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https://issues.apache.org/jira/browse/HIVE-12557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15035076#comment-15035076
 ] 

Prasanth Jayachandran commented on HIVE-12557:
----------------------------------------------

Somehow precondition didn't hit my head. It will be better to have 
preconditions check instead of defensively catching NPE.

> NPE while removing entry in LRFU cache
> --------------------------------------
>
>                 Key: HIVE-12557
>                 URL: https://issues.apache.org/jira/browse/HIVE-12557
>             Project: Hive
>          Issue Type: Bug
>          Components: llap
>            Reporter: Siddharth Seth
>            Assignee: Sergey Shelukhin
>         Attachments: HIVE-12557.patch
>
>
> {code}
> Error while processing statement: FAILED: Execution Error, return code 2 from 
> org.apache.hadoop.hive.ql.exec.tez.TezTask. Vertex failed, vertexName=Map 6, 
> vertexId=vertex_1448429572030_1851_5_00, diagnostics=[Task failed, 
> taskId=task_1448429572030_1851_5_00_000006, diagnostics=[TaskAttempt 0 
> failed, info=[Error: Failure while running task: 
> attempt_1448429572030_1851_5_00_000006_0:java.lang.RuntimeException: 
> org.apache.hadoop.hive.ql.metadata.HiveException: java.io.IOException: 
> java.io.IOException: java.lang.NullPointerException
>         at 
> org.apache.hadoop.hive.ql.exec.tez.TezProcessor.initializeAndRunProcessor(TezProcessor.java:195)
>         at 
> org.apache.hadoop.hive.ql.exec.tez.TezProcessor.run(TezProcessor.java:160)
>         at 
> org.apache.tez.runtime.LogicalIOProcessorRuntimeTask.run(LogicalIOProcessorRuntimeTask.java:348)
>         at 
> org.apache.tez.runtime.task.TaskRunner2Callable$1.run(TaskRunner2Callable.java:71)
>         at 
> org.apache.tez.runtime.task.TaskRunner2Callable$1.run(TaskRunner2Callable.java:60)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at javax.security.auth.Subject.doAs(Subject.java:422)
>         at 
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
>         at 
> org.apache.tez.runtime.task.TaskRunner2Callable.callInternal(TaskRunner2Callable.java:60)
>         at 
> org.apache.tez.runtime.task.TaskRunner2Callable.callInternal(TaskRunner2Callable.java:35)
>         at org.apache.tez.common.CallableWithNdc.call(CallableWithNdc.java:36)
>         at java.util.concurrent.FutureTask.run(FutureTask.java:266)
>         at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>         at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>         at java.lang.Thread.run(Thread.java:745)
> Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: 
> java.io.IOException: java.io.IOException: java.lang.NullPointerException
>         at 
> org.apache.hadoop.hive.ql.exec.tez.MapRecordSource.pushRecord(MapRecordSource.java:74)
>         at 
> org.apache.hadoop.hive.ql.exec.tez.MapRecordProcessor.run(MapRecordProcessor.java:352)
>         at 
> org.apache.hadoop.hive.ql.exec.tez.TezProcessor.initializeAndRunProcessor(TezProcessor.java:172)
>         ... 14 more
> Caused by: java.io.IOException: java.io.IOException: 
> java.lang.NullPointerException
>         at 
> org.apache.hadoop.hive.io.HiveIOExceptionHandlerChain.handleRecordReaderNextException(HiveIOExceptionHandlerChain.java:121)
>         at 
