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From Andra Lungu <lungu.an...@gmail.com>
Subject Re: [Runtime] Division by Zero Exception
Date Tue, 30 Jun 2015 08:27:39 GMT
Sure! FLINK-2293

On Tue, Jun 30, 2015 at 10:22 AM, Fabian Hueske <fhueske@gmail.com> wrote:

> That looks like a serious bug. :-(
> Can you open a JIRA for that?
>
> Thanks, Fabian
>
> 2015-06-29 23:24 GMT+02:00 Andra Lungu <lungu.andra@gmail.com>:
>
> > From the same series of experiments:
> >
> > I am basically running an algorithm that simulates a Gather Sum Apply
> > Iteration that performs Traingle Count (Why simulate it? Because you just
> > need a superstep -> useless overhead if you use the runGatherSumApply
> > function in Graph).
> > What happens, at a high level:
> > 1). Select neighbors with ID greater than the one corresponding to the
> > current vertex;
> > 2). Propagate the received values to neighbors with higher ID;
> > 3). compute the number of triangles by checking whether
> >
> > trgVertex.getValue().get(srcVertex.getId());
> >
> > *As you can see, I *do not* perform any division at all;*
> > code is here:
> >
> >
> https://github.com/andralungu/gelly-partitioning/blob/master/src/main/java/example/GSATriangleCount.java
> >
> > Now for small graphs, 50MB max, the computation finishes nicely with the
> > correct result. For a 10GB graph, however, I got this:
> >
> > java.lang.ArithmeticException: / by zero
> >     at
> >
> >
> org.apache.flink.runtime.operators.hash.MutableHashTable.insertIntoTable(MutableHashTable.java:836)
> >     at
> >
> >
> org.apache.flink.runtime.operators.hash.MutableHashTable.buildTableFromSpilledPartition(MutableHashTable.java:819)
> >     at
> >
> >
> org.apache.flink.runtime.operators.hash.MutableHashTable.prepareNextPartition(MutableHashTable.java:508)
> >     at
> >
> >
> org.apache.flink.runtime.operators.hash.MutableHashTable.nextRecord(MutableHashTable.java:544)
> >     at
> >
> >
> org.apache.flink.runtime.operators.hash.NonReusingBuildFirstHashMatchIterator.callWithNextKey(NonReusingBuildFirstHashMatchIterator.java:104)
> >     at
> > org.apache.flink.runtime.operators.MatchDriver.run(MatchDriver.java:173)
> >     at
> >
> >
> org.apache.flink.runtime.operators.RegularPactTask.run(RegularPactTask.java:496)
> >     at
> >
> >
> org.apache.flink.runtime.operators.RegularPactTask.invoke(RegularPactTask.java:362)
> >     at org.apache.flink.runtime.taskmanager.Task.run(Task.java:559)
> >     at java.lang.Thread.run(Thread.java:722)
> >
> > see the full log here:
> > https://gist.github.com/andralungu/984774f6348269df7951
> >
> > Could you help me detect the cause of this?
> >
> > Thanks!
> > Andra
> >
>

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