Sergey Edunov created GIRAPH-1070:
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Summary: Comparators in PartitionUtils can overflow
Key: GIRAPH-1070
URL: https://issues.apache.org/jira/browse/GIRAPH-1070
Project: Giraph
Issue Type: Bug
Reporter: Sergey Edunov
Assignee: Sergey Edunov
We see this exception in the logs:
ERROR 2016-06-10 16:12:20,635 [org.apache.giraph.master.MasterThread]
org.apache.giraph.master.MasterThread - masterThread: Master algorithm failed
with IllegalArgumentException
java.lang.IllegalArgumentException: Comparison method violates its general
contract!
at java.util.TimSort.mergeHi(TimSort.java:899)
at java.util.TimSort.mergeAt(TimSort.java:516)
at java.util.TimSort.mergeCollapse(TimSort.java:439)
at java.util.TimSort.sort(TimSort.java:245)
at java.util.Arrays.sort(Arrays.java:1512)
at java.util.ArrayList.sort(ArrayList.java:1454)
at java.util.Collections.sort(Collections.java:175)
at
org.apache.giraph.partition.PartitionUtils.analyzePartitionStats(PartitionUtils.java:159)
at
org.apache.giraph.master.BspServiceMaster.assignPartitionOwners(BspServiceMaster.java:1109)
at
org.apache.giraph.master.BspServiceMaster.coordinateSuperstep(BspServiceMaster.java:1581)
at org.apache.giraph.master.MasterThread.run(MasterThread.java:124)
One of the possible reasons, is overflow in comparator. Let's fix it.
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