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https://issues.apache.org/jira/browse/HBASE-1809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12758505#action_12758505
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stack commented on HBASE-1809:
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OK. The issue is that everything takes out a read lock in store EXCEPT get.
The first stack trace was misleading in that it was in getclosest. When I
looked at getclosest, it was taking out the read lock so I couldn't figure it
but up in HRegion#getclosest, at its tail, it makes a call to get with the row
returned by getclosest. The second stack trace is bare about what the issue is
in that its just a pure get.
The attached patch adds getting of a read lock to get. It lets go of the
messing I made in the first version of the patch where I added a flag to
BoundedRangeFilterInputStream. It was not fixing the root cause.
> 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
> Priority: Critical
> Fix For: 0.20.1
>
> Attachments: 1809-v2.patch, 1809.patch, 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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