[jira] [Assigned] (CARBONDATA-2991) NegativeArraySizeException during query execution

[Akash R Nilugal (Jira)]

     [ https://issues.apache.org/jira/browse/CARBONDATA-2991?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Babulal reassigned CARBONDATA-2991:
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    Assignee: Babulal

> NegativeArraySizeException during query execution
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>
>                 Key: CARBONDATA-2991
>                 URL: https://issues.apache.org/jira/browse/CARBONDATA-2991
>             Project: CarbonData
>          Issue Type: Bug
>    Affects Versions: 1.4.0, 1.3.1
>            Reporter: Babulal
>            Assignee: Babulal
>            Priority: Major
>
> During Query Execution sometime NegativeArraySizeException  Exception in Some Tasks . And sometime Executor is lost (JVM crash)
>  
> ava.lang.NegativeArraySizeException at org.apache.carbondata.core.datastore.chunk.store.impl.unsafe.UnsafeVariableLengthDimesionDataChunkStore.getRow(UnsafeVariableLengthDimesionDataChunkStore.java:157) at org.apache.carbondata.core.datastore.chunk.impl.AbstractDimensionDataChunk.getChunkData(AbstractDimensionDataChunk.java:46) at org.apache.carbondata.core.scan.result.AbstractScannedResult.getNoDictionaryKeyArray(AbstractScannedResult.java:470) at org.apache.carbondata.core.scan.result.impl.NonFilterQueryScannedResult.getNoDictionaryKeyArray(NonFilterQueryScannedResult.java:102) at org.apache.carbondata.core.scan.collector.impl.DictionaryBasedResultCollector.collectData(DictionaryBasedResultCollector.java:101) at org.apache.carbondata.core.scan.processor.impl.DataBlockIteratorImpl.next(DataBlockIteratorImpl.java:51) at org.apache.carbondata.core.scan.processor.impl.DataBlockIteratorImpl.next(DataBlockIteratorImpl.java:32) at org.apache.carbondata.core.scan.result.iterator.DetailQueryResultIterator.getBatchResult(DetailQueryResultIterator.java:49)
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> Issue Analysis :- 
> Possible Root Cause :- It is because existing memoryblock is removed while it was in-use. This happened  because duplicate taskid generated. Sometime freed same memory addresses are assigned to another task which will initialize memory block to0 and this cause NegativeSizeArrayException whereas sometime freed memory will not be used any task of executor process but running task will try to access it and as that address is not part of process so JVM crash will happen.
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