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From Stefan Richter <s.rich...@data-artisans.com>
Subject Re: Stream Task seems to be blocked after checkpoint timeout
Date Tue, 26 Sep 2017 15:46:07 GMT

that is very strange indeed. I had a look at the logs and there is no error or exception reported.
I assume there is also no exception in your full logs? Which version of flink are you using
and what operators were running in the task that stopped? If this happens again, would it
be possible to take a thread dump from that JVM?


> Am 26.09.2017 um 17:08 schrieb Tony Wei <tony19920430@gmail.com>:
> Hi,
> Something weird happened on my streaming job.
> I found my streaming job seems to be blocked for a long time and I saw the situation
like the picture below. (chk #1245 and #1246 were all finishing 7/8 tasks then marked timeout
by JM. Other checkpoints failed with the same state like #1247 util I restarted TM.)
> <snapshot.png>
> I'm not sure what happened, but the consumer stopped fetching records, buffer usage is
100% and the following task did not seem to fetch data anymore. Just like the whole TM was
> However, after I restarted TM and force the job restarting from the latest completed
checkpoint, everything worked again. And I don't know how to reproduce it.
> The attachment is my TM log. Because there are many user logs and sensitive information,
I only remain the log from `org.apache.flink...`.
> My cluster setting is one JM and one TM with 4 available slots.
> Streaming job uses all slots, checkpoint interval is 5 mins and max concurrent number
is 3.
> Please let me know if it needs more information to find out what happened on my streaming
job. Thanks for your help.
> Best Regards,
> Tony Wei
> <flink-root-taskmanager-0-partial.log>

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