zookeeper-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Andor Molnar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-2251) Add Client side packet response timeout to avoid infinite wait.
Date Tue, 06 Mar 2018 13:35:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16387776#comment-16387776
] 

Andor Molnar commented on ZOOKEEPER-2251:
-----------------------------------------

[~awkejiang]

I believe that [~hanm]'s concerns have to be addressed first on GitHub.

> 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
>             Fix For: 3.5.4, 3.6.0, 3.4.12
>
>         Attachments: ZOOKEEPER-2251-01.patch, ZOOKEEPER-2251-02.patch, ZOOKEEPER-2251-03.patch,
ZOOKEEPER-2251-04.patch
>
>
> 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)

Mime
View raw message