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
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