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https://issues.apache.org/activemq/browse/AMQ-2837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=60769#action_60769
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Sebastien Rodriguez commented on AMQ-2837:
------------------------------------------
This is actually not an issue.
Check
http://activemq.apache.org/kahadb.html (see the bottom: Slow KahaDB access log
messages)
You can tune the value with your hard drive speed.
> Slow KahaDB
> -----------
>
> Key: AMQ-2837
> URL: https://issues.apache.org/activemq/browse/AMQ-2837
> Project: ActiveMQ
> Issue Type: Bug
> Components: Broker
> Affects Versions: 5.3.2
> Environment: Linux
> Reporter: Andy
>
> I'm using KahaDB for persistence with the following configuration:
> <?xml version="1.0" encoding="UTF-8"?>
> <beans>
> <broker brokerName="test-broker"
> persistent="true"
> useJmx="true"
> useShutdownHook="false"
> deleteAllMessagesOnStartup="false"
> xmlns="http://activemq.apache.org/schema/core";>
> <persistenceAdapter>
> <kahaDB directory="activemq-data" journalMaxFileLength="32mb"
> indexCacheSize="10000000
> "/>
> </persistenceAdapter>
> <transportConnectors>
> <transportConnector uri="tcp://localhost:61616"/>
> </transportConnectors>
> <destinationPolicy>
> <policyMap>
> <policyEntries>
> <policyEntry topic=">">
> <subscriptionRecoveryPolicy>
> <timedSubscriptionRecoveryPolicy recoverDuration="3600000"/>
> </subscriptionRecoveryPolicy>
> </policyEntry>
> </policyEntries>
> </policyMap>
> </destinationPolicy>
> </broker>
> </beans>
> I've some durable consumers. The broker is showing many "Slow KahaDB access"
> log entries.
> Any suggestions?
> INFO | Slow KahaDB access: Journal append took: 0 ms, Index update took 1248
> ms
> INFO | Slow KahaDB access: Journal append took: 0 ms, Index update took 1560
> ms
> INFO | Slow KahaDB access: Journal append took: 1 ms, Index update took 1227
> ms
> INFO | Slow KahaDB access: Journal append took: 0 ms, Index update took 1227
> ms
> INFO | Slow KahaDB access: Journal append took: 1480 ms, Index update took 0
> ms
> INFO | Slow KahaDB access: Journal append took: 5 ms, Index update took 1302
> ms
> INFO | Slow KahaDB access: Journal append took: 0 ms, Index update took 1302
> ms
> INFO | Slow KahaDB access: Journal append took: 13 ms, Index update took
> 1348 ms
> INFO | Slow KahaDB access: Journal append took: 0 ms, Index update took 1590
> ms
> INFO | Slow KahaDB access: Journal append took: 1327 ms, Index update took 0
> ms
> INFO | Slow KahaDB access: Journal append took: 0 ms, Index update took 1263
> ms
> INFO | Slow KahaDB access: Journal append took: 1 ms, Index update took 1276
> ms
> INFO | Slow KahaDB access: Journal append took: 0 ms, Index update took 1277
> ms
> INFO | Slow KahaDB access: Journal append took: 0 ms, Index update took 1318
> ms
> INFO | Slow KahaDB access: Journal append took: 0 ms, Index update took 1312
> ms
> INFO | Slow KahaDB access: Journal append took: 0 ms, Index update took 1593
> ms
> INFO | Slow KahaDB access: Journal append took: 3 ms, Index update took 1608
> ms
> INFO | Slow KahaDB access: Journal append took: 0 ms, Index update took 1302
> ms
> INFO | Slow KahaDB access: Journal append took: 3 ms, Index update took 1317
> ms
> INFO | Slow KahaDB access: Journal append took: 0 ms, Index update took 1318
> ms
> INFO | Slow KahaDB access: Journal append took: 2 ms, Index update took 1316
> ms
> INFO | Slow KahaDB access: Journal append took: 1318 ms, Index update took 1
> ms
> INFO | Slow KahaDB access: Journal append took: 0 ms, Index update took 1296
> ms
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