[jira] [Created] (FLINK-15013) Flink (on YARN) sometimes needs too many slots

[Shang Yuanchun (Jira)]

Aljoscha Krettek created FLINK-15013:
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             Summary: Flink (on YARN) sometimes needs too many slots
                 Key: FLINK-15013
                 URL: https://issues.apache.org/jira/browse/FLINK-15013
             Project: Flink
          Issue Type: Bug
          Components: Runtime / Coordination
    Affects Versions: 1.10.0
            Reporter: Aljoscha Krettek
             Fix For: 1.10.0
         Attachments: DualInputWordCount.jar

*THIS IS DIFFERENT FROM FLINK-15007, even though the text looks almost the same.*

This was discovered while debugging FLINK-14834. In some cases a Flink needs needs more slots to execute than expected. You can see this in some of the logs attached to FLINK-14834.

You can reproduce this using [https://github.com/aljoscha/docker-hadoop-cluster] to bring up a YARN cluster and then running a compiled Flink in there.

When you run
{code:java}
bin/flink run -m yarn-cluster -p 3 -yjm 1224 -ytm 1224 /root/DualInputWordCount.jar --input hdfs:///wc-in-1 --output hdfs:///wc-out && hdfs dfs -rm -r /wc-out
{code}
and check the logs afterwards you will sometimes see three "Requesting new slot..." statements and sometimes you will see four.

This is the {{git bisect}} log that identifies the first faulty commit ([https://github.com/apache/flink/commit/2ab8b61f2f22f1a1ce7f92cd6b8dd32d2c0c227d|https://github.com/apache/flink/commit/2ab8b61f2f22f1a1ce7f92cd6b8dd32d2c0c227d]):
{code:java}
git bisect start
# good: [09f2f43a1d73c76bf4d3f4a1205269eb860deb14] [FLINK-14154][ml] Add the class for multivariate Gaussian Distribution.
git bisect good 09f2f43a1d73c76bf4d3f4a1205269eb860deb14
# bad: [01d6972ab267807b8afccb09a45c454fa76d6c4b] [hotfix] Refactor out slots creation from the TaskSlotTable constructor
git bisect bad 01d6972ab267807b8afccb09a45c454fa76d6c4b
# bad: [7a61c582c7213f123e10de4fd11a13d96425fd77] [hotfix] Fix wrong Java doc comment of BroadcastStateBootstrapFunction.Context
git bisect bad 7a61c582c7213f123e10de4fd11a13d96425fd77
# good: [edeec8d7420185d1c49b2739827bd921d2c2d485] [hotfix][runtime] Replace all occurrences of letter to mail to unify wording of variables and documentation.
git bisect good edeec8d7420185d1c49b2739827bd921d2c2d485
# bad: [1b4ebce86b71d56f44185f1cb83d9a3b51de13df] [FLINK-14262][table-planner-blink] support referencing function with fully/partially qualified names in blink
git bisect bad 1b4ebce86b71d56f44185f1cb83d9a3b51de13df
# good: [25a3d9138cd5e39fc786315682586b75d8ac86ea] [hotfix] Move TaskManagerSlot to o.a.f.runtime.resourcemanager.slotmanager
git bisect good 25a3d9138cd5e39fc786315682586b75d8ac86ea
# good: [362d7670593adc2e4b20650c8854398727d8102b] [FLINK-12122] Calculate TaskExecutorUtilization when listing available slots
git bisect good 362d7670593adc2e4b20650c8854398727d8102b
# bad: [7e8218515baf630e668348a68ff051dfa49c90c3] [FLINK-13969][Checkpointing] Do not allow trigger new checkpoitn after stop the coordinator
git bisect bad 7e8218515baf630e668348a68ff051dfa49c90c3
# bad: [269e7f007e855c2bdedf8bad64ef13f516a608a6] [FLINK-12122] Choose SlotSelectionStrategy based on ClusterOptions#EVENLY_SPREAD_OUT_SLOTS_STRATEGY
git bisect bad 269e7f007e855c2bdedf8bad64ef13f516a608a6
# bad: [2ab8b61f2f22f1a1ce7f92cd6b8dd32d2c0c227d] [FLINK-12122] Add EvenlySpreadOutLocationPreferenceSlotSelectionStrategy
git bisect bad 2ab8b61f2f22f1a1ce7f92cd6b8dd32d2c0c227d
# first bad commit: [2ab8b61f2f22f1a1ce7f92cd6b8dd32d2c0c227d] [FLINK-12122] Add EvenlySpreadOutLocationPreferenceSlotSelectionStrategy
{code}

I'm using the streaming WordCount example that I modified to have two "inputs", similar to how the WordCount example is used in the YARN/kerberos/Docker test. Instead of using the input once we use it like this:
{code}
text = env.readTextFile(params.get("input")).union(env.readTextFile(params.get("input")));
{code}
to create two inputs from the same path. A jar is attached.



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