| <!DOCTYPE html> |
| |
| |
| |
| <html lang="en"> |
| <head> |
| <!-- Global site tag (gtag.js) - Google Analytics --> |
| <script async src="https://www.googletagmanager.com/gtag/js?id=UA-61232409-1"></script> |
| <script> |
| window.dataLayer = window.dataLayer || []; |
| function gtag(){dataLayer.push(arguments);} |
| gtag('js', new Date()); |
| |
| gtag('config', 'UA-61232409-1'); |
| </script> |
| |
| |
| |
| <meta charset="UTF-8"> |
| <meta name="ignite-version" content="2.9.0" /> |
| <title>Partition Loss Policy | Ignite Documentation</title> |
| |
| <link rel="canonical" href="/docs/latest/partition-loss-policy" /> |
| |
| |
| <link rel="stylesheet" href="/assets/css/styles.css?1600372553"> |
| <link rel="stylesheet" href="/assets/css/asciidoc-pygments.css"> |
| <link rel="shortcut icon" href="/favicon.ico"> |
| <meta name='viewport' content='width=device-width, height=device-height, initial-scale=1.0, minimum-scale=1.0'> |
| |
| <script type="text/javascript" src="/assets/js/anchor.min.js?1600372553"></script> |
| |
| <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/docsearch.js@2/dist/cdn/docsearch.min.css" /> |
| |
| |
| </head> |
| <body> |
| <header> |
| <div class="container"> |
| <button type='button' class='menu' title='Docs menu'> |
| <img src="/assets/images/menu-icon.svg"/> |
| </button> |
| <div class='home'> |
| <a href="/" class='home' title='Apache Ignite home'> |
| <img src="/assets/images/apache_ignite_logo.svg" alt="Apache Ignite logo" width="103" > |
| </a> |
| </div> |
| |
| <nav> |
| |
| </nav> |
| |
| <select id="version-selector"> |
| <option value="2.9.0">2.9.0</option> |
| </select> |
| |
| <a href="https://github.com/apache/ignite" title='GitHub' class='github' target="_blank"> |
| <img src="/assets/images/github-gray.svg" alt="GitHub logo"> |
| </a> |
| |
| <form class='search'> |
| <button class="search-close" type='button'><img src='/assets/images/cancel.svg'></button> |
| <input type="search" placeholder="Search…" id="search-input"> |
| </form> |
| <button type='button' class='search-toggle'><img src='/assets/images/search.svg'></button> |
| <button type='button' class='top-nav-toggle'>⋮</button> |
| |
| |
| |
| </div> |
| </header> |
| |
| |
| <link rel="stylesheet" href="/assets/css/docs.css"> |
| <section class='page-docs'> |
| |
| |
| |
| |
| <nav class='left-nav' data-swiftype-index='false'> |
| |
| |
| <li> |
| |
| |
| <a href="/docs/latest/preface" class='' >Preface</a> |
| |
| </li> |
| |
| <li> |
| |
| |
| |
| |
| |
| |
| <button type='button' data-guide-url="" class='group-toggle collapsed '>Quick Start Guides<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class='nav-group collapsed'> |
| |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/quick-start/java" |
| |
| class='' |
| >Java</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/quick-start/dotnet" |
| |
| class='' |
| >.NET/C#</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/quick-start/cpp" |
| |
| class='' |
| >C++</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/quick-start/python" |
| |
| class='' |
| >Python</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/quick-start/nodejs" |
| |
| class='' |
| >Node.JS</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/quick-start/sql" |
| |
| class='' |
| >SQL</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/quick-start/php" |
| |
| class='' |
| >PHP</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/quick-start/restapi" |
| |
| class='' |
| >REST API</a> |
| |
| </li> |
| |
| |
| |
| </nav> |
| |
| </li> |
| |
| <li> |
| |
| |
| |
| |
| |
| |
| <button type='button' data-guide-url="/installation" class='group-toggle collapsed '>Installation<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class='nav-group collapsed'> |
| |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/installation/installing-using-zip" |
| |
| class='' |
| >Installing Using ZIP Archive</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/installation/installing-using-docker" |
| |
| class='' |
| >Installing Using Docker</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/installation/deb-rpm" |
| |
| class='' |
| >Installing DEB or RPM package</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| |
| |
| <button |
| type='button' |
| class='collapsed '>Kubernetes<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class="sub_pages collapsed"> |
| |
| |
| |
| |
| <li><a href="/docs/latest//installation/kubernetes/amazon-eks-deployment" class=''>Amazon EKS</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//installation/kubernetes/azure-deployment" class=''>Azure Kubernetes Service</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//installation/kubernetes/gke-deployment" class=''>Google Kubernetes Engine</a></li> |
| |
| </nav> |
| |
| </li> |
| |
| |
| |
| </nav> |
| |
| </li> |
| |
| <li> |
| |
| |
| |
| |
| |
| |
| <button type='button' data-guide-url="" class='group-toggle collapsed '>Setting Up<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class='nav-group collapsed'> |
| |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/setup" |
| |
| class='' |
| >Setting Up Ignite for Java</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/setup-dotnet" |
| |
| class='' |
| >Setting Up Ignite for .NET/C#</a> |
| |
| </li> |
| |
| |
| |
| </nav> |
| |
| </li> |
| |
| <li> |
| |
| |
| <a href="/docs/latest/understanding-configuration" class='' >Understanding Configuration</a> |
| |
| </li> |
| |
| <li> |
| |
| |
| <a href="/docs/latest/logging" class='' >Configuring Logging</a> |
| |
| </li> |
| |
| <li> |
| |
| |
| <a href="/docs/latest/starting-nodes" class='' >Starting and Stopping Nodes</a> |
| |
| </li> |
| |
| <li> |
| |
| |
| |
| |
| |
| |
| <button type='button' data-guide-url="" class='group-toggle collapsed '>Clustering<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class='nav-group collapsed'> |
| |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/clustering/clustering" |
| |
| class='' |
| >Overview</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/clustering/tcp-ip-discovery" |
| |
| class='' |
| >TCP/IP Discovery</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/clustering/zookeeper-discovery" |
| |
| class='' |
