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https://issues.apache.org/jira/browse/HDFS-8872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15318646#comment-15318646
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Rushabh S Shah commented on HDFS-8872:
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Thanks a lot [~mingma] for your valuable suggestions.
Let me close this jira as duplicate since this jira was created not to alert
the block as missing if all the replicas are on Decommissioning node.
This work is done via HDFS-7933.
I will create a new jira to alert a block as missing if all the replicas are on
Decommissioned nodes.
> 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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