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From "Hiram Chirino (Confluence)" <conflue...@apache.org>
Subject [CONF] Apache ActiveMQ > KahaDB
Date Fri, 21 Feb 2014 16:16:00 GMT
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                                                            <a href="    https://cwiki.apache.org/confluence/display/~chirino
" style="color:#326ca6;text-decoration:none;; color: #326ca6; text-decoration: none">Hiram
Chirino</a> edited the page:
                                                        </div> </td>
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                                                    <td valign="top" style="font-size:
13px"> <h2 id="email-title-heading" style="font-size: 16px; line-height: 20px; min-height:
20px; margin: 0; padding: 0"> <a href="https://cwiki.apache.org/confluence/display/ACTIVEMQ/KahaDB"
style="color: #326ca6; text-decoration: none"> <img class="icon" src="cid:page-icon"
alt="" style="border: 0; padding: 0 5px 0 0; text-align: left; vertical-align: middle" />
<strong style="font-size:16px;line-height:20px;vertical-align:top;">KahaDB</strong>
</a> </h2> </td>
                                                </tr>
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16px 0">
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                                                <div id="page-diffs" class="wiki-content">
                                                    <p class="diff-block-target" style="font-size:
13px">KahaDB is a file based persistence database that is local to the message broker that
is using it. It has been optimised for fast persistence and is the the default storage mechanism
from ActiveMQ 5.4 onwards. KahaDB uses less file descriptors and provides faster recovery
than its predecessor, the <a class="confluence-link unresolved" href="#" style="color:
#326ca6; text-decoration: none"><span class="diff-html-removed" id="removed-diff-0"
style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">amq
message store</span></a><span class="diff-html-added" style="font-size: 100%;
background-color: #ddfade;"> </span><a class="confluence-link unresolved" href="#"
style="color: #326ca6; text-decoration: none"><span class="diff-html-added" id="added-diff-0"
style="font-size: 100%; background-color: #ddfade;">AMQ Message Store</span></a>.</p>
                                                    <h2 id="KahaDB-Configuration" class="diff-block-context">Configuration</h2>
                                                    <p class="diff-block-context" style="font-size:
13px">You can configure ActiveMQ to use KahaDB for its persistence adapter - like below:</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%;">
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                                                            <tr>
                                                                <th class="diff-macro-title"
style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;;
font-size: 13px"><span class="icon macro-placeholder-icon" style="background-color:
;line-height: 20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB-1988229788/4109/76e0dbb30bc8580e459c201f3535d84f9283a9ac.1/_/plugins/servlet/confluence/placeholder/macro-icon?name=code"
style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</th>
                                                            </tr>
                                                        </thead>
                                                        <tbody>
                                                            <tr>
                                                                <td class="diff-macro-body"
style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px">
<pre style="font-size: 13px">

<span class="diff-html-removed" id="removed-diff-1" style="font-size: 100%; background-color:
#ffe7e7; text-decoration: line-through;"> </span>&lt;broker brokerName=&quot;broker&quot;
... &gt;
    &lt;persistenceAdapter&gt;
      &lt;kahaDB directory=&quot;activemq-data&quot; journalMaxFileLength=&quot;32mb&quot;/&gt;
    &lt;/persistenceAdapter&gt;
    ...
