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From "Paul Gale (Confluence)" <conflue...@apache.org>
Subject [CONF] Apache ActiveMQ > Pluggable storage lockers
Date Mon, 27 Jan 2014 18:09:00 GMT
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                                                            <a href="    https://cwiki.apache.org/confluence/display/~paulgale
" style="color:#326ca6;text-decoration:none;; color: #326ca6; text-decoration: none">Paul
Gale</a> edited the page:
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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/Pluggable+storage+lockers"
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;">Pluggable storage
lockers</strong> </a> </h2> </td>
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<b>Comment:</b> Typo. </p>
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                                                    <p class="diff-context-placeholder"
style="font-size: 13px">...</p>
                                                    <p class="diff-block-target" style="font-size:
13px">The Lease Database Locker solves <span class="diff-html-added" id="added-diff-0"
style="font-size: 100%; background-color: #ddfade;">the </span>master/slave problem
of the default Database Locker. The master broker acquires a lock that's only valid for a
short period. To retain the lock the master broker must periodically extend the lock's lease.
The slave broker also checks periodically to see if the lease has expired. The lease can survive
a db replica failover. You can configure it like this:</p>
                                                    <p class="diff-context-placeholder"
style="font-size: 13px">...</p>
                                                    <p class="diff-block-target" style="font-size:
13px">The lease based lock is acquired by blocking at startup. It is then retained for
a period whose duration (in ms) is given by the <code style="font-size: 13px">lockKeepAlivePeriod</code>
attribute. To retain the lock the master broker <span class="diff-html-removed" id="removed-diff-0"
style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">continually
</span><span class="diff-html-added" id="added-diff-1" style="font-size: 100%; background-color:
#ddfade;">periodically </span>extends its lease by <code style="font-size: 13px">lockAcquireSleepInterval</code>
milliseconds each time. In theory, therefore, the master broker is always (<code style="font-size:
13px">lockAcquireSleepInterval</code>&nbsp;<code style="font-size: 13px">-</code>
<code style="font-size: 13px">lockKeepAlivePeriod</code>) ahead of the slave broker
w.r.t the lease. It is imperative that <code style="font-size: 13px">lockAcquireSleepInterval
&gt; lockKeepAlivePeriod</code>, to ensure the lease is always current. As of ActiveMQ
5.9.0 a warning message is logged if this condition is not met.</p>
                                                    <p class="diff-context-placeholder"
style="font-size: 13px">...</p>
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