Suneel Marthi created MAHOUT-1824:
-------------------------------------
Summary: 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
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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