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From "Mingliang Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11384) Add option for balancer to disperse getBlocks calls to avoid NameNode's rpc.CallQueueLength spike
Date Thu, 30 Mar 2017 21:05:41 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15949824#comment-15949824
] 

Mingliang Liu commented on HDFS-11384:
--------------------------------------

Ping [~szetszwo].

> Add option for balancer to disperse getBlocks calls to avoid NameNode's rpc.CallQueueLength
spike
> -------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-11384
>                 URL: https://issues.apache.org/jira/browse/HDFS-11384
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: balancer & mover
>    Affects Versions: 2.7.3
>            Reporter: yunjiong zhao
>            Assignee: yunjiong zhao
>         Attachments: balancer.day.png, balancer.week.png, HDFS-11384.001.patch, HDFS-11384.002.patch
>
>
> When running balancer on hadoop cluster which have more than 3000 Datanodes will cause
NameNode's rpc.CallQueueLength spike. We observed this situation could cause Hbase cluster
failure due to RegionServer's WAL timeout.



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