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https://issues.apache.org/jira/browse/SPARK-28849?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Saisai Shao updated SPARK-28849:
--------------------------------
Description:
Spark's {{UnsafeShuffleWriter}} may run into infinite loop when calling
{{transferTo}} occasionally. What we saw is that when merging shuffle temp
file, the task is hung for several hours until killed manually. Here's the log
you can see, there's no any log after spill the shuffle files to disk.
!95330.png!
And here is the thread dump, we could see that it always calls native method
{{size0}}.
!91ADA.png!
And we use strace to trace the system, we found that this thread is always
calling {{fstat}}, here is the screenshot.
!D18F4.png!
We didn't find the root cause here, I guess it might be related to FS or disk
issue. Anyway we should figure out a way to fail fast in a such scenario.
was:
Spark's {{UnsafeShuffleWriter}} may run into infinite loop when calling
{{transferTo}} occasionally. What we saw is that when merging shuffle temp
file, the task is hung for several hours until killed manually. Here's the log
you can see, there's no any log after spill the shuffle files to disk.
!95330.png!
And here is the thread dump, we could see that it is calling native method
{{size0}}.
!91ADA.png!
And we use strace to trace the system, we found that this thread is always
calling {{fstat}}, here is the screenshot.
!D18F4.png!
We didn't find the root cause here, I guess it might be related to FS or disk
issue. Anyway we should figure out a way to fail fast in a such scenario.
> Spark's UnsafeShuffleWriter may run into infinite loop in transferTo
> occasionally
> ---------------------------------------------------------------------------------
>
> Key: SPARK-28849
> URL: https://issues.apache.org/jira/browse/SPARK-28849
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.3.1
> Reporter: Saisai Shao
> Priority: Major
> Attachments: 91ADA.png, 95330.png, D18F4.png
>
>
> Spark's {{UnsafeShuffleWriter}} may run into infinite loop when calling
> {{transferTo}} occasionally. What we saw is that when merging shuffle temp
> file, the task is hung for several hours until killed manually. Here's the
> log you can see, there's no any log after spill the shuffle files to disk.
> !95330.png!
> And here is the thread dump, we could see that it always calls native method
> {{size0}}.
> !91ADA.png!
> And we use strace to trace the system, we found that this thread is always
> calling {{fstat}}, here is the screenshot.
> !D18F4.png!
> We didn't find the root cause here, I guess it might be related to FS or disk
> issue. Anyway we should figure out a way to fail fast in a such scenario.
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