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From "Jakub Scholz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (QPID-6730) Make the journal flush timeout configurable in the C++ broker
Date Mon, 14 Sep 2015 20:35:47 GMT

    [ https://issues.apache.org/jira/browse/QPID-6730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14744212#comment-14744212
] 

Jakub Scholz commented on QPID-6730:
------------------------------------

Thanks for this change. I gave it a try and it seems to work nicely - it helps with the issue
with synchronous message producers. When tested with Qpid JMS client with ~1kB messages, it
scaled from 1msg/s with default values up to somewhere around 400 msg/s with the flush timeout
set to 0.1 ms (running on my old laptop - for comparison asynchronous producer is able to
run around 6000 msg/s).

I noticed only two very minor issues - setting the value to 0 results and an error loop ("[System]
error JournalInactive:TplStore couldn't setup next timer firing: 118.467ms[0ns]"). Also, I
would expect that the values usually used would be rather in milliseconds and not in seconds.
Setting the value to 0.001 (aka 1ms) works fine, but it looks strange.

> Make the journal flush timeout configurable in the C++ broker
> -------------------------------------------------------------
>
>                 Key: QPID-6730
>                 URL: https://issues.apache.org/jira/browse/QPID-6730
>             Project: Qpid
>          Issue Type: Improvement
>          Components: C++ Broker
>    Affects Versions: qpid-cpp-0.34
>            Reporter: Michael Cressman
>            Assignee: Andrew Stitcher
>            Priority: Minor
>             Fix For: qpid-cpp-next
>
>
> Linear store does not flush the buffer often enough for synchronous durable messages.
 Make the journal flush timeout configurable so users can tune performance by changing this
setting.



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