vergilchiu opened a new pull request #4774:
URL: https://github.com/apache/incubator-doris/pull/4774
#4773
Thread [Connect-Scheduler-Check-Timer] will stop due to failing to iterate
the connectionMap , because other threads will modify the connectionMap at the
same time.
Fe's connection whic is timed out can't be released because of thread
[Connect-Scheduler-Check-Timer] not working.
## 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)
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