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https://issues.apache.org/jira/browse/ZOOKEEPER-1669?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16091472#comment-16091472
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ASF GitHub Bot commented on ZOOKEEPER-1669:
-------------------------------------------
GitHub user CheneySun opened a pull request:
https://github.com/apache/zookeeper/pull/312
ZOOKEEPER-1669: Operations to server will be timed-out while thousands of
sessions expired same time
just porting the work in [ZOOKEEPER-1347] to branch 3.4
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/CheneySun/zookeeper branch-3.4
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/zookeeper/pull/312.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #312
----
commit 59d71077640643f13f036dd67741ef944b48255b
Author: Cheney Sun <su...@qiyi.com>
Date: 2017-07-18T12:14:01Z
ZOOKEEPER-1669: Operations to server will be timed-out while thousands of
sessions expired same time
----
> Operations to server will be timed-out while thousands of sessions expired
> same time
> ------------------------------------------------------------------------------------
>
> Key: ZOOKEEPER-1669
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1669
> Project: ZooKeeper
> Issue Type: Improvement
> Components: server
> Affects Versions: 3.3.5
> Reporter: tokoot
> Assignee: Cheney Sun
> Labels: performance
>
> If there are thousands of clients, and most of them disconnect with server
> same time(client restarted or servers partitioned with clients), the server
> will busy to close those "connections" and become unavailable. The problem is
> in following:
> private void closeSessionWithoutWakeup(long sessionId) {
> HashSet<NIOServerCnxn> cnxns;
> synchronized (this.cnxns) {
> cnxns = (HashSet<NIOServerCnxn>)this.cnxns.clone(); // other
> thread will block because of here
> }
> ...
> }
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