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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://wiki.asterisk.org/wiki/display/~mmichelson?src=email" style="color: #3b73af; text-decoration: none"><img id="header-avatar-image" class="image_fix" src="cid:avatar_99ed0aa29d6f204db4785296f8170422" 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> Added full_backend_cache documentation</td>
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<td id="page-title-pattern-icon-image-container-cell" style="padding: 0px; border-collapse: collapse; width: 16px; padding: 9px 8px 0px 0px; mso-text-raise: 5px; mso-line-height-rule: exactly"><a href="https://wiki.asterisk.org/wiki/display/AST/Sorcery+Caching?src=email" title="page icon" style="vertical-align: top;; color: #3b73af; text-decoration: none"><img style="vertical-align: top; display: block;" src="cid:page-icon" alt="page icon" title="page icon" height="16" width="16" border="0" /></a></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> <p class="diff-block-context" style="margin: 10px 0 0 0">First, if you are using default sorcery backends for objects (i.e. you have not altered <code style="font-family: monospace">sorcery.conf</code> at all), then caching will likely not have any positive effect on your configuration. However, if you are using the "realtime" sorcery wizard or any other that retrieves data from outside the Asterisk process, then caching could be a good fit for certain object types.</p> <p class="diff-block-target" style="margin: 10px 0 0 0"> <span class="diff-html-removed" id="removed-diff-0" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;">Caching </span><span class="diff-html-added" id="added-diff-0" style="font-size: 100%; background-color: #ddfade;">There are two overall flavors of caching. The first type is a method that caches individually retrieved objects. In other words, when an object is retrieved from the backend, that object is also placed in the cache. That object can then be retrieved individually from the cache the next time it is needed. This type of caching </span>works well for values that are</p> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0">The rest of the objects listed are most typically retrieved one-at-a-time and would be good for caching <span class="diff-html-added" id="added-diff-1" style="font-size: 100%; background-color: #ddfade;">in this manner</span>.</p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" id="added-diff-2" style="font-size: 100%; background-color: #ddfade;">The second type of caching instead pulls all objects from the database up front. These objects are all stored in memory, and since it is known that the cache has all objects, multiple objects can be retrieved from the cache at once. This means that </span><strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">any</span></strong><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> object type is a good fit for this type of caching.</span> </p> <h1 id="SorceryCaching-HowdoIenableCaching?" class="diff-block-context" style="margin: 10px 0 0 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0">How do I enable Caching?</h1> <p class="diff-block-context" style="margin: 10px 0 0 0">If you are familiar with enabling realtime for a sorcery object, then enabling caching should not seem difficult. Here is an example of what it might look like if you have configured PJSIP endpoints to use a cache:</p> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> <p class="diff-block-target" style="margin: 10px 0 0 0">This CLI command is used to mark an item in the cache as stale. If no object name is specified, then all objects in the cache are marked stale. If an object name is specified, then only the specified object is marked stale. For information on what it means for an object to be stale, see <a href="#SorceryCaching-stale" style="color: #3b73af; text-decoration: none"><span class="diff-html-changed" id="changed-diff-0" style="background-color: #d6f0ff;">here</span></a> </p> <h2 id="SorceryCaching-AMI" class="diff-block-context" style="margin: 10px 0 0 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0">AMI</h2>
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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://wiki.asterisk.org/wiki/s/en_GB/5639/a252d7f5e75d7a8bf7047b4b2c92f71a56a8f048.48/_/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">Since AMI commands are XML-documented in the source, there should be a dedicated wiki page with this information.</p> </td>
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</table> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> <p class="diff-block-target" style="margin: 10px 0 0 0">Issuing this command will cause the specified object in the specified cache to be marked as stale. For more information on what it means for an object to be stale, see <a href="#SorceryCaching-stale" style="color: #3b73af; text-decoration: none"><span class="diff-html-changed" id="changed-diff-1" style="background-color: #d6f0ff;">here</span></a>. Like all AMI commands, an optional ActionID may be specified.</p> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> <p class="diff-block-target" style="margin: 10px 0 0 0">Issuing this command will cause all objects in the specified cache to be marked as stale. For more information on what it means for an object to be stale, see <a href="#SorceryCaching-stale" style="color: #3b73af; text-decoration: none"><span class="diff-html-changed" id="changed-diff-2" style="background-color: #d6f0ff;">here</span></a>. Like all AMI commands, an optional ActionID may be specified.</p> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> <p class="diff-block-context" style="margin: 10px 0 0 0">This is just an example. It is not necessarily going to be a good fit for everyone's needs.