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https://issues.apache.org/jira/browse/HBASE-13855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14581585#comment-14581585
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Jingcheng Du commented on HBASE-13855:
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Hi Jon [~jmhsieh], do you want to take a look?
> NPE in PartitionedMobCompactor
> ------------------------------
>
> Key: HBASE-13855
> URL: https://issues.apache.org/jira/browse/HBASE-13855
> Project: HBase
> Issue Type: Sub-task
> Components: mob
> Affects Versions: hbase-11339
> Reporter: Jingcheng Du
> Assignee: Jingcheng Du
> Fix For: hbase-11339
>
> Attachments: HBASE-13855.diff
>
>
> In PartitionedMobCompactor, mob files are split into partitions, the
> compactions of partitions run in parallel.
> The partitions share the same set of del files. There might be race
> conditions when open readers of del store files in each partition which can
> cause NPE.
> In this patch, we will pre-create the reader for each del store file to avoid
> this issue.
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