Review Request: numFlushThreads is 0 when doing a single worker unittest. Changing the minimum to 1.

[Avery Ching <av...@gmail.com>]

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https://reviews.apache.org/r/2322/
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Review request for giraph.


Summary
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9 unittests failed due to 

java.lang.IllegalArgumentException
	at java.util.concurrent.ThreadPoolExecutor.<init>(ThreadPoolExecutor.java:589)
	at java.util.concurrent.ThreadPoolExecutor.<init>(ThreadPoolExecutor.java:480)
	at java.util.concurrent.Executors.newFixedThreadPool(Executors.java:59)
	at org.apache.giraph.comm.BasicRPCCommunications.<init>(BasicRPCCommunications.java:375)
	at org.apache.giraph.comm.RPCCommunications.<init>(RPCCommunications.java:68)
	at org.apache.giraph.graph.GraphMapper.map(GraphMapper.java:571)
	at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
	at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:763)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:369)
	at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:210)

The issue is that with only a single worker, the ThreadpoolExecutor fails because of having 0 threads as an argument.


This addresses bug GIRAPH-48.
    https://issues.apache.org/jira /browse/GIRAPH-48


Diffs
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  http://svn.apache.org/repos/asf/incubator/giraph/trunk/src/main/java/org/apache/giraph/comm/BasicRPCCommunications.java 1180785 

Diff: https://reviews.apache.org/r/2322/diff


Testing
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Passed unittests.


Thanks,

Avery