Haohui Mai created HDFS-6032:
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Summary: -rollingUpgrade query hits NPE after the NN restarts
Key: HDFS-6032
URL: https://issues.apache.org/jira/browse/HDFS-6032
Project: Hadoop HDFS
Issue Type: Sub-task
Affects Versions: HDFS-5535 (Rolling upgrades)
Reporter: Haohui Mai
Assignee: Haohui Mai
Attachments: HDFS-6032.000.patch
{{NamenodeRpcServer#rollingUpgrade}} throws an NPE during query after the NN
restarts. It complains that the BlockPoolId in {{RollingUpgradeInfo}} equals to
{{null}}.
Further investigation shows that the {{BlockPoolId}} remains uninitialized when
{{FSImage#loadFSImage}} constructs the {{RollingUpgradeInfo}} object, leading
to the NPE.
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