> org.apache.hadoop.hive.io.HiveIOExceptionHandlerUtil.handleRecordReaderNextException(HiveIOExceptionHandlerUtil.java:77)
>         at 
> org.apache.hadoop.hive.ql.io.HiveContextAwareRecordReader.doNext(HiveContextAwareRecordReader.java:355)
>         at 
> org.apache.hadoop.hive.ql.io.HiveRecordReader.doNext(HiveRecordReader.java:79)
>         at 
> org.apache.hadoop.hive.ql.io.HiveRecordReader.doNext(HiveRecordReader.java:33)
>         at 
> org.apache.hadoop.hive.ql.io.HiveContextAwareRecordReader.next(HiveContextAwareRecordReader.java:116)
>         at 
> org.apache.hadoop.mapred.split.TezGroupedSplitsInputFormat$TezGroupedSplitsRecordReader.next(TezGroupedSplitsInputFormat.java:151)
>         at 
> org.apache.tez.mapreduce.lib.MRReaderMapred.next(MRReaderMapred.java:116)
>         at 
> org.apache.hadoop.hive.ql.exec.tez.MapRecordSource.pushRecord(MapRecordSource.java:62)
>         ... 16 more
> Caused by: java.io.IOException: java.lang.NullPointerException
>         at 
> org.apache.hadoop.hive.llap.io.api.impl.LlapInputFormat$LlapRecordReader.rethrowErrorIfAny(LlapInputFormat.java:283)
>         at 
> org.apache.hadoop.hive.llap.io.api.impl.LlapInputFormat$LlapRecordReader.nextCvb(LlapInputFormat.java:239)
>         at 
> org.apache.hadoop.hive.llap.io.api.impl.LlapInputFormat$LlapRecordReader.next(LlapInputFormat.java:167)
>         at 
> org.apache.hadoop.hive.llap.io.api.impl.LlapInputFormat$LlapRecordReader.next(LlapInputFormat.java:103)
>         at 
> org.apache.hadoop.hive.ql.io.HiveContextAwareRecordReader.doNext(HiveContextAwareRecordReader.java:350)
>         ... 22 more
> Caused by: java.lang.NullPointerException
>         at 
> org.apache.hadoop.hive.llap.cache.LowLevelLrfuCachePolicy.removeFromListUnderLock(LowLevelLrfuCachePolicy.java:351)
>         at 
> org.apache.hadoop.hive.llap.cache.LowLevelLrfuCachePolicy.removeFromListAndUnlock(LowLevelLrfuCachePolicy.java:336)
>         at 
> org.apache.hadoop.hive.llap.cache.LowLevelLrfuCachePolicy.notifyUnlock(LowLevelLrfuCachePolicy.java:133)
>         at 
> org.apache.hadoop.hive.llap.cache.LowLevelCacheImpl.unlockBuffer(LowLevelCacheImpl.java:354)
>         at 
> org.apache.hadoop.hive.llap.cache.LowLevelCacheImpl.releaseBuffer(LowLevelCacheImpl.java:338)
>         at 
> org.apache.hadoop.hive.llap.io.encoded.OrcEncodedDataReader$DataWrapperForOrc.releaseBuffer(OrcEncodedDataReader.java:922)
>         at 
> org.apache.hadoop.hive.ql.io.orc.encoded.EncodedReaderImpl.releaseInitialRefcounts(EncodedReaderImpl.java:453)
>         at 
> org.apache.hadoop.hive.ql.io.orc.encoded.EncodedReaderImpl.readEncodedColumns(EncodedReaderImpl.java:416)
>         at 
> org.apache.hadoop.hive.llap.io.encoded.OrcEncodedDataReader.performDataRead(OrcEncodedDataReader.java:413)
>         at 
> org.apache.hadoop.hive.llap.io.encoded.OrcEncodedDataReader$4.run(OrcEncodedDataReader.java:194)
>         at 
> org.apache.hadoop.hive.llap.io.encoded.OrcEncodedDataReader$4.run(OrcEncodedDataReader.java:191)
>         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:1657)
>         at 
> org.apache.hadoop.hive.llap.io.encoded.OrcEncodedDataReader.callInternal(OrcEncodedDataReader.java:191)
>         at 
> org.apache.hadoop.hive.llap.io.encoded.OrcEncodedDataReader.callInternal(OrcEncodedDataReader.java:74)
>         ... 5 more
> {code}



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