Uma Maheswara Rao G created HDFS-5474:
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Summary: 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
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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