| >ZooKeeper Discovery</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/clustering/discovery-in-the-cloud" |
| |
| class='' |
| >Discovery in the Cloud</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/clustering/network-configuration" |
| |
| class='' |
| >Network Configuration</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/clustering/connect-client-nodes" |
| |
| class='' |
| >Connecting Client Nodes</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/clustering/running-client-nodes-behind-nat" |
| |
| class='' |
| >Running Client Nodes Behind NAT</a> |
| |
| </li> |
| |
| |
| |
| </nav> |
| |
| </li> |
| |
| <li> |
| |
| |
| |
| |
| |
| |
| <button type='button' data-guide-url="" class='group-toggle collapsed '>Data Modeling<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class='nav-group collapsed'> |
| |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/data-modeling/data-modeling" |
| |
| class='' |
| >Introduction</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/data-modeling/data-partitioning" |
| |
| class='' |
| >Data Partitioning</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/data-modeling/affinity-collocation" |
| |
| class='' |
| >Affinity Colocation</a> |
| |
| </li> |
| |
| |
| |
| </nav> |
| |
| </li> |
| |
| <li> |
| |
| |
| |
| |
| |
| |
| <button type='button' data-guide-url="" class='group-toggle collapsed '>Configuring Memory<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class='nav-group collapsed'> |
| |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/memory-architecture" |
| |
| class='' |
| >Memory Architecture</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/memory-configuration/data-regions" |
| |
| class='' |
| >Configuring Data Regions</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/memory-configuration/eviction-policies" |
| |
| class='' |
| >Eviction Policies</a> |
| |
| </li> |
| |
| |
| |
| </nav> |
| |
| </li> |
| |
| <li> |
| |
| |
| |
| |
| |
| |
| <button type='button' data-guide-url="" class='group-toggle collapsed '>Configuring Caches<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class='nav-group collapsed'> |
| |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/configuring-caches/configuration-overview" |
| |
| class='' |
| >Cache Configuration</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/configuring-caches/configuring-backups" |
| |
| class='' |
| >Configuring Partition Backups</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/configuring-caches/atomicity-modes" |
| |
| class='' |
| >Atomicity Modes</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/configuring-caches/expiry-policies" |
| |
| class='' |
| >Expiry Policy</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/configuring-caches/on-heap-caching" |
| |
| class='' |
| >On-Heap Caching</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/configuring-caches/cache-groups" |
| |
| class='' |
| >Cache Groups</a> |
| |
| </li> |
| |
| |
| |
| </nav> |
| |
| </li> |
| |
| <li> |
| |
| |
| |
| |
| |
| |
| <button type='button' data-guide-url="" class='group-toggle collapsed '>Persistence<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class='nav-group collapsed'> |
| |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/persistence/native-persistence" |
| |
| class='' |
| >Ignite Persistence</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/persistence/external-storage" |
| |
| class='' |
| >External Storage</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/persistence/swap" |
| |
| class='' |
| >Swapping</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/persistence/custom-cache-store" |
| |
| class='' |
| >Implementing Custom Cache Store</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/persistence/snapshots" |
| |
| class='' |
| >Cluster Snapshots</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/persistence/disk-compression" |
| |
| class='' |
| >Disk Compression</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/persistence/persistence-tuning" |
| |
| class='' |
| >Tuning Persistence</a> |
| |
| </li> |
| |
| |
| |
| </nav> |
| |
| </li> |
| |
| <li> |
| |
| |
| <a href="/docs/latest/baseline-topology" class='' >Baseline Topology</a> |
| |
| </li> |
| |
| <li> |
| |
| |
| <a href="/docs/latest/cluster-states" class='' >Cluster States</a> |
| |
| </li> |
| |
| <li> |
| |
| |
| <a href="/docs/latest/data-rebalancing" class='' >Data Rebalancing</a> |
| |
| </li> |
| |
| <li> |
| |
| |
| <a href="/docs/latest/partition-loss-policy" class='' >Partition Loss Policy</a> |
| |
| </li> |
| |
| <li> |
| |
| |
| <a href="/docs/latest/deploying-user-code" class='' >Deploying User Code</a> |
| |
| </li> |
| |
| <li> |
| |
| |
| <a href="/docs/latest/peer-class-loading" class='' >Peer Class Loading</a> |
| |
| </li> |
| |
| <li> |
| |
| |
| <a href="/docs/latest/data-streaming" class='' >Data Streaming</a> |
| |
| </li> |
| |
| <li> |
| |
| |
| |
| |
| |
| |
| <button type='button' data-guide-url="" class='group-toggle collapsed '>Using Key-Value Cache API<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class='nav-group collapsed'> |
| |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/key-value-api/basic-cache-operations" |
| |
| class='' |
| >Basic Cache Operations</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/key-value-api/binary-objects" |
| |
| class='' |
| >Working with Binary Objects</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/key-value-api/using-scan-queries" |
| |
| class='' |
| >Using Scan Queries</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/read-repair" |
| |
| class='' |
| >Read Repair</a> |
| |
| </li> |
| |
| |
| |
| </nav> |
| |
| </li> |
| |
| <li> |
| |
| |
| <a href="/docs/latest/key-value-api/continuous-queries" class='' >Using Continuous Queries</a> |
| |
| </li> |
| |
| <li> |
| |
| |
| <a href="/docs/latest/key-value-api/transactions" class='' >Performing Transactions</a> |
| |
| </li> |
| |
| <li> |
| |
| |
| |
| |
| |
| |
| <button type='button' data-guide-url="" class='group-toggle collapsed '>Working with SQL<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class='nav-group collapsed'> |
| |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/SQL/sql-introduction" |
| |
| class='' |
