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Hudson commented on ZOOKEEPER-2251: ----------------------------------- SUCCESS: Integrated in Jenkins build ZooKeeper-trunk #122 (See [https://builds.apache.org/job/ZooKeeper-trunk/122/]) ZOOKEEPER-2251: Add Client side packet response timeout to avoid (hanm: rev 9f82798415351a20136ceb1640b1781723e51cc1) * (add) src/java/test/org/apache/zookeeper/ClientRequestTimeoutTest.java * (edit) zookeeper-docs/src/documentation/content/xdocs/zookeeperProgrammers.xml * (edit) src/java/main/org/apache/zookeeper/ZooKeeper.java * (edit) src/java/main/org/apache/zookeeper/client/ZKClientConfig.java * (edit) src/java/main/org/apache/zookeeper/ClientCnxn.java * (edit) src/java/main/org/apache/zookeeper/KeeperException.java > Add Client side packet response timeout to avoid infinite wait. > --------------------------------------------------------------- > > Key: ZOOKEEPER-2251 > URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2251 > Project: ZooKeeper > Issue Type: Bug > Components: java client > Affects Versions: 3.4.9, 3.5.2, 3.4.11 > Reporter: nijel > Assignee: Mohammad Arshad > Priority: Critical > Labels: fault, pull-request-available > Fix For: 3.6.0, 3.5.5 > > Attachments: ZOOKEEPER-2251-01.patch, ZOOKEEPER-2251-02.patch, > ZOOKEEPER-2251-03.patch, ZOOKEEPER-2251-04.patch > > Time Spent: 3.5h > Remaining Estimate: 0h > > I came across one issue related to Client side packet response timeout In my > cluster many packet drops happened for some time. > One observation is the zookeeper client got hanged. As per the thread dump it > is waiting for the response/ACK for the operation performed (synchronous API > used here). > I am using > zookeeper.serverCnxnFactory=org.apache.zookeeper.server.NIOServerCnxnFactory > Since only few packets missed there is no DISCONNECTED event occurred. > Need add a "response time out" for the operations or packets. > *Comments from [~rakeshr]* > My observation about the problem:- > * Can use tools like 'Wireshark' to simulate the artificial packet loss. > * Assume there is only one packet in the 'outgoingQueue' and unfortunately > the server response packet lost. Now, client will enter into infinite > waiting. > https://github.com/apache/zookeeper/blob/trunk/src/java/main/org/apache/zookeeper/ClientCnxn.java#L1515 > * Probably we can discuss more about this problem and possible solutions(add > packet ACK timeout or another better approach) in the jira. -- This message was sent by Atlassian JIRA (v7.6.3#76005)