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From "Paul Gale (Confluence)" <conflue...@apache.org>
Subject [CONF] Apache ActiveMQ > KahaDB
Date Fri, 09 Dec 2016 22:22:43 GMT
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<td id="header-avatar-image-container" valign="top" style="padding: 0px; border-collapse: collapse; vertical-align: top; width: 32px; padding-right: 9px"><a href="https://cwiki.apache.org/confluence/display/~paulgale?src=mail&amp;src.mail.timestamp=1481322163444&amp;src.mail.notification=com.atlassian.confluence.plugins.confluence-content-notifications-plugin%3Apage-edited-notification&amp;src.mail.recipient=8aa980874e36a1eb014e36a2a6263ca9" style="color: #3b73af; text-decoration: none"><img id="header-avatar-image" class="image_fix" src="cid:avatar_55f1f821eca17742a7f7bb51a11fe95e" height="32" width="32" border="0" style="border-radius: 3px; vertical-align: top"></a></td>
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<td class="notification-comment-pattern-container mobile-resize-text" style="padding: 0px; border-collapse: collapse; padding: 0px"><strong>Change comment:</strong> Font formatting</td> 
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<table class="content-excerpt-pattern" cellspacing="0" cellpadding="0" border="0" width="100%" style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333; font-family: Arial, sans-serif; font-size: 14px; line-height: 20px; mso-line-height-rule: 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> 
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<table style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333"> 
<tbody> 
<tr> 
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">language</td> 
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">xml</td> 
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0"> &lt;broker brokerName="broker"&gt;
    &lt;persistenceAdapter&gt;
      &lt;kahaDB directory="activemq-data" journalMaxFileLength="32mb"/&gt;
    &lt;/persistenceAdapter&gt;
 &lt;/broker&gt;
</pre> </td> 
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</tbody> 
</table> <h3 id="KahaDB-KahaDBProperties" class="diff-block-context" style="margin: 10px 0 0 0; font-size: 16px; line-height: 25px; margin: 30px 0 0 0">KahaDB Properties</h3> 
<div class="table-wrap diff-block-target diff-block-context" style="margin: 10px 0 0 0; overflow-x: auto"> 
<table class="confluenceTable" style="border-collapse: collapse; border: 1px solid #ddd;; border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333; border-collapse: collapse; margin: 10px 0 0 0; overflow-x: auto; margin-top: 0"> 
<tbody> 
<tr> 
<th class="confluenceTh" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;background-color: #F0F0F0; font-weight: bold;; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left; background-color: #f0f0f0; font-weight: bold"> <p style="margin: 10px 0 0 0; margin-top: 0; background-color: #f0f0f0; font-weight: bold"> <span class="diff-html-removed" id="removed-diff-0" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">property name</span><span class="diff-html-added" id="added-diff-0" style="font-size: 100%; background-color: #ddfade;">Property</span> </p> </th> 
<th class="confluenceTh" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;background-color: #F0F0F0; font-weight: bold;; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left; background-color: #f0f0f0; font-weight: bold"> <p style="margin: 10px 0 0 0; margin-top: 0; background-color: #f0f0f0; font-weight: bold"> <span class="diff-html-removed" id="removed-diff-1" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">default value</span><span class="diff-html-added" id="added-diff-1" style="font-size: 100%; background-color: #ddfade;">Default</span> </p> </th> 
<th class="confluenceTh" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;background-color: #F0F0F0; font-weight: bold;; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left; background-color: #f0f0f0; font-weight: bold"> <p style="margin: 10px 0 0 0; margin-top: 0; background-color: #f0f0f0; font-weight: bold">Comments</p> </th> 
</tr> 
<tr> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">archiveCorruptedIndex</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">false</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0">If <strong><code style="font-family: monospace">true</code></strong>, corrupted indexes found at startup will be archived (not deleted).</p> </td> 
</tr> 
<tr> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">archiveDataLogs</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">false</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0">If <strong><code style="font-family: monospace">true</code></strong>, will move a message data log to the archive directory instead of deleting it.</p> </td> 
</tr> 
<tr> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">checkForCorruptJournalFiles</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">false</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0">If <strong><code style="font-family: monospace">true</code></strong>, will check for corrupt journal files on startup and try and recover them.</p> </td> 
</tr> 
<tr> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">checkpointInterval</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">5000</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0">Time (ms) before check-pointing the journal.</p> </td> 