| >Introduction</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/SQL/schemas" |
| |
| class='' |
| >Understanding Schemas</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/SQL/indexes" |
| |
| class='' |
| >Defining Indexes</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/SQL/sql-api" |
| |
| class='' |
| >Using SQL API</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/SQL/distributed-joins" |
| |
| class='' |
| >Distributed Joins</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/SQL/sql-transactions" |
| |
| class='' |
| >SQL Transactions</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/SQL/custom-sql-func" |
| |
| class='' |
| >Custom SQL Functions</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/SQL/JDBC/jdbc-driver" |
| |
| class='' |
| >JDBC Driver</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/SQL/JDBC/jdbc-client-driver" |
| |
| class='' |
| >JDBC Client Driver</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/transactions/mvcc" |
| |
| class='' |
| >Multiversion Concurrency Control</a> |
| |
| </li> |
| |
| |
| |
| </nav> |
| |
| </li> |
| |
| <li> |
| |
| |
| |
| |
| |
| |
| <button type='button' data-guide-url="" class='group-toggle collapsed '>Distributed Computing<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class='nav-group collapsed'> |
| |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/distributed-computing/distributed-computing" |
| |
| class='' |
| >Distributed Computing API</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/distributed-computing/cluster-groups" |
| |
| class='' |
| >Cluster Groups</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/distributed-computing/executor-service" |
| |
| class='' |
| >Executor Service</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/distributed-computing/map-reduce" |
| |
| class='' |
| >MapReduce API</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/distributed-computing/load-balancing" |
| |
| class='' |
| >Load Balancing</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/distributed-computing/fault-tolerance" |
| |
| class='' |
| >Fault Tolerance</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/distributed-computing/job-scheduling" |
| |
| class='' |
| >Job Scheduling</a> |
| |
| </li> |
| |
| |
| |
| </nav> |
| |
| </li> |
| |
| <li> |
| |
| |
| <a href="/docs/latest/collocated-computations" class='' >Colocating Computations with Data</a> |
| |
| </li> |
| |
| <li> |
| |
| |
| |
| |
| |
| |
| <button type='button' data-guide-url="" class='group-toggle collapsed '>Working with Events<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class='nav-group collapsed'> |
| |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/events/listening-to-events" |
| |
| class='' |
| >Enabling and Listenting to Events</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/events/events" |
| |
| class='' |
| >Events</a> |
| |
| </li> |
| |
| |
| |
| </nav> |
| |
| </li> |
| |
| <li> |
| |
| |
| <a href="/docs/latest/near-cache" class='' >Near Caches</a> |
| |
| </li> |
| |
| <li> |
| |
| |
| <a href="/docs/latest/platform-cache" class='' >.NET Platform Cache</a> |
| |
| </li> |
| |
| <li> |
| |
| |
| <a href="/docs/latest/services/services" class='' >Services</a> |
| |
| </li> |
| |
| <li> |
| |
| |
| |
| |
| |
| |
| <button type='button' data-guide-url="" class='group-toggle collapsed '>Distributed Data Structures<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class='nav-group collapsed'> |
| |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/data-structures/queue-and-set" |
| |
| class='' |
| >Queue and Set</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/data-structures/atomic-types" |
| |
| class='' |
| >Atomic Types</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/data-structures/countdownlatch" |
| |
| class='' |
| >CountDownLatch</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/data-structures/atomic-sequence" |
| |
| class='' |
| >Atomic Sequence</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/data-structures/semaphore" |
| |
| class='' |
| >Semaphore</a> |
| |
| </li> |
| |
| |
| |
| </nav> |
| |
| </li> |
| |
| <li> |
| |
| |
| |
| |
| |
| |
| <button type='button' data-guide-url="" class='group-toggle collapsed '>Machine Learning<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class='nav-group collapsed'> |
| |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/machine-learning/machine-learning" |
| |
| class='' |
| >Machine Learning</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/machine-learning/partition-based-dataset" |
| |
| class='' |
| >Partition Based Dataset</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/machine-learning/updating-trained-models" |
| |
| class='' |
| >Updating Trained Models</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| |
| |
| <button |
| type='button' |
| class='collapsed '>Binary Classification<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class="sub_pages collapsed"> |
| |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/binary-classification/introduction" class=''>Introduction</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/binary-classification/linear-svm" class=''>Linear SVM (Support Vector Machine)</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/binary-classification/decision-trees" class=''>Decision Trees</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/binary-classification/multilayer-perceptron" class=''>Multilayer Perceptron</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/binary-classification/logistic-regression" class=''>Logistic Regression</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/binary-classification/knn-classification" class=''>k-NN Classification</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/binary-classification/ann" class=''>ANN (Approximate Nearest Neighbor)</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/binary-classification/naive-bayes" class=''>Naive Bayes</a></li> |
| |
| </nav> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| |
| |
| <button |
| type='button' |
| class='collapsed '>Regression<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class="sub_pages collapsed"> |
