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>.NET/C#</a>
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<a href="/docs/2.11.0/logging"
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<a href="/docs/2.11.0/resources-injection"
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<a href="/docs/2.11.0/starting-nodes" class='' >Starting and Stopping Nodes</a>
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<a href="/docs/2.11.0/clustering/clustering"
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<a href="/docs/2.11.0/clustering/zookeeper-discovery"
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>ZooKeeper Discovery</a>
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<a href="/docs/2.11.0/clustering/connect-client-nodes"
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>Connecting Client Nodes</a>
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<a href="/docs/2.11.0/clustering/baseline-topology"
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>Baseline Topology</a>
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<a href="/docs/2.11.0/thin-clients/dotnet-thin-client"
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>.NET Thin Client</a>
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<a href="/docs/2.11.0/thin-clients/cpp-thin-client"
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>C++ Thin Client</a>
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<a href="/docs/2.11.0/thin-clients/python-thin-client"
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>Python Thin Client</a>
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<a href="/docs/2.11.0/thin-clients/php-thin-client"
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>PHP Thin Client</a>
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<a href="/docs/2.11.0/thin-clients/nodejs-thin-client"
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>Node.js Thin Client</a>
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<li><a href="/docs/2.11.0/binary-client-protocol/key-value-queries" class=''>Key-Value Queries</a></li>
<li><a href="/docs/2.11.0/binary-client-protocol/sql-and-scan-queries" class=''>SQL and Scan Queries</a></li>
<li><a href="/docs/2.11.0/binary-client-protocol/binary-type-metadata" class=''>Binary Types Metadata</a></li>
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<a href="/docs/2.11.0/data-modeling/data-modeling"
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<a href="/docs/2.11.0/data-modeling/data-partitioning"
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>Data Partitioning</a>
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<a href="/docs/2.11.0/data-modeling/affinity-collocation"
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>Affinity Colocation</a>
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<li>
<a href="/docs/2.11.0/data-modeling/binary-marshaller"
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<button type='button' class='group-toggle collapsed '>Configuring Memory<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<a href="/docs/2.11.0/memory-architecture"
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<a href="/docs/2.11.0/memory-configuration/data-regions"
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>Configuring Data Regions</a>
</li>
<li>
<a href="/docs/2.11.0/memory-configuration/eviction-policies"
class=''
>Eviction Policies</a>
</li>
<li>
<a href="/docs/2.11.0/memory-configuration/replacement-policies"
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<button type='button' class='group-toggle collapsed '>Configuring Persistence<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<a href="/docs/2.11.0/persistence/native-persistence"
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<li>
<a href="/docs/2.11.0/persistence/external-storage"
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>External Storage</a>
</li>
<li>
<a href="/docs/2.11.0/persistence/swap"
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>Swapping</a>
</li>
<li>
<a href="/docs/2.11.0/persistence/custom-cache-store"
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>Implementing Custom Cache Store</a>
</li>
<li>
<a href="/docs/2.11.0/persistence/snapshot-directory"
class=''
>Configuring Snapshot Directory</a>
</li>
<li>
<a href="/docs/2.11.0/persistence/disk-compression"
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>Disk Compression</a>
</li>
<li>
<a href="/docs/2.11.0/persistence/persistence-tuning"
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<li>
<a href="/docs/2.11.0/snapshots/snapshots" class='' >Cluster Snapshots</a>
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<button type='button' class='group-toggle collapsed '>Configuring Caches<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<li>
<a href="/docs/2.11.0/configuring-caches/configuration-overview"
