Hassan Eslami created GIRAPH-1019:
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Summary: Optimizing and debugging vertex mutation
Key: GIRAPH-1019
URL: https://issues.apache.org/jira/browse/GIRAPH-1019
Project: Giraph
Issue Type: Improvement
Components: graph
Reporter: Hassan Eslami
Currently vertex mutations happen while preparing a superstep execution in a
single-threaded manner. This is extremely inefficient specially for the case of
out-of-core as we have to go over all the partitions, load them, and test if
they have any applicable mutation. Also, there is an unexpected behavior in
cases where a mutation happen to a vertex and some messages being delivered to
that vertex at the same time (current implementation fails the job in that
case).
In order to fix/optimize this, mutations should happen in a multi-threaded
fashion right before start of processing of a partition. Also, while partition
migration happens, mutation requests should migrate along with the partition
and its messages.
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