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Posted to hdfs-dev@hadoop.apache.org by "Dmytro Molkov (JIRA)" <ji...@apache.org> on 2010/07/14 20:33:51 UTC

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

Decommissioning nodes does not increase replication priority
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                 Key: HDFS-1300
                 URL: https://issues.apache.org/jira/browse/HDFS-1300
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 0.20.2, 0.20.1, 0.20-append, 0.20.3, 0.21.0, 0.22.0
            Reporter: Dmytro Molkov
            Assignee: Dmytro Molkov
             Fix For: 0.22.0


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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