morningman opened a new pull request, #25096:
URL: https://github.com/apache/doris/pull/25096
## Proposed changes
The session variable in export job should be copied from session variable in
connection context.
Because both session variable in connection context and in export job may be
modified at same time,
cause ConcurrentModificationException like:
```
2023-10-07 22:56:12,818 WARN (mysql-nio-pool-2|249)
[ConnectProcessor.handleQueryException():396] Process one query failed because
unknown reason:
java.util.ConcurrentModificationException: null
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1437)
~[?:1.8.0_131]
at java.util.HashMap$KeyIterator.next(HashMap.java:1461)
~[?:1.8.0_131]
at
org.apache.doris.qe.VariableMgr.revertSessionValue(VariableMgr.java:238)
~[doris-fe.jar:1.2-SNAPSHOT]
at org.apache.doris.qe.StmtExecutor.execute(StmtExecutor.java:474)
~[doris-fe.jar:1.2-SNAPSHOT]
at org.apache.doris.qe.StmtExecutor.execute(StmtExecutor.java:438)
~[doris-fe.jar:1.2-SNAPSHOT]
at
org.apache.doris.qe.ConnectProcessor.handleQuery(ConnectProcessor.java:353)
~[doris-fe.jar:1.2-SNAPSHOT]
at
org.apache.doris.qe.ConnectProcessor.dispatch(ConnectProcessor.java:501)
~[doris-fe.jar:1.2-SNAPSHOT]
at
org.apache.doris.qe.ConnectProcessor.processOnce(ConnectProcessor.java:752)
~[doris-fe.jar:1.2-SNAPSHOT]
at
org.apache.doris.mysql.ReadListener.lambda$handleEvent$0(ReadListener.java:52)
~[doris-fe.jar:1.2-SNAPSHOT]
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
~[?:1.8.0_131]
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
~[?:1.8.0_131]
at java.lang.Thread.run(Thread.java:748) ~[?:1.8.0_131]
```
## Further comments
If this is a relatively large or complex change, kick off the discussion at
[[email protected]](mailto:[email protected]) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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