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From "Hassan Eslami (JIRA)" <j...@apache.org>
Subject [jira] [Created] (GIRAPH-1022) Out-of-core mechanism for input superstep and graph data
Date Mon, 27 Jul 2015 17:32:04 GMT
Hassan Eslami created GIRAPH-1022:
-------------------------------------

             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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