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<li>
<a href="/docs/2.11.0/configuring-caches/configuring-backups"
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>Configuring Partition Backups</a>
</li>
<li>
<a href="/docs/2.11.0/configuring-caches/partition-loss-policy"
class=''
>Partition Loss Policy</a>
</li>
<li>
<a href="/docs/2.11.0/configuring-caches/atomicity-modes"
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>Atomicity Modes</a>
</li>
<li>
<a href="/docs/2.11.0/configuring-caches/expiry-policies"
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>Expiry Policy</a>
</li>
<li>
<a href="/docs/2.11.0/configuring-caches/on-heap-caching"
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>On-Heap Caching</a>
</li>
<li>
<a href="/docs/2.11.0/configuring-caches/cache-groups"
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>Cache Groups</a>
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<li>
<a href="/docs/2.11.0/configuring-caches/near-cache"
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</li>
<li>
<a href="/docs/2.11.0/data-rebalancing" class='' >Data Rebalancing</a>
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<li>
<a href="/docs/2.11.0/data-streaming" class='' >Data Streaming</a>
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<li>
<button type='button' class='group-toggle collapsed '>Using Key-Value API<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<a href="/docs/2.11.0/key-value-api/basic-cache-operations"
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<li>
<a href="/docs/2.11.0/key-value-api/binary-objects"
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<li>
<a href="/docs/2.11.0/key-value-api/using-scan-queries"
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>Using Scan Queries</a>
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<li>
<a href="/docs/2.11.0/read-repair"
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>Read Repair</a>
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<li>
<a href="/docs/2.11.0/key-value-api/transactions" class='' >Performing Transactions</a>
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<button type='button' class='group-toggle collapsed '>Working with SQL<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<li>
<a href="/docs/2.11.0/SQL/sql-introduction"
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<a href="/docs/2.11.0/SQL/schemas"
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>Understanding Schemas</a>
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<li>
<a href="/docs/2.11.0/SQL/indexes"
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</li>
<li>
<a href="/docs/2.11.0/SQL/sql-api"
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<li>
<a href="/docs/2.11.0/SQL/distributed-joins"
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>Distributed Joins</a>
</li>
<li>
<a href="/docs/2.11.0/SQL/sql-transactions"
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<a href="/docs/2.11.0/SQL/custom-sql-func"
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<a href="/docs/2.11.0/SQL/JDBC/jdbc-driver"
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>JDBC Driver</a>
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<a href="/docs/2.11.0/SQL/JDBC/jdbc-client-driver"
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<li><a href="/docs/2.11.0/SQL/ODBC/querying-modifying-data" class=''>Querying and Modifying Data</a></li>
<li><a href="/docs/2.11.0/SQL/ODBC/specification" class=''>Specification</a></li>
<li><a href="/docs/2.11.0/SQL/ODBC/data-types" class=''>Data Types</a></li>
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<a href="/docs/2.11.0/transactions/mvcc"
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<a href="/docs/2.11.0/sql-reference/sql-conformance"
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<li>
<a href="/docs/2.11.0/sql-reference/ddl"
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>Data Definition Language (DDL)</a>
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<a href="/docs/2.11.0/sql-reference/dml"
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>Data Manipulation Language (DML)</a>
</li>
<li>
<a href="/docs/2.11.0/sql-reference/transactions"
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>Transactions</a>
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<li>
<a href="/docs/2.11.0/sql-reference/operational-commands"
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>Operational Commands</a>
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<li>
<a href="/docs/2.11.0/sql-reference/aggregate-functions"
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>Aggregate functions</a>
</li>
<li>
<a href="/docs/2.11.0/sql-reference/numeric-functions"
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>Numeric Functions</a>
</li>
<li>
