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https://issues.apache.org/jira/browse/FLINK-29629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17632111#comment-17632111
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Zhu Zhu commented on FLINK-29629:
---------------------------------
I opened another improvement ticket FLINK-29989 to track the future work.
Thanks for reporting the problem and all the inputs! [~pvary]
> FlameGraph is empty for Legacy Source Threads
> ---------------------------------------------
>
> Key: FLINK-29629
> URL: https://issues.apache.org/jira/browse/FLINK-29629
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Web Frontend
> Reporter: Peter Vary
> Priority: Major
>
> Thread dump gets the stack trace for the {{Custom Source}} thread, but this
> thread is always in {{TIMED_WAITING}}:
> {code}
> "Source: Custom Source -> A random source (1/2)#0" ...
> java.lang.Thread.State: TIMED_WAITING (parking)
> at jdk.internal.misc.Unsafe.park(java.base@11.0.16/Native Method)
> - parking to wait for <0x00000000ea775750> (a
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
> at java.util.concurrent.locks.LockSupport.parkNanos()
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await()
> at
> org.apache.flink.streaming.runtime.tasks.mailbox.TaskMailboxImpl.take()
> at
> org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.processMailsWhenDefaultActionUnavailable(MailboxProcessor.java:335)
> at
> org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.processMail(MailboxProcessor.java:324)
> at
> org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:201)
> [..]
> {code}
> The actual code is run in the {{Legacy Source Thread}}:
> {code}
> "Legacy Source Thread - Source: Custom Source -> A random source (1/2)#0" ...
> java.lang.Thread.State: RUNNABLE
> {code}
> This causes the WebUI FlameGraph to be empty of any useful data.
> This is an example code to reproduce:
> {code}
> DataStream<RowData> inputStream = env.addSource(new
> RandomRecordSource(recordSize));
> inputStream = inputStream.map(new CounterMapper());
> FlinkSink.forRowData(inputStream).tableLoader(loader).append();
> {code}
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