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https://issues.apache.org/jira/browse/PIG-4936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15354411#comment-15354411
]
liyunzhang_intel commented on PIG-4936:
---------------------------------------
[~kexianda]:
{quote}
I'm just curious about what change cause failure.
is it cause by the change in Partitioner.scala?
git diff v1.6.1 v1.4.1 ./core/src/main/scala/org/apache/spark/Partitioner.scala
{quote}
[BypassMergeSortShuffleWriter|https://github.com/apache/spark/blob/8028a28885dbd90f20e38922240618fc310a0a65/core/src/main/java/org/apache/spark/shuffle/sort/BypassMergeSortShuffleWriter.java]
is imported after spark 1.4.1 and in spark 1.4.1, the call stack is
{code}
org.apache.spark.scheduler.ShuffleMapTask#runTask
->org.apache.spark.shuffle.sort.SortShuffleManager#getWriter
->org.apache.spark.shuffle.sort.SortShuffleWriter#write
{code}
in spark 1.6.1
{code}
org.apache.spark.scheduler.ShuffleMapTask#runTask
->org.apache.spark.shuffle.sort.SortShuffleManager#getWriter
->org.apache.spark.shuffle.sort.BypassMergeSortShuffleWriter#write
->org.apache.pig.test.utils.SimpleCustomPartitioner#getPartition
{code}
The difference between these two version is that in 1.6.1
SortShuffleManager#getWriter returns BypassMergeSortShuffleWriter and
SimpleCustomPartitioner#getPartition is called in
sort.BypassMergeSortShuffleWriter#write while in 1.4.1
SortShuffleManager#getWriter returns SortShuffleWriter and
impleCustomPartitioner#getPartition is not called in SortShuffleWriter#write.
> Fix NPE exception in TestCustomPartitioner#testCustomPartitionerParseJoins
> --------------------------------------------------------------------------
>
> Key: PIG-4936
> URL: https://issues.apache.org/jira/browse/PIG-4936
> Project: Pig
> Issue Type: Bug
> Reporter: liyunzhang_intel
> Assignee: liyunzhang_intel
> Attachments: PIG-4936.patch
>
>
> After PIG-4919(upgrade spark to 1.6.1 version),
> TestCustomPartitioner#TestCustomPartitioner fails.
> {code}
> Testcase: testCustomPartitionerParseJoins took 1.66 sec
> Caused an ERROR
> Unable to open iterator for alias hash. Backend error : Job aborted due to
> stage failure: Task 0 in stage 2.0 failed 1 times, most recent failure: Lost
> task 0.0 in stage 2.0 (TID 3, localhost): java.lang.RuntimeException:
> java.lang.reflect.InvocationTargetException
> at
> org.apache.pig.backend.hadoop.executionengine.spark.MapReducePartitionerWrapper.getPartition(MapReducePartitionerWrapper.java:118)
> at
> org.apache.spark.shuffle.sort.BypassMergeSortShuffleWriter.write(BypassMergeSortShuffleWriter.java:151)
> 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$TaskRunner.run(Executor.scala:214)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:744)
> Caused by: java.lang.reflect.InvocationTargetException
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at
> org.apache.pig.backend.hadoop.executionengine.spark.MapReducePartitionerWrapper.getPartition(MapReducePartitionerWrapper.java:110)
> ... 8 more
> Caused by: java.lang.NullPointerException
> at
> org.apache.pig.impl.io.PigNullableWritable.hashCode(PigNullableWritable.java:185)
> at
> org.apache.pig.test.utils.SimpleCustomPartitioner.getPartition(SimpleCustomPartitioner.java:33)
> ... 13 more
> {code}
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