<a href="/docs/2.11.0/sql-reference/string-functions"
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>String Functions</a>
</li>
<li>
<a href="/docs/2.11.0/sql-reference/date-time-functions"
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>Data and Time Functions</a>
</li>
<li>
<a href="/docs/2.11.0/sql-reference/system-functions"
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>System Functions</a>
</li>
<li>
<a href="/docs/2.11.0/sql-reference/data-types"
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<a href="/docs/2.11.0/distributed-computing/distributed-computing"
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<li>
<a href="/docs/2.11.0/distributed-computing/cluster-groups"
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>Cluster Groups</a>
</li>
<li>
<a href="/docs/2.11.0/distributed-computing/executor-service"
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>Executor Service</a>
</li>
<li>
<a href="/docs/2.11.0/distributed-computing/map-reduce"
class=''
>MapReduce API</a>
</li>
<li>
<a href="/docs/2.11.0/distributed-computing/load-balancing"
class=''
>Load Balancing</a>
</li>
<li>
<a href="/docs/2.11.0/distributed-computing/fault-tolerance"
class=''
>Fault Tolerance</a>
</li>
<li>
<a href="/docs/2.11.0/distributed-computing/job-scheduling"
class=''
>Job Scheduling</a>
</li>
<li>
<a href="/docs/2.11.0/distributed-computing/collocated-computations"
class=''
>Colocating Computations with Data</a>
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<button type='button' class='group-toggle collapsed '>Code Deployment<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<a href="/docs/2.11.0/code-deployment/deploying-user-code"
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>Deploying User Code</a>
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<li>
<a href="/docs/2.11.0/code-deployment/peer-class-loading"
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>Peer Class Loading</a>
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<button type='button' class='group-toggle collapsed '>Machine Learning<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<a href="/docs/2.11.0/machine-learning/machine-learning"
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>Machine Learning</a>
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<li>
<a href="/docs/2.11.0/machine-learning/partition-based-dataset"
class=''
>Partition Based Dataset</a>
</li>
<li>
<a href="/docs/2.11.0/machine-learning/updating-trained-models"
class=''
>Updating Trained Models</a>
</li>
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<button
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<li><a href="/docs/2.11.0/machine-learning/binary-classification/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.11.0/machine-learning/binary-classification/linear-svm" class=''>Linear SVM (Support Vector Machine)</a></li>
<li><a href="/docs/2.11.0/machine-learning/binary-classification/decision-trees" class=''>Decision Trees</a></li>
<li><a href="/docs/2.11.0/machine-learning/binary-classification/multilayer-perceptron" class=''>Multilayer Perceptron</a></li>
<li><a href="/docs/2.11.0/machine-learning/binary-classification/logistic-regression" class=''>Logistic Regression</a></li>
<li><a href="/docs/2.11.0/machine-learning/binary-classification/knn-classification" class=''>k-NN Classification</a></li>
<li><a href="/docs/2.11.0/machine-learning/binary-classification/ann" class=''>ANN (Approximate Nearest Neighbor)</a></li>
<li><a href="/docs/2.11.0/machine-learning/binary-classification/naive-bayes" class=''>Naive Bayes</a></li>
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<li>
<button
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<li><a href="/docs/2.11.0/machine-learning/regression/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.11.0/machine-learning/regression/linear-regression" class=''>Linear Regression</a></li>
<li><a href="/docs/2.11.0/machine-learning/regression/decision-trees-regression" class=''>Decision Trees Regression</a></li>
<li><a href="/docs/2.11.0/machine-learning/regression/knn-regression" class=''>k-NN Regression</a></li>
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<li>
<button
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<li><a href="/docs/2.11.0/machine-learning/clustering/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.11.0/machine-learning/clustering/k-means-clustering" class=''>K-Means Clustering</a></li>
<li><a href="/docs/2.11.0/machine-learning/clustering/gaussian-mixture" class=''>Gaussian mixture (GMM)</a></li>
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</li>
<li>
<a href="/docs/2.11.0/machine-learning/preprocessing"
class=''
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<li>
<button
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<li><a href="/docs/2.11.0/machine-learning/model-selection/introduction" class=''>Introduction</a></li>
