[jira] [Resolved] (MAHOUT-1824) Optimize FlinkOpAtA to use upper triangular matrices

["Suneel Marthi (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAHOUT-1824?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Suneel Marthi resolved MAHOUT-1824.
-----------------------------------
    Resolution: Implemented

> Optimize FlinkOpAtA to use upper triangular matrices 
> -----------------------------------------------------
>
>                 Key: MAHOUT-1824
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1824
>             Project: Mahout
>          Issue Type: Bug
>          Components: Flink
>    Affects Versions: 0.11.2
>            Reporter: Suneel Marthi
>            Assignee: Suneel Marthi
>              Labels: performance
>             Fix For: 0.12.0
>
>
> Optimize FlinkOpAtA to use upper triangular matrices (similar to what's being done in Spark backend).  
> Presently dals fails on FlinkOpAtA computation with an OOM
> {Code}
> 57766 [flink-akka.actor.default-dispatcher-5] ERROR akka.actor.ActorSystemImpl  - exception on LARS’ timer thread
> java.lang.OutOfMemoryError: GC overhead limit exceeded
> 57770 [flink-akka.actor.default-dispatcher-5] ERROR akka.actor.ActorSystemImpl  - Uncaught fatal error from thread [flink-scheduler-1] shutting down ActorSystem [flink]
> java.lang.OutOfMemoryError: GC overhead limit exceeded
> - dals *** FAILED ***
>   org.apache.flink.runtime.client.JobTimeoutException: Timeout while waiting for JobManager answer. Job time exceeded 21474835 seconds
>   at org.apache.flink.runtime.client.JobClient.submitJobAndWait(JobClient.java:136)
>   at org.apache.flink.runtime.minicluster.FlinkMiniCluster.submitJobAndWait(FlinkMiniCluster.scala:423)
>   at org.apache.flink.runtime.minicluster.FlinkMiniCluster.submitJobAndWait(FlinkMiniCluster.scala:409)
>   at org.apache.flink.runtime.minicluster.FlinkMiniCluster.submitJobAndWait(FlinkMiniCluster.scala:401)
>   at org.apache.flink.client.LocalExecutor.executePlan(LocalExecutor.java:190)
>   at org.apache.flink.api.java.LocalEnvironment.execute(LocalEnvironment.java:90)
>   at org.apache.flink.api.java.ExecutionEnvironment.execute(ExecutionEnvironment.java:855)
>   at org.apache.flink.api.scala.ExecutionEnvironment.execute(ExecutionEnvironment.scala:638)
>   at org.apache.flink.api.scala.DataSet.collect(DataSet.scala:546)
>   at org.apache.mahout.flinkbindings.blas.FlinkOpAtA$.slim(FlinkOpAtA.scala:53)
>   ...
>   Cause: akka.pattern.AskTimeoutException: Ask timed out on [Actor[akka://flink/user/$a#372851579]] after [21474835000 ms]
>   at akka.pattern.PromiseActorRef$$anonfun$1.apply$mcV$sp(AskSupport.scala:333)
>   at akka.actor.Scheduler$$anon$7.run(Scheduler.scala:117)
>   at akka.actor.LightArrayRevolverScheduler$TaskHolder.run(Scheduler.scala:476)
>   at akka.actor.LightArrayRevolverScheduler$$anonfun$close$1.apply(Scheduler.scala:282)
>   at akka.actor.LightArrayRevolverScheduler$$anonfun$close$1.apply(Scheduler.scala:281)
>   at scala.collection.Iterator$class.foreach(Iterator.scala:727)
>   at scala.collection.AbstractIterator.foreach(Iterator.scala:1157)
>   at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
>   at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
>   at akka.actor.LightArrayRevolverScheduler.close(Scheduler.scala:280)
> {Code}



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