[jira] [Commented] (GIRAPH-1027) Improve flow-control on sender side

["Hassan Eslami (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/GIRAPH-1027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15225292#comment-15225292 ] 

Hassan Eslami commented on GIRAPH-1027:
---------------------------------------

Thanks Dionysios and Maja for reviewing and committing the diff.

> Improve flow-control on sender side
> -----------------------------------
>
>                 Key: GIRAPH-1027
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-1027
>             Project: Giraph
>          Issue Type: Improvement
>          Components: graph
>            Reporter: Hassan Eslami
>            Assignee: Hassan Eslami
>
> Currently, a sender worker will keep all open requests (and optionally up to a certain number of total open requests) in its own memory. This behavior may cause high memory usage in sender side. Also, since messages can arrive to a worker at an arbitrary rate, receiver may not have the ability to handle all incoming messages, hence we may see a large memory footprint in receiver as well. This diff addresses the problem by limiting the number of open requests per worker in sender side. Also, it provides a cache of unsent requests on sender in case the sender already sent enough messages to another worker but has not received any response back.



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