| |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/regression/introduction" class=''>Introduction</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/regression/linear-regression" class=''>Linear Regression</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/regression/decision-trees-regression" class=''>Decision Trees Regression</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/regression/knn-regression" class=''>k-NN Regression</a></li> |
| |
| </nav> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| |
| |
| <button |
| type='button' |
| class='collapsed '>Clustering<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class="sub_pages collapsed"> |
| |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/clustering/introduction" class=''>Introduction</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/clustering/k-means-clustering" class=''>K-Means Clustering</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/clustering/gaussian-mixture" class=''>Gaussian mixture (GMM)</a></li> |
| |
| </nav> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/machine-learning/preprocessing" |
| |
| class='' |
| >Preprocessing</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| |
| |
| <button |
| type='button' |
| class='collapsed '>Model Selection<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class="sub_pages collapsed"> |
| |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/model-selection/introduction" class=''>Introduction</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/model-selection/evaluator" class=''>Evaluator</a></li> |
| |
| |
| |
| <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> |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/model-selection/hyper-parameter-tuning" class=''>Hyper-parameter tuning</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/model-selection/pipeline-api" class=''>Pipeline API</a></li> |
| |
| </nav> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/machine-learning/multiclass-classification" |
| |
| class='' |
| >Multiclass Classification</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| |
| |
| <button |
| type='button' |
| class='collapsed '>Ensemble Methods<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class="sub_pages collapsed"> |
| |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/ensemble-methods/introduction" class=''></a></li> |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/ensemble-methods/stacking" class=''>Stacking</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/ensemble-methods/baggin" class=''>Bagging</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/ensemble-methods/random-forest" class=''>Random Forest</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/ensemble-methods/gradient-boosting" class=''>Gradient Boosting</a></li> |
| |
| </nav> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/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"></button> |
| <nav class="sub_pages collapsed"> |
| |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/importing-model/introduction" class=''>Introduction</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/importing-model/model-import-from-gxboost" class=''>Import Model from XGBoost</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//machine-learning/importing-model/model-import-from-apache-spark" class=''>Import Model from Apache Spark</a></li> |
| |
| </nav> |
| |
| </li> |
| |
| |
| |
| </nav> |
| |
| </li> |
| |
| <li> |
| |
| |
| |
| |
| |
| |
| <button type='button' data-guide-url="" class='group-toggle collapsed '>Monitoring<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class='nav-group collapsed'> |
| |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/monitoring-metrics/intro" |
| |
| class='' |
| >Introduction</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/monitoring-metrics/cluster-id" |
| |
| class='' |
| >Cluster ID and Tag</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| |
| |
| <button |
| type='button' |
| class='collapsed '>Metrics<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class="sub_pages collapsed"> |
| |
| |
| |
| |
| <li><a href="/docs/latest//monitoring-metrics/configuring-metrics" class=''>Configuring Metrics</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//monitoring-metrics/metrics" class=''>JMX Metrics</a></li> |
| |
| </nav> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| |
| |
| <button |
| type='button' |
| class='collapsed '>New Metrics System<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class="sub_pages collapsed"> |
| |
| |
| |
| |
| <li><a href="/docs/latest//monitoring-metrics/new-metrics-system" class=''>Introduction</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//monitoring-metrics/new-metrics" class=''>Metrics</a></li> |
| |
| </nav> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/monitoring-metrics/system-views" |
| |
| class='' |
| >System Views</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/monitoring-metrics/tracing" |
| |
| class='' |
| >Tracing</a> |
| |
| </li> |
| |
| |
| |
| </nav> |
| |
| </li> |
| |
| <li> |
| |
| |
| |
| |
| |
| |
| <button type='button' data-guide-url="/security" class='group-toggle collapsed '>Security<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class='nav-group collapsed'> |
| |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/security/authentication" |
| |
| class='' |
| >Authentication</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/security/ssl-tls" |
| |
| class='' |
| >SSL/TLS</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| |
| |
| <button |
| type='button' |
| class='collapsed '>Transparent Data Encryption<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class="sub_pages collapsed"> |
| |
| |
| |
| |
| <li><a href="/docs/latest//security/tde" class=''>Introduction</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//security/master-key-rotation" class=''>Master key rotation</a></li> |
| |
| </nav> |
| |
| </li> |
| |
| |
| |
| </nav> |
| |
| </li> |
| |
| <li> |
| |
| |
| |
| |
| |
| |
| <button type='button' data-guide-url="" class='group-toggle collapsed '>Thin Clients<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class='nav-group collapsed'> |
| |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/thin-clients/getting-started-with-thin-clients" |
