| |
| <!DOCTYPE HTML> |
| <html lang="" > |
| <head> |
| <title>Avoiding Network Isolation ยท ActiveMQ Artemis Documentation</title> |
| <meta charset="UTF-8"> |
| <meta http-equiv="X-UA-Compatible" content="IE=edge" /> |
| <meta content="text/html; charset=utf-8" http-equiv="Content-Type"> |
| <meta name="description" content=""> |
| <meta name="generator" content="GitBook 3.1.1"> |
| |
| |
| |
| |
| <link rel="stylesheet" href="gitbook/style.css"> |
| |
| |
| |
| |
| <link rel="stylesheet" href="gitbook/gitbook-plugin-highlight/website.css"> |
| |
| |
| |
| <link rel="stylesheet" href="gitbook/gitbook-plugin-search/search.css"> |
| |
| |
| |
| <link rel="stylesheet" href="gitbook/gitbook-plugin-fontsettings/website.css"> |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| <meta name="HandheldFriendly" content="true"/> |
| <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no"> |
| <meta name="apple-mobile-web-app-capable" content="yes"> |
| <meta name="apple-mobile-web-app-status-bar-style" content="black"> |
| <link rel="apple-touch-icon-precomposed" sizes="152x152" href="gitbook/images/apple-touch-icon-precomposed-152.png"> |
| <link rel="shortcut icon" href="gitbook/images/favicon.ico" type="image/x-icon"> |
| |
| |
| <link rel="next" href="critical-analysis.html" /> |
| |
| |
| <link rel="prev" href="slow-consumers.html" /> |
| |
| |
| </head> |
| <body> |
| |
| <div class="book"> |
| <div class="book-summary"> |
| |
| |
| <div id="book-search-input" role="search"> |
| <input type="text" placeholder="Type to search" /> |
| </div> |
| |
| |
| <nav role="navigation"> |
| |
| |
| |
| <ul class="summary"> |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| <li class="chapter " data-level="1.1" data-path="./"> |
| |
| <a href="./"> |
| |
| |
| Introduction |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.2" data-path="notice.html"> |
| |
| <a href="notice.html"> |
| |
| |
| Legal Notice |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.3" data-path="preface.html"> |
| |
| <a href="preface.html"> |
| |
| |
| Preface |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.4" data-path="project-info.html"> |
| |
| <a href="project-info.html"> |
| |
| |
| Project Info |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.5" data-path="versions.html"> |
| |
| <a href="versions.html"> |
| |
| |
| Versions |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.6" data-path="messaging-concepts.html"> |
| |
| <a href="messaging-concepts.html"> |
| |
| |
| Messaging Concepts |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.7" data-path="architecture.html"> |
| |
| <a href="architecture.html"> |
| |
| |
| Architecture |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.8" data-path="using-server.html"> |
| |
| <a href="using-server.html"> |
| |
| |
| Using the Server |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.9" data-path="upgrading.html"> |
| |
| <a href="upgrading.html"> |
| |
| |
| Upgrading |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.10" data-path="address-model.html"> |
| |
| <a href="address-model.html"> |
| |
| |
| Address Model |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.11" data-path="protocols-interoperability.html"> |
| |
| <a href="protocols-interoperability.html"> |
| |
| |
| Protocols and Interoperability |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.12" data-path="amqp.html"> |
| |
| <a href="amqp.html"> |
| |
| |
| AMQP |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.13" data-path="mqtt.html"> |
| |
| <a href="mqtt.html"> |
| |
| |
| MQTT |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.14" data-path="stomp.html"> |
| |
| <a href="stomp.html"> |
| |
| |
| STOMP |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.15" data-path="openwire.html"> |
| |
| <a href="openwire.html"> |
| |
| |
| OpenWire |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.16" data-path="core.html"> |
| |
| <a href="core.html"> |
| |
| |
| Core |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.17" data-path="jms-core-mapping.html"> |
| |
| <a href="jms-core-mapping.html"> |
| |
| |
| Mapping JMS Concepts to the Core API |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.18" data-path="using-jms.html"> |
| |
| <a href="using-jms.html"> |
| |
| |
| Using JMS |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.19" data-path="client-classpath.html"> |
| |
| <a href="client-classpath.html"> |
| |
| |
| The Client Classpath |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.20" data-path="examples.html"> |
| |
| <a href="examples.html"> |
