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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10495) Block should be marked as missing if the all the replicas are on Decommissioned nodes.
Date Wed, 26 Apr 2017 19:47:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15985457#comment-15985457
] 

Kihwal Lee commented on HDFS-10495:
-----------------------------------

I've analyzed this and discussed potential solutions in HDFS-11609.  The current patch is
to allow replication from decommissioned node if there is no other choice.  If this is not
desirable, it is easy to mark the block simply missing.

> Block should be marked as missing if the all the replicas are on Decommissioned nodes.
> --------------------------------------------------------------------------------------
>
>                 Key: HDFS-10495
>                 URL: https://issues.apache.org/jira/browse/HDFS-10495
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.8.0
>            Reporter: Rushabh S Shah
>            Assignee: Rushabh S Shah
>
> As discussed on HDFS-8872, we should mark a block as missing if all the replicas on decommissioned
nodes since we can take the decommissioned nodes out of rotation anytime.
> We have seen multiple cases where all the replicas land on decommissioned nodes.
> After HDFS-7933, it doesn't mark as missing.



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