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List:       activemq-dev
Subject:    [jira] [Commented] (AMQ-4987) io wait on replicated levelDB slaves
From:       "anselme dewavrin (JIRA)" <jira () apache ! org>
Date:       2014-06-30 14:13:24
Message-ID: JIRA.12690266.1390397406949.73303.1404137604672 () arcas
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    [ https://issues.apache.org/jira/browse/AMQ-4987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14047684#comment-14047684 \
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anselme dewavrin commented on AMQ-4987:
---------------------------------------

still up and running in production.

> io wait on replicated levelDB slaves
> ------------------------------------
> 
> Key: AMQ-4987
> URL: https://issues.apache.org/jira/browse/AMQ-4987
> Project: ActiveMQ
> Issue Type: Test
> Components: activemq-leveldb-store
> Affects Versions: 5.9.0
> Environment: debian VM 2.6.32-5-amd64, jdk7
> Reporter: anselme dewavrin
> Priority: Minor
> Fix For: 5.9.0
> 
> 
> Dear all,
> I set up a 3-nodes replicatedLevelDB activeMQ cluster on 3 different machines, as \
> explained on the activemq site (with zookeeper etc.). I made a message injector \
> using the php stomp client described here : \
> http://stomp.fusesource.org/documentation/php/book.html Then I injected persistent \
> messages as fast as possible (giving about 100 messages/s, each message is 10k). \
> Everything works fine, then I measured the servers' activity with "vmstat 1". I saw \
> no iowait on the master node, but  20% on both slaves. This would impeach \
> scalabitity I suppose. And the iowait is justified by 3000 bo/s (blocks out) in the \
> vmstat report. The machines are not swapping (paging).
> Here is what I tried, without success :
> -specify explicitly sync="quorum_mem"
> -JNI implementation of the leveldb store (and verified it is used)
> -setting flushDelay to 2000
> Does anyone have an idea that I could try ? Why is the leveldb slaves writing so \
> much to disk ? Many thanks in advance
> Yours,
> Anselme



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