Vinayakumar B created HDFS-12120:
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Summary: Use new block for pre-RollingUpgrade files` append
requests
Key: HDFS-12120
URL: https://issues.apache.org/jira/browse/HDFS-12120
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Vinayakumar B
After the RollingUpgrade prepare, append on pre-RU files will re-open the same
last block and makes changes to it (appending extra data, changing genstamp
etc).
These changes to the block will not be tracked in Datanodes (either in trash or
via hardlinks)
This creates problem if RollingUpgrade.Rollback is called.
Since block state and size both changed, after rollback block will be marked
corrupted.
To avoid this, first time append on pre-RU files can be forced to write to new
block itself.
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