</p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-removed" id="removed-diff-1" style="font-size: 100%; background-color: #ffe7e7; text-decoration: line-through;"> </span> </p> <h1 id="SorceryCaching-Pre-cachingallobjects" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-added" id="added-diff-3" style="font-size: 100%; background-color: #ddfade;">Pre-caching all objects</span> </h1> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">When introducing caching, we discussed a second form of caching, where all objects are pre-loaded from the realtime backend and placed in the cache. Why would this be necessary?</span> </p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Consider if you have configured AORs to be cached. At some point, Asterisk tried to retrieve AOR "alice". This AOR was found in a database, and it was added to the cache. Now, Asterisk gets told to retrieve all AORs. If Asterisk just looks in the cache, all it will get is "alice". The cache has no way of knowing whether it has all values cached or not. Thus, rather than even asking the cache, Asterisk skips straight to going to the database directly. The cache did not serve us much good there.</span> </p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">However, Asterisk can be told to pre-load all objects of a certain type and cache those. This way, the cache knows that it has all objects of a certain type. Therefore, if multiple objects need to be retrieved, Asterisk can ask the cache for those items and not have to hit the realtime backend at all. Here's an example configuration:</span> </p>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><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://wiki.asterisk.org/wiki/s/en_GB/5639/a252d7f5e75d7a8bf7047b4b2c92f71a56a8f048.48/_/images/icons/macrobrowser/dropdown/panel.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Panel</span></th>
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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"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">sorcery.conf</span></td>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><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://wiki.asterisk.org/wiki/s/en_GB/5639/a252d7f5e75d7a8bf7047b4b2c92f71a56a8f048.48/_/images/icons/macrobrowser/dropdown/noformat.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>No Format</span></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"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">[res_pjsip]
identify/cache = memory_cache,object_lifetime_stale=600,object_lifetime_maximum=1800,expire_on_reload=yes,full_backend_cache=yes
identify = realtime,ps_endpoint_id_ips</span>
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</table> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Just like with the above configuration, we have configured an object to be retrieved from realtime and cached in memory. Notice, though, that we have added </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">full_backend_cache=yes</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> to the end of the line. This is what causes Asterisk to pre-cache the objects. Normally, PJSIP "identify" objects would be a bad fit for caching since we tend to retrieve them all at once rather than one-at-a-time. By pre-caching all objects though, Asterisk can now retrieve all of them directly from the cache. Also notice that the other caching options are still relevant here. Rather than having the options apply to individual objects, they now apply to all of the retrieved objects. So if Asterisk retrieved 10 identifys during pre-cache, when the stale lifetime rolls around, all 10 will be marked stale and Asterisk will once again retrieve all of the objects from the backend.</span> </p> <h2 id="SorceryCaching-CLI.1" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">CLI</span> </h2> <h3 id="SorceryCaching-sorcerymemorycachepopulate<cachename>" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 16px; line-height: 25px; margin: 30px 0 0 0; margin-top: 10px"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">sorcery memory cache populate <cache name></span> </h3> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">This CLI command is used to manually tell Asterisk to remove all objects from the cache and repopulate that cache with all objects from the backend.</span> </p> <h2 id="SorceryCaching-AMI.1" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">AMI</span> </h2> <h3 id="SorceryCaching-SorceryMemoryCachePopulate<cachename>" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 16px; line-height: 25px; margin: 30px 0 0 0; margin-top: 10px"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">SorceryMemoryCachePopulate <cache name></span> </h3> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">This command has the following syntax:</span> </p>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><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://wiki.asterisk.org/wiki/s/en_GB/5639/a252d7f5e75d7a8bf7047b4b2c92f71a56a8f048.48/_/images/icons/macrobrowser/dropdown/noformat.png" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>No Format</span></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"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Action: SorceryMemoryCachePopulate
Cache: <cache name></span>
</pre> </td>
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</table> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Issuing this command has the same effect as the CLI "sorcery memory cache populate" command. It will invalidate all cached entries from the particular cache and then repopulate it with all objects from the backend.</span> </p> <h2 id="SorceryCaching-WhentousethisCachingmethod" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 20px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">When to use this Caching method</span> </h2> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Pre-caching the entire backend is a good idea if you find that caching individual objects is not working for you. The tradeoff is that you will use more memory this way since all objects are retrieved from the cache at once.</span> </p> </td>
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