Seong-il Lee created GIRAPH-942:
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Summary: RexsterUtils drops some data when it reads data from
Titan DB
Key: GIRAPH-942
URL: https://issues.apache.org/jira/browse/GIRAPH-942
Project: Giraph
Issue Type: Bug
Environment: - Ubuntu 12.04
- Hadoop 1.2.1
- Giraph trunk
- Titan 0.4.4
Reporter: Seong-il Lee
Priority: Minor
Attachments: GIRAPH-942.patch
*Problem:*
When Giraph reads data from Titan DB via RexsterUtils.
Giraph can't read whole data from TitanDB.
*Reason:*
RexsterUtils split the data to chunk as many as number of map tasks.
But Giraph use map tasks - 1 workers (one for master), except
SplitMasterWorker=false option used.
So, Giraph drop some data as much as a chunk.
*Solution:*
I modified code for RexsterUtils.java
- before
chunks : number of map tasks
- after
chunks : number of available workers
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