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https://issues.apache.org/jira/browse/PIG-5310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16267896#comment-16267896
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Satish Subhashrao Saley edited comment on PIG-5310 at 11/28/17 7:53 PM:
------------------------------------------------------------------------
Fixed the test case.
The test case earlier was not throwing exception without the fix because I was
not loading key as integer. By default it was DataByteArray.
was (Author: satishsaley):
Fixed the test case.
> MergeJoin throwing NullPointer Exception
> ----------------------------------------
>
> Key: PIG-5310
> URL: https://issues.apache.org/jira/browse/PIG-5310
> Project: Pig
> Issue Type: Bug
> Reporter: Satish Subhashrao Saley
> Assignee: Satish Subhashrao Saley
> Attachments: PIG-5310-1.patch, PIG-5310-2.patch
>
>
> Merge join throws NullPointerException if left input's first key doesn't
> exist in right input and if it is smaller than first key of right input.
> For ex
> |left|right|
> |1|3|
> |1|5|
> |1| |
> Error we get -
> {code}
> ERROR 2998: Unhandled internal error. Vertex failed, vertexName=scope-16,
> vertexId=vertex_1509400259446_0001_1_02, diagnostics=[Task failed,
> taskId=task_1509400259446_0001_1_02_000000, diagnostics=[TaskAttempt 0
> failed, info=[Error: Error while running task ( failure ) :
> attempt_1509400259446_0001_1_02_000000_0:java.lang.NullPointerException
> at java.lang.Integer.compareTo(Integer.java:1216)
> at java.lang.Integer.compareTo(Integer.java:52)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POMergeJoin.getNextTuple(POMergeJoin.java:525)
> at
> org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:305)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.plan.operator.POStoreTez.getNextTuple(POStoreTez.java:123)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.runtime.PigProcessor.runPipeline(PigProcessor.java:416)
> at
> org.apache.pig.backend.hadoop.executionengine.tez.runtime.PigProcessor.run(PigProcessor.java:281)
> at
> org.apache.tez.runtime.LogicalIOProcessorRuntimeTask.run(LogicalIOProcessorRuntimeTask.java:370)
> at
> org.apache.tez.runtime.task.TaskRunner2Callable$1.run(TaskRunner2Callable.java:73)
> at
> org.apache.tez.runtime.task.TaskRunner2Callable$1.run(TaskRunner2Callable.java:61)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1945)
> at
> org.apache.tez.runtime.task.TaskRunner2Callable.callInternal(TaskRunner2Callable.java:61)
> at
> org.apache.tez.runtime.task.TaskRunner2Callable.callInternal(TaskRunner2Callable.java:37)
> at org.apache.tez.common.CallableWithNdc.call(CallableWithNdc.java:36)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> {code}
> Here, the key used in join is an integer. Integer.compareTo(other) method
> throws null pointer exception if comparison is made against null.
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