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https://issues.apache.org/jira/browse/HDFS-8872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15985295#comment-15985295
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Zhe Zhang commented on HDFS-8872:
---------------------------------
Linked HDFS-10495.
> Reporting of missing blocks is different in fsck and namenode ui/metasave
> -------------------------------------------------------------------------
>
> Key: HDFS-8872
> URL: https://issues.apache.org/jira/browse/HDFS-8872
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.6.0
> Reporter: Rushabh S Shah
> Assignee: Rushabh S Shah
>
> Namenode ui and metasave will not report a block as missing if the only
> replica is on decommissioning/decomissioned node while fsck will show it as
> MISSING.
> Since decommissioned node can be formatted/removed anytime, we can actually
> lose the block.
> Its better to alert on namenode ui if the only copy is on
> decomissioned/decommissioning node.
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