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From "Fangmin Lv (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-2847) Cannot bind to client port when reconfig based on old static config
Date Fri, 28 Sep 2018 22:20:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16632598#comment-16632598

Fangmin Lv commented on ZOOKEEPER-2847:

Sorry, this is a known issue, I was planning to comment on the PR before it's merged (was
thinking Jenkins can catch this as well), but get distracted at that time.

I'm working with Yisong on this, will provide a PR today.

> 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 10m
>  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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