[jira] [Resolved] (SPARK-15606) Driver hang in o.a.s.DistributedSuite on 2 core machine

["Shixiong Zhu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-15606?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shixiong Zhu resolved SPARK-15606.
----------------------------------
       Resolution: Fixed
         Assignee: Pete Robbins
    Fix Version/s: 2.0.0

> Driver hang in o.a.s.DistributedSuite on 2 core machine
> -------------------------------------------------------
>
>                 Key: SPARK-15606
>                 URL: https://issues.apache.org/jira/browse/SPARK-15606
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 2.0.0
>         Environment: AMD64 box with only 2 cores
>            Reporter: Pete Robbins
>            Assignee: Pete Robbins
>             Fix For: 2.0.0
>
>
> repeatedly failing task that crashes JVM *** FAILED ***
>   The code passed to failAfter did not complete within 100000 milliseconds. (DistributedSuite.scala:128)
> This test started failing and DistrbutedSuite hanging following https://github.com/apache/spark/pull/13055
> It looks like the extra message to remove the BlockManager deadlocks as there are only 2 message processing loop threads. Related to https://issues.apache.org/jira/browse/SPARK-13906
> {code}
>   /** Thread pool used for dispatching messages. */
>   private val threadpool: ThreadPoolExecutor = {
>     val numThreads = nettyEnv.conf.getInt("spark.rpc.netty.dispatcher.numThreads",
>       math.max(2, Runtime.getRuntime.availableProcessors()))
>     val pool = ThreadUtils.newDaemonFixedThreadPool(numThreads, "dispatcher-event-loop")
>     for (i <- 0 until numThreads) {
>       pool.execute(new MessageLoop)
>     }
>     pool
>   }
> {code} 
> Setting a minimum of 3 threads alleviates this issue but I'm not sure there isn't another underlying problem.



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