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https://issues.apache.org/jira/browse/HDFS-17905?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ZanderXu resolved HDFS-17905.
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Resolution: Fixed
> Standby/Observer NameNode can leak pending DN messages
> ------------------------------------------------------
>
> Key: HDFS-17905
> URL: https://issues.apache.org/jira/browse/HDFS-17905
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Felix N
> Assignee: Felix N
> Priority: Major
> Labels: pull-request-available
>
> Since DNs do not report deleted blocks to NNs, in standby and observer
> namenodes, if not removed, pendingDNMessages will never drain messages from
> blocks that have already been deleted, leading to a leak.
> The solution is to clean up the messages inside removeBlock() as well.
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