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https://issues.apache.org/jira/browse/HDFS-4768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13643288#comment-13643288
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Chris Nauroth commented on HDFS-4768:
-------------------------------------
This problem occasionally causes a failure in {{TestDeleteBlockPool}}. The
client request to delete the block pool races with the block scanner.
Depending on the timing, the verification log file could remain in place, and
then deleting the underlying storage fails. I can reproduce the problem more
easily on Windows.
> block scanner does not close verification log when a block pool is being
> deleted (but the datanode remains running)
> -------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-4768
> URL: https://issues.apache.org/jira/browse/HDFS-4768
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 3.0.0, 2.0.4-alpha
> Reporter: Chris Nauroth
> Assignee: Chris Nauroth
>
> HDFS-4274 fixed a file handle leak of the block scanner's verification logs
> by adding method {{BlockPoolSliceScanner#shutdown}} and guaranteeing that the
> method gets called for each live {{BlockPoolSliceScanner}} during datanode
> shutdown. However, that patch did not consider the case of deleting a block
> pool via {{ClientDatanodeProtocol#deleteBlockPool}} while the datanode
> remains running.
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