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From Tony Wei <tony19920...@gmail.com>
Subject Stream Task seems to be blocked after checkpoint timeout
Date Tue, 26 Sep 2017 15:08:44 GMT

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.)

[image: 內置圖片 1]

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 stopped.

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

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