A bug in LongDoubleFloatDoubleVertex.write(DataOutput out)
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Key: GIRAPH-112
URL: https://issues.apache.org/jira/browse/GIRAPH-112
Project: Giraph
Issue Type: Bug
Components: graph
Affects Versions: 0.70.0
Environment: Any
Reporter: Yuanyuan Tian
Fix For: 0.70.0
I found a bug in LongDoubleFloatDoubleVertex.write(DataOutput out) when running
a small graph algorithm. The symptom is that a vertex read from a different
worker becomes junk after the RPC communication. And the source of the problem
is the writing of the messages in LongDoubleFloatDoubleVertex.write(DataOutput
out):
for(double msg : messageList.elements()) {
out.writeDouble(msg);
}
Here messageList.elements() will returns all the elements currently stored in
the mahout DoubleArrayList, even including invalid elements between size and
capacity. Therefore, the write() function will write a bunch of invalid
messages, which will cause error when reading them back in readfields().
The following is a simple solution:
double[] elements=messageList.elements();
for(int i=0; i<messageList.size(); i++) {
out.writeDouble(elements[i]);
}
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