[jira] [Created] (HDFS-6031) NN running newer software rejects loading the fsimage during rolling upgrade.

["Haohui Mai (JIRA)" <ji...@apache.org>]

Haohui Mai created HDFS-6031:
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             Summary: NN running newer software rejects loading the fsimage during rolling upgrade.
                 Key: HDFS-6031
                 URL: https://issues.apache.org/jira/browse/HDFS-6031
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Haohui Mai
            Assignee: Tsz Wo (Nicholas), SZE


During rolling upgrade, the standby NN that has a newer layout version will complain about that the fsimage is too old, and require starting the NN using the {{-upgrade}} option:

{noformat}
File system image contains an old layout version -55. An upgrade to version -56 is required.
{noformat}

However, {{-upgrade}} is disabled during rolling upgrade, thus it is impossible to restart the standby NN:

{noformat}
org.apache.hadoop.hdfs.protocol.RollingUpgradeException: Failed to upgrade namenode since a rolling upgrade is already in progress. Existing rolling upgrade info:
...
{noformat}



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