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https://issues.apache.org/jira/browse/HIVE-15580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15829154#comment-15829154
]
Dapeng Sun commented on HIVE-15580:
-----------------------------------
Thank [~xuefuz], [~csun] and [~Ferd], we are running a 100TB test case about
data skew on 50 nodes(TPC-xBB q21), before the patch, spark tasks are failed
with following error:
{noformat}
java.lang.OutOfMemoryError: Requested array size exceeds VM limit
at java.util.Arrays.copyOf(Arrays.java:3181)
at java.util.ArrayList.grow(ArrayList.java:261)
at java.util.ArrayList.ensureExplicitCapacity(ArrayList.java:235)
at java.util.ArrayList.ensureCapacityInternal(ArrayList.java:227)
at java.util.ArrayList.add(ArrayList.java:458)
at
org.apache.hadoop.hive.ql.exec.spark.SortByShuffler$ShuffleFunction$1.next(SortByShuffler.java:100)
at
org.apache.hadoop.hive.ql.exec.spark.SortByShuffler$ShuffleFunction$1.next(SortByShuffler.java:75)
at
org.apache.hadoop.hive.ql.exec.spark.HiveBaseFunctionResultList$ResultIterator.hasNext(HiveBaseFunctionResultList.java:95)
at
scala.collection.convert.Wrappers$JIteratorWrapper.hasNext(Wrappers.scala:41)
at
org.apache.spark.util.collection.ExternalSorter.insertAll(ExternalSorter.scala:200)
at
org.apache.spark.shuffle.sort.SortShuffleWriter.write(SortShuffleWriter.scala:64)
at
org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:73)
at
org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:41)
at org.apache.spark.scheduler.Task.run(Task.scala:89)
at
org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:214)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
{noformat}
after apply the patch, the arraylist are fixed, but PartitionedPairBuffer also
cause OOM, here are the task failed exception:
{noformat}
java.lang.OutOfMemoryError: Requested array size exceeds VM limit
at
org.apache.spark.util.collection.PartitionedPairBuffer.growArray(PartitionedPairBuffer.scala:67)
at
org.apache.spark.util.collection.PartitionedPairBuffer.insert(PartitionedPairBuffer.scala:48)
at
org.apache.spark.util.collection.ExternalSorter.insertAll(ExternalSorter.scala:203)
at
org.apache.spark.shuffle.BlockStoreShuffleReader.read(BlockStoreShuffleReader.scala:111)
at org.apache.spark.rdd.ShuffledRDD.compute(ShuffledRDD.scala:98)
at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:306)
at org.apache.spark.rdd.RDD.iterator(RDD.scala:270)
at
org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:306)
at org.apache.spark.rdd.RDD.iterator(RDD.scala:270)
at
org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:306)
at org.apache.spark.rdd.RDD.iterator(RDD.scala:270)
at
org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:73)
at
org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:41)
at org.apache.spark.scheduler.Task.run(Task.scala:89)
at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:214)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
{noformat}
> Replace Spark's groupByKey operator with something with bounded memory
> ----------------------------------------------------------------------
>
> Key: HIVE-15580
> URL: https://issues.apache.org/jira/browse/HIVE-15580
> Project: Hive
> Issue Type: Improvement
> Components: Spark
> Reporter: Xuefu Zhang
> Assignee: Xuefu Zhang
> Attachments: HIVE-15580.1.patch, HIVE-15580.1.patch,
> HIVE-15580.2.patch, HIVE-15580.2.patch, HIVE-15580.3.patch, HIVE-15580.patch
>
>
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