| |
| class='' |
| >Thin Clients Overview</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/thin-clients/java-thin-client" |
| |
| class='' |
| >Java Thin Client</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/thin-clients/dotnet-thin-client" |
| |
| class='' |
| >.NET Thin Client</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/thin-clients/cpp-thin-client" |
| |
| class='' |
| >C++ Thin Client</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/thin-clients/python-thin-client" |
| |
| class='' |
| >Python Thin Client</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/thin-clients/php-thin-client" |
| |
| class='' |
| >PHP Thin Client</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/thin-clients/nodejs-thin-client" |
| |
| class='' |
| >Node.js Thin Client</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| |
| |
| <button |
| type='button' |
| class='collapsed '>Binary Client Protocol<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class="sub_pages collapsed"> |
| |
| |
| |
| |
| <li><a href="/docs/latest//binary-client-protocol/binary-client-protocol" class=''>Binary Client Protocol</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//binary-client-protocol/data-format" class=''>Data Format</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//binary-client-protocol/key-value-queries" class=''>Key-Value Queries</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//binary-client-protocol/sql-and-scan-queries" class=''>SQL and Scan Queries</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//binary-client-protocol/binary-type-metadata" class=''>Binary Types Metadata</a></li> |
| |
| |
| |
| <li><a href="/docs/latest//binary-client-protocol/cache-configuration" class=''>Cache Configuration</a></li> |
| |
| </nav> |
| |
| </li> |
| |
| |
| |
| </nav> |
| |
| </li> |
| |
| <li> |
| |
| |
| |
| |
| |
| |
| <button type='button' data-guide-url="" class='group-toggle collapsed '>ODBC Driver<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class='nav-group collapsed'> |
| |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/SQL/ODBC/odbc-driver" |
| |
| class='' |
| >ODBC Driver</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/SQL/ODBC/connection-string-dsn" |
| |
| class='' |
| >Connection String and DSN</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/SQL/ODBC/querying-modifying-data" |
| |
| class='' |
| >Querying and Modifying Data</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/SQL/ODBC/specification" |
| |
| class='' |
| >Specification</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/SQL/ODBC/data-types" |
| |
| class='' |
| >Data Types</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/SQL/ODBC/error-codes" |
| |
| class='' |
| >Error Codes</a> |
| |
| </li> |
| |
| |
| |
| </nav> |
| |
| </li> |
| |
| <li> |
| |
| |
| <a href="/docs/latest/restapi" class='' >REST API</a> |
| |
| </li> |
| |
| <li> |
| |
| |
| <a href="/docs/latest/control-script" class='' >Control Script</a> |
| |
| </li> |
| |
| <li> |
| |
| |
| <a href="/docs/latest/plugins" class='' >Plugins</a> |
| |
| </li> |
| |
| <li> |
| |
| |
| <a href="/docs/latest/sqlline" class='' >SQLLine</a> |
| |
| </li> |
| |
| <li> |
| |
| |
| |
| |
| |
| |
| <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> |
| <nav class='nav-group collapsed'> |
| |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/ignite-for-spark/overview" |
| |
| class='' |
| >Overview</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/ignite-for-spark/ignitecontext-and-rdd" |
| |
| class='' |
| >IgniteContext and IgniteRDD</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/ignite-for-spark/ignite-dataframe" |
| |
| class='' |
| >Ignite DataFrame</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/ignite-for-spark/installation" |
| |
| class='' |
| >Installation</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/ignite-for-spark/spark-shell" |
| |
| class='' |
| >Test Ignite with Spark-shell</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/ignite-for-spark/troubleshooting" |
| |
| class='' |
| >Troubleshooting</a> |
| |
| </li> |
| |
| |
| |
| </nav> |
| |
| </li> |
| |
| <li> |
| |
| |
| |
| |
| |
| |
| <button type='button' data-guide-url="/sql-reference/sql-reference-overview" class='group-toggle collapsed '>SQL Reference<img class="state-indicator" src="/assets/images/left-nav-arrow.svg"></button> |
| <nav class='nav-group collapsed'> |
| |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/sql-reference/sql-conformance" |
| |
| class='' |
| >SQL Conformance</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/sql-reference/ddl" |
| |
| class='' |
| >Data Definition Language (DDL)</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/sql-reference/dml" |
| |
| class='' |
| >Data Manipulation Language (DML)</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/sql-reference/transactions" |
| |
| class='' |
| >Transactions</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/sql-reference/operational-commands" |
| |
| class='' |
| >Operational Commands</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/sql-reference/aggregate-functions" |
| |
| class='' |
| >Aggregate functions</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/sql-reference/numeric-functions" |
| |
| class='' |
| >Numeric Functions</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/sql-reference/string-functions" |
| |
| class='' |
| >String Functions</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/sql-reference/date-time-functions" |
| |
| class='' |
| >Data and Time Functions</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/sql-reference/system-functions" |
| |
| class='' |
| >System Functions</a> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li> |
| |
| <a href="/docs/latest/sql-reference/data-types" |
| |
| class='' |
| >Data Types</a> |
| |
| </li> |
| |
| |
| |
| </nav> |
| |
| </li> |
| |
| </nav> |
| <div class="left-nav__overlay"></div> |
| |
| |
| <article data-swiftype-index='true'> |
| <a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/partition-loss-policy.adoc" target="_blank">Edit</a> |
| |
| <h1>Partition Loss Policy</h1> |
