Jing Zhao created HDFS-7131:
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Summary: During HA upgrade, JournalNode should also copy the
committedTxnId file into the current directory
Key: HDFS-7131
URL: https://issues.apache.org/jira/browse/HDFS-7131
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 2.4.0
Reporter: Jing Zhao
Assignee: Jing Zhao
Currently while doing HA upgrade, we do not create a new committedTxnId file
in the new current directory of JournalNode. And before we have the fix in
HDFS-7042, since the file channel is never closed, for any new journal we're
actually updating the committedTxnId file in the previous directory. This can
cause NN to fail to start while rollback.
HDFS-7042 fixes the main part of the issue: the file channel inside of the
committedTxnId object gets closed thus later a new file can be created in the
current directory. But maybe it is still better to copy the content file during
the upgrade so that we can always use it for sanity check.
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