<li><a href="/docs/2.11.0/machine-learning/model-selection/evaluator" class=''>Evaluator</a></li>
<li><a href="/docs/2.11.0/machine-learning/model-selection/split-the-dataset-on-test-and-train-datasets" class=''>Split the dataset on test and train datasets</a></li>
<li><a href="/docs/2.11.0/machine-learning/model-selection/hyper-parameter-tuning" class=''>Hyper-parameter tuning</a></li>
<li><a href="/docs/2.11.0/machine-learning/model-selection/pipeline-api" class=''>Pipeline API</a></li>
</nav>
</li>
<li>
<a href="/docs/2.11.0/machine-learning/multiclass-classification"
class=''
>Multiclass Classification</a>
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<li>
<button
type='button'
class='collapsed '>Ensemble Methods<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<li><a href="/docs/2.11.0/machine-learning/ensemble-methods/introduction" class=''></a></li>
<li><a href="/docs/2.11.0/machine-learning/ensemble-methods/stacking" class=''>Stacking</a></li>
<li><a href="/docs/2.11.0/machine-learning/ensemble-methods/baggin" class=''>Bagging</a></li>
<li><a href="/docs/2.11.0/machine-learning/ensemble-methods/random-forest" class=''>Random Forest</a></li>
<li><a href="/docs/2.11.0/machine-learning/ensemble-methods/gradient-boosting" class=''>Gradient Boosting</a></li>
</nav>
</li>
<li>
<a href="/docs/2.11.0/machine-learning/recommendation-systems"
class=''
>Recommendation Systems</a>
</li>
<li>
<button
type='button'
class='collapsed '>Importing Model<img class="state-indicator" src="/assets/images/left-nav-arrow.svg" width="6" height="10"></button>
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<article data-swiftype-index='true'>
<a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/clustering/network-configuration.adoc" target="_blank">Edit</a>
<h1>Network Configuration</h1>
<div class="sect1">
<h2 id="ipv4-vs-ipv6">IPv4 vs IPv6</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Ignite tries to support IPv4 and IPv6 but this can sometimes lead to issues where the cluster becomes detached. A possible solution — unless you require IPv6 — is to restrict Ignite to IPv4 by setting the <code>-Djava.net.preferIPv4Stack=true</code> JVM parameter.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="discovery">Discovery</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This section describes the network parameters of the default discovery mechanism, which uses the TCP/IP protocol to exahcange discovery messages and is implemented in the <code>TcpDiscoverySpi</code> class.</p>
</div>
<div class="paragraph">
<p>You can change the properties of the discovery mechanism as follows:</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="cp">&lt;?xml version="1.0" encoding="UTF-8"?&gt;</span>
<span class="c">&lt;!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
--&gt;</span>
<span class="nt">&lt;beans</span> <span class="na">xmlns=</span><span class="s">"http://www.springframework.org/schema/beans"</span> <span class="na">xmlns:util=</span><span class="s">"http://www.springframework.org/schema/util"</span> <span class="na">xmlns:xsi=</span><span class="s">"http://www.w3.org/2001/XMLSchema-instance"</span> <span class="na">xsi:schemaLocation=</span><span class="s">" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.IgniteConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"discoverySpi"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"localPort"</span> <span class="na">value=</span><span class="s">"8300"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/beans&gt;</span></code></pre>
</div>
</div></code-tab><code-tab data-tab='Java'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="java"><span class="nc">IgniteConfiguration</span> <span class="n">cfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">IgniteConfiguration</span><span class="o">();</span>
<span class="nc">TcpDiscoverySpi</span> <span class="n">discoverySpi</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">TcpDiscoverySpi</span><span class="o">().</span><span class="na">setLocalPort</span><span class="o">(</span><span class="mi">8300</span><span class="o">);</span>
<span class="n">cfg</span><span class="o">.</span><span class="na">setDiscoverySpi</span><span class="o">(</span><span class="n">discoverySpi</span><span class="o">);</span>
<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">cfg</span><span class="o">);</span></code></pre>
</div>
</div></code-tab><code-tab data-tab='C#/.NET'></code-tab><code-tab data-tab='C++' data-unavailable='true'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code>This API is not presently available for C++. You can use XML configuration.</code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>The following table describes some most important properties of <code>TcpDiscoverySpi</code>.
