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From "Torsten Mielke (Confluence)" <conflue...@apache.org>
Subject [CONF] Apache ActiveMQ > Why do KahaDB log files remain after cleanup?
Date Thu, 11 Dec 2014 13:56:00 GMT
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                                                            <a href="    https://cwiki.apache.org/confluence/display/~tmielke
" style="color:#326ca6;text-decoration:none;; color: #326ca6; text-decoration: none">Torsten
Mielke</a> edited the page:
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<strong style="font-size:16px;line-height:20px;vertical-align:top;">Why do KahaDB log
files remain after cleanup?</strong> </a> </h2> </td>
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<b>Comment:</b> Adding logging configuration to see details of temp storage cleanup.
</p>
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                                                    <p class="diff-context-placeholder"
style="font-size: 13px">...</p>
                                                    <p class="diff-block-context" style="font-size:
13px">We get one candidate, data-87.log from the existing set of journal data files <code
style="font-size: 13px">[86, 87, 163, 164]</code>. There is a current transaction
using 164, destination (Queue named E) <code style="font-size: 13px">'0\:E'</code>
has some messages in 163, destination <code style="font-size: 13px">'0:I'</code>
has messages in 86 and 87 is unreferenced. In this case, there must be some long standing
unacked messages or a very slow consumer on destination <code style="font-size: 13px">'0:I'</code>.<br
/> The <code style="font-size: 13px">'0:'</code> prefix is shorthand for a
queue, <code style="font-size: 13px">'1:'</code> for a topic, i.e: <code style="font-size:
13px">dest:1:B</code> is a topic named B.</p>
                                                    <p class="diff-block-target diff-block-context"
style="font-size: 13px"> <span class="diff-html-added" id="added-diff-0" style="font-size:
100%; background-color: #ddfade;">&nbsp;</span> </p>
                                                    <p class="diff-block-target diff-block-context"
style="font-size: 13px"> <span class="diff-html-added" style="font-size: 100%; background-color:
#ddfade;">&nbsp;</span> </p>
                                                    <p class="diff-context-placeholder"
style="font-size: 13px">...</p>
                                                    <h3 id="WhydoKahaDBlogfilesremainaftercleanup?-Non-persistentmessages"
class="diff-block-target diff-block-context"> <span class="diff-html-added" style="font-size:
100%; background-color: #ddfade;">Non-persistent messages</span> </h3>
                                                    <p class="diff-block-target diff-block-context"
style="font-size: 13px"> <span class="diff-html-added" style="font-size: 100%; background-color:
#ddfade;">Similar for non-persistent messages that are not stored in your configured KahaDB
persistence adapter but get swapped to temp storage once they exceed the broker's configured
memoryUsage limit. A similar logging configuration can show details of the cleanup of temp
storage.</span> </p>
                                                    <p class="diff-block-target diff-block-context"
style="font-size: 13px"> <span class="diff-html-added" style="font-size: 100%; background-color:
#ddfade;">&nbsp;</span> </p>
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<pre style="font-size: 13px">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">log4j.appender.kahadb=org.apache.log4j.RollingFileAppender
log4j.appender.kahadb.file=${activemq.base}/data/kahadb.log
log4j.appender.kahadb.maxFileSize=1024KB
log4j.appender.kahadb.maxBackupIndex=5
log4j.appender.kahadb.append=true
log4j.appender.kahadb.layout=org.apache.log4j.PatternLayout
log4j.appender.kahadb.layout.ConversionPattern=%d [%-15.15t] %-5p %-30.30c{1} - %m%n
log4j.logger.org.apache.activemq.store.kahadb=TRACE, kahadb
log4j.logger.org.apache.activemq.store.kahadb.MessageDatabase=INFO, kahadb
&nbsp;</span>
</pre> </td>
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                                                    <p class="diff-block-target diff-block-context"
style="font-size: 13px"> <span class="diff-html-added" style="font-size: 100%; background-color:
#ddfade;">&nbsp;</span> </p>
                                                    <p class="diff-block-target diff-block-context"
style="font-size: 13px"> <span class="diff-html-added" style="font-size: 100%; background-color:
#ddfade;">Note the last line of above logging configuration disables the verbose logging
of the kahadb cleanup task. If that line gets removed, the cleanup details of both kahadb
and temp storage will be logged to the same file but you need to be careful not to mix the
logging output.</span> </p>
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