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https://issues.apache.org/jira/browse/HBASE-22632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16873184#comment-16873184
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Duo Zhang commented on HBASE-22632:
-----------------------------------
A UT to reproduce the problem.
> SplitTableRegionProcedure and MergeTableRegionsProcedure should skip store
> files for unknown column families
> ------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-22632
> URL: https://issues.apache.org/jira/browse/HBASE-22632
> Project: HBase
> Issue Type: Bug
> Components: proc-v2
> Reporter: Duo Zhang
> Assignee: Duo Zhang
> Priority: Major
> Attachments: HBASE-22632-UT.patch
>
>
> Hit this problem in our internal staging cluster. Not sure why, but probably,
> there was a partial successful 'alter table' call that removed a family. As
> it is 'partial successful', there are still some stale store files of the
> removed family left under the region directory. And in
> SplitTableRegionProcedure and MergeTableRegionsProcedure, we will get all the
> store files by listing the file system, so we will also get the stale store
> files for the family which should have been removed already, and then causes
> NPE when we want to access the ColumnFamilyDescriptor.
> Although it is not the common case that there are store files for removed
> families, but FWIW, I think we can do something to make our procedures more
> robust...
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