You can find the complete list of properties in the <a href="https://ignite.apache.org/releases/2.11.0/javadoc/org/apache/ignite/spi/discovery/tcp/TcpDiscoverySpi.html" target="_blank" rel="noopener">TcpDiscoverySpi</a> javadoc.</p>
</div>
<div class="admonitionblock caution">
<table>
<tr>
<td class="icon">
<div class="title">Caution</div>
</td>
<td class="content">
<div class="paragraph">
<p>You should initialize the <code>IgniteConfiguration.localHost</code> or <code>TcpDiscoverySpi.localAddress</code> parameter with the network
interface that will be used for inter-node communication. By default, a node binds to and listens on all available IP
addresses of an environment it&#8217;s running on. It can prolong node failures detection if some of the node&#8217;s addresses are
not reachable from other cluster nodes.</p>
</div>
</td>
</tr>
</table>
</div>
<table class="tableblock frame-all grid-all stripes-even stretch">
<colgroup>
<col style="width: 25%;">
<col style="width: 50%;">
<col style="width: 25%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Property</th>
<th class="tableblock halign-left valign-top">Description</th>
<th class="tableblock halign-left valign-top">Default Value</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>localAddress</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Local host IP address used for discovery. If set, overrides the <code>IgniteConfiguration.localHost</code> setting.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">By default, a node binds to all available network addresses. If there is a non-loopback address available, then java.net.InetAddress.getLocalHost() is used.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>localPort</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">The port that the node binds to. If set to a non-default value, other cluster nodes must know this port to be able to discover the node.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>47500</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>localPortRange</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">If the <code>localPort</code> is busy, the node attempts to bind to the next port (incremented by 1) and continues this process until it finds a free port. The <code>localPortRange</code> property defines the number of ports the node will try (starting from <code>localPort</code>).</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>100</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>soLinger</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Specifies a linger-on-close timeout of TCP sockets used by Discovery SPI. See Java <code>Socket.setSoLinger</code> API
for details on how to adjust this setting. In Ignite, the timeout defaults to a non-negative value to prevent
<a href="https://bugs.openjdk.java.net/browse/JDK-8219658" target="_blank" rel="noopener">potential deadlocks with SSL connections</a> but,
as a side effect, this can prolong the detection of cluster node failures. Alternatively, update your JRE version to the
one with the SSL issue fixed and adjust this setting accordingly.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>0</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>reconnectCount</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">The number of times the node tries to (re)establish connection to another node.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>10</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>networkTimeout</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">The maximum network timeout in milliseconds for network operations.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>5000</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>socketTimeout</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">The socket operations timeout. This timeout is used to limit connection time and write-to-socket time.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>5000</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>ackTimeout</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">The acknowledgement timeout for discovery messages.
If an acknowledgement is not received within this timeout, the discovery SPI tries to resend the message.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>5000</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>joinTimeout</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">The join timeout defines how much time the node waits to join a cluster. If a non-shared IP finder is used and the node fails to connect to any address from the IP finder, the node keeps trying to join within this timeout. If all addresses are unresponsive, an exception is thrown and the node terminates.
<code>0</code> means waiting indefinitely.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>0</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>statisticsPrintFrequency</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Defines how often the node prints discovery statistics to the log.
<code>0</code> indicates no printing. If the value is greater than 0, and quiet mode is disabled, then statistics is printed out at INFO level once every period.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>0</code></p></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect1">
<h2 id="communication">Communication</h2>
<div class="sectionbody">
<div class="paragraph">
<p>After the nodes discover each other and the cluster is formed, the nodes exchange messages via the communication SPI.
The messages represent distributed cluster operations, such as task execution, data modification operations, queries, etc.
The default implementation of the communication SPI uses the TCP/IP protocol to exchange messages (<code>TcpCommunicationSpi</code>).
This section describes the properties of <code>TcpCommunicationSpi</code>.</p>
</div>
<div class="paragraph">
<p>Each node opens a local communication port and address to which other nodes connect and send messages.
At startup, the node tries to bind to the specified communication port (default is 47100).
If the port is already used, the node increments the port number until it finds a free port.
