Hassan Eslami created GIRAPH-1022:
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Summary: Out-of-core mechanism for input superstep and graph data
Key: GIRAPH-1022
URL: https://issues.apache.org/jira/browse/GIRAPH-1022
Project: Giraph
Issue Type: New Feature
Components: graph
Reporter: Hassan Eslami
Currently the out-of-core mechanism has several issues:
- It does not work properly in input superstep
- It has several bugs (correctness, and performance) for graph data structure
- It is not considering specialized message classes for out-of-core messages.
This diff addresses some of these problems, and provides a cohesive mechanism
for input superstep and graph data. With this way of doing out-of-core,
efficiently handling out-of-core messages is straightforward (will be provided
in a separate diff).
This diff provides an adaptive mechanism to remove users out of the loop for
using out-of-core. If the graph can be fit in memory, all the computation
remains in memory. If memory is very limited and GC is killing performance, or
the graph cannot fit in memory, out-of-core mechanism kicks in and helps
improve performance in many cases, and avoids application failure due to
OutOfMemory exception or it's related exceptions.
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