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https://issues.apache.org/jira/browse/HBASE-1809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12750174#action_12750174
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stack commented on HBASE-1809:
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My guess is the file was closed by one thread while another was trying to read.
This is a bit of a race condition. Simple fix would be to add a volatile
'closed' flag.. returning immediately from read and available when set (or just
check for a null 'in'). Better would be to figure how this race condition
arose (Something peculiar to getClosestRowBefore).
> NPE thrown in BoundedRangeFileInputStream
> -----------------------------------------
>
> Key: HBASE-1809
> URL: https://issues.apache.org/jira/browse/HBASE-1809
> Project: Hadoop HBase
> Issue Type: Bug
> Components: io
> Environment: All
> Reporter: Mathias Herberts
> Fix For: 0.20.1
>
> Attachments: HFile-returnDecompressor.patch
>
>
> NPE is thrown in BoundedRangeFileInputStream.read when attempting to
> synchronize on 'in' (line 97).
> This probably means the BRFIS was created with a null FSDIS.
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