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From Fabian Hueske <fhue...@gmail.com>
Subject Re: [Runtime] Division by Zero Exception
Date Tue, 30 Jun 2015 08:22:40 GMT
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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