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https://issues.apache.org/jira/browse/GIRAPH-1027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14662203#comment-14662203
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Hassan Eslami commented on GIRAPH-1027:
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Code review discussion: reviews.facebook.net/D43797
> 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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