 &lt;/broker&gt;

</pre> </td>
                                                            </tr>
                                                        </tbody>
                                                    </table>
                                                    <p class="diff-context-placeholder"
style="font-size: 13px">...</p>
                                                    <div class="table-wrap diff-block-target">
                                                        <table class="confluenceTable"
style="border-collapse: collapse; border: 1px solid #ddd;">
                                                            <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;; font-size: 13px"> <p style="font-size:
13px">property name</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;; font-size: 13px"> <p style="font-size:
13px">default value</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;; font-size: 13px"> <p style="font-size:
13px">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;; font-size: 13px"> <p style="font-size: 13px">directory</p> </td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">activemq-data</p> </td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">the path to the directory to use
to store the message store data and log files</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;; font-size: 13px"><span class="diff-html-added" id="added-diff-1" style="font-size:
100%; background-color: #ddfade;">IndexDirectory</span></td>
                                                                    <td colspan="1" class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"><span class="diff-html-added" style="font-size: 100%; background-color:
#ddfade;">&nbsp;</span></td>
                                                                    <td colspan="1" class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px"> <span><span class="diff-html-added"
style="font-size: 100%; background-color: #ddfade;">If set, configures where the KahaDB
index files will be stored. If not set, the index files are stored in the directory specified
by the 'directory' attribute. </span></span> </p>
                                                                        <table class="diff-macro
diff-html-added" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px 1px;padding:
0 2px 2px;width: 100%;background-color: #ddfade;border-color: #93c49f;">
                                                                            <thead>
                                                                                <tr>
                                                                                    <th
class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight:
normal;padding: 5px;; font-size: 13px"><span class="diff-html-added" style="font-size:
100%; background-color: #ddfade;"><span class="icon macro-placeholder-icon" style="background-color:
;line-height: 20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB-1988229788/4109/76e0dbb30bc8580e459c201f3535d84f9283a9ac.1/_/images/icons/macrobrowser/dropdown/note.png"
style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Note</span></th>
                                                                                </tr>
                                                                            </thead>
                                                                            <tbody>
                                                                                <tr>
                                                                                    <td
class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;;
font-size: 13px"><span class="diff-html-added" style="font-size: 100%; background-color:
#ddfade;">Available as of ActiveMQ 5.10</span></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;; font-size: 13px"> <p style="font-size: 13px">indexWriteBatchSize</p>
</td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">1000</p> </td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">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;; font-size: 13px"> <p style="font-size: 13px">indexCacheSize</p> </td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">10000</p> </td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">number of index pages cached in
memory</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;; font-size: 13px"> <p style="font-size: 13px">enableIndexWriteAsync</p>
</td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">false</p> </td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">if set, will asynchronously write
indexes</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;; font-size: 13px"> <p style="font-size: 13px">journalMaxFileLength</p>
</td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">32mb</p> </td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">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;; font-size: 13px"> <p style="font-size: 13px">enableJournalDiskSyncs</p>
</td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">true</p> </td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">ensure every non transactional
journal write is followed by a disk sync (JMS durability requirement)</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;; font-size: 13px"> <p style="font-size: 13px">cleanupInterval</p> </td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">30000</p> </td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">time (ms) before checking for
a discarding/moving message data logs that are no longer used</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;; font-size: 13px"> <p style="font-size: 13px">checkpointInterval</p> </td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">5000</p> </td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">time (ms) before checkpointing
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;; font-size: 13px"> <p style="font-size: 13px">ignoreMissingJournalfiles</p>
</td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">false</p> </td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">If enabled, will ignore a missing
message log file</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;; font-size: 13px"> <p style="font-size: 13px">checkForCorruptJournalFiles</p>
</td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">false</p> </td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">If enabled, will check for corrupted
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;; font-size: 13px"> <p style="font-size: 13px">checksumJournalFiles</p>
</td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px"> <span style="text-decoration:
line-through;">false</span> true <sub>v5.9</sub> </p> </td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">create a checksum for a journal
file - to enable checking for corrupted journals</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;; font-size: 13px"> <p style="font-size: 13px">archiveDataLogs</p> </td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">false</p> </td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">If enabled, 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;; font-size: 13px"> <p style="font-size: 13px">directoryArchive</p> </td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">null</p> </td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">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;; font-size: 13px"> <p style="font-size: 13px">maxAsyncJobs</p> </td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">10000</p> </td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">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;; font-size: 13px"> <p style="font-size: 13px">concurrentStoreAndDispatchTopics</p>
