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Hudson commented on HADOOP-9955: -------------------------------- FAILURE: Integrated in Hadoop-Hdfs-0.23-Build #791 (See [https://builds.apache.org/job/Hadoop-Hdfs-0.23-Build/791/]) HADOOP-9955. RPC idle connection closing is extremely inefficient (daryn) (daryn: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1542113) * /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/CHANGES.txt * /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeys.java * /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Server.java * /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ipc/TestIPC.java > RPC idle connection closing is extremely inefficient > ---------------------------------------------------- > > Key: HADOOP-9955 > URL: https://issues.apache.org/jira/browse/HADOOP-9955 > Project: Hadoop Common > Issue Type: Sub-task > Components: ipc > Affects Versions: 2.0.0-alpha, 3.0.0 > Reporter: Daryn Sharp > Assignee: Daryn Sharp > Fix For: 3.0.0, 2.3.0, 0.23.10 > > Attachments: HADOOP-9955.branch-23.patch, HADOOP-9955.patch, > HADOOP-9955.patch > > > The RPC server listener loops accepting connections, distributing the new > connections to socket readers, and then conditionally & periodically performs > a scan for idle connections. The idle scan choses a _random index range_ to > scan in a _synchronized linked list_. > With 20k+ connections, walking the range of indices in the linked list is > extremely expensive. During the sweep, other threads (socket responder and > readers) that want to close connections are blocked, and no new connections > are being accepted. -- This message was sent by Atlassian JIRA (v6.1#6144)