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Zhe Zhang commented on HDFS-11384: ---------------------------------- Thanks [~shv] for the update. The added Javadoc looks good. The unit test {{testBalancerRPCDelay}} fails for me locally with a NullPointerException. > 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 > 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 > > > 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. -- This message was sent by Atlassian JIRA (v6.3.15#6346) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org