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https://issues.apache.org/activemq/browse/AMQ-2837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=60822#action_60822
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Gary Tully edited comment on AMQ-2837 at 10/11/10 3:28 PM:
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There is a utility in the distribution that can help you determine relative
disk speed as experienced by the journal writer thread:
{code}java -classpath lib/kahadb-<version>.jar
org.apache.kahadb.util.DiskBenchmark{code}
As to the value of the log threshold, the calculation is a simple time
difference before and after the journal and index update, there is no
complicated formula and it really is there as a development aid. So pick a
large value if you have a slow disk and don't want to see the log entry.
Otherwise you will be regularly reminded of the fact.
was (Author: gtully):
There is a utility in the distribution that can help you determine relative
disk speed as experienced by the journal writer thread:
java -classpath lib/kahadb-<version>.jar org.apache.kahadb.util.DiskBenchmark
As to the value of the log threshold, the calculation is a simple time
difference before and after the journal and index update, there is no
complicated formula and it really is there as a development aid. So pick a
large value if you have a slow disk and don't want to see the log entry.
Otherwise you will be regularly reminded of the fact.
> 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
> Assignee: Rob Davies
>
> 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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