</tr> 
<tr> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">checksumJournalFiles</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">true</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0">Create a checksum for a journal file. The presence of a checksum is required in order for the persistence adapter to be able to detect corrupt journal files.</p> <p style="margin: 10px 0 0 0">Before <strong>ActiveMQ 5.9.0</strong>: the default is <strong><code style="font-family: monospace">false</code></strong>.</p> </td> 
</tr> 
<tr> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">cleanupInterval</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">30000</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0">The interval (in ms) between consecutive checks that determine which journal files, if any, are eligible for removal from the message store. An eligible journal file is one that has no outstanding references.</p> </td> 
</tr> 
<tr> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">compactAcksAfterNoGC</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">10</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0">From <strong>ActiveMQ 5.14.0</strong>: when the acknowledgement compaction feature is enabled this value controls how many store GC cycles must be completed with no other files being cleaned up before the compaction logic is triggered to possibly compact older acknowledgements spread across journal files into a new log file.&nbsp; The lower the value set the faster the compaction may occur which can impact performance if it runs to often.</p> </td> 
</tr> 
<tr> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">compactAcksIgnoresStoreGrowth</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">false</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0">From <strong>ActiveMQ 5.14.0</strong>:&nbsp;when the acknowledgement compaction feature is enabled this value controls whether compaction is run when the store is still growing or if it should only occur when the store has stopped growing (either due to idle or store limits reached).&nbsp; If enabled the compaction runs regardless of the store still having room or being active which can decrease overall performance but reclaim space faster.&nbsp;</p> </td> 
</tr> 
<tr> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">concurrentStoreAndDispatchQueues</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">true</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0">Enable the dispatching of Queue messages to interested clients to happen concurrently with message storage.</p> </td> 
</tr> 
<tr> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">concurrentStoreAndDispatchTopics</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">false</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0">Enable the dispatching of Topic messages to interested clients to happen concurrently with message storage</p> 
<table class="diff-macro" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;; border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333"> 
<thead> 
<tr> 
<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB/5982/f2b47fb3d636c8bc9fd0b11c0ec6d0ae18646be7.1/_/images/icons/macrobrowser/dropdown/warning.png" style="padding-right: 5px; vertical-align: text-bottom;; max-width: none"> </span>Warning</th> 
</tr> 
</thead> 
<tbody> 
<tr> 
<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <p style="margin: 10px 0 0 0; margin-top: 0"> <span class="diff-html-changed" id="changed-diff-0" style="background-color: #d6f0ff;">Enabling this property is not recommended.</span> </p> </td> 
</tr> 
</tbody> 
</table> </td> 
</tr> 
<tr> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">directory</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">activemq-data</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0">The path to the directory to use to store the message store data and log files.</p> </td> 
</tr> 
<tr> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">directoryArchive</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">null</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0">Define the directory to move data logs to when they all the messages they contain have been consumed.</p> </td> 
</tr> 
<tr> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">enableAckCompaction</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">true</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0">From <strong>ActiveMQ 5.14.0</strong>: this setting controls whether the store will perform periodic compaction of older journal log files that contain only Message acknowledgements. By compacting these older acknowledgements into new journal log files the older files can be removed freeing space and allowing the message store to continue to operate without hitting store size limits.</p> </td> 
</tr> 
<tr> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">enableIndexWriteAsync</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">false</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0">If <strong><code style="font-family: monospace">true</code></strong>, the index is updated asynchronously.</p> </td> 
</tr> 
