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| <div class="innerhero__pre pb-3">Apache Ignite</div> |
| <h1 class="h1 innerhero__h1">Native Persistence</h1> |
| <div class="innerhero__descr pt-2 h5"> |
| Scale beyond available memory capacity <br /> |
| and skip memory warm-ups on restarts |
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| <div class="innerhero__action"><a class="button innerhero__button" href="https://ignite.apache.org/docs/latest/index">Start Coding</a></div> |
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| <img class="innerhero__pic innerhero__pic--native" src="/img/features/native-header.svg" alt="Native Persistence" /> |
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| <div class="native1__title fz20 pt-1x">Usually, in-memory caches and databases provide limited persistence capabilities.</div> |
| <p class="pt-2">For instance, some solutions just do a backup copy of <br />the in-memory data purely for restart purposes.</p> |
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| Ignite persistence doesn’t have any limitations. <br /> |
| Our native persistence behaves like a classic <br />disk-based database. |
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| <article class="native2item"> |
| <h3 class="fz20 native2item__title">Scale beyond memory <br />capacity</h3> |
| <p class="pt-1x">100% of data is always stored on disk. You decide how much memory allocate to your data.</p> |
| </article> |
| <article class="native2item"> |
| <h3 class="fz20 native2item__title">Seconds needed <br />for recovery</h3> |
| <p class="pt-1x">Ignite becomes operational from disk instantaneously. There is no need to wait for the data to get preloaded on restarts.</p> |
| </article> |
| <article class="native2item"> |
| <h3 class="fz20 native2item__title">Query in-memory <br />and on-disk data</h3> |
| <p class="pt-1x">If any record is missing in memory, then Ignite reads it from disk. This is supported for all the APIs including SQL.</p> |
| </article> |
| </div> |
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| <h3 class="h5">How it works?</h3> |
| <div class="native-howwork__text pt-1"> |
| <p> |
| The native persistence functions as a distributed, ACID, and SQL-compliant disk-based store. It integrates into the Ignite <a href="/features/multi-tier-storage.html">multi-tier storage</a> as a disk |
| tier. |
| </p> |
| <p class="pt-1">When the native persistence enabled, Ignite stores a superset of data on disk and caches as much as it can in memory.</p> |
| </div> |
| </div> |
| <div class="native-howwork__right"> |
| <p>For example</p> |
| <p class="pt-1x"> |
| If your application needs to store 200 records in an Ignite cluster and the memory capacity allows caching only 150 records, then all 200 will be stored on disk, out of which 150 will |
| be served from memory while the rest 50 from disk whenever the application requests them. |
| </p> |
| </div> |
| </div> |
| </section> |
| <section class="native-points container"> |
| <h2 class="h4">Checkpointing And Write-Ahead Logging <br />Ensure Durability And Consistency Of Data</h2> |
| <div class="native-points__grid pt-5"> |
| <div class="native-points__item fz20"><p>Committed transactions always survive failures</p></div> |
| <div class="native-points__item fz20"><p>The cluster can always be recovered to the latest successfully committed transaction</p></div> |
| </div> |
| </section> |
| <section class="native-steps"> |
| <div class="container"> |
| <h2 class="h4">Three-Step Process To Update Your Data <br />At In-Memory Speed But Not Losing A Bit</h2> |
| <img class="native-steps__pic" src="/img/features/native-stepspic.svg" alt="" /> |
| <div class="native-steps__grid"> |
| <article class="nativestepitem"> |
| <i class="fz20 pb-1x">01</i> |
| <div class="nativestepitem__text"> |
| <p> |
| As soon as the update comes from the application side, a record is updated in memory. Then, the change is added |
| <a href="https://ignite.apache.org/docs/latest/persistence/native-persistence.html#write-ahead-log">to the write-ahead log (WAL).</a> |
| </p> |
| <p>The purpose is to propagate updates to disk in the fastest way possible and provide a consistent recovery mechanism that remediates full cluster failures.</p> |
| </div> |
| </article> |
| <article class="nativestepitem"> |
| <i class="fz20 pb-1x">02</i> |
| <div class="nativestepitem__text"> |
