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https://issues.apache.org/jira/browse/HDFS-15524?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shashikant Banerjee updated HDFS-15524:
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Status: Patch Available (was: In Progress)
> Add edit log entry for Snapshot deletion GC thread snapshot deletion
> --------------------------------------------------------------------
>
> Key: HDFS-15524
> URL: https://issues.apache.org/jira/browse/HDFS-15524
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: snapshots
> Reporter: Shashikant Banerjee
> Assignee: Shashikant Banerjee
> Priority: Major
>
> Currently, Snapshot deletion Gc thread doesn't create an edit log transaction
> when the actual snapshot is garbage collected. In cases as such, what might
> happen is, if the gc thread deletes snapshots and then namenode is
> restarted, snapshots which were garbage collected by the snapshot gc thread
> prior restart will reapper till the gc thread again picks them up for garbage
> collection as the edits were not captured for actual garbage collection and
> at the same time data might have already been deleted from the datanodes
> which may lead to too many spurious missing block alerts.
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