The number of attempts is defined by the <code>localPortRange</code> property (defaults to 100).</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="cp">&lt;?xml version="1.0" encoding="UTF-8"?&gt;</span>
<span class="c">&lt;!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
--&gt;</span>
<span class="nt">&lt;beans</span> <span class="na">xmlns=</span><span class="s">"http://www.springframework.org/schema/beans"</span> <span class="na">xmlns:util=</span><span class="s">"http://www.springframework.org/schema/util"</span> <span class="na">xmlns:xsi=</span><span class="s">"http://www.w3.org/2001/XMLSchema-instance"</span> <span class="na">xsi:schemaLocation=</span><span class="s">" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.IgniteConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"communicationSpi"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.spi.communication.tcp.TcpCommunicationSpi"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"localPort"</span> <span class="na">value=</span><span class="s">"4321"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/beans&gt;</span></code></pre>
</div>
</div></code-tab><code-tab data-tab='Java'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="java"><span class="nc">TcpCommunicationSpi</span> <span class="n">commSpi</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">TcpCommunicationSpi</span><span class="o">();</span>
<span class="c1">// Set the local port.</span>
<span class="n">commSpi</span><span class="o">.</span><span class="na">setLocalPort</span><span class="o">(</span><span class="mi">4321</span><span class="o">);</span>
<span class="nc">IgniteConfiguration</span> <span class="n">cfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">IgniteConfiguration</span><span class="o">();</span>
<span class="n">cfg</span><span class="o">.</span><span class="na">setCommunicationSpi</span><span class="o">(</span><span class="n">commSpi</span><span class="o">);</span>
<span class="c1">// Start the node.</span>
<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">cfg</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="kt">var</span> <span class="n">cfg</span> <span class="p">=</span> <span class="k">new</span> <span class="n">IgniteConfiguration</span>
<span class="p">{</span>
<span class="n">CommunicationSpi</span> <span class="p">=</span> <span class="k">new</span> <span class="n">TcpCommunicationSpi</span>
<span class="p">{</span>
<span class="n">LocalPort</span> <span class="p">=</span> <span class="m">1234</span>
<span class="p">}</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">cfg</span><span class="p">);</span></code></pre>
</div>
</div></code-tab><code-tab data-tab='C++' data-unavailable='true'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code>This API is not presently available for C++. You can use XML configuration.</code></pre>
</div>
</div></code-tab></code-tabs>
<div class="paragraph">
<p>Below is a list of some important properties of <code>TcpCommunicationSpi</code>.
You can find the list of all properties in the <a href="https://ignite.apache.org/releases/2.11.0/javadoc/org/apache/ignite/spi/communication/tcp/TcpCommunicationSpi.html" target="_blank" rel="noopener">TcpCommunicationSpi</a> javadoc.</p>
</div>
<table class="tableblock frame-all grid-all stripes-even stretch">
<colgroup>
<col style="width: 25%;">
<col style="width: 50%;">
<col style="width: 25%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Property</th>
<th class="tableblock halign-left valign-top">Description</th>
<th class="tableblock halign-left valign-top">Default Value</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>localAddress</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">The local address for the communication SPI to bind to. If set, overrides the <code>IgniteConfiguration.localHost</code> setting.</p></td>
<td class="tableblock halign-left valign-top"></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>localPort</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">The local port that the node uses for communication.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>47100</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>localPortRange</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">The range of ports the nodes tries to bind to sequentially until it finds a free one.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>100</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>tcpNoDelay</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Sets the value for the <code>TCP_NODELAY</code> socket option. Each socket accepted or created will use the provided value.</p>
<p class="tableblock">The option should be set to <code>true</code> (default) to reduce request/response time during communication over TCP. In most cases we do not recommend changing this option.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>true</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>idleConnectionTimeout</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">The maximum idle connection timeout (in milliseconds) after which the connection is closed.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>600000</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>usePairedConnections</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Whether dual socket connection between the nodes should be enforced. If set to <code>true</code>, two separate connections will be established between the communicating nodes: one for outgoing messages, and one for incoming messages. When set to <code>false</code>, a single TCP connection will be used for both directions.