| <p>As the WAL grows, it periodically gets checkpointed to the main storage.</p> |
| <p> |
| <a href="https://ignite.apache.org/docs/latest/persistence/native-persistence.html#checkpointing">Checkpointing</a> is the process of copying dirty pages from the memory tier to the partition files |
| on disk. |
| </p> |
| <p class="nativestepitem__small">A dirty page is a page that was updated in memory, was appended to the WAL, but was not written to the respective partition file on disk yet.</p> |
| </div> |
| </article> |
| <article class="nativestepitem"> |
| <i class="fz20 pb-1x">03</i> |
| <div class="nativestepitem__text"> |
| <p>After a while, the information about updates in WAL can be removed, compressed or moved to archive.</p> |
| <p>So you can reuse your disk space.</p> |
| </div> |
| </article> |
| </div> |
| </div> |
| </section> |
| <section class="nativecode container jsTabWrap"> |
| <header class="blockheader blockheader--spl flexi"> |
| <h2 class="h4 blockheader__left">You Decide Which Data To Persist</h2> |
| <div class="blockheader__right fz20"> |
| <p>Toggle a single configuration setting to turn a cluster into a database <br />that scales across memory and disk</p> |
| </div> |
| </header> |
| <div class="nativecode__tabctrls flexi"> |
| <a class="nativecode__link active" href="#" data-tablink="nativeTabXML">XML</a><a class="nativecode__link" href="#" data-tablink="nativeTabJava">Java</a><a class="nativecode__link" href="#" data-tablink="nativeTabNET">C#/.NET</a> |
| </div> |
| <div class="nativecode__tabs"> |
| <div class="nativecode__tab active" data-tab="nativeTabXML"> |
| <pre class="nativecode__codebox"> <code class="xml"><bean class="org.apache.ignite.configuration.IgniteConfiguration"> |
| <property name="dataStorageConfiguration"> |
| <bean class="org.apache.ignite.configuration.DataStorageConfiguration"> |
| <property name="defaultDataRegionConfiguration"> |
| <bean class="org.apache.ignite.configuration.DataRegionConfiguration"> |
| <property name="persistenceEnabled" value="true"/> |
| </bean> |
| </property> |
| </bean> |
| </property> |
| </bean></code></pre> |
| </div> |
| <div class="nativecode__tab" data-tab="nativeTabJava"> |
| <pre class="nativecode__codebox"> <code class="java">IgniteConfiguration cfg = new IgniteConfiguration(); |
| |
| DataStorageConfiguration storageCfg = new DataStorageConfiguration(); |
| |
| // Enable Ignite Persistence |
| storageCfg.getDefaultDataRegionConfiguration().setPersistenceEnabled(true); |
| |
| // Using the new storage configuration |
| cfg.setDataStorageConfiguration(storageCfg);</code></pre> |
| </div> |
| <div class="nativecode__tab" data-tab="nativeTabNET"> |
| <pre class="nativecode__codebox"> <code class="csharp">var cfg = new IgniteConfiguration |
| { |
| DataStorageConfiguration = new DataStorageConfiguration |
| { |
| DefaultDataRegionConfiguration = new DataRegionConfiguration |
| { |
| Name = "Default_Region", |
| PersistenceEnabled = true |
| } |
| } |
| };</code></pre> |
| </div> |
| </div> |
| </section> |
| <!-- /.nativecode--> |
| <section class="native-bottom container"> |
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| <article class="nativebotblock"> |
| <h3 class="h4 nativebotblock__title"><img class="nativebotblock__icon" src="/img/features/native-rocket.svg" alt="" /><span>Ready to Start?</span></h3> |
| <p class="nativebotblock__text">Discover more details about native persistence <br />and configure it for your use-case</p> |
| <a class="nativebotblock__link arrowlink" href="https://ignite.apache.org/docs/latest/persistence/native-persistence" target="_blank">Native Persistence Usage and Configuration</a> |
| </article> |
| <article class="nativebotblock nativebotblock--learn"> |
| <h3 class="h4 nativebotblock__title"><img class="nativebotblock__icon" src="/img/features/native-docs.svg" alt="" /><span>Want to Learn More?</span></h3> |
| <p class="nativebotblock__text"> |
| Check out the details of native persistence <br />implementation, <a href="https://www.youtube.com/watch?v=6Yg5QW-XFVc&list=PLMc7NR20hA-I2EfyXeaSRHY5dRFtK_NF0&index=6" target="_blank">or watch a video</a> |
| </p> |
| <a class="nativebotblock__link arrowlink" href="https://cwiki.apache.org/confluence/display/IGNITE/Ignite+Persistent+Store+-+under+the+hood" target="_blank">Native Persistence Implementation Details</a> |
| </article> |
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