| |
| |
| Examples |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.21" data-path="wildcard-routing.html"> |
| |
| <a href="wildcard-routing.html"> |
| |
| |
| Routing Messages With Wild Cards |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.22" data-path="wildcard-syntax.html"> |
| |
| <a href="wildcard-syntax.html"> |
| |
| |
| Wildcard Syntax |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.23" data-path="filter-expressions.html"> |
| |
| <a href="filter-expressions.html"> |
| |
| |
| Filter Expressions |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.24" data-path="persistence.html"> |
| |
| <a href="persistence.html"> |
| |
| |
| Persistence |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.25" data-path="configuring-transports.html"> |
| |
| <a href="configuring-transports.html"> |
| |
| |
| Configuring Transports |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.26" data-path="config-reload.html"> |
| |
| <a href="config-reload.html"> |
| |
| |
| Configuration Reload |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.27" data-path="connection-ttl.html"> |
| |
| <a href="connection-ttl.html"> |
| |
| |
| Detecting Dead Connections |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.28" data-path="slow-consumers.html"> |
| |
| <a href="slow-consumers.html"> |
| |
| |
| Detecting Slow Consumers |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter active" data-level="1.29" data-path="network-isolation.html"> |
| |
| <a href="network-isolation.html"> |
| |
| |
| Avoiding Network Isolation |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.30" data-path="critical-analysis.html"> |
| |
| <a href="critical-analysis.html"> |
| |
| |
| Detecting Broker Issues (Critical Analysis) |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.31" data-path="transaction-config.html"> |
| |
| <a href="transaction-config.html"> |
| |
| |
| Resource Manager Configuration |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.32" data-path="flow-control.html"> |
| |
| <a href="flow-control.html"> |
| |
| |
| Flow Control |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.33" data-path="send-guarantees.html"> |
| |
| <a href="send-guarantees.html"> |
| |
| |
| Guarantees of sends and commits |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.34" data-path="undelivered-messages.html"> |
| |
| <a href="undelivered-messages.html"> |
| |
| |
| Message Redelivery and Undelivered Messages |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.35" data-path="message-expiry.html"> |
| |
| <a href="message-expiry.html"> |
| |
| |
| Message Expiry |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.36" data-path="large-messages.html"> |
| |
| <a href="large-messages.html"> |
| |
| |
| Large Messages |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.37" data-path="paging.html"> |
| |
| <a href="paging.html"> |
| |
| |
| Paging |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.38" data-path="scheduled-messages.html"> |
| |
| <a href="scheduled-messages.html"> |
| |
| |
| Scheduled Messages |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.39" data-path="last-value-queues.html"> |
| |
| <a href="last-value-queues.html"> |
| |
| |
| Last-Value Queues |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.40" data-path="ring-queues.html"> |
| |
| <a href="ring-queues.html"> |
| |
| |
| Ring Queues |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.41" data-path="retroactive-addresses.html"> |
| |
| <a href="retroactive-addresses.html"> |
| |
| |
| Retroactive Addresses |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.42" data-path="exclusive-queues.html"> |
| |
| <a href="exclusive-queues.html"> |
| |
| |
| Exclusive Queues |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.43" data-path="message-grouping.html"> |
| |
| <a href="message-grouping.html"> |
| |
| |
| Message Grouping |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.44" data-path="consumer-priority.html"> |
| |
| <a href="consumer-priority.html"> |
| |
| |
| Consumer Priority |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.45" data-path="pre-acknowledge.html"> |
| |
| <a href="pre-acknowledge.html"> |
| |
| |
| Extra Acknowledge Modes |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.46" data-path="management.html"> |
| |
| <a href="management.html"> |
| |
| |
| Management |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.47" data-path="management-console.html"> |
| |
| <a href="management-console.html"> |
| |
| |
| Management Console |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.48" data-path="metrics.html"> |
