[jira] [Created] (SPARK-12554) Standalone app scheduler will hang when app.coreToAssign < minCoresPerExecutor

["Lijie Xu (JIRA)" <ji...@apache.org>]

Lijie Xu created SPARK-12554:
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             Summary: Standalone app scheduler will hang when app.coreToAssign < minCoresPerExecutor
                 Key: SPARK-12554
                 URL: https://issues.apache.org/jira/browse/SPARK-12554
             Project: Spark
          Issue Type: Bug
          Components: Deploy, Scheduler
    Affects Versions: 1.5.2
            Reporter: Lijie Xu
            Priority: Critical


In scheduleExecutorsOnWorker() in Master.scala,
*val keepScheduling = coresToAssign >= minCoresPerExecutor* should be changed to *val keepScheduling = coresToAssign > 0*

Suppose that an app's requested cores is 10 (i.e., spark.cores.max = 10) and app.coresPerExecutor is 4 (i.e., spark.executor.cores = 4). 

After allocating two executors (each has 4 cores) to the app, the *coresToAssign = 2* and *minCoresPerExecutor = coresPerExecutor = 4*, so *keepScheduling = false* and no extra executor will be allocated to the app. As a result, the app and the scheduler will hang.





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