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Hudson commented on HDFS-13183: ------------------------------- FAILURE: Integrated in Jenkins build Hadoop-trunk-Commit #18268 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/18268/]) HDFS-13183. Standby NameNode process getBlocks request to reduce Active (weichiu: rev a3f44dacc1fa19acc4eefd1e2505e54f8629e603) * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/Balancer.java * (edit) hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/balancer/TestBalancerWithHANameNodes.java * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/NameNodeConnector.java > Standby NameNode process getBlocks request to reduce Active load > ---------------------------------------------------------------- > > Key: HDFS-13183 > URL: https://issues.apache.org/jira/browse/HDFS-13183 > Project: Hadoop HDFS > Issue Type: New Feature > Components: balancer & mover, namenode > Reporter: Xiaoqiao He > Assignee: Xiaoqiao He > Priority: Major > Fix For: 3.3.1, 3.4.0 > > Attachments: HDFS-13183-trunk.001.patch, HDFS-13183-trunk.002.patch, > HDFS-13183-trunk.003.patch, HDFS-13183.004.patch, HDFS-13183.005.patch, > HDFS-13183.006.patch, HDFS-13183.007.patch > > > The performance of Active NameNode could be impact when {{Balancer}} requests > #getBlocks, since query blocks of overly full DNs performance is extremely > inefficient currently. The main reason is {{NameNodeRpcServer#getBlocks}} > hold read lock for long time. In extreme case, all handlers of Active > NameNode RPC server are occupied by one reader > {{NameNodeRpcServer#getBlocks}} and other write operation calls, thus Active > NameNode enter a state of false death for number of seconds even for minutes. > The similar performance concerns of Balancer have reported by HDFS-9412, > HDFS-7967, etc. > If Standby NameNode can shoulder #getBlocks heavy burden, it could speed up > the progress of balancing and reduce performance impact to Active NameNode. -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org