| |
| <a href="metrics.html"> |
| |
| |
| Metrics |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.49" data-path="security.html"> |
| |
| <a href="security.html"> |
| |
| |
| Security |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.50" data-path="masking-passwords.html"> |
| |
| <a href="masking-passwords.html"> |
| |
| |
| Masking Passwords |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.51" data-path="broker-plugins.html"> |
| |
| <a href="broker-plugins.html"> |
| |
| |
| Broker Plugins |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.52" data-path="resource-limits.html"> |
| |
| <a href="resource-limits.html"> |
| |
| |
| Resource Limits |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.53" data-path="jms-bridge.html"> |
| |
| <a href="jms-bridge.html"> |
| |
| |
| The JMS Bridge |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.54" data-path="client-reconnection.html"> |
| |
| <a href="client-reconnection.html"> |
| |
| |
| Client Reconnection and Session Reattachment |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.55" data-path="diverts.html"> |
| |
| <a href="diverts.html"> |
| |
| |
| Diverting and Splitting Message Flows |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.56" data-path="core-bridges.html"> |
| |
| <a href="core-bridges.html"> |
| |
| |
| Core Bridges |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.57" data-path="transformers.html"> |
| |
| <a href="transformers.html"> |
| |
| |
| Transformers |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.58" data-path="duplicate-detection.html"> |
| |
| <a href="duplicate-detection.html"> |
| |
| |
| Duplicate Message Detection |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.59" data-path="clusters.html"> |
| |
| <a href="clusters.html"> |
| |
| |
| Clusters |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.60" data-path="federation.html"> |
| |
| <a href="federation.html"> |
| |
| |
| Federation |
| |
| </a> |
| |
| |
| |
| <ul class="articles"> |
| |
| |
| <li class="chapter " data-level="1.60.1" data-path="federation-address.html"> |
| |
| <a href="federation-address.html"> |
| |
| |
| Address Federation |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.60.2" data-path="federation-queue.html"> |
| |
| <a href="federation-queue.html"> |
| |
| |
| Queue Federation |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| |
| </ul> |
| |
| </li> |
| |
| <li class="chapter " data-level="1.61" data-path="ha.html"> |
| |
| <a href="ha.html"> |
| |
| |
| High Availability and Failover |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.62" data-path="graceful-shutdown.html"> |
| |
| <a href="graceful-shutdown.html"> |
| |
| |
| Graceful Server Shutdown |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.63" data-path="libaio.html"> |
| |
| <a href="libaio.html"> |
| |
| |
| Libaio Native Libraries |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.64" data-path="thread-pooling.html"> |
| |
| <a href="thread-pooling.html"> |
| |
| |
| Thread management |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.65" data-path="web-server.html"> |
| |
| <a href="web-server.html"> |
| |
| |
| Embedded Web Server |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.66" data-path="logging.html"> |
| |
| <a href="logging.html"> |
| |
| |
| Logging |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.67" data-path="rest.html"> |
| |
| <a href="rest.html"> |
| |
| |
| REST Interface |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.68" data-path="embedding-activemq.html"> |
| |
| <a href="embedding-activemq.html"> |
| |
| |
| Embedding the Broker |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.69" data-path="karaf.html"> |
| |
| <a href="karaf.html"> |
| |
| |
| Apache Karaf |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.70" data-path="tomcat.html"> |
| |
| <a href="tomcat.html"> |
| |
| |
| Apache Tomcat |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.71" data-path="spring-integration.html"> |
| |
| <a href="spring-integration.html"> |
| |
| |
| Spring Integration |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.72" data-path="cdi-integration.html"> |
| |
| <a href="cdi-integration.html"> |
| |
| |
| CDI Integration |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.73" data-path="intercepting-operations.html"> |
| |
| <a href="intercepting-operations.html"> |
| |
| |
| Intercepting Operations |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.74" data-path="data-tools.html"> |
| |
| <a href="data-tools.html"> |
