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https://issues.apache.org/jira/browse/HDFS-13135?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16361517#comment-16361517
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Kihwal Lee edited comment on HDFS-13135 at 2/12/18 10:06 PM:
-------------------------------------------------------------
>From what I remember, a change (bug fix?) intentionally made a lease to be
>removed from LeaseManager, but left it in the INode in the snapshot. I argue
>that it is not a correct design. Some blocks can be left in
>under-construction state forever without any block recovery. This can cause
>data loss, since re-replication won't happen for those blocks. When namenode
>is restarted, all leases will be restored based on the files
>under-construction section and also on INodeUnderConstructionFeature.
I am not a snapshot expert, so I can't say what is the correct fix. I've seen
conflicting requirements on under-construction blocks in a snapshot. IMO, if an
under-construction block ends up only in a snapshot (current view deleted while
being written), a block recovery should somehow be done.
was (Author: kihwal):
>From what I remember, a change (bug fix?) intentionally made a lease to be
>removed from LeaseManager, but left it in the INode in the snapshot. I argue
>that it is not a correct design. Some blocks can be left in
>under-construction state forever without any block recovery. This can cause
>data loss, since re-replication won't happen for those blocks. When namenode
>is restarted, all leases will be restored based on the files
>under-construction section and also on INodeUnderConstructionFeature.
I am not a snapshot expert, so I can't say what is the correct fix. I've seen
conflicting requirements on under-construction blocks in a snapshot. IMO, an
under-construction block ends up only in a snapshot (current view deleted while
being written), a block recovery should somehow be done.
> Lease not deleted when deleting INodeReference
> ----------------------------------------------
>
> Key: HDFS-13135
> URL: https://issues.apache.org/jira/browse/HDFS-13135
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Sean Mackrory
> Assignee: Sean Mackrory
> Priority: Major
> Attachments: HDFS-13135.001.patch
>
>
> In troubleshooting an occurrence of HDFS-13115, it seemed that there was
> another underlying root cause that should also be addressed. There was an
> INodeReference that was deleted and the lease on it was not subsequently
> deleted because it was never added to the reclaim context.
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