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| <a href="/docs/latest/distributed-computing/executor-service" |
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| class='' |
| >Executor Service</a> |
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| <li> |
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| <a href="/docs/latest/distributed-computing/map-reduce" |
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| class='' |
| >MapReduce API</a> |
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| <li> |
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| <a href="/docs/latest/distributed-computing/load-balancing" |
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| class='' |
| >Load Balancing</a> |
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| <li> |
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| <a href="/docs/latest/distributed-computing/fault-tolerance" |
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| class='' |
| >Fault Tolerance</a> |
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| <li> |
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| <a href="/docs/latest/distributed-computing/job-scheduling" |
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| class='' |
| >Job Scheduling</a> |
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| <a href="/docs/latest/collocated-computations" class='' >Colocating Computations with Data</a> |
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| <a href="/docs/latest/events/listening-to-events" |
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| class='' |
| >Enabling and Listenting to Events</a> |
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| <li> |
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| <a href="/docs/latest/events/events" |
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| <a href="/docs/latest/platform-cache" class='' >.NET Platform Cache</a> |
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| >CountDownLatch</a> |
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| <li><a href="/docs/latest//machine-learning/regression/knn-regression" class=''>k-NN Regression</a></li> |
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| <li><a href="/docs/latest//machine-learning/clustering/introduction" class=''>Introduction</a></li> |
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| <li><a href="/docs/latest//machine-learning/clustering/k-means-clustering" class=''>K-Means Clustering</a></li> |
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| <li><a href="/docs/latest//machine-learning/clustering/gaussian-mixture" class=''>Gaussian mixture (GMM)</a></li> |
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| <li> |
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| <a href="/docs/latest/machine-learning/preprocessing" |
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| >Preprocessing</a> |
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| <li> |
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| <li><a href="/docs/latest//machine-learning/model-selection/introduction" class=''>Introduction</a></li> |
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| <li><a href="/docs/latest//machine-learning/model-selection/split-the-dataset-on-test-and-train-datasets" class=''>Split the dataset on test and train datasets</a></li> |
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| <li><a href="/docs/latest//machine-learning/model-selection/hyper-parameter-tuning" class=''>Hyper-parameter tuning</a></li> |
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| <li><a href="/docs/latest//machine-learning/model-selection/pipeline-api" class=''>Pipeline API</a></li> |
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| <li> |
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| <a href="/docs/latest/machine-learning/multiclass-classification" |
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| class='' |
| >Multiclass Classification</a> |
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| <li> |
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| <li><a href="/docs/latest//machine-learning/ensemble-methods/introduction" class=''></a></li> |
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| <li><a href="/docs/latest//machine-learning/ensemble-methods/baggin" class=''>Bagging</a></li> |
| |
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| <li><a href="/docs/latest//machine-learning/ensemble-methods/random-forest" class=''>Random Forest</a></li> |
| |
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| <li><a href="/docs/latest//machine-learning/ensemble-methods/gradient-boosting" class=''>Gradient Boosting</a></li> |
| |
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| <li> |
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| <a href="/docs/latest/machine-learning/recommendation-systems" |
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| class='' |
| >Recommendation Systems</a> |
| |
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| |
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| <li> |
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| <button |
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| <li><a href="/docs/latest//machine-learning/importing-model/introduction" class=''>Introduction</a></li> |
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| <li><a href="/docs/latest//machine-learning/importing-model/model-import-from-gxboost" class=''>Import Model from XGBoost</a></li> |
| |
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| <li><a href="/docs/latest//machine-learning/importing-model/model-import-from-apache-spark" class=''>Import Model from Apache Spark</a></li> |
| |
| </nav> |
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| </nav> |
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| <a href="/docs/latest/monitoring-metrics/intro" |
