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https://issues.apache.org/jira/browse/HDFS-11384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15995826#comment-15995826
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yunjiong zhao commented on HDFS-11384:
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[~shv] Thanks for the fix.
> 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: Konstantin Shvachko
> Fix For: 2.9.0, 2.7.4, 3.0.0-alpha3, 2.8.2
>
> Attachments: balancer.day.png, balancer.week.png,
> HDFS-11384.001.patch, HDFS-11384.002.patch, HDFS-11384.003.patch,
> HDFS-11384.004.patch, HDFS-11384.005.patch, HDFS-11384.006.patch,
> HDFS-11384-007.patch, HDFS-11384.008.patch, HDFS-11384.009.patch,
> HDFS-11384.010.patch, HDFS-11384.011.patch, HDFS-11384-branch-2.7.011.patch,
> HDFS-11384-branch-2.8.011.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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