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https://issues.apache.org/jira/browse/HBASE-2471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12859000#action_12859000
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Todd Lipcon commented on HBASE-2471:
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How would the region get removed between the RS failure and the HM splitting
the logs? Don't the regions need to be assigned in order for the table to be
dropped or a split to happen?
> Splitting logs, we'll make an output file though the region no longer exists
> ----------------------------------------------------------------------------
>
> Key: HBASE-2471
> URL: https://issues.apache.org/jira/browse/HBASE-2471
> Project: Hadoop HBase
> Issue Type: Bug
> Reporter: stack
> Fix For: 0.20.5, 0.21.0
>
>
> The "human unit tester" (Kannan) last night wondered what happens splitting
> logs and we come across an edit whose region has since been removed. Taking
> a look, it looks like we'll create the output file and write the edits for
> the no-longer-extant region anyways. This will leave litter in the
> filesystem -- region split files that will never be used nor removed. This
> issue is about verifying that indeed this is whats happening (We do
> SequenceFile.createWriter with the overwrite flag set to true which tracing
> seems to mean create all intermediary directories -- to be verified) and if
> it indeed is happening, fixing split so unless the region dir exists, don't
> write out edits.. just drop them.
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