CalvinKirs opened a new pull request, #25868:
URL: https://github.com/apache/doris/pull/25868
### What happened
When executing an export job, when the tablet version is inconsistent, the
task execution fails, but an NPE exception occurs.
```
23-10-24 13:35:03,983 WARN (exporting-pool--5|1008623)
[ExportExportingTask.lambda$exec$0():143] Tablet 241755 has changed version,
old version = 468061, now version = 468063
2023-10-24 13:35:03,984 ERROR (export-exporting-job-pool-0|523471)
[MasterTask.run():33] task exec error
java.lang.NullPointerException: null
at
org.apache.doris.task.ExportExportingTask.exec(ExportExportingTask.java:209)
~[doris-fe.jar:1.2-SNAPSHOT]
at org.apache.doris.task.MasterTask.run(MasterTask.java:31)
~[doris-fe.jar:1.2-SNAPSHOT]
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
~[?:1.8.0_131]
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
~[?:1.8.0_131]
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]
```
When the tablet version is inconsistent, an exception is thrown directly, so
the second step will not be executed. At this time, the task error is expected,
so this error will only be reported when the execution fails. We need to deal
with NPE.
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