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https://issues.apache.org/jira/browse/ZOOKEEPER-2251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16559223#comment-16559223
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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.
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