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| >Introduction</a> |
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| <li> |
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| <a href="/docs/latest/monitoring-metrics/cluster-id" |
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| <li><a href="/docs/latest//monitoring-metrics/configuring-metrics" class=''>Configuring Metrics</a></li> |
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| <li><a href="/docs/latest//monitoring-metrics/metrics" class=''>JMX Metrics</a></li> |
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| <li><a href="/docs/latest//security/tde" class=''>Introduction</a></li> |
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| <a href="/docs/latest/thin-clients/cpp-thin-client" |
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| >C++ Thin Client</a> |
| |
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| <li> |
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| <a href="/docs/latest/thin-clients/python-thin-client" |
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| class='' |
| >Python Thin Client</a> |
| |
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| <li> |
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| <a href="/docs/latest/thin-clients/php-thin-client" |
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| >PHP Thin Client</a> |
| |
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| <a href="/docs/latest/thin-clients/nodejs-thin-client" |
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| class='' |
| >Node.js Thin Client</a> |
| |
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| |
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| <li><a href="/docs/latest//binary-client-protocol/binary-client-protocol" class=''>Binary Client Protocol</a></li> |
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| |
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| <li><a href="/docs/latest//binary-client-protocol/sql-and-scan-queries" class=''>SQL and Scan Queries</a></li> |
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| <li><a href="/docs/latest//binary-client-protocol/binary-type-metadata" class=''>Binary Types Metadata</a></li> |
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| <li><a href="/docs/latest//binary-client-protocol/cache-configuration" class=''>Cache Configuration</a></li> |
| |
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| <li> |
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| <a href="/docs/latest/SQL/ODBC/odbc-driver" |
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| class='' |
| >ODBC Driver</a> |
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| |
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| <li> |
| |
| <a href="/docs/latest/SQL/ODBC/connection-string-dsn" |
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| class='' |
| >Connection String and DSN</a> |
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| |
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| <li> |
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| <a href="/docs/latest/SQL/ODBC/querying-modifying-data" |
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| class='' |
| >Querying and Modifying Data</a> |
| |
| </li> |
| |
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| <li> |
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| <a href="/docs/latest/SQL/ODBC/specification" |
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| class='' |
| >Specification</a> |
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| </li> |
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| |
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| <li> |
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| <a href="/docs/latest/SQL/ODBC/data-types" |
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| class='' |
| >Data Types</a> |
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| </li> |
| |
| |
| |
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| |
| <li> |
| |
| <a href="/docs/latest/SQL/ODBC/error-codes" |
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| class='' |
| >Error Codes</a> |
| |
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| |
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| <li> |
| |
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| <a href="/docs/latest/restapi" class='' >REST API</a> |
| |
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| <a href="/docs/latest/control-script" class='' >Control Script</a> |
| |
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| <a href="/docs/latest/plugins" class='' >Plugins</a> |
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| |
| <a href="/docs/latest/sqlline" class='' >SQLLine</a> |
| |
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| <button type='button' data-guide-url="" class='group-toggle collapsed '>Ignite for Spark<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
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| <li> |
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| <a href="/docs/latest/ignite-for-spark/overview" |
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| class='' |
| >Overview</a> |
| |
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| |
| <li> |
| |
| <a href="/docs/latest/ignite-for-spark/ignitecontext-and-rdd" |
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| class='' |
| >IgniteContext and IgniteRDD</a> |
| |
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| <article data-swiftype-index='true'> |
| <a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/baseline-topology.adoc" target="_blank">Edit</a> |
| |
| <h1>Baseline Topology</h1> |
| |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The <em>baseline topology</em> is a set of nodes meant to hold data. |
| The concept of baseline topology was introduced to give you the ability to control when you want to |
