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Date: Mon, 11 Oct 2010 15:29:40 -0400 (EDT)
From: "Gary Tully (JIRA)" <jira@apache.org>
To: dev@activemq.apache.org
Subject: [jira] Issue Comment Edited: (AMQ-2837) Slow KahaDB
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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 ] 

Gary Tully edited comment on AMQ-2837 at 10/11/10 3:28 PM:
-----------------------------------------------------------

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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