| |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Throughout the cluster’s lifecycle, it may happen that some data partitions are lost due to the failure of the primary and backup nodes for the partitions. |
| Such a situation leads to a partial data loss and needs to be addressed according to your use case.</p> |
| </div> |
| <div class="paragraph"> |
| <p>A partition is lost when both the primary copy and all backup copies of the partition are not available to the cluster, i.e. when the primary and backup nodes for the partition become unavailable. It means that for a given cache, you cannot afford to lose more than <code>number_of_backups</code> nodes. |
| You can set the number of backup partitions for a cache in the <a href="/docs/latest/configuring-caches/configuring-backups">cache configuration</a>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>When the cluster topology changes, Ignite checks if the change resulted in a partition loss, and, depending on the configured partition loss policy and baseline autoadjustment settings, allows or prohibits operations on caches. |
| See the description of each policy in the next section.</p> |
| </div> |
| <div class="paragraph"> |
| <p>For pure in-memory caches, when a partition is lost, the data from the partition cannot be recovered unless you load it into the cluster again. |
| For persistent caches, the data is not physically lost, because it has been persisted to disk. |
| When the nodes that failed or disconnected return to the cluster (after a restart), the data is loaded from the disk. |
| In this case, you need to reset the state of the lost partitions in order to continue to use the data. See <a href="#handling-partition-loss">Handling Partition Loss</a>.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="configuring-partition-loss-policy">Configuring Partition Loss Policy</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Ignite supports the following partition loss policies:</p> |
| </div> |
| <table class="tableblock frame-all grid-all stripes-none stretch"> |
| <colgroup> |
| <col style="width: 16.6666%;"> |
| <col style="width: 83.3334%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Policy</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>IGNORE</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Partition loss is ignored. The cluster treats lost partitions as if they are empty. When you request data from such partitions, the cluster returns empty values as if the data was never there.</p> |
| <p class="tableblock">This policy can only be used in pure in-memory clusters where baseline autoadjustment is enabled with a 0 timeout, and is the default value for such configurations. |
| In all other configurations (the clusters where there is at least one data region with persistence), the <code>IGNORE</code> policy is replaced with <code>READ_WRITE_SAFE</code> even if you explicitly set <code>IGNORE</code> in the cache configuration.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>READ_WRITE_SAFE</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Any attempt to read from or write to a lost partition of the cache results in an exception. However, you can read/write to the available partitions.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>READ_ONLY_SAFE</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">The cache is available in read-only mode. Write operations to the cache result in an exception. Read operations from the lost partitions result in an exception as well. See the <a href="#handling-partition-loss">Handling Partition Loss</a> section below.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="paragraph"> |
| <p>Partition loss policy is configured per cache.</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="nt"><bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.IgniteConfiguration"</span><span class="nt">></span> |
| |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"cacheConfiguration"</span><span class="nt">></span> |
| <span class="nt"><bean</span> <span class="na">class=</span><span class="s">"org.apache.ignite.configuration.CacheConfiguration"</span><span class="nt">></span> |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"name"</span> <span class="na">value=</span><span class="s">"myCache"</span><span class="nt">/></span> |
| |
| <span class="nt"><property</span> <span class="na">name=</span><span class="s">"partitionLossPolicy"</span> <span class="na">value=</span><span class="s">"READ_ONLY_SAFE"</span><span class="nt">/></span> |
| <span class="nt"></bean></span> |
| <span class="nt"></property></span> |
| <span class="c"><!-- other properties --></span> |
| |
| <span class="nt"></bean></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">CacheConfiguration</span> <span class="n">cacheCfg</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">CacheConfiguration</span><span class="o">(</span><span class="s">"myCache"</span><span class="o">);</span> |
| |
| <span class="n">cacheCfg</span><span class="o">.</span><span class="na">setPartitionLossPolicy</span><span class="o">(</span><span class="nc">PartitionLossPolicy</span><span class="o">.</span><span class="na">READ_ONLY_SAFE</span><span class="o">);</span></code></pre> |
| </div> |
| </div></code-tab><code-tab data-tab='C#/.NET'></code-tab><code-tab data-tab='C++'></code-tab></code-tabs> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="listening-to-partition-loss-events">Listening to Partition Loss Events</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>You can listen to the <code>EVT_CACHE_REBALANCE_PART_DATA_LOST</code> event to be notified when a partition loss occurs. |
| This event is fired for every partition that is lost and contains the number of the lost partition and ID of the node that held the partition. |
| Partition loss events are triggered only when either <code>READ_WRITE_SAFE</code> or <code>READ_ONLY_SAFE</code> policy is used.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Enable the event in the cluster configuration first. |
| See <a href="/docs/latest/events/listening-to-events#enabling-events">Enabling Events</a>.</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="nc">IgnitePredicate</span><span class="o"><</span><span class="nc">Event</span><span class="o">></span> <span class="n">locLsnr</span> <span class="o">=</span> <span class="n">evt</span> <span class="o">-></span> <span class="o">{</span> |
