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Posted to dev@flink.apache.org by "Andra Lungu (JIRA)" <ji...@apache.org> on 2015/06/30 10:27:04 UTC
[jira] [Created] (FLINK-2293) Division by Zero Exception
Andra Lungu created FLINK-2293:
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Summary: Division by Zero Exception
Key: FLINK-2293
URL: https://issues.apache.org/jira/browse/FLINK-2293
Project: Flink
Issue Type: Bug
Components: Distributed Runtime
Affects Versions: 0.10
Reporter: Andra Lungu
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
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