Rename with overwrite flag true can make NameNode to stuck in safemode on NN
(crash + restart).
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Key: HDFS-2975
URL: https://issues.apache.org/jira/browse/HDFS-2975
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Affects Versions: 0.24.0
Reporter: Uma Maheswara Rao G
Assignee: Uma Maheswara Rao G
When we rename the file with overwrite flag as true, it will delete the
destination file blocks. After deleting the blocks, whenever it releases the
fsNameSystem lock, NN can give the invalidation work to corresponding DNs to
delete the blocks.
Parallaly it will sync the rename related edits to editlog file. At this step
before NN sync the edits if NN crashes, NN can stuck into safemode on restart.
This is because block already deleted from the DN as part of invalidations. But
dst file still exist as rename edits not persisted in log file and no DN will
report that blocks now.
This is similar to HDFS-2815
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