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From "Michael Han (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (ZOOKEEPER-2847) Cannot bind to client port when reconfig based on old static config
Date Sat, 22 Sep 2018 04:44:00 GMT

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-2847?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael Han resolved ZOOKEEPER-2847.
------------------------------------
       Resolution: Fixed
    Fix Version/s: 3.6.0

Issue resolved by pull request 620
[https://github.com/apache/zookeeper/pull/620]

> Cannot bind to client port when reconfig based on old static config
> -------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-2847
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2847
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.5.3, 3.6.0
>            Reporter: Fangmin Lv
>            Assignee: Yisong Yue
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.6.0
>
>          Time Spent: 1h
>  Remaining Estimate: 0h
>
> When started the ensemble with old static config that the server string doesn't have
client port, dynamically remove and add the same server from the ensemble will cause that
server cannot bind to client port, and the ZooKeeper server cannot serve client requests anymore.
> From the code, we'll set the clientAddr to null when start up with old static config,
and dynamic config forces to have <client port> part, which will trigger the following
rebind code in QuorumPeer#processReconfig, and cause the address already in used issue.
>     public boolean processReconfig(QuorumVerifier qv, Long suggestedLeaderId, Long zxid,
boolean restartLE) {
>         ...
>         if (myNewQS != null && myNewQS.clientAddr != null
>                 && !myNewQS.clientAddr.equals(oldClientAddr)) {
>             cnxnFactory.reconfigure(myNewQS.clientAddr);
>             updateThreadName();
>         }
>         ...
>     }



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