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https://issues.apache.org/jira/browse/HDFS-6032?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jing Zhao resolved HDFS-6032.
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Resolution: Fixed
> -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
> Components: datanode, ha, hdfs-client, namenode
> 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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