<tr> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">enableJournalDiskSyncs</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">true</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <span>Ensure every journal write is followed by a disk sync (JMS durability requirement).</span> </p> 
<table class="diff-macro" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;; border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333"> 
<thead> 
<tr> 
<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB/5982/f2b47fb3d636c8bc9fd0b11c0ec6d0ae18646be7.1/_/images/icons/macrobrowser/dropdown/warning.png" style="padding-right: 5px; vertical-align: text-bottom;; max-width: none"> </span>Warning</th> 
</tr> 
</thead> 
<tbody> 
<tr> 
<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <p style="margin: 10px 0 0 0; margin-top: 0">This property is deprecated as of <strong>ActiveMQ</strong> <strong>5.14.0</strong>.</p> <p style="margin: 10px 0 0 0">From <strong>ActiveMQ</strong> <strong>5.14.0</strong>: see <span style="color: rgb(34,34,34);"><strong><code style="font-family: monospace">journalDiskSyncStrategy</code></strong>.</span> </p> </td> 
</tr> 
</tbody> 
</table> </td> 
</tr> 
<tr> 
<td colspan="1" class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace"><span><span class="diff-html-changed" id="changed-diff-1" style="background-color: #d6f0ff;">journalDiskSyncStrategy</span></span></code> </p> </td> 
<td colspan="1" class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;">always</span></code> </p> </td> 
<td colspan="1" class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0">From <strong>ActiveMQ 5.14.0</strong>: this setting configures the disk sync policy. The list of available sync strategies are (in order of decreasing safety, and increasing performance):</p> 
<ul style="margin: 10px 0 0 0; margin-left: 0; padding-left: 22px"> 
<li> <p style="margin: 10px 0 0 0; margin-top: 0"> <strong><code style="font-family: monospace"><span class="diff-html-changed" id="changed-diff-2" style="background-color: #d6f0ff;">always</span></code></strong><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span><span><span class="diff-html-changed" style="background-color: #d6f0ff;">Ensure every journal write is followed by a disk sync (JMS durability requirement). This is the safest option but is also the slowest because it requires a sync after every message write. This is equivalent to the deprecated property&nbsp;</span><strong><code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;">enableJournalDiskSyncs=true</span></code></strong><span class="diff-html-changed" style="background-color: #d6f0ff;">.</span></span> </p> </li> 
<li> <p style="margin: 10px 0 0 0; margin-top: 0"> <strong><code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;">periodic</span></code></strong><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span><span style="color: rgb(34,34,34);"><span class="diff-html-changed" style="background-color: #d6f0ff;">The disk will be synced at set intervals (if a write has occurred) instead of after every journal write which will reduce the load on the disk and should improve throughput</span></span><span class="diff-html-changed" style="background-color: #d6f0ff;">. The disk will also be synced when rolling over to a new journal file. The default interval is 1 second. The default interval offers very good performance, whilst being safer than&nbsp;</span><strong><code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;">never</span></code></strong><span class="diff-html-changed" style="background-color: #d6f0ff;"> disk syncing, as data loss is limited to a maximum of 1 second's worth. See </span><strong><code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;">journalDiskSyncInterval</span></code></strong><span class="diff-html-changed" style="background-color: #d6f0ff;"> to change the frequency of disk syncs.</span> </p> </li> 
<li> <p style="margin: 10px 0 0 0; margin-top: 0"> <strong><code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;">never</span></code></strong><span class="diff-html-changed" style="background-color: #d6f0ff;"> A sync will never be explicitly called and it will be up to the operating system to flush to disk. This is equivalent to setting the deprecated property </span><strong><code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;">enableJournalDiskSyncs=false</span></code></strong><span class="diff-html-changed" style="background-color: #d6f0ff;">. This is the fastest option but is the least safe as there's no guarantee as to when data is flushed to disk. Consequently message loss </span><em><span class="diff-html-changed" style="background-color: #d6f0ff;">can</span></em><span class="diff-html-changed" style="background-color: #d6f0ff;"> occur on broker failure.</span> </p> </li> 
</ul> </td> 
</tr> 
<tr> 
<td colspan="1" class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace"><span><span class="diff-html-changed" style="background-color: #d6f0ff;">journalDiskSyncInterval</span></span></code> </p> </td> 
<td colspan="1" class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;">1000</span></code> </p> </td> 
