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From "Maximilian Michels (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-4296) Scheduler accepts more tasks than it has task slots available
Date Mon, 01 Aug 2016 13:32:20 GMT
Maximilian Michels created FLINK-4296:
-----------------------------------------

             Summary: Scheduler accepts more tasks than it has task slots available
                 Key: FLINK-4296
                 URL: https://issues.apache.org/jira/browse/FLINK-4296
             Project: Flink
          Issue Type: Bug
          Components: JobManager, TaskManager
    Affects Versions: 1.1.0
            Reporter: Maximilian Michels
            Priority: Critical
             Fix For: 1.1.0, 1.2.0


Flink's scheduler doesn't support queued scheduling but expects to find all necessary task
slots upon scheduling. If it does not it throws an error. Due to some changes in the latest
master, this seems to be broken.

Flink accepts jobs with {{parallelism > total number of task slots}}, schedules and deploys
tasks in all available task slots, and leaves the remaining tasks lingering forever.

Easy to reproduce: 
{code}
./bin/flink run -p TASK_SLOTS+n
{code} 

where {{TASK_SLOTS}} is the number of total task slots of the cluster and {{n>=1}}.

Here, {{p=11}}, {{TASK_SLOTS=10}}:

{noformat}
Cluster configuration: Standalone cluster with JobManager at localhost/127.0.0.1:6123
Using address localhost:6123 to connect to JobManager.
JobManager web interface address http://localhost:8081
Starting execution of program
Executing EnumTriangles example with default edges data set.
Use --edges to specify file input.
Printing result to stdout. Use --output to specify output path.
Submitting job with JobID: cd0c0b4cbe25643d8d92558168cfc045. Waiting for job completion.
08/01/2016 12:12:12     Job execution switched to status RUNNING.
08/01/2016 12:12:12     CHAIN DataSource (at getDefaultEdgeDataSet(EnumTrianglesData.java:57)
(org.apache.flink.api.java.io.CollectionInputFormat)) -> Map (Map at main(EnumTriangles.java:108))(1/1)
switched to SCHEDULED
08/01/2016 12:12:12     CHAIN DataSource (at getDefaultEdgeDataSet(EnumTrianglesData.java:57)
(org.apache.flink.api.java.io.CollectionInputFormat)) -> Map (Map at main(EnumTriangles.java:108))(1/1)
switched to DEPLOYING
08/01/2016 12:12:12     CHAIN DataSource (at getDefaultEdgeDataSet(EnumTrianglesData.java:57)
(org.apache.flink.api.java.io.CollectionInputFormat)) -> Map (Map at main(EnumTriangles.java:108))(1/1)
switched to RUNNING
08/01/2016 12:12:12     CHAIN DataSource (at getDefaultEdgeDataSet(EnumTrianglesData.java:57)
(org.apache.flink.api.java.io.CollectionInputFormat)) -> Map (Map at main(EnumTriangles.java:108))(1/1)
switched to FINISHED
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(1/11) switched
to SCHEDULED
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(3/11) switched
to SCHEDULED
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(2/11) switched
to SCHEDULED
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(7/11) switched
to SCHEDULED
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(7/11) switched
to DEPLOYING
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(6/11) switched
to SCHEDULED
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(4/11) switched
to SCHEDULED
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(5/11) switched
to SCHEDULED
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(4/11) switched
to DEPLOYING
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(3/11) switched
to DEPLOYING
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(9/11) switched
to SCHEDULED
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(9/11) switched
to DEPLOYING
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(5/11) switched
to DEPLOYING
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(1/11) switched
to DEPLOYING
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(1/11) switched to SCHEDULED
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(1/11) switched to DEPLOYING
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(2/11) switched to SCHEDULED
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(2/11) switched to DEPLOYING
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(3/11) switched to SCHEDULED
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(3/11) switched to DEPLOYING
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(4/11) switched to SCHEDULED
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(4/11) switched to DEPLOYING
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(5/11) switched to SCHEDULED
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(5/11) switched to DEPLOYING
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(6/11) switched to SCHEDULED
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(6/11) switched to DEPLOYING
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(7/11) switched to SCHEDULED
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(7/11) switched to DEPLOYING
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(8/11) switched to SCHEDULED
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(8/11) switched to DEPLOYING
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(9/11) switched to SCHEDULED
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(9/11) switched to DEPLOYING
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(10/11) switched to SCHEDULED
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(10/11) switched to DEPLOYING
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(11/11) switched
to SCHEDULED
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(10/11) switched
to SCHEDULED
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(11/11) switched
to DEPLOYING
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(10/11) switched
to DEPLOYING
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(8/11) switched
to SCHEDULED
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(6/11) switched
to DEPLOYING
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(2/11) switched
to DEPLOYING
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(3/11) switched
to RUNNING
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(11/11) switched to SCHEDULED
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(1/11) switched
to RUNNING
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(1/11) switched to RUNNING
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(2/11) switched to RUNNING
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(3/11) switched to RUNNING
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(9/11) switched
to RUNNING
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(4/11) switched
to RUNNING
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(5/11) switched
to RUNNING
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(7/11) switched to RUNNING
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(6/11) switched to RUNNING
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(8/11) switched to RUNNING
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(9/11) switched to RUNNING
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(10/11) switched to RUNNING
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(10/11) switched
to RUNNING
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(11/11) switched
to RUNNING
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(4/11) switched to RUNNING
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(5/11) switched to RUNNING
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(7/11) switched
to RUNNING
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(2/11) switched
to RUNNING
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(6/11) switched
to RUNNING
08/01/2016 12:12:13     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(1/11) switched
to FINISHED
08/01/2016 12:12:13     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(2/11) switched
to FINISHED
08/01/2016 12:12:13     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(7/11) switched
to FINISHED
08/01/2016 12:12:13     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(6/11) switched
to FINISHED
08/01/2016 12:12:13     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(3/11) switched
to FINISHED
08/01/2016 12:12:13     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(9/11) switched
to FINISHED
08/01/2016 12:12:13     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(11/11) switched
to FINISHED
08/01/2016 12:12:13     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(5/11) switched
to FINISHED
08/01/2016 12:12:13     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(10/11) switched
to FINISHED
08/01/2016 12:12:13     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(4/11) switched
to FINISHED
{noformat}

For {{8/11}}, the {{Join}} task switches to RUNNING, but the {{GroupReduce}} does not:
{noformat}
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(8/11) switched to SCHEDULED
08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(8/11) switched to DEPLOYING
....
08/01/2016 12:12:12     GroupReduce (GroupReduce at main(EnumTriangles.java:112))(8/11) switched
to SCHEDULED
....
{08/01/2016 12:12:12     Join(Join at main(EnumTriangles.java:114))(8/11) switched to RUNNING}}
{noformat}



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