fe's connection whic is timed out can't be released #4773
Description
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