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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7759) Provide existence-of-a-second-file implementation for pinning blocks on Datanode
Date Tue, 17 Feb 2015 23:27:11 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14325105#comment-14325105
] 

Colin Patrick McCabe commented on HDFS-7759:
--------------------------------------------

This seems like it will lead to a lot of problems.  If blocks can't be moved, then the balancer
can't work.  It means that if nodes are lost in the cluster, then we can't re-replicate. 
Why not simply write a pluggable block placement policy instead?

> Provide existence-of-a-second-file implementation for pinning blocks on Datanode
> --------------------------------------------------------------------------------
>
>                 Key: HDFS-7759
>                 URL: https://issues.apache.org/jira/browse/HDFS-7759
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>            Reporter: zhaoyunjiong
>            Assignee: zhaoyunjiong
>         Attachments: HDFS-7759.patch
>
>
> Provide existence-of-a-second-file implementation for pinning blocks on Datanode  and
let admin choosing the mechanism(use sticky bit or existence-of-a-second-file) to pinning
blocks on favored Datanode.



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