wangbo opened a new issue #5002:
URL: https://github.com/apache/incubator-doris/issues/5002
**Describe the bug**
```
2020-12-01 21:53:59,216 WARN 37 [PublishVersionDaemon.publishVersion():210]
finish ts 1046352935 failed
java.util.ConcurrentModificationException: null
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1490) ~[?:?]
at java.util.HashMap$ValueIterator.next(HashMap.java:1518) ~[?:?]
at
org.apache.doris.transaction.GlobalTransactionMgr.finishTransaction(GlobalTransactionMgr.java:700)
~[palo-fe.jar:?]
at
org.apache.doris.transaction.PublishVersionDaemon.publishVersion(PublishVersionDaemon.java:208)
[palo-fe.jar:?]
at
org.apache.doris.transaction.PublishVersionDaemon.runAfterCatalogReady(PublishVersionDaemon.java:55)
[palo-fe.jar:?]
at
org.apache.doris.common.util.MasterDaemon.runOneCycle(MasterDaemon.java:58)
[palo-fe.jar:?]
```
Doris version: 0.12
but 0.13 also has the same problem
The reason is it doesn't use correct method to remove a element from a
collection when iterating the collection
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