[jira] Updated: (HDFS-1300) Decommissioning nodes does not increase replication priority

["Dmytro Molkov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-1300?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dmytro Molkov updated HDFS-1300:
--------------------------------

    Status: Patch Available  (was: Open)

Submitting to Hudson.
Can someone look at the code to see that it is OK?

> Decommissioning nodes does not increase replication priority
> ------------------------------------------------------------
>
>                 Key: HDFS-1300
>                 URL: https://issues.apache.org/jira/browse/HDFS-1300
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 0.21.0, 0.20.2, 0.20.1, 0.20-append, 0.20.3, 0.22.0
>            Reporter: Dmytro Molkov
>            Assignee: Dmytro Molkov
>             Fix For: 0.22.0
>
>         Attachments: HDFS-1300.patch
>
>
> Currently when you decommission a node each block is only inserted into neededReplications if it is not there yet. This causes a problem of a block sitting in a low priority queue when all replicas sit on the nodes being decommissioned.
> The common usecase for decommissioning nodes for us is proactively exclude them before they went bad, so it would be great to get the blocks at risk onto the live datanodes as quickly as possible.

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