<td colspan="1" class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <span class="diff-html-changed" style="background-color: #d6f0ff;">Interval (ms) for when to perform a disk sync when&nbsp;</span><strong><code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;">journalDiskSyncStrategy=periodic</span></code></strong><span class="diff-html-changed" style="background-color: #d6f0ff;">. A sync will only be performed if a write has occurred to the journal since the last disk sync or when the journal rolls over to a new journal file.</span> </p> </td> 
</tr> 
<tr> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">ignoreMissingJournalfiles</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">false</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0">If <strong><code style="font-family: monospace">true</code></strong>, reports of missing journal files are ignored.</p> </td> 
</tr> 
<tr> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">indexCacheSize</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">10000</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0">Number of index pages cached in memory.</p> </td> 
</tr> 
<tr> 
<td colspan="1" class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">indexDirectory</code> </p> </td> 
<td colspan="1" class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left">&nbsp;</td> 
<td colspan="1" class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <span>From <strong>ActiveMQ 5.10.0</strong>: If set, configures where the KahaDB index files (<strong><code style="font-family: monospace">db.data</code></strong> and&nbsp;<strong><code style="font-family: monospace">db.redo</code></strong>) will be stored. If not set, the index files are stored in the directory specified by the&nbsp;<strong><code style="font-family: monospace">directory</code></strong> attribute.</span> </p> </td> 
</tr> 
<tr> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">indexWriteBatchSize</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">1000</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0">Number of indexes written in a batch.</p> </td> 
</tr> 
<tr> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">journalMaxFileLength</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">32mb</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0">A hint to set the maximum size of the message data logs.</p> </td> 
</tr> 
<tr> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">maxAsyncJobs</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">10000</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0">The maximum number of asynchronous messages that will be queued awaiting storage (should be the same as the number of concurrent MessageProducers).</p> </td> 
</tr> 
<tr> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">preallocationScope</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace"><span class="diff-html-changed" id="changed-diff-3" style="background-color: #d6f0ff;">entire_journal</span></code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0">From <strong>ActiveMQ 5.14.0</strong>: this setting configures how journal data files are preallocated. The default strategy preallocates the journal file on first use using the appender thread.&nbsp;</p> 
<ul style="margin: 10px 0 0 0; margin-left: 0; padding-left: 22px"> 
<li> <p style="margin: 10px 0 0 0; margin-top: 0"> <strong><code style="font-family: monospace"><span class="diff-html-changed" id="changed-diff-4" style="background-color: #d6f0ff;">entire_journal_async</span></code></strong><span class="diff-html-changed" style="background-color: #d6f0ff;"> will use preallocate ahead of time in a separate thread.</span> </p> </li> 
<li> <p style="margin: 10px 0 0 0; margin-top: 0"> <strong><code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;">none</span></code></strong><span class="diff-html-changed" style="background-color: #d6f0ff;"> disables preallocation.</span> </p> </li> 
</ul> <p style="margin: 10px 0 0 0">On SSD, using&nbsp;<strong><code style="font-family: monospace">entire_journal_async</code></strong> avoids delaying writes pending preallocation on first use.<strong>Note</strong>: on HDD the additional thread contention for disk has a negative impact. Therefore use the default.</p> </td> 
</tr> 
<tr> 
<td colspan="1" class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">preallocationStrategy</code> </p> </td> 
<td colspan="1" class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">sparse_file</code> </p> </td> 
<td colspan="1" class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0">From <strong>ActiveMQ 5.12.0</strong>:&nbsp;This setting configures how the broker will try to preallocate the journal files when a new journal file is needed.</p> 
<ul style="margin: 10px 0 0 0; margin-left: 0; padding-left: 22px"> 
<li> <p style="margin: 10px 0 0 0; margin-top: 0"> <strong><code style="font-family: monospace"><span class="diff-html-changed" id="changed-diff-5" style="background-color: #d6f0ff;">sparse_file</span></code></strong><span class="diff-html-changed" style="background-color: #d6f0ff;"> - sets the file length, but does not populate it with any data.</span> </p> </li> 
<li> <p style="margin: 10px 0 0 0; margin-top: 0"> <strong><code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;">os_kernel_copy</span></code></strong><span class="diff-html-changed" style="background-color: #d6f0ff;"> - delegates the preallocation to the Operating System.</span> </p> </li> 
