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| <title>Apache Ignite - Shared Memory Layer for Spark</title> |
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| <section id="shared-memory-layer" class="page-section"> |
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| <h2 class="first">Shared Memory Layer for Spark</h2> |
| <p> |
| Apache Ignite provides an implementation of Spark RDD abstraction which allows to easily |
| share state in memory across multiple Spark jobs, either within the same application |
| or between different Spark applications. |
| </p> |
| <div class="page-heading">Shared RDDs</div> |
| <p> |
| <code>IgniteRDD</code> is an implementation of native Spark RDD |
| and DataFrame APIs which, in addition to all the standard RDD |
| functionality, also shares the state of the RDD across other |
| Spark jobs, applications and workers. |
| </p> |
| <p> |
| Depending on the pre-configured deployment mode, the shared state may either exist only |
| during the lifespan of a Spark application (<code>embedded mode</code>), or it may out-survive |
| the Spark application (<code>standalone mode</code>), in which case the state can be shared across |
| multiple Spark applications. |
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| <img class="first img-responsive" src="/images/spark-ignite-rdd.png" width="440px" style="float:right;"/> |
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| <div class="page-heading">In-Memory File System</div> |
| <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> |
| <a href="https://apacheignite-fs.readme.io/docs/ignitecontext-igniterdd" target="docs"> |
| <b>Configure Shared Memory Layer <i class="fa fa-angle-double-right"></i></b> |
| </a> |
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