| |
| |
| Data Tools |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.75" data-path="maven-plugin.html"> |
| |
| <a href="maven-plugin.html"> |
| |
| |
| Maven Plugin |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.76" data-path="unit-testing.html"> |
| |
| <a href="unit-testing.html"> |
| |
| |
| Unit Testing |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.77" data-path="perf-tuning.html"> |
| |
| <a href="perf-tuning.html"> |
| |
| |
| Troubleshooting and Performance Tuning |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| <li class="chapter " data-level="1.78" data-path="configuration-index.html"> |
| |
| <a href="configuration-index.html"> |
| |
| |
| Configuration Reference |
| |
| </a> |
| |
| |
| |
| </li> |
| |
| |
| |
| |
| <li class="divider"></li> |
| |
| <li> |
| <a href="https://www.gitbook.com" target="blank" class="gitbook-link"> |
| Published with GitBook |
| </a> |
| </li> |
| </ul> |
| |
| |
| </nav> |
| |
| |
| </div> |
| |
| <div class="book-body"> |
| |
| <div class="body-inner"> |
| |
| |
| |
| <div class="book-header" role="navigation"> |
| |
| |
| <!-- Title --> |
| <h1> |
| <i class="fa fa-circle-o-notch fa-spin"></i> |
| <a href="." >Avoiding Network Isolation</a> |
| </h1> |
| </div> |
| |
| |
| |
| |
| <div class="page-wrapper" tabindex="-1" role="main"> |
| <div class="page-inner"> |
| |
| <div id="book-search-results"> |
| <div class="search-noresults"> |
| |
| <section class="normal markdown-section"> |
| |
| <h1 id="network-isolation-split-brain">Network Isolation (Split Brain)</h1> |
| <p>It is possible that if a replicated live or backup server becomes isolated in a |
| network that failover will occur and you will end up with 2 live servers |
| serving messages in a cluster, this we call split brain. There are different |
| configurations you can choose from that will help mitigate this problem</p> |
| <h2 id="quorum-voting">Quorum Voting</h2> |
| <p>Quorum voting is used by both the live and the backup to decide what to do if a |
| replication connection is disconnected. Basically the server will request each |
| live server in the cluster to vote as to whether it thinks the server it is |
| replicating to or from is still alive. You can also configure the time for which |
| the quorum manager will wait for the quorum vote response. The default time is 30 |
| seconds you can configure like so for master and also for the slave:</p> |
| <pre><code class="lang-xml"><span class="hljs-tag"><<span class="hljs-name">ha-policy</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">replication</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">master</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">quorum-vote-wait</span>></span>12<span class="hljs-tag"></<span class="hljs-name">quorum-vote-wait</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">master</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">replication</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">ha-policy</span>></span> |
| </code></pre> |
| <p>This being the case the minimum number of live/backup pairs needed is 3. If less |
| than 3 pairs are used then the only option is to use a Network Pinger which is |
| explained later in this chapter or choose how you want each server to react which |
| the following details:</p> |
| <h3 id="backup-voting">Backup Voting</h3> |
| <p>By default if a replica loses its replication connection to the live broker it |
| makes a decision as to whether to start or not with a quorum vote. This of |
| course requires that there be at least 3 pairs of live/backup nodes in the |
| cluster. For a 3 node cluster it will start if it gets 2 votes back saying that |
| its live server is no longer available, for 4 nodes this would be 3 votes and |
| so on. When a backup loses connection to the master it will keep voting for a |
| quorum until it either receives a vote allowing it to start or it detects that |
| the master is still live. for the latter it will then restart as a backup. How |
| many votes and how long between each vote the backup should wait is configured |
| like so:</p> |
| <pre><code class="lang-xml"><span class="hljs-tag"><<span class="hljs-name">ha-policy</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">replication</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">slave</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">vote-retries</span>></span>12<span class="hljs-tag"></<span class="hljs-name">vote-retries</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">vote-retry-wait</span>></span>5000<span class="hljs-tag"></<span class="hljs-name">vote-retry-wait</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">slave</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">replication</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">ha-policy</span>></span> |
