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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-5889) When rolling upgrade is in progress, standby NN should create checkpoint for downgrade.
Date Wed, 05 Feb 2014 07:56:08 GMT
Tsz Wo (Nicholas), SZE created HDFS-5889:
--------------------------------------------

             Summary: When rolling upgrade is in progress, standby NN should create checkpoint
for downgrade.
                 Key: HDFS-5889
                 URL: https://issues.apache.org/jira/browse/HDFS-5889
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: namenode
            Reporter: Tsz Wo (Nicholas), SZE
            Assignee: Tsz Wo (Nicholas), SZE


After rolling upgrade is started and checkpoint is disabled, the edit log may grow to a huge
size.  It is not a problem if rolling upgrade is finalized normally since NN keeps the current
state in memory and it writes a new checkpoint during finalize.  However, it is a problem
if admin decides to downgrade.  It could take a long time to apply edit log.  Rollback does
not have such problem.



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