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From "Charles Gould (Confluence)" <conflue...@apache.org>
Subject [CONF] Apache ActiveMQ > Why do KahaDB log files remain after cleanup
Date Tue, 05 Apr 2016 02:28:46 GMT
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title="Why do KahaDB log files remain after cleanup" style="color: #3b73af; text-decoration:
none">Why do KahaDB log files remain after cleanup</a></span></td> 
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exactly; mso-text-raise: 1px"> 
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<td class="content-excerpt-pattern-container mobile-resize-text " style="padding: 0px;
border-collapse: collapse; padding: 0 0 0 24px"> <p class="diff-context-placeholder"
style="margin: 10px 0 0 0; margin-top: 0">...</p> <p class="diff-block-context"
style="margin: 10px 0 0 0">We get one candidate, data-87.log from the existing set of journal
data files <code style="font-family: monospace">[86, 87, 163, 164]</code>. There
is a current transaction using 164, destination (Queue named E) <code style="font-family:
monospace">'0\:E'</code> has some messages in 163, destination <code style="font-family:
monospace">'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-family: monospace">'0:I'</code>.<br> The <code style="font-family:
monospace">'0:'</code> prefix is shorthand for a queue, <code style="font-family:
monospace">'1:'</code> for a topic, i.e: <code style="font-family: monospace">dest:1:B</code>
is a topic named B.</p> <p class="diff-block-context" style="margin: 10px 0 0 0">&nbsp;</p>
<p class="diff-block-context" style="margin: 10px 0 0 0">&nbsp;</p> <p
class="diff-context-placeholder" style="margin: 10px 0 0 0; margin-top: 0">...</p>
<h3 id="WhydoKahaDBlogfilesremainaftercleanup-Non-persistentmessages" class="diff-block-target"
style="margin: 10px 0 0 0; font-size: 16px; line-height: 25px; margin: 30px 0 0 0"> <span
class="diff-html-changed" id="changed-diff-0" style="background-color: #d6f0ff;">Non-persistent
messages</span> </h3> <p class="diff-block-context" style="margin: 10px 0 0
0">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.</p>
<p class="diff-context-placeholder" style="margin: 10px 0 0 0; margin-top: 0">...</p>
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