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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-7131) During HA upgrade, JournalNode should also copy the committedTxnId file into the current directory
Date Tue, 23 Sep 2014 01:37:34 GMT
Jing Zhao created HDFS-7131:
-------------------------------

             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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