vergilchiu opened a new issue #4773: URL: https://github.com/apache/incubator-doris/issues/4773
**Describe the bug** Number of fe's connection will keep growing, even though my client is timed out。 Finally the maximum number of connections is exceeded and the client can not connect to fe server any more. [my conf] max_user_connections=100 **Exception** [fe.out] INFO: Use Simple share channel pool to create protobuf RPC proxy with interface interface org.apache.doris.rpc.PBackendService Exception in thread "ConnectScheduler Check Timer" java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(HashMap.java:1445) at java.util.HashMap$ValueIterator.next(HashMap.java:1474) at org.apache.doris.qe.ConnectScheduler$TimeoutChecker.run(ConnectScheduler.java:89) at java.util.TimerThread.mainLoop(Timer.java:555) at java.util.TimerThread.run(Timer.java:505) **OS env** - OS: centos7 - Version 0.12 ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For additional commands, e-mail: commits-h...@doris.apache.org