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From "Michael Han (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (ZOOKEEPER-3131) org.apache.zookeeper.server.WatchManager resource leak
Date Fri, 07 Sep 2018 00:36:00 GMT

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-3131?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael Han resolved ZOOKEEPER-3131.
------------------------------------
       Resolution: Fixed
    Fix Version/s: 3.6.0

Issue resolved by pull request 612
[https://github.com/apache/zookeeper/pull/612]

> org.apache.zookeeper.server.WatchManager resource leak
> ------------------------------------------------------
>
>                 Key: ZOOKEEPER-3131
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3131
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.5.3, 3.5.4, 3.6.0
>         Environment: -Xmx512m 
>            Reporter: ChaoWang
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.6.0
>
>          Time Spent: 2h
>  Remaining Estimate: 0h
>
> In some cases, the variable _watch2Paths_ in _Class WatchManager_ does not remove the
entry, even if the associated value "HashSet" is empty already. 
> The type of key in Map _watch2Paths_ is Watcher, instance of _NettyServerCnxn._ If
it is not removed when the associated set of paths is empty, it will cause the memory increases
little by little, and OutOfMemoryError triggered finally. 
>  
> {color:#FF0000}*Possible Solution:*{color}
> In the following function, the logic should be added to remove the entry.
> org.apache.zookeeper.server.WatchManager#removeWatcher(java.lang.String, org.apache.zookeeper.Watcher)
> if (paths.isEmpty())
> { watch2Paths.remove(watcher); }
> For the following function as well:
> org.apache.zookeeper.server.WatchManager#triggerWatch(java.lang.String, org.apache.zookeeper.Watcher.Event.EventType,
java.util.Set<org.apache.zookeeper.Watcher>)
>  
> Please confirm this issue?



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