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Posted to hdfs-issues@hadoop.apache.org by "yunjiong zhao (JIRA)" <ji...@apache.org> on 2017/02/01 20:38:51 UTC
[jira] [Updated] (HDFS-11384) Add option for balancer to disperse
getBlocks calls to avoid NameNode's rpc.CallQueueLength spike
[ https://issues.apache.org/jira/browse/HDFS-11384?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
yunjiong zhao updated HDFS-11384:
---------------------------------
Attachment: balancer.day.png
balancer.week.png
HDFS-11384.001.patch
This patch provide a option to let balancer blocked for $dfs.balancer.getBlocks.interval.millis milliseconds after every getBlocks RPC call.
The attached pictures shows the improvements after I apply this patch to our production cluster around Thursday 15:00.
> 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
>
>
> 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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