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https://issues.apache.org/jira/browse/ZOOKEEPER-1669?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16085223#comment-16085223
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Cheney Sun commented on ZOOKEEPER-1669:
---------------------------------------
@Michael, Yes, I would like to fix it. Actually, I have made an initial change,
which gained a great performance improvement. I will submit the official patch
in the coming days.
> 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
> 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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