| <span class="nc">CacheRebalancingEvent</span> <span class="n">cacheEvt</span> <span class="o">=</span> <span class="o">(</span><span class="nc">CacheRebalancingEvent</span><span class="o">)</span> <span class="n">evt</span><span class="o">;</span> |
| |
| <span class="kt">int</span> <span class="n">lostPart</span> <span class="o">=</span> <span class="n">cacheEvt</span><span class="o">.</span><span class="na">partition</span><span class="o">();</span> |
| |
| <span class="nc">ClusterNode</span> <span class="n">node</span> <span class="o">=</span> <span class="n">cacheEvt</span><span class="o">.</span><span class="na">discoveryNode</span><span class="o">();</span> |
| |
| <span class="nc">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="n">lostPart</span><span class="o">);</span> |
| |
| <span class="k">return</span> <span class="kc">true</span><span class="o">;</span> <span class="c1">// Continue listening.</span> |
| <span class="o">};</span> |
| |
| <span class="n">ignite</span><span class="o">.</span><span class="na">events</span><span class="o">().</span><span class="na">localListen</span><span class="o">(</span><span class="n">locLsnr</span><span class="o">,</span> <span class="nc">EventType</span><span class="o">.</span><span class="na">EVT_CACHE_REBALANCE_PART_DATA_LOST</span><span class="o">);</span></code></pre> |
| </div> |
| </div></code-tab><code-tab data-tab='C#/.NET'></code-tab><code-tab data-tab='C++'></code-tab></code-tabs> |
| <div class="paragraph"> |
| <p>See <a href="/docs/latest/events/events#cache-rebalancing-events">Cache Rebalancing Events</a> for the information about other events related to rebalancing of partitions.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="handling-partition-loss">Handling Partition Loss</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>If data is not physically lost, you can return the nodes that left the cluster and reset the state of the lost partitions so that you can continue to work with the data. |
| You can reset the state of lost partition by calling <code>Ignite.resetLostPartitions(cacheNames)</code> for specific caches or via the control script.</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">resetLostPartitions</span><span class="o">(</span><span class="nc">Arrays</span><span class="o">.</span><span class="na">asList</span><span class="o">(</span><span class="s">"myCache"</span><span class="o">));</span></code></pre> |
| </div> |
| </div></code-tab><code-tab data-tab='C#/.NET'></code-tab><code-tab data-tab='C++'></code-tab></code-tabs> |
| <div class="paragraph"> |
| <p>The control script command:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="rouge highlight"><code data-lang="shell">control.sh <span class="nt">--cache</span> reset_lost_partitions myCache</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>If you don’t reset lost partitions, read and write operations (depending on the policy configured for the cache) from the lost partitions will throw a <code>CacheException</code>. |
| You can check if the exception is due to the state of the partitions by analyzing its root cause, like so:</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">IgniteCache</span><span class="o"><</span><span class="nc">Integer</span><span class="o">,</span> <span class="nc">Integer</span><span class="o">></span> <span class="n">cache</span> <span class="o">=</span> <span class="n">ignite</span><span class="o">.</span><span class="na">cache</span><span class="o">(</span><span class="s">"myCache"</span><span class="o">);</span> |
| |
| <span class="k">try</span> <span class="o">{</span> |
| <span class="nc">Integer</span> <span class="n">value</span> <span class="o">=</span> <span class="n">cache</span><span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="mi">3</span><span class="o">);</span> |
| <span class="nc">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="n">value</span><span class="o">);</span> |
| <span class="o">}</span> <span class="k">catch</span> <span class="o">(</span><span class="nc">CacheException</span> <span class="n">e</span><span class="o">)</span> <span class="o">{</span> |
| <span class="k">if</span> <span class="o">(</span><span class="n">e</span><span class="o">.</span><span class="na">getCause</span><span class="o">()</span> <span class="k">instanceof</span> <span class="nc">CacheInvalidStateException</span><span class="o">)</span> <span class="o">{</span> |
| <span class="nc">System</span><span class="o">.</span><span class="na">out</span><span class="o">.</span><span class="na">println</span><span class="o">(</span><span class="n">e</span><span class="o">.</span><span class="na">getCause</span><span class="o">().</span><span class="na">getMessage</span><span class="o">());</span> |
| <span class="o">}</span> <span class="k">else</span> <span class="o">{</span> |
| <span class="n">e</span><span class="o">.</span><span class="na">printStackTrace</span><span class="o">();</span> |
| <span class="o">}</span> |
| <span class="o">}</span></code></pre> |
| </div> |
| </div></code-tab><code-tab data-tab='C#/.NET'></code-tab><code-tab data-tab='C++'></code-tab></code-tabs> |
| <div class="paragraph"> |
| <p>You can get the list of lost partitions for a cache via <code>IgniteCache.lostPartitions()</code>.</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">IgniteCache</span><span class="o"><</span><span class="nc">Integer</span><span class="o">,</span> <span class="nc">String</span><span class="o">></span> <span class="n">cache</span> <span class="o">=</span> <span class="n">ignite</span><span class="o">.</span><span class="na">cache</span><span class="o">(</span><span class="s">"myCache"</span><span class="o">);</span> |
| |
| <span class="n">cache</span><span class="o">.</span><span class="na">lostPartitions</span><span class="o">();</span></code></pre> |
| </div> |
| </div></code-tab><code-tab data-tab='C#/.NET'></code-tab><code-tab data-tab='C++'></code-tab></code-tabs> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="recovering-from-a-partition-loss">Recovering From a Partition Loss</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The following sections explain how you can recover from a partition loss in different cluster configurations.</p> |
