Clone Vertex on loading
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Key: GIRAPH-149
URL: https://issues.apache.org/jira/browse/GIRAPH-149
Project: Giraph
Issue Type: Bug
Components: bsp
Affects Versions: 0.1.0, 0.2.0
Reporter: Zechao Shang
Priority: Minor
AFAIK, it's a documented behavior that Hadoop io reuses instance on loading
data.
Check BspServiceWorker#readVerticesFromInputSplit, readerVertex maybe reused by
RecordReader(at least our SequenceFileVertexReader do), and must be cloned
somewhere.
In my opinion, our inherited RecordReaders should follow the behavior of
Hadoop's RecordReader, and the vertex should be cloned in
BspServiceWorker#readVerticesFromInputSplit. Just calling
org.apache.hadoop.io.WritableUtils.clone will be fine.
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