spark.storage.StorageLevel;
+
+public abstract class CacheTran
+ implements SparkTran {
+ // whether to cache current RDD.
+ private boolean caching = false;
+ private JavaPairRDD cachedRDD;
+
+ protected CacheTran(boolean cache) {
+ this.caching = cache;
+ }
+
+ @Override
+ public JavaPairRDD transform(
+ JavaPairRDD input) {
+ if (caching) {
+ if (cachedRDD == null) {
+ cachedRDD = doTransform(input);
+ cachedRDD.persist(StorageLevel.MEMORY_AND_DISK());
+ }
+ return cachedRDD;
+ } else {
+ return doTransform(input);
+ }
+ }
+
+ public Boolean isCacheEnable() {
+ return caching;
+ }
+
+ protected abstract JavaPairRDD doTransform(JavaPairRDD input);
+}
diff --git a/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/MapTran.java b/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/MapTran.java
index 2170243..2a18991 100644
--- a/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/MapTran.java
+++ b/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/MapTran.java
@@ -22,12 +22,20 @@
import org.apache.hadoop.io.BytesWritable;
import org.apache.spark.api.java.JavaPairRDD;
-public class MapTran implements SparkTran {
+public class MapTran extends CacheTran {
private HiveMapFunction mapFunc;
private String name = "MapTran";
+ public MapTran() {
+ this(false);
+ }
+
+ public MapTran(boolean cache) {
+ super(cache);
+ }
+
@Override
- public JavaPairRDD transform(
+ public JavaPairRDD doTransform(
JavaPairRDD input) {
return input.mapPartitionsToPair(mapFunc);
}
@@ -42,11 +50,6 @@ public String getName() {
}
@Override
- public Boolean isCacheEnable() {
- return null;
- }
-
- @Override
public void setName(String name) {
this.name = name;
}
diff --git a/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/ReduceTran.java b/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/ReduceTran.java
index e60dfac..3d56876 100644
--- a/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/ReduceTran.java
+++ b/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/ReduceTran.java
@@ -22,12 +22,20 @@
import org.apache.hadoop.io.BytesWritable;
import org.apache.spark.api.java.JavaPairRDD;
-public class ReduceTran implements SparkTran, HiveKey, BytesWritable> {
+public class ReduceTran extends CacheTran, HiveKey, BytesWritable> {
private HiveReduceFunction reduceFunc;
private String name = "Reduce";
+ public ReduceTran() {
+ this(false);
+ }
+
+ public ReduceTran(boolean caching) {
+ super(caching);
+ }
+
@Override
- public JavaPairRDD transform(
+ public JavaPairRDD doTransform(
JavaPairRDD> input) {
return input.mapPartitionsToPair(reduceFunc);
}
@@ -42,11 +50,6 @@ public String getName() {
}
@Override
- public Boolean isCacheEnable() {
- return null;
- }
-
- @Override
public void setName(String name) {
this.name = name;
}
diff --git a/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/SparkPlan.java b/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/SparkPlan.java
index ee5c78a..762f734 100644
--- a/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/SparkPlan.java
+++ b/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/SparkPlan.java
@@ -88,6 +88,9 @@
}
perfLogger.PerfLogEnd(CLASS_NAME, PerfLogger.SPARK_BUILD_RDD_GRAPH);
+ if (LOG.isDebugEnabled()) {
+ LOG.info("print generated spark rdd graph:\n" + SparkUtilities.rddGraphToString(finalRDD));
+ }
return finalRDD;
}
diff --git a/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/SparkPlanGenerator.java b/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/SparkPlanGenerator.java
index 3f240f5..3a1eff8 100644
--- a/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/SparkPlanGenerator.java
+++ b/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/SparkPlanGenerator.java
@@ -102,7 +102,7 @@ public SparkPlan generate(SparkWork sparkWork) throws Exception {
try {
for (BaseWork work : sparkWork.getAllWork()) {
perfLogger.PerfLogBegin(CLASS_NAME, PerfLogger.SPARK_CREATE_TRAN + work.getName());
