tokoot created ZOOKEEPER-1669:
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Summary: 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
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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