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From "Dmytro Molkov (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-1300) Decommissioning nodes does not increase replication priority
Date Tue, 31 Aug 2010 22:27:55 GMT

     [ 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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