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From "Mingliang Liu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-10335) Mover$Processor#chooseTarget() always chooses the first matching target storage group
Date Thu, 28 Apr 2016 23:34:12 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10335?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Mingliang Liu updated HDFS-10335:
    Attachment: HDFS-10335.000.patch

Re-uploading the same patch to trigger Jenkins.

> Mover$Processor#chooseTarget() always chooses the first matching target storage group
> -------------------------------------------------------------------------------------
>                 Key: HDFS-10335
>                 URL: https://issues.apache.org/jira/browse/HDFS-10335
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: balancer & mover
>    Affects Versions: 2.8.0
>            Reporter: Mingliang Liu
>            Assignee: Mingliang Liu
>            Priority: Critical
>         Attachments: HDFS-10335.000.patch, HDFS-10335.000.patch
> Currently the {{org.apache.hadoop.hdfs.server.mover.Mover$Processor#chooseTarget()}}
always chooses the first matching target datanode from the candidate list. This may make the
mover schedule a lot of task to a few of the datanodes (first several datanodes of the candidate
list). The overall performance will suffer significantly from this because of the saturated
network/disk usage. Specially, if the {{dfs.datanode.balance.max.concurrent.moves}} is set,
the scheduled move task will be queued on a few of the storage group, regardless of other
available storage groups. We need an algorithm which can distribute the move tasks approximately
even across all the candidate target storage groups.
> Thanks [~szetszwo] for offline discussion.

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