>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
