anselme dewavrin created AMQ-4987:
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Summary: 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
Dear all,
I set up a 3-nodes replicatedLevelDB activeMQ cluster as explained on the
activemq site.
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 600
messages/s).
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.
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 ?
Many thanks in advance
Yours,
Anselme
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