- SparkTran tran = generate(work);
+ SparkTran tran = generate(work, sparkWork);
SparkTran parentTran = generateParentTran(sparkPlan, sparkWork, work);
sparkPlan.addTran(tran);
sparkPlan.connect(parentTran, tran);
@@ -206,18 +206,19 @@ private ShuffleTran generate(SparkPlan sparkPlan, SparkEdgeProperty edge, boolea
return new ShuffleTran(sparkPlan, shuffler, edge.getNumPartitions(), toCache);
}
- private SparkTran generate(BaseWork work) throws Exception {
+ private SparkTran generate(BaseWork work, SparkWork sparkWork) throws Exception {
initStatsPublisher(work);
JobConf newJobConf = cloneJobConf(work);
checkSpecs(work, newJobConf);
byte[] confBytes = KryoSerializer.serializeJobConf(newJobConf);
+ boolean caching = isCachingWork(work, sparkWork);
if (work instanceof MapWork) {
- MapTran mapTran = new MapTran();
+ MapTran mapTran = new MapTran(caching);
HiveMapFunction mapFunc = new HiveMapFunction(confBytes, sparkReporter);
mapTran.setMapFunction(mapFunc);
return mapTran;
} else if (work instanceof ReduceWork) {
- ReduceTran reduceTran = new ReduceTran();
+ ReduceTran reduceTran = new ReduceTran(caching);
HiveReduceFunction reduceFunc = new HiveReduceFunction(confBytes, sparkReporter);
reduceTran.setReduceFunction(reduceFunc);
return reduceTran;
@@ -227,6 +228,22 @@ private SparkTran generate(BaseWork work) throws Exception {
}
}
+ private boolean isCachingWork(BaseWork work, SparkWork sparkWork) {
+ boolean caching = true;
+ List children = sparkWork.getChildren(work);
+ if (children.size() < 2) {
+ caching = false;
+ } else {
+ // do not cache this if its child RDD is intend to be cached.
+ for (BaseWork child : children) {
+ if (cloneToWork.containsKey(child)) {
+ caching = false;
+ }
+ }
+ }
+ return caching;
+ }
+
private void checkSpecs(BaseWork work, JobConf jc) throws Exception {
Set> opList = work.getAllOperators();
for (Operator> op : opList) {
diff --git a/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/SparkUtilities.java b/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/SparkUtilities.java
index e6c845c..ca0ffb6 100644
--- a/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/SparkUtilities.java
+++ b/ql/src/java/org/apache/hadoop/hive/ql/exec/spark/SparkUtilities.java
@@ -21,6 +21,7 @@
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
+import java.util.Collection;
import java.util.UUID;
import org.apache.commons.io.FilenameUtils;
@@ -34,7 +35,12 @@
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.session.SessionState;
import org.apache.hadoop.io.BytesWritable;
+import org.apache.spark.Dependency;
import org.apache.spark.SparkConf;
+import org.apache.spark.api.java.JavaPairRDD;
+import org.apache.spark.rdd.RDD;
+import org.apache.spark.rdd.UnionRDD;
+import scala.collection.JavaConversions;
/**
* Contains utilities methods used as part of Spark tasks.
@@ -122,4 +128,34 @@ public static SparkSession getSparkSession(HiveConf conf,
SessionState.get().setSparkSession(sparkSession);
return sparkSession;
}
+
+
+ public static String rddGraphToString(JavaPairRDD rdd) {
+ StringBuilder sb = new StringBuilder();
+ rddToString(rdd.rdd(), sb, "");
+ return sb.toString();
+ }
+
+ private static void rddToString(RDD rdd, StringBuilder sb, String offset) {
+ sb.append(offset).append(rdd.getClass().getCanonicalName()).append("[").append(rdd.hashCode()).append("]");
+ if (rdd.getStorageLevel().useMemory()) {
+ sb.append("(cached)");
+ }
+ sb.append("\n");
+ Collection dependencies = JavaConversions.asJavaCollection(rdd.dependencies());
+ if (dependencies != null) {
+ offset += "\t";
+ for (Dependency dependency : dependencies) {
+ RDD parentRdd = dependency.rdd();
+ rddToString(parentRdd, sb, offset);
+ }
+ } else if (rdd instanceof UnionRDD) {
+ UnionRDD unionRDD = (UnionRDD) rdd;
+ offset += "\t";
+ Collection parentRdds = JavaConversions.asJavaCollection(unionRDD.rdds());
+ for (RDD parentRdd : parentRdds) {
+ rddToString(parentRdd, sb, offset);
+ }
+ }
+ }
}