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Kihwal Lee commented on HADOOP-14035: ------------------------------------- +1 for the branch-2 patch. > Reduce fair call queue backoff's impact on clients > -------------------------------------------------- > > Key: HADOOP-14035 > URL: https://issues.apache.org/jira/browse/HADOOP-14035 > Project: Hadoop Common > Issue Type: Sub-task > Components: ipc > Affects Versions: 2.7.0 > Reporter: Daryn Sharp > Assignee: Daryn Sharp > Attachments: HADOOP-14035.branch-2.patch, HADOOP-14035.patch > > > When fcq backoff is enabled and an abusive client overflows the call queue, > its connection is closed, as well as subsequent good client connections. > Disconnects are very disruptive, esp. to multi-threaded clients with multiple > outstanding requests, or clients w/o a retry proxy (ex. datanodes). > Until the abusive user is downgraded to a lower priority queue, > disconnect/reconnect mayhem occurs which significantly degrades performance. > Server metrics look good despite horrible client latency. > The fcq should utilize selective ipc disconnects to avoid pushback > disconnecting good clients. -- 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