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Rohith Sharma K S commented on HADOOP-14412: -------------------------------------------- I will commit trunk patch later of today if no more objections. Branch-2-v2 patch jenkins has not triggered. Branch-2.8 patch looks good to me. > HostsFileReader#getHostDetails is very expensive on large clusters > ------------------------------------------------------------------ > > Key: HADOOP-14412 > URL: https://issues.apache.org/jira/browse/HADOOP-14412 > Project: Hadoop Common > Issue Type: Bug > Components: util > Affects Versions: 2.8.0 > Reporter: Jason Lowe > Assignee: Jason Lowe > Attachments: HADOOP-14412.001.patch, HADOOP-14412.002.patch, > HADOOP-14412-branch-2.001.patch, HADOOP-14412-branch-2.002.patch, > HADOOP-14412-branch-2.8.002.patch > > > After upgrading one of our large clusters to 2.8 we noticed many IPC server > threads of the resourcemanager spending time in NodesListManager#isValidNode > which in turn was calling HostsFileReader#getHostDetails. The latter is > creating complete copies of the include and exclude sets for every node > heartbeat, and these sets are not small due to the size of the cluster. > These copies are causing multiple resizes of the underlying HashSets being > filled and creating lots of garbage. -- This message was sent by Atlassian JIRA (v6.3.15#6346) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org