Shashikant Banerjee created HDFS-15524:
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Summary: 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
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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