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https://issues.apache.org/jira/browse/DIRMINA-1039?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15428100#comment-15428100
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Emmanuel Lecharny commented on DIRMINA-1039:
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Patch applied (with slight modifications) :
http://git-wip-us.apache.org/repos/asf/mina/commit/12d45d14
Many thanks ! I must admit I was completely wrong in my first answer. This
*was* a big issue, we should never have stopped iterating on the wite loop just
because we had a empty message.
Note that the way we proceed is far from being optimal. It would be way simpler
to push a specific (and final) {{WriteRequest}} for that purpose - ie, marking
the end of a message-. For instance, having something like a static final
{{MessageEndMarker}} class, implementing {{WriteRequest}} would be simpler to
handle, and faster too (no need to create it again and again...)
> Response messages queue up on the server side waiting to be written to
> socket, while the server continues to read more request messages, causing out
> of heap memory
> -------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: DIRMINA-1039
> URL: https://issues.apache.org/jira/browse/DIRMINA-1039
> Project: MINA
> Issue Type: Bug
> Components: Core
> Reporter: Maria Petridean
> Fix For: 2.0.14
>
>
> One case in which this bug reproduces is by using a client which generates a
> heavy request-load. The mina thread which processes both reads and writes -
> exits the write cycle after processing every empty marker (the WriteRequest
> which wraps an empty buffer, acting as a message marker). This will result in
> the thread resuming the read cycle, hence reading more client request
> messages. After a few minutes, the number of read messages is much larger
> than the number of written response messages, even though the responses are
> waiting in the queue, ready to be written to socket.
> To solve this, the sever shouldn't exit the write cycle after processing
> every marker WriteRequest. This way the ratio between the read and written
> messages will be more balanced; this will avoid the heap memory getting full
> and causing server degradation.
> Also, an improvement can be considered here to avoid using the same single
> thread for both reads and writes.
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