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From "Fangmin Lv (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (ZOOKEEPER-3218) zk server reopened,the interval for observer connect to the new leader is too long,then session expired
Date Fri, 18 Jan 2019 02:46:00 GMT

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-3218?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Fangmin Lv resolved ZOOKEEPER-3218.
-----------------------------------
       Resolution: Fixed
    Fix Version/s: 3.6.0

Issue resolved by pull request 747
[https://github.com/apache/zookeeper/pull/747]

> zk server reopened,the interval for observer connect to the new leader is too long,then
session expired
> -------------------------------------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-3218
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3218
>             Project: ZooKeeper
>          Issue Type: Bug
>         Environment: win7 32bits
> zookeeper 3.4.6、3.4.13
>            Reporter: yangoofy
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.6.0
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> two participants、one observer,zkclient connect to observer。
> Then,close the two participants,the zookeeper server cloesed
> Ten seconds later,reopen the two participants,and leader selected
> ----------------------------------------------------------------------------
> But the observer can't connect to the new leader immediately。Because in lookForLeader,
the observer use blockingQueue(recvqueue)  to offer/poll notifications,when the recvqueue
is empty,poll from recvqueue will be blocked,and timeout is 200ms,400ms,800ms....60s。
> For example,09:59:59 observer poll notification,recvqueue was empty and timeout was
60s;10:00:00 two participants reopened and reselected;10:00:59 observer polled notification,connected
to the new leader
> But the maxSessionTimeout default to 40s。The session expired
> -----------------------------------------------------------------------------
> Please improve it:observer should connect to the new leader as soon as possible



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