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https://issues.apache.org/jira/browse/HDFS-7894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14534608#comment-14534608
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Kihwal Lee commented on HDFS-7894:
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+1. The patch looks good. We've been running with this for a while.
> Rolling upgrade readiness is not updated in jmx until query command is issued.
> ------------------------------------------------------------------------------
>
> Key: HDFS-7894
> URL: https://issues.apache.org/jira/browse/HDFS-7894
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Kihwal Lee
> Assignee: Brahma Reddy Battula
> Priority: Critical
> Labels: BB2015-05-TBR
> Attachments: HDFS-7894-002.patch, HDFS-7894-003.patch, HDFS-7894.patch
>
>
> When a hdfs rolling upgrade is started and a rollback image is
> created/uploaded, the active NN does not update its {{rollingUpgradeInfo}}
> until it receives a query command via RPC. This results in inconsistent info
> being showing up in the web UI and its jmx page.
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