This flag is useful on some operating systems when messages take too long to be delivered.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>false</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>directBuffer</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">A boolean flag that indicates whether to allocate NIO direct buffer instead of NIO heap allocation buffer. Although direct buffers perform better, in some cases (especially on Windows) they may cause JVM crashes. If that happens in your environment, set this property to <code>false</code>.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>true</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>directSendBuffer</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Whether to use NIO direct buffer instead of NIO heap allocation buffer when sending messages.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>false</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>socketReceiveBuffer</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Receive buffer size for sockets created or accepted by the communication SPI. If set to <code>0</code>, the operating system&#8217;s default value is used.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>0</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>socketSendBuffer</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Send buffer size for sockets created or accepted by the communication SPI. If set to <code>0</code> the operating system&#8217;s default value is used.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>0</code></p></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect1">
<h2 id="connection-timeouts">Connection Timeouts</h2>
<div class="sectionbody">
<div class="paragraph">
<p>There are several properties that define connection timeouts:</p>
</div>
<table class="tableblock frame-all grid-all stripes-even stretch">
<colgroup>
<col style="width: 33.3333%;">
<col style="width: 33.3333%;">
<col style="width: 33.3334%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">Property</th>
<th class="tableblock halign-left valign-top">Description</th>
<th class="tableblock halign-left valign-top">Default Value</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>IgniteConfiguration.failureDetectionTimeout</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">A timeout for basic network operations for server nodes.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>10000</code></p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>IgniteConfiguration.clientFailureDetectionTimeout</code></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">A timeout for basic network operations for client nodes.</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock"><code>30000</code></p></td>
</tr>
</tbody>
</table>
<div class="paragraph">
<p>You can set the failure detection timeout in the node configuration as shown in the example below.
The default values allow the discovery SPI to work reliably on most on-premise and containerized deployments.
However, in stable low-latency networks, you can set the parameter to ~200 milliseconds in order to detect and react to​ failures more quickly.</p>
</div>
<code-tabs><code-tab data-tab='XML'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="xml"><span class="cp">&lt;?xml version="1.0" encoding="UTF-8"?&gt;</span>
<span class="c">&lt;!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
--&gt;</span>
<span class="nt">&lt;beans</span> <span class="na">xmlns=</span><span class="s">"http://www.springframework.org/schema/beans"</span> <span class="na">xmlns:util=</span><span class="s">"http://www.springframework.org/schema/util"</span> <span class="na">xmlns:xsi=</span><span class="s">"http://www.w3.org/2001/XMLSchema-instance"</span> <span class="na">xsi:schemaLocation=</span><span class="s">" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd"</span><span class="nt">&gt;</span>
<span class="nt">&lt;bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.IgniteConfiguration"</span><span class="nt">&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"failureDetectionTimeout"</span> <span class="na">value=</span><span class="s">"5000"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"clientFailureDetectionTimeout"</span> <span class="na">value=</span><span class="s">"10000"</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/bean&gt;</span>
<span class="nt">&lt;/beans&gt;</span></code></pre>
</div>
</div></code-tab><code-tab data-tab='Java'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="java"><span class="nc">IgniteConfiguration</span> <span class="n">cfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">IgniteConfiguration</span><span class="o">();</span>
<span class="n">cfg</span><span class="o">.</span><span class="na">setFailureDetectionTimeout</span><span class="o">(</span><span class="mi">5_000</span><span class="o">);</span>
<span class="n">cfg</span><span class="o">.</span><span class="na">setClientFailureDetectionTimeout</span><span class="o">(</span><span class="mi">10_000</span><span class="o">);</span></code></pre>
</div>
</div></code-tab><code-tab data-tab='C#/.NET'></code-tab><code-tab data-tab='C++' data-unavailable='true'><div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code>This API is not presently available for C++. You can use XML configuration.</code></pre>
</div>
</div></code-tab></code-tabs>
</div>
</div>
<div class="copyright">
© 2021 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.
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<li><a href="#ipv4-vs-ipv6">IPv4 vs IPv6</a></li>
<li><a href="#discovery">Discovery</a></li>
<li><a href="#communication">Communication</a></li>
<li><a href="#connection-timeouts">Connection Timeouts</a></li>
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