| </code></pre> |
| <p>It's also possible to statically set the quorum size that should be used for |
| the case where the cluster size is known up front, this is done on the Replica |
| Policy like so:</p> |
| <pre><code class="lang-xml"><span class="hljs-tag"><<span class="hljs-name">ha-policy</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">replication</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">slave</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">quorum-size</span>></span>2<span class="hljs-tag"></<span class="hljs-name">quorum-size</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">slave</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">replication</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">ha-policy</span>></span> |
| </code></pre> |
| <p>In this example the quorum size is set to 2 so if you were using a single pair |
| and the backup lost connectivity it would never start.</p> |
| <h3 id="live-voting">Live Voting</h3> |
| <p>By default, if the live server loses its replication connection then it will |
| just carry on and wait for a backup to reconnect and start replicating again. |
| In the event of a possible split brain scenario this may mean that the live |
| stays live even though the backup has been activated. It is possible to |
| configure the live server to vote for a quorum if this happens, in this way if |
| the live server doesn't not receive a majority vote then it will shutdown. This |
| is done by setting the <em>vote-on-replication-failure</em> to true.</p> |
| <pre><code class="lang-xml"><span class="hljs-tag"><<span class="hljs-name">ha-policy</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">replication</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">master</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">vote-on-replication-failure</span>></span>true<span class="hljs-tag"></<span class="hljs-name">vote-on-replication-failure</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">quorum-size</span>></span>2<span class="hljs-tag"></<span class="hljs-name">quorum-size</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">master</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">replication</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">ha-policy</span>></span> |
| </code></pre> |
| <p>As in the backup policy it is also possible to statically configure the quorum |
| size.</p> |
| <h2 id="pinging-the-network">Pinging the network</h2> |
| <p>You may configure one more addresses on the broker.xml that are part of your |
| network topology, that will be pinged through the life cycle of the server.</p> |
| <p>The server will stop itself until the network is back on such case.</p> |
| <p>If you execute the create command passing a -ping argument, you will create a |
| default xml that is ready to be used with network checks:</p> |
| <pre><code>./artemis create /myDir/myServer --ping 10.0.0.1 |
| </code></pre><p>This XML part will be added to your broker.xml:</p> |
| <pre><code class="lang-xml"><span class="hljs-comment"><!-- |
| You can verify the network health of a particular NIC by specifying the <network-check-NIC> element. |
| <network-check-NIC>theNicName</network-check-NIC> |
| --></span> |
| |
| <span class="hljs-comment"><!-- |
| Use this to use an HTTP server to validate the network |
| <network-check-URL-list>http://www.apache.org</network-check-URL-list> --></span> |
| |
| <span class="hljs-tag"><<span class="hljs-name">network-check-period</span>></span>10000<span class="hljs-tag"></<span class="hljs-name">network-check-period</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">network-check-timeout</span>></span>1000<span class="hljs-tag"></<span class="hljs-name">network-check-timeout</span>></span> |
| |
| <span class="hljs-comment"><!-- this is a comma separated list, no spaces, just DNS or IPs |
| it should accept IPV6 |
| |
| Warning: Make sure you understand your network topology as this is meant to check if your network is up. |
| Using IPs that could eventually disappear or be partially visible may defeat the purpose. |
| You can use a list of multiple IPs, any successful ping will make the server OK to continue running --></span> |
