[jira] [Commented] (FLINK-29629) FlameGraph is empty for Legacy Source Threads

["Peter Vary (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-29629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17629824#comment-17629824 ] 

Peter Vary commented on FLINK-29629:
------------------------------------

Most probably I will not have time to work on this part of the code in the near future :(. Mostly only filed the ticket to document the current situation which is not ideal. I fear that by closing the ticket the 3 of us will be the only people to remember the issue for a while, but if this is the way how we handle these situations in Flink, feel free to go ahead and close the ticket (I am just learning the processes :)).
Thanks, for all the help here [~zhuzh]!

> 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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