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https://issues.apache.org/jira/browse/HDFS-5474?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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sathish updated HDFS-5474:
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Attachment: HDFS-5474-001.patch
Attaching a simple fix in this patch,please review it
> Deletesnapshot can make Namenode in safemode on NN restarts.
> ------------------------------------------------------------
>
> Key: HDFS-5474
> URL: https://issues.apache.org/jira/browse/HDFS-5474
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: snapshots
> Reporter: Uma Maheswara Rao G
> Assignee: sathish
> Attachments: HDFS-5474-001.patch
>
>
> When we deletesnapshot, we are deleting the blocks associated to that
> snapshot and after that we do logsync to editlog about deleteSnapshot.
> There can be a chance that blocks removed from blocks map but before log sync
> if there is BR , NN may finds that block does not exist in blocks map and
> may invalidate that block. As part HB, invalidation info also can go. After
> this steps if Namenode shutdown before actually do logsync, On restart it
> will still consider that snapshot Inodes and expect blocks to report from DN.
> Simple solution is, we should simply move down that blocks removal after
> logsync only. Similar to delete op.
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