| <a href="/docs/latest/data-modeling/data-partitioning#rebalancing">rebalance the data in the cluster</a>. For example, if |
| you have a cluster of 3 nodes where the data is distributed between the nodes, and you add 2 more nodes, the rebalancing |
| process re-distributes the data between all 5 nodes. The rebalancing process happens when the |
| baseline topology changes, which can either happen automatically or be triggered manually.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The baseline topology only includes server nodes; client nodes are never included because they do not store data.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The purpose of the baseline topology is to:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Avoid unnecessary data transfer when a server node leaves the cluster for a short period of time, for example, due to |
| occasional network failures or scheduled server maintenance.</p> |
| </li> |
| <li> |
| <p>Give you the ability to control when you want to rebalance the data.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Baseline topology changes automatically when <a href="#baseline-topology-autoadjustment">Baseline Topology Autoadjustment</a> is enabled. This is the default |
| behavior for pure in-memory clusters. For persistent clusters, the baseline topology autoadjustment feature must be enabled |
| manually. By default, it is disabled and you have to change the baseline topology manually. You can change the baseline |
| topology using the <a href="/docs/latest/control-script#activation-deactivation-and-topology-management">control script</a>.</p> |
| </div> |
| <div class="admonitionblock caution"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <div class="title">Caution</div> |
| </td> |
| <td class="content"> |
| <div class="paragraph"> |
| <p>Any attempt to create a cache while the baseline topology is being changed results in an exception. |
| For more details, see <a href="/docs/latest/key-value-api/basic-cache-operations#creating-caches-dynamically">Creating Caches Dynamically</a>.</p> |
| </div> |
| </td> |
| </tr> |
| </table> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="baseline-topology-in-pure-in-memory-clusters">Baseline Topology in Pure In-Memory Clusters</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>In pure in-memory clusters, the default behavior is to adjust the baseline topology to the set of all server nodes |
| automatically when you add or remove server nodes from the cluster. The data is rebalanced automatically, too. |
| You can disable the baseline autoadjustment feature and manage baseline topology manually.</p> |
| </div> |
| <div class="admonitionblock note"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <div class="title">Note</div> |
| </td> |
| <td class="content"> |
| In previous releases, baseline topology was relevant only to clusters with persistence. |
| However, since version 2.8.0, it applies to in-memory clusters as well. |
| If you have a pure in-memory cluster, the transition should be transparent for you because, by default, the baseline topology changes automatically when a server node leaves or joins the cluster. |
| </td> |
| </tr> |
| </table> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="baseline-topology-in-persistent-clusters">Baseline Topology in Persistent Clusters</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>If your cluster has at least one data region in which persistence is enabled, the cluster is inactive when you start it for the first time. |
| In the inactive state, all operations are prohibited. |
| The cluster must be activated before you can create caches and upload data. |
| Cluster activation sets the current set of server nodes as the baseline topology. |
| When you restart the cluster, it is activated automatically as soon as all nodes that are registered in the baseline topology join in. |
| However, if some nodes do not join after a restart, you must to activate the cluster manually.</p> |
| </div> |
| <div class="paragraph"> |
| <p>You can activate the cluster using one of the following tools:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><a href="/docs/latest/control-script#activating-cluster">Control script</a></p> |
| </li> |
| <li> |
| <p><a href="/docs/latest/restapi#change-cluster-state">REST API command</a></p> |
| </li> |
| <li> |
| <p>Programmatically:</p> |
| <code-tabs><code-tab data-tab='Java'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="java"><span class="nc">Ignite</span> <span class="n">ignite</span> <span class="o">=</span> <span class="nc">Ignition</span><span class="o">.</span><span class="na">start</span><span class="o">();</span> |
| |
| <span class="n">ignite</span><span class="o">.</span><span class="na">cluster</span><span class="o">().</span><span class="na">state</span><span class="o">(</span><span class="nc">ClusterState</span><span class="o">.</span><span class="na">ACTIVE</span><span class="o">);</span></code></pre> |
| </div> |
| </div></code-tab><code-tab data-tab='C#/.NET'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="csharp"><span class="n">IIgnite</span> <span class="n">ignite</span> <span class="p">=</span> <span class="n">Ignition</span><span class="p">.</span><span class="nf">Start</span><span class="p">();</span> |
| <span class="n">ignite</span><span class="p">.</span><span class="nf">GetCluster</span><span class="p">().</span><span class="nf">SetActive</span><span class="p">(</span><span class="k">true</span><span class="p">);</span></code></pre> |
| </div> |
| </div></code-tab><code-tab data-tab='C++'></code-tab></code-tabs> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="baseline-topology-autoadjustment">Baseline Topology Autoadjustment</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Instead of changing the baseline topology manually, you can let the cluster do it automatically. This feature is called |
