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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-6000) Avoid saving namespace when starting rolling upgrade
Date Sun, 23 Feb 2014 01:26:19 GMT
Jing Zhao created HDFS-6000:

             Summary: Avoid saving namespace when starting rolling upgrade
                 Key: HDFS-6000
                 URL: https://issues.apache.org/jira/browse/HDFS-6000
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Jing Zhao
            Assignee: Jing Zhao

Currently when administrator sends the "rollingUpgrade start" command to the active NN, the
NN will trigger a checkpoint (the rollback fsimage). This will cause NN not able to serve
for a period of time.

An alternative way is just to let the SBN do checkpoint, and rename the first checkpoint after
starting the rolling upgrade to rollback image. After the rollback image is on both the ANN
and the SBN, administrator can start upgrading the software.

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