rmetzger commented on pull request #14499:
URL: https://github.com/apache/flink/pull/14499#issuecomment-761008849
During my manual test, it seems that I can intercept a System.exit() in user
code of a batch job:
```
2021-01-15 16:16:01,950 WARN
org.apache.flink.runtime.security.FlinkSecurityManager [] - Exiting JVM
with status 0 is monitored: The system will exit due to this call.
org.apache.flink.runtime.UserSystemExitException: Flink user code attempted
to exit JVM.
at
org.apache.flink.runtime.security.FlinkSecurityManager.checkExit(FlinkSecurityManager.java:180)
[flink-dist_2.11-1.13-SNAPSHOT.jar:1.13-SNAPSHOT]
at java.lang.Runtime.exit(Runtime.java:107) [?:1.8.0_252]
at java.lang.System.exit(System.java:973) [?:1.8.0_252]
at de.robertmetzger.BatchJob$1.map(BatchJob.java:51)
[blob_p-f236836ff40f8dac63909ec8c69fb02a0823541c-6253f79b4f1453ea0b6abe7b75c2857e:?]
at de.robertmetzger.BatchJob$1.map(BatchJob.java:46)
[blob_p-f236836ff40f8dac63909ec8c69fb02a0823541c-6253f79b4f1453ea0b6abe7b75c2857e:?]
at
org.apache.flink.runtime.operators.chaining.ChainedMapDriver.collect(ChainedMapDriver.java:78)
[flink-dist_2.11-1.13-SNAPSHOT.jar:1.13-SNAPSHOT]
at
org.apache.flink.runtime.operators.util.metrics.CountingCollector.collect(CountingCollector.java:35)
[flink-dist_2.11-1.13-SNAPSHOT.jar:1.13-SNAPSHOT]
at
org.apache.flink.runtime.operators.DataSourceTask.invoke(DataSourceTask.java:204)
[flink-dist_2.11-1.13-SNAPSHOT.jar:1.13-SNAPSHOT]
at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:762)
[flink-dist_2.11-1.13-SNAPSHOT.jar:1.13-SNAPSHOT]
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:571)
[flink-dist_2.11-1.13-SNAPSHOT.jar:1.13-SNAPSHOT]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_252]
```
For streaming jobs, intercepting regular operators (such as map), works fine
as well.
However for sources, it won't work.
The StackTrace to a source is the following:
```
2021-01-15 16:21:45,859 INFO de.robertmetzger.StreamingJob
[] - I'M here on the Taskmanager
java.lang.RuntimeException: null
at de.robertmetzger.StreamingJob$2.map(StreamingJob.java:70)
[blob_p-eb6613e604b074ad283e611328dcbf036a1f86cb-4d496ef1ec5656acaa10612f41dc4839:?]
at de.robertmetzger.StreamingJob$2.map(StreamingJob.java:67)
[blob_p-eb6613e604b074ad283e611328dcbf036a1f86cb-4d496ef1ec5656acaa10612f41dc4839:?]
at
org.apache.flink.streaming.api.operators.StreamMap.processElement(StreamMap.java:38)
[flink-dist_2.11-1.13-SNAPSHOT.jar:1.13-SNAPSHOT]
at
org.apache.flink.streaming.runtime.tasks.CopyingChainingOutput.pushToOperator(CopyingChainingOutput.java:71)
[flink-dist_2.11-1.13-SNAPSHOT.jar:1.13-SNAPSHOT]
at
org.apache.flink.streaming.runtime.tasks.CopyingChainingOutput.collect(CopyingChainingOutput.java:46)
[flink-dist_2.11-1.13-SNAPSHOT.jar:1.13-SNAPSHOT]
at
org.apache.flink.streaming.runtime.tasks.CopyingChainingOutput.collect(CopyingChainingOutput.java:26)
[flink-dist_2.11-1.13-SNAPSHOT.jar:1.13-SNAPSHOT]
at
org.apache.flink.streaming.api.operators.CountingOutput.collect(CountingOutput.java:50)
[flink-dist_2.11-1.13-SNAPSHOT.jar:1.13-SNAPSHOT]
at
org.apache.flink.streaming.api.operators.CountingOutput.collect(CountingOutput.java:28)
[flink-dist_2.11-1.13-SNAPSHOT.jar:1.13-SNAPSHOT]
at
org.apache.flink.streaming.api.operators.StreamSourceContexts$ManualWatermarkContext.processAndCollect(StreamSourceContexts.java:317)
[flink-dist_2.11-1.13-SNAPSHOT.jar:1.13-SNAPSHOT]
at
org.apache.flink.streaming.api.operators.StreamSourceContexts$WatermarkContext.collect(StreamSourceContexts.java:411)
[flink-dist_2.11-1.13-SNAPSHOT.jar:1.13-SNAPSHOT]
at de.robertmetzger.StreamingJob$1.run(StreamingJob.java:57)
[blob_p-eb6613e604b074ad283e611328dcbf036a1f86cb-4d496ef1ec5656acaa10612f41dc4839:?]
at
org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:110)
[flink-dist_2.11-1.13-SNAPSHOT.jar:1.13-SNAPSHOT]
at
org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:66)
[flink-dist_2.11-1.13-SNAPSHOT.jar:1.13-SNAPSHOT]
at
org.apache.flink.streaming.runtime.tasks.SourceStreamTask$LegacySourceFunctionThread.run(SourceStreamTask.java:245)
[flink-dist_2.11-1.13-SNAPSHOT.jar:1.13-SNAPSHOT]
```
I believe sources are relatively important, in particular because some users
have their own implementations there.
@hwanju do you want to address this in this PR, or in a follow up?
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