| <span class="hljs-tag"><<span class="hljs-name">network-check-list</span>></span>10.0.0.1<span class="hljs-tag"></<span class="hljs-name">network-check-list</span>></span> |
| |
| <span class="hljs-comment"><!-- use this to customize the ping used for ipv4 addresses --></span> |
| <span class="hljs-tag"><<span class="hljs-name">network-check-ping-command</span>></span>ping -c 1 -t %d %s<span class="hljs-tag"></<span class="hljs-name">network-check-ping-command</span>></span> |
| |
| <span class="hljs-comment"><!-- use this to customize the ping used for ipv addresses --></span> |
| <span class="hljs-tag"><<span class="hljs-name">network-check-ping6-command</span>></span>ping6 -c 1 %2$s<span class="hljs-tag"></<span class="hljs-name">network-check-ping6-command</span>></span> |
| </code></pre> |
| <p>Once you lose connectivity towards 10.0.0.1 on the given example, you will see |
| see this output at the server:</p> |
| <pre><code>09:49:24,562 WARN [org.apache.activemq.artemis.core.server.NetworkHealthCheck] Ping Address /10.0.0.1 wasn't reacheable |
| 09:49:36,577 INFO [org.apache.activemq.artemis.core.server.NetworkHealthCheck] Network is unhealthy, stopping service ActiveMQServerImpl::serverUUID=04fd5dd8-b18c-11e6-9efe-6a0001921ad0 |
| 09:49:36,625 INFO [org.apache.activemq.artemis.core.server] AMQ221002: Apache ActiveMQ Artemis Message Broker version 1.6.0 [04fd5dd8-b18c-11e6-9efe-6a0001921ad0] stopped, uptime 14.787 seconds |
| 09:50:00,653 WARN [org.apache.activemq.artemis.core.server.NetworkHealthCheck] ping: sendto: No route to host |
| 09:50:10,656 WARN [org.apache.activemq.artemis.core.server.NetworkHealthCheck] Host is down: java.net.ConnectException: Host is down |
| at java.net.Inet6AddressImpl.isReachable0(Native Method) [rt.jar:1.8.0_73] |
| at java.net.Inet6AddressImpl.isReachable(Inet6AddressImpl.java:77) [rt.jar:1.8.0_73] |
| at java.net.InetAddress.isReachable(InetAddress.java:502) [rt.jar:1.8.0_73] |
| at org.apache.activemq.artemis.core.server.NetworkHealthCheck.check(NetworkHealthCheck.java:295) [artemis-commons-1.6.0-SNAPSHOT.jar:1.6.0-SNAPSHOT] |
| at org.apache.activemq.artemis.core.server.NetworkHealthCheck.check(NetworkHealthCheck.java:276) [artemis-commons-1.6.0-SNAPSHOT.jar:1.6.0-SNAPSHOT] |
| at org.apache.activemq.artemis.core.server.NetworkHealthCheck.run(NetworkHealthCheck.java:244) [artemis-commons-1.6.0-SNAPSHOT.jar:1.6.0-SNAPSHOT] |
| at org.apache.activemq.artemis.core.server.ActiveMQScheduledComponent$2.run(ActiveMQScheduledComponent.java:189) [artemis-commons-1.6.0-SNAPSHOT.jar:1.6.0-SNAPSHOT] |
| at org.apache.activemq.artemis.core.server.ActiveMQScheduledComponent$3.run(ActiveMQScheduledComponent.java:199) [artemis-commons-1.6.0-SNAPSHOT.jar:1.6.0-SNAPSHOT] |
| at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [rt.jar:1.8.0_73] |
| at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) [rt.jar:1.8.0_73] |
| at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) [rt.jar:1.8.0_73] |
| at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) [rt.jar:1.8.0_73] |
| at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [rt.jar:1.8.0_73] |
| at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [rt.jar:1.8.0_73] |
| at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_73] |
| </code></pre><p>Once you re establish your network connections towards the configured check list:</p> |
| <pre><code>09:53:23,461 INFO [org.apache.activemq.artemis.core.server.NetworkHealthCheck] Network is healthy, starting service ActiveMQServerImpl:: |
| 09:53:23,462 INFO [org.apache.activemq.artemis.core.server] AMQ221000: live Message Broker is starting with configuration Broker Configuration (clustered=false,journalDirectory=./data/journal,bindingsDirectory=./data/bindings,largeMessagesDirectory=./data/large-messages,pagingDirectory=./data/paging) |
| 09:53:23,462 INFO [org.apache.activemq.artemis.core.server] AMQ221013: Using NIO Journal |
| 09:53:23,462 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-server]. Adding protocol support for: CORE |
| 09:53:23,463 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-amqp-protocol]. Adding protocol support for: AMQP |
| 09:53:23,463 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-hornetq-protocol]. Adding protocol support for: HORNETQ |
| 09:53:23,463 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-mqtt-protocol]. Adding protocol support for: MQTT |
| 09:53:23,464 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-openwire-protocol]. Adding protocol support for: OPENWIRE |
| 09:53:23,464 INFO [org.apache.activemq.artemis.core.server] AMQ221043: Protocol module found: [artemis-stomp-protocol]. Adding protocol support for: STOMP |