<li> <p style="margin: 10px 0 0 0; margin-top: 0"> <strong><code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;">zeros</span></code></strong><span class="diff-html-changed" style="background-color: #d6f0ff;">&nbsp; - each preallocated journal file contains nothing but </span><strong><code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;">0x00</span></code></strong><span class="diff-html-changed" style="background-color: #d6f0ff;"> throughout.</span> </p> </li> 
</ul> </td> 
</tr> 
<tr> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">storeOpenWireVersion</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0"> <code style="font-family: monospace">11</code> </p> </td> 
<td class="confluenceTd" style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align: top;; padding: 0px; border-collapse: collapse; border: 1px solid #ddd; padding: 7px 10px; vertical-align: top; text-align: left"> <p style="margin: 10px 0 0 0; margin-top: 0">Determines the version of OpenWire commands that are marshaled to the KahaDB journal.&nbsp;</p> <p style="margin: 10px 0 0 0">Before <strong>ActiveMQ 5.12.0</strong>: the default value is <strong><code style="font-family: monospace">6</code></strong>.</p> <p style="margin: 10px 0 0 0">Some features of the broker depend on information stored in the OpenWire commands from newer protocol revisions and these may not work correctly if the store version is set to a lower value.&nbsp; KahaDB stores from broker versions greater than 5.9.0 will in many cases still be readable by the broker but will cause the broker to continue using the older store version meaning newer features may not work as intended.&nbsp;</p> <p style="margin: 10px 0 0 0">For KahaDB stores that were created in versions prior to <strong>ActiveMQ 5.9.0</strong> it will be necessary to manually set <strong><code style="font-family: monospace">storeOpenWireVersion="6"</code></strong> in order to start a broker without error.</p> </td> 
</tr> 
</tbody> 
</table> 
</div> 
<table class="diff-macro diff-block-target" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;; border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333"> 
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB/5982/f2b47fb3d636c8bc9fd0b11c0ec6d0ae18646be7.1/_/images/icons/macrobrowser/dropdown/info.png" style="padding-right: 5px; vertical-align: text-bottom;"> </span>Info</th> 
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <p style="margin: 10px 0 0 0; margin-top: 0"> <span class="diff-html-changed" id="changed-diff-6" style="background-color: #d6f0ff;">For tuning locking properties see the options listed at </span><a href="/confluence/pages/viewpage.action?pageId=30150882" style="color: #3b73af; text-decoration: none"><span class="diff-html-changed" style="background-color: #d6f0ff;">Pluggable storage lockers.</span></a> </p> </td> 
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</tbody> 
</table> <p class="diff-block-context" style="margin: 10px 0 0 0">&nbsp;</p> <h3 id="KahaDB-SlowFileSystemAccessDiagnosticLogging" class="diff-block-context" style="margin: 10px 0 0 0; font-size: 16px; line-height: 25px; margin: 30px 0 0 0">Slow File System Access Diagnostic Logging</h3> <p class="diff-context-placeholder" style="margin: 10px 0 0 0; margin-top: 0">...</p> 
<table class="diff-macro diff-block-target" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding: 0 2px 2px;width: 100%;; border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333"> 
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB/5982/f2b47fb3d636c8bc9fd0b11c0ec6d0ae18646be7.1/_/images/icons/macrobrowser/dropdown/info.png" style="padding-right: 5px; vertical-align: text-bottom;"> </span>Info</th> 
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</thead> 
<tbody> 
<tr> 
<td class="diff-macro-properties" style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;padding: 0; border: 1px solid #dddddd;; padding: 0px; border-collapse: collapse"> 
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<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">title</td> 
<td style="background-color: #fafafa; padding: 0 0 0 5px; font-size: 12px; text-align: left;; padding: 0px; border-collapse: collapse">Note:</td> 
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <p style="margin: 10px 0 0 0; margin-top: 0">Specifying both <strong><code style="font-family: monospace">perDestination="true"</code></strong> <em>and</em>&nbsp;<strong><code style="font-family: monospace">queue="&gt;"</code></strong> on the same&nbsp;<strong><code style="font-family: monospace">filteredKahaDB</code></strong> entry has not been tested. It <em> may</em> result in <span class="diff-html-added" id="added-diff-2" style="font-size: 100%; background-color: #ddfade;">the following exception being raised</span>:</p> <p style="margin: 10px 0 0 0"> <span class="diff-html-removed" id="removed-diff-3" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">&nbsp;</span> </p> <p style="margin: 10px 0 0 0"> <code style="font-family: monospace"><span class="diff-html-changed" id="changed-diff-7" style="background-color: #d6f0ff;">Reason: </span></code> </p> <span class="diff-html-removed" id="removed-diff-4" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span> <p style="margin: 10px 0 0 0"> <code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span><span class="diff-html-changed" id="changed-diff-8" style="background-color: #d6f0ff;">java.io.IOException: </span></code> </p> <span