</td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">false</p> </td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">enable the dispatching of Topic
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;; font-size: 13px"> <p style="font-size: 13px">concurrentStoreAndDispatchQueues</p>
</td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">true</p> </td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">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;; font-size: 13px"> <p style="font-size: 13px">archiveCorruptedIndex</p>
</td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">false</p> </td>
                                                                    <td class="confluenceTd"
style="border: 1px solid #DDD; padding: 5px 7px; min-width: 0.6em; text-align: left; vertical-align:
top;; font-size: 13px"> <p style="font-size: 13px">If enabled, corrupted indexes
found at startup will be archived (not deleted)</p> </td>
                                                                </tr>
                                                            </tbody>
                                                        </table>
                                                    </div>
                                                    <p class="diff-context-placeholder"
style="font-size: 13px">...</p>
                                                    <p class="diff-block-target diff-block-context"
style="font-size: 13px">Each instance of kahaDB can be configured independently. If no
destination is supplied to a <code style="font-size: 13px">filteredKahaDB</code>,
the implicit default value will match any destination, queue or topic. This is a handy catch
all. If no matching persistence adapter can be found, destination creation will fail with
an exception. The <code style="font-size: 13px">filteredKahaDB</code> shares its
wildcard matching rules with <a class="confluence-link unresolved" href="#" style="color:
#326ca6; text-decoration: none"><span class="diff-html-removed" id="removed-diff-2"
style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">per
destination policies</span></a><span class="diff-html-added" style="font-size:
100%; background-color: #ddfade;"> </span><a class="confluence-link unresolved"
href="#" style="color: #326ca6; text-decoration: none"><span class="diff-html-added"
id="added-diff-2" style="font-size: 100%; background-color: #ddfade;">Per Destination Policies</span></a>.</p>
                                                    <table class="diff-macro diff-block-target
diff-block-context" style="background-color: #f0f0f0;border: 1px solid #dddddd;margin: 10px
1px;padding: 0 2px 2px;width: 100%;">
                                                        <thead>
                                                            <tr>
                                                                <th class="diff-macro-title"
style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;;
font-size: 13px"><span class="icon macro-placeholder-icon" style="background-color:
;line-height: 20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB-1988229788/4109/76e0dbb30bc8580e459c201f3535d84f9283a9ac.1/_/plugins/servlet/confluence/placeholder/macro-icon?name=code"
style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</th>
                                                            </tr>
                                                        </thead>
                                                        <tbody>
                                                            <tr>
                                                                <td class="diff-macro-body"
style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px">
<pre style="font-size: 13px">
<span class="diff-html-removed" id="removed-diff-3" style="font-size: 100%; background-color:
#ffe7e7; text-decoration: line-through;">
</span>&lt;broker brokerName=&quot;broker&quot; ... &gt;
 &lt;persistenceAdapter&gt;
  &lt;mKahaDB directory=&quot;${activemq.base}/data/kahadb&quot;&gt;
    &lt;filteredPersistenceAdapters&gt;
      &lt;!-- match all queues --&gt;
      &lt;filteredKahaDB queue=&quot;&gt;&quot;&gt;
        &lt;persistenceAdapter&gt;
          &lt;kahaDB journalMaxFileLength=&quot;32mb&quot;/&gt;
        &lt;/persistenceAdapter&gt;
      &lt;/filteredKahaDB&gt;

      &lt;!-- match all destinations --&gt;
      &lt;filteredKahaDB&gt;
        &lt;persistenceAdapter&gt;
          &lt;kahaDB enableJournalDiskSyncs=&quot;false&quot;/&gt;
        &lt;/persistenceAdapter&gt;
      &lt;/filteredKahaDB&gt;
    &lt;/filteredPersistenceAdapters&gt;
  &lt;/mKahaDB&gt;
 &lt;/persistenceAdapter&gt;
...
&lt;/broker&gt;
</pre> </td>
                                                            </tr>
                                                        </tbody>
                                                    </table>
                                                    <p class="diff-context-placeholder"
style="font-size: 13px">...</p>
                                                    <p class="diff-block-context" style="font-size:
13px">When the <code style="font-size: 13px">perDestination</code> boolean
attribute is set to true on the catch all (no explicit destination set), <code style="font-size:
13px">filteredKahaDB</code>. Each matching destination will get its own <code
style="font-size: 13px">kahaDB</code> instance.</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%;">
                                                        <thead>
                                                            <tr>
                                                                <th class="diff-macro-title"
style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;;
font-size: 13px"><span class="icon macro-placeholder-icon" style="background-color:
;line-height: 20px;"><img src="https://cwiki.apache.org/confluence/s/en_GB-1988229788/4109/76e0dbb30bc8580e459c201f3535d84f9283a9ac.1/_/plugins/servlet/confluence/placeholder/macro-icon?name=code"
style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</th>
                                                            </tr>
                                                        </thead>
                                                        <tbody>
                                                            <tr>
                                                                <td class="diff-macro-body"
style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; font-size: 13px">
<pre style="font-size: 13px">
<span class="diff-html-removed" id="removed-diff-4" style="font-size: 100%; background-color:
#ffe7e7; text-decoration: line-through;">
</span>&lt;broker brokerName=&quot;broker&quot; ... &gt;
 &lt;persistenceAdapter&gt;
  &lt;mKahaDB directory=&quot;${activemq.base}/data/kahadb&quot;&gt;
    &lt;filteredPersistenceAdapters&gt;
      &lt;!-- kahaDB per destinations --&gt;
      &lt;filteredKahaDB perDestination=&quot;true&quot; &gt;
        &lt;persistenceAdapter&gt;
          &lt;kahaDB journalMaxFileLength=&quot;32mb&quot; /&gt;
        &lt;/persistenceAdapter&gt;
      &lt;/filteredKahaDB&gt;
    &lt;/filteredPersistenceAdapters&gt;
  &lt;/mKahaDB&gt;
 &lt;/persistenceAdapter&gt;
...
&lt;/broker&gt;
</pre> </td>
                                                            </tr>
                                                        </tbody>
                                                    </table>
                                                </div>
                                            </div>
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