| 09:53:23,541 INFO [org.apache.activemq.artemis.core.server] AMQ221003: Deploying queue jms.queue.DLQ |
| 09:53:23,541 INFO [org.apache.activemq.artemis.core.server] AMQ221003: Deploying queue jms.queue.ExpiryQueue |
| 09:53:23,549 INFO [org.apache.activemq.artemis.core.server] AMQ221020: Started Acceptor at 0.0.0.0:61616 for protocols [CORE,MQTT,AMQP,STOMP,HORNETQ,OPENWIRE] |
| 09:53:23,550 INFO [org.apache.activemq.artemis.core.server] AMQ221020: Started Acceptor at 0.0.0.0:5445 for protocols [HORNETQ,STOMP] |
| 09:53:23,554 INFO [org.apache.activemq.artemis.core.server] AMQ221020: Started Acceptor at 0.0.0.0:5672 for protocols [AMQP] |
| 09:53:23,555 INFO [org.apache.activemq.artemis.core.server] AMQ221020: Started Acceptor at 0.0.0.0:1883 for protocols [MQTT] |
| 09:53:23,556 INFO [org.apache.activemq.artemis.core.server] AMQ221020: Started Acceptor at 0.0.0.0:61613 for protocols [STOMP] |
| 09:53:23,556 INFO [org.apache.activemq.artemis.core.server] AMQ221007: Server is now live |
| 09:53:23,556 INFO [org.apache.activemq.artemis.core.server] AMQ221001: Apache ActiveMQ Artemis Message Broker version 1.6.0 [0.0.0.0, nodeID=04fd5dd8-b18c-11e6-9efe-6a0001921ad0] |
| </code></pre><blockquote> |
| <h2 id="warning">Warning</h2> |
| <p>Make sure you understand your network topology as this is meant to validate |
| your network. Using IPs that could eventually disappear or be partially |
| visible may defeat the purpose. You can use a list of multiple IPs. Any |
| successful ping will make the server OK to continue running</p> |
| </blockquote> |
| |
| |
| </section> |
| |
| </div> |
| <div class="search-results"> |
| <div class="has-results"> |
| |
| <h1 class="search-results-title"><span class='search-results-count'></span> results matching "<span class='search-query'></span>"</h1> |
| <ul class="search-results-list"></ul> |
| |
| </div> |
| <div class="no-results"> |
| |
| <h1 class="search-results-title">No results matching "<span class='search-query'></span>"</h1> |
| |
| </div> |
| </div> |
| </div> |
| |
| </div> |
| </div> |
| |
| </div> |
| |
| |
| |
| <a href="slow-consumers.html" class="navigation navigation-prev " aria-label="Previous page: Detecting Slow Consumers"> |
| <i class="fa fa-angle-left"></i> |
| </a> |
| |
| |
| <a href="critical-analysis.html" class="navigation navigation-next " aria-label="Next page: Detecting Broker Issues (Critical Analysis)"> |
| <i class="fa fa-angle-right"></i> |
| </a> |
| |
| |
| |
| </div> |
| |
| <script> |
| var gitbook = gitbook || []; |
| gitbook.push(function() { |
| gitbook.page.hasChanged({"page":{"title":"Avoiding Network Isolation","level":"1.29","depth":1,"next":{"title":"Detecting Broker Issues (Critical Analysis)","level":"1.30","depth":1,"path":"critical-analysis.md","ref":"critical-analysis.md","articles":[]},"previous":{"title":"Detecting Slow Consumers","level":"1.28","depth":1,"path":"slow-consumers.md","ref":"slow-consumers.md","articles":[]},"dir":"ltr"},"config":{"plugins":[],"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"highlight":{},"search":{},"lunr":{"maxIndexSize":1000000},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"fontsettings":{"theme":"white","family":"sans","size":2},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"github":"apache/activemq-artemis","theme":"default","githubHost":"https://github.com/","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"ActiveMQ Artemis Documentation","links":{"home":"http://activemq.apache.org/artemis","issues":"https://issues.apache.org/jira/browse/ARTEMIS","contribute":"http://activemq.apache.org/contributing.html"},"gitbook":"3.x.x","description":"ActiveMQ Artemis User Guide and Reference Documentation"},"file":{"path":"network-isolation.md","mtime":"2020-03-27T19:42:11.000Z","type":"markdown"},"gitbook":{"version":"3.1.1","time":"2020-04-29T20:47:49.444Z"},"basePath":".","book":{"language":""}}); |
| }); |
| </script> |
| </div> |
| |
| |
| <script src="gitbook/gitbook.js"></script> |
| <script src="gitbook/theme.js"></script> |
| |
| |
| <script src="gitbook/gitbook-plugin-search/search-engine.js"></script> |
| |
| |
| |
| <script src="gitbook/gitbook-plugin-search/search.js"></script> |
| |
| |
| |
| <script src="gitbook/gitbook-plugin-lunr/lunr.min.js"></script> |
| |
| |
| |
| <script src="gitbook/gitbook-plugin-lunr/search-lunr.js"></script> |
| |
| |
| |
| <script src="gitbook/gitbook-plugin-sharing/buttons.js"></script> |
| |
| |
| |
| <script src="gitbook/gitbook-plugin-fontsettings/fontsettings.js"></script> |
| |
| |
| |
| </body> |
| </html> |
| |
