Clone Vertex on loading
Issue Type: Bug
Affects Versions: 0.1.0, 0.2.0
Reporter: Zechao Shang
AFAIK, it's a documented behavior that Hadoop io reuses instance on loading
Check BspServiceWorker#readVerticesFromInputSplit, readerVertex maybe reused by
RecordReader(at least our SequenceFileVertexReader do), and must be cloned
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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