class="diff-html-removed" id="removed-diff-5" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span> <p style="margin: 10px 0 0 0"> <code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span><span class="diff-html-changed" id="changed-diff-9" style="background-color: #d6f0ff;">File </span></code> </p> <span class="diff-html-removed" id="removed-diff-6" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span> <p style="margin: 10px 0 0 0"> <code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span><span class="diff-html-changed" id="changed-diff-10" style="background-color: #d6f0ff;">'/opt/java/apache-activemq-5.9.0/data/mKahaDB/lock' </span></code> </p> <span class="diff-html-removed" id="removed-diff-7" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span> <p style="margin: 10px 0 0 0"> <code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span><span class="diff-html-changed" id="changed-diff-11" style="background-color: #d6f0ff;">could </span></code> </p> <span class="diff-html-removed" id="removed-diff-8" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span> <p style="margin: 10px 0 0 0"> <code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span><span class="diff-html-changed" id="changed-diff-12" style="background-color: #d6f0ff;">not </span></code> </p> <span class="diff-html-removed" id="removed-diff-9" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span> <p style="margin: 10px 0 0 0"> <code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span><span class="diff-html-changed" id="changed-diff-13" style="background-color: #d6f0ff;">be </span></code> </p> <span class="diff-html-removed" id="removed-diff-10" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span> <p style="margin: 10px 0 0 0"> <code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span><span class="diff-html-changed" id="changed-diff-14" style="background-color: #d6f0ff;">locked </span></code> </p> <span class="diff-html-removed" id="removed-diff-11" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span> <p style="margin: 10px 0 0 0"> <code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span><span class="diff-html-changed" id="changed-diff-15" style="background-color: #d6f0ff;">as </span></code> </p> <span class="diff-html-removed" id="removed-diff-12" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span> <p style="margin: 10px 0 0 0"> <code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span><span class="diff-html-changed" id="changed-diff-16" style="background-color: #d6f0ff;">lock </span></code> </p> <span class="diff-html-removed" id="removed-diff-13" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span> <p style="margin: 10px 0 0 0"> <code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span><span class="diff-html-changed" id="changed-diff-17" style="background-color: #d6f0ff;">is </span></code> </p> <span class="diff-html-removed" id="removed-diff-14" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span> <p style="margin: 10px 0 0 0"> <code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span><span class="diff-html-changed" id="changed-diff-18" style="background-color: #d6f0ff;">already </span></code> </p> <span class="diff-html-removed" id="removed-diff-15" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span> <p style="margin: 10px 0 0 0"> <code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span><span class="diff-html-changed" id="changed-diff-19" style="background-color: #d6f0ff;">held </span></code> </p> <span class="diff-html-removed" id="removed-diff-16" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span> <p style="margin: 10px 0 0 0"> <code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span><span class="diff-html-changed" id="changed-diff-20" style="background-color: #d6f0ff;">for </span></code> </p> <span class="diff-html-removed" id="removed-diff-17" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span> <p style="margin: 10px 0 0 0"> <code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span><span class="diff-html-changed" id="changed-diff-21" style="background-color: #d6f0ff;">this </span></code> </p> <span class="diff-html-removed" id="removed-diff-18" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span> <p style="margin: 10px 0 0 0"> <code style="font-family: monospace"><span class="diff-html-changed" style="background-color: #d6f0ff;"> </span><span class="diff-html-changed" id="changed-diff-22" style="background-color: #d6f0ff;">jvm</span></code> </p> <span class="diff-html-removed" id="removed-diff-19" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">. </span> <p style="margin: 10px 0 0 0"></p> </td> 
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</tbody> 
</table> </td> 
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</table> </td> 
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<table id="actions-pattern" cellspacing="0" cellpadding="0" border="0" width="100%" style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333; font-family: Arial, sans-serif; font-size: 14px; line-height: 20px; mso-line-height-rule: exactly; mso-text-raise: 1px"> 
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<td id="actions-pattern-container" valign="middle" style="padding: 0px; border-collapse: collapse; padding: 15px 0 0 24px; vertical-align: middle"> 
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