| </div> |
| <div class="sect2"> |
| <h3 id="pure-in-memory-cluster-with-ignore-policy">Pure In-memory Cluster with IGNORE policy</h3> |
| <div class="paragraph"> |
| <p>In this configuration, the <code>IGNORE</code> policy is only applicable when baseline autoadjustment is enabled with a 0 timeout, which is the default setting for in-memory clusters. |
| For such configurations, partition loss is ignored. |
| The cache continues to be operational with the lost partitions treated as empty.</p> |
| </div> |
| <div class="paragraph"> |
| <p>When baseline autoadjustment is disabled or when the timeout is greater than 0, the <code>IGNORE</code> policy is replaced with <code>READ_WRITE_SAFE</code>.</p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="pure-in-memory-cluster-with-read_write_safe-or-read_only_safe-policy">Pure In-memory Cluster with READ_WRITE_SAFE or READ_ONLY_SAFE policy</h3> |
| <div class="paragraph"> |
| <p>User operations are blocked until you reset the lost partitions. |
| After the reset, continue using the cache but the data will be lost.</p> |
| </div> |
| <div class="paragraph"> |
| <p>When baseline autoadjustment is disabled or when the timeout is greater than 0, you must return the nodes (at least one partition owner for each partition) to the baseline topology before resetting the lost partitions. |
| Otherwise, <code>Ignite.resetLostPartitions(cacheNames)</code> throws a <code>ClusterTopologyCheckedException</code> with a message <code>Cannot reset lost partitions because no baseline nodes are online [cache=someCahe, partition=someLostPart]</code> indicating that safe recovery is not possible. |
| If you cannot return the nodes for some reason (e.g. hardware failure), exclude them from the baseline topology manually before attempting to reset the lost partitions.</p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="clusters-with-persistence">Clusters with Persistence</h3> |
| <div class="paragraph"> |
| <p>In clusters where all data regions are configured to persist data on disk (there is no in-memory regions), there are two ways to recover from a partition loss (provided the data is not damaged physically):</p> |
| </div> |
| <div class="olist arabic"> |
| <ol class="arabic"> |
| <li> |
| <p>Return <em>all</em> nodes to the baseline topology,</p> |
| </li> |
| <li> |
| <p>Reset lost partitions (call <code>Ignite.resetLostPartitions(…​)</code> for all caches).</p> |
| </li> |
| </ol> |
| </div> |
| <div class="paragraph"> |
| <p>or</p> |
| </div> |
| <div class="olist arabic"> |
| <ol class="arabic"> |
| <li> |
| <p>Stop all nodes,</p> |
| </li> |
| <li> |
| <p>Start all nodes including those that failed and activate the cluster.</p> |
| </li> |
| </ol> |
| </div> |
| <div class="paragraph"> |
| <p>If some nodes cannot be returned, exclude them from the baseline topology before attempting to reset the state of lost partitions.</p> |
| </div> |
| </div> |
| <div class="sect2"> |
| <h3 id="clusters-with-both-in-memory-and-persistent-caches">Clusters with Both In-memory and Persistent Caches</h3> |
| <div class="paragraph"> |
| <p>In clusters where there are both in-memory regions and persistent regions, in-memory caches are treated the same way as in pure in-memory clusters with partition loss policy set to <code>READ_WRITE_SAFE</code>, and persistent caches are treated the same way as in persistent clusters.</p> |
| </div> |
| </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="#configuring-partition-loss-policy">Configuring Partition Loss Policy</a></li> |
| <li><a href="#listening-to-partition-loss-events">Listening to Partition Loss Events</a></li> |
| <li><a href="#handling-partition-loss">Handling Partition Loss</a></li> |
| <li><a href="#recovering-from-a-partition-loss">Recovering From a Partition Loss</a> |
| <ul class="sectlevel2"> |
| <li><a href="#pure-in-memory-cluster-with-ignore-policy">Pure In-memory Cluster with IGNORE policy</a></li> |
| <li><a href="#pure-in-memory-cluster-with-read_write_safe-or-read_only_safe-policy">Pure In-memory Cluster with READ_WRITE_SAFE or READ_ONLY_SAFE policy</a></li> |
| <li><a href="#clusters-with-persistence">Clusters with Persistence</a></li> |
| <li><a href="#clusters-with-both-in-memory-and-persistent-caches">Clusters with Both In-memory and Persistent Caches</a></li> |
| </ul> |
| </li> |
| </ul> |
| |
| |
| <footer> |
| </footer> |
| |
| </nav> |
| |
| </section> |
| <script type='module' src='/assets/js/code-copy-to-clipboard.js' async crossorigin></script> |
| |
| <script> |
| // inits deep anchors -- needs to be done here because of https://www.bryanbraun.com/anchorjs/#dont-run-it-too-late |
| anchors.add('.page-docs h1, .page-docs h2, .page-docs h3:not(.discrete), .page-docs h4, .page-docs h5'); |
| anchors.options = { |
| placement: 'right', |
| visible: 'always' |
| }; |
| </script> |
| <!-- load google fonts async --> |
| <script type="text/javascript"> |
| WebFontConfig = { |
| google: { families: [ 'Open+Sans:300,400,600,700&display=swap' ] } |
| }; |
| (function() { |
| var wf = document.createElement('script'); |
| wf.src = 'https://ajax.googleapis.com/ajax/libs/webfont/1/webfont.js'; |
| wf.type = 'text/javascript'; |
| wf.async = 'true'; |
| var s = document.getElementsByTagName('script')[0]; |
| s.parentNode.insertBefore(wf, s); |
| })(); </script> |
| <script src="https://cdn.jsdelivr.net/npm/docsearch.js@2/dist/cdn/docsearch.min.js"></script> |
| <script> |
| docsearch({ |
| // Your apiKey and indexName will be given to you once |
| // we create your config |
| apiKey: '3eee686c0ebe39eff3baeb18c56fa5f8', |
| indexName: 'apache_ignite', |
| // Replace inputSelector with a CSS selector |
| // matching your search input |
| inputSelector: '#search-input', |
| // algoliaOptions: { 'facetFilters': ["version:$VERSION"] }, |
| |
| // Set debug to true to inspect the dropdown |
| debug: false, |
| }); |
| </script> |
| <script type='module' src='/assets/js/index.js?1600372553' async crossorigin></script> |
| <script type='module' src='/assets/js/versioning.js?1600372553' async crossorigin></script> |
| </body> |
| |
| </html> |
