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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