Eli Reisman created GIRAPH-307:
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Summary: InputSplit list can be long with many workers (and
locality info) and should not be re-created every time a worker calls
reserveInputSplit()
Key: GIRAPH-307
URL: https://issues.apache.org/jira/browse/GIRAPH-307
Project: Giraph
Issue Type: Improvement
Components: bsp, graph
Affects Versions: 0.2.0
Reporter: Eli Reisman
Assignee: Eli Reisman
Priority: Minor
Fix For: 0.2.0
While instrumenting the INPUT_SUPERSTEP and watching various runs, I see the
input split list generated every time a worker calls reserveInputSplit is, for
all intents and purposes, immutable per job. Therefore, we can save a fair
amount of memory by not re-creating the list and re-querying ZooKeeper on each
pass to claim another split. Only the reserved and finished children lists are
ever mutated during the input phase of the job.
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