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| <title>Apache Ignite - In-Memory File System</title> |
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| <main id="main" role="main" class="container"> |
| <section id="igfs" class="page-section"> |
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| <div class="col-sm-6 col-md-6 col-xs-12" style="padding-left:0; padding-right:0"> |
| <h2 class="first">In-Memory File System</h2> |
| <p> |
| One of unique capabilities of Ignite is a distributed in-memory file system called |
| Ignite File System (IGFS). IGFS delivers similar functionality to Hadoop HDFS, but |
| only in memory. In fact, in addition to its own APIs, IGFS implements Hadoop FileSystem API |
| and can be transparently plugged into Hadoop or Spark deployments. |
| </p> |
| <p> |
| IGFS splits the data from each file into separate data blocks and stores them in |
| a distributed in-memory cache. However, unlike Hadoop HDFS, IGFS does not need a name node |
| and automatically determines file data locality using a hashing function. |
| </p> |
| <p> |
| IGFS can be deployed stand alone, as well as on top of HDFS, in which case it becomes |
| a transparent caching layer for the files stored in HDFS. |
| </p> |
| </div> |
| |
| <div class="col-sm-6 col-md-6 col-xs-12" style="padding-right:0"> |
| <img class="first img-responsive" src="/images/spark-igfs.png" width="440px" style="float:right;"/> |
| </div> |
| </div> |
| <div class="page-heading">Tachyon Replacement</div> |
| <p> |
| IGFS can transparently replace Tachyon file system in Spark deployments. Given that IGFS is based |
| on battle-tested Ignite data grid technology, it exhibits much better write and read performance |
| than Tachyon and is more stable. |
| </p> |
| <div class="page-heading">Hadoop File System</div> |
| <p> |
| See <a href="http://apacheignite-fs.readme.io/docs/file-system" target="docs">Hadoop integration documentation</a> if |
| you plan to use IGFS as Hadoop file system. In this case working with IGFS is no different than working |
| with HDFS. |
| </p> |
| <div class="page-heading">GitHub Native API Examples</div> |
| <p> |
| Also see <a href="https://github.com/apache/incubator-ignite/tree/master/examples/src/main/java/org/apache/ignite/examples/igfs" target="github">IGFS native API examples</a> |
| available on GitHub. |
| </p> |
| </section> |
| <section id="key-features" class="page-section"> |
| <h2>Ignite File System Features</h2> |
| <table class="formatted" name="Ignite File System Features"> |
| <thead> |
| <tr> |
| <th width="35%" class="left">Feature</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="left">On-Heap and Off-Heap</td> |
| <td> |
| <p> |
| IGFS allows to store files either on-heap or off-heap. For larger memory spaces |
| it is critical to use off-heap to avoid JVM lengthy garbage collection pauses. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td class="left">IGFS as Hadoop FileSystem</td> |
| <td> |
| <p> |
| IGFS implements Hadoop <code>FileSystem</code> API and can be deployed as a native |
| Hadoop file system, just like HDFS. This allows to natively deploy IGFS into Hadoop or |
| Spark installations in plug-n-play fashion. |
| </p> |
| <div class="page-links"> |
| <a href="http://apacheignite-fs.readme.io/docs/file-system" target="docs">Docs for this Feature <i class="fa fa-angle-double-right"></i></a> |
| </div> |
| </td> |
| </tr> |
| <tr> |
| <td class="left">Hadoop FileSystem Cache</td> |
| <td> |
| <p> |
| IGFS can also be deployed as a <code>caching layer</code> over another Hadoop File System. In this |
| case, if a file is updated IGFS, then update will automatically be written through to |
| HDFS. Also, if a file is read and is not currently in IGFS, it will be automatically |
| loaded from HDFS. |
| </p> |
| <div class="page-links"> |
| <a href="http://apacheignite-fs.readme.io/docs/secondary-file-system" target="docs">Docs for this Feature <i class="fa fa-angle-double-right"></i></a> |
| </div> |
| </td> |
| </tr> |
| <tr> |
| <td class="left">Any Hadoop Distribution</td> |
| <td> |
| <p> |
| IGFS integrates with native Apache Hadoop distribution, as well as Cloudera CDH, and |
| Hortonworks HDP. |
| </p> |
| <div class="page-links" style="line-height: 1.3;"> |
| <a href="http://apacheignite-fs.readme.io/docs/installing-on-apache-hadoop" target="docs">IGFS on Apache Hadoop <i class="fa fa-angle-double-right"></i></a><br/> |
| <a href="http://apacheignite-fs.readme.io/docs/installing-on-cloudera-cdh" target="docs">IGFS on Cloudera CDH <i class="fa fa-angle-double-right"></i></a><br/> |
| <a href="http://apacheignite-fs.readme.io/docs/installing-on-hortonworks-hdp" target="docs">IGFS on Hortonworks HDP <i class="fa fa-angle-double-right"></i></a> |
| </div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </section> |
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