| Baseline Topology Autoadjustment. When it is enabled, the cluster monitors the state of its server nodes and sets the |
| baseline on the current topology automatically when the cluster topology is stable for a configurable period of time.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Here is what happens when the set of nodes in the cluster changes:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>The cluster waits for a configurable amount of time (5 min by default).</p> |
| </li> |
| <li> |
| <p>If there are no other topology changes during this period, Ignite sets the baseline topology to the current set of nodes.</p> |
| </li> |
| <li> |
| <p>If the set of nodes changes during this period, the timeout is updated.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Each change in the set of nodes resets the timeout for autoadjustment. |
| When the timeout expires and the current set of nodes is different from the baseline topology (for example, new nodes |
| are present or some old nodes left), Ignite changes the baseline topology to the current set of nodes. |
| This also triggers data rebalancing.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The autoadjustment timeout allows you to avoid data rebalancing when a node disconnects for a short period due to a |
| temporary network problem or when you want to quickly restart the node. |
| You can set the timeout to a higher value if you expect temporary changes in the set of nodes and don’t want to change |
| the baseline topology.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Baseline topology is autoadjusted only if the cluster is in the active state.</p> |
| </div> |
| <div class="paragraph"> |
| <p>To enable automatic baseline adjustment, you can use the |
| <a href="/docs/latest/control-script#enabling-baseline-topology-autoadjustment">control script</a> or the |
| programmatic API methods shown below:</p> |
| </div> |
| <code-tabs><code-tab data-tab='Java'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="java"><span class="nc">Ignite</span> <span class="n">ignite</span> <span class="o">=</span> <span class="nc">Ignition</span><span class="o">.</span><span class="na">start</span><span class="o">();</span> |
| |
| <span class="n">ignite</span><span class="o">.</span><span class="na">cluster</span><span class="o">().</span><span class="na">baselineAutoAdjustEnabled</span><span class="o">(</span><span class="kc">true</span><span class="o">);</span> |
| |
| <span class="n">ignite</span><span class="o">.</span><span class="na">cluster</span><span class="o">().</span><span class="na">baselineAutoAdjustTimeout</span><span class="o">(</span><span class="mi">30000</span><span class="o">);</span></code></pre> |
| </div> |
| </div></code-tab><code-tab data-tab='C#/.NET'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="csharp"><span class="n">IIgnite</span> <span class="n">ignite</span> <span class="p">=</span> <span class="n">Ignition</span><span class="p">.</span><span class="nf">Start</span><span class="p">();</span> |
| <span class="n">ignite</span><span class="p">.</span><span class="nf">GetCluster</span><span class="p">().</span><span class="nf">SetBaselineAutoAdjustEnabledFlag</span><span class="p">(</span><span class="k">true</span><span class="p">);</span> |
| <span class="n">ignite</span><span class="p">.</span><span class="nf">GetCluster</span><span class="p">().</span><span class="nf">SetBaselineAutoAdjustTimeout</span><span class="p">(</span><span class="m">30000</span><span class="p">);</span></code></pre> |
| </div> |
| </div></code-tab><code-tab data-tab='C++'></code-tab></code-tabs> |
| <div class="paragraph"> |
| <p>To disable automatic baseline adjustment, use the same method with <code>false</code> passed in:</p> |
| </div> |
| <code-tabs><code-tab data-tab='Java'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="java"><span class="n">ignite</span><span class="o">.</span><span class="na">cluster</span><span class="o">().</span><span class="na">baselineAutoAdjustEnabled</span><span class="o">(</span><span class="kc">false</span><span class="o">);</span></code></pre> |
| </div> |
| </div></code-tab><code-tab data-tab='C#/.NET'><div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="csharp"><span class="n">ignite</span><span class="p">.</span><span class="nf">GetCluster</span><span class="p">().</span><span class="nf">SetBaselineAutoAdjustEnabledFlag</span><span class="p">(</span><span class="k">false</span><span class="p">);</span></code></pre> |
| </div> |
| </div></code-tab><code-tab data-tab='C++'></code-tab></code-tabs> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="monitoring-baseline-topology">Monitoring Baseline Topology</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>You can use the following tools to monitor and/or manage the baseline topology:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><a href="/docs/latest/control-script">Control Script</a></p> |
| </li> |
| <li> |
| <p><a href="/docs/latest/monitoring-metrics/metrics#monitoring-topology">JMX Beans</a></p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="copyright"> |
| © 2020 The Apache Software Foundation.<br/> |
| Apache, Apache Ignite, the Apache feather and the Apache Ignite logo are either registered trademarks or trademarks of The Apache Software Foundation. |
| |
| </div> |
| |
| </article> |
| <nav class="right-nav" data-swiftype-index='false'> |
| <ul class="sectlevel1"> |
| <li><a href="#baseline-topology-in-pure-in-memory-clusters">Baseline Topology in Pure In-Memory Clusters</a></li> |
| <li><a href="#baseline-topology-in-persistent-clusters">Baseline Topology in Persistent Clusters</a></li> |
| <li><a href="#baseline-topology-autoadjustment">Baseline Topology Autoadjustment</a></li> |
| <li><a href="#monitoring-baseline-topology">Monitoring Baseline Topology</a></li> |
| </ul> |
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