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| <a class="page-scroll navbar-brand" href=https://iceberg.apache.org/><img class=top-navbar-logo src=https://iceberg.apache.org/docs/fd-update-slack-url//img/iceberg-logo-icon.png> Apache Iceberg</a></div><div><input type=search class=form-control id=search-input placeholder=Search... maxlength=64 data-hotkeys=s/></div><div class=versions-dropdown><span>1.4.2</span> <i class="fa fa-chevron-down"></i><div class=versions-dropdown-content><ul><li class=versions-dropdown-selection><a href=https://iceberg.apache.org/docs/fd-update-slack-url/../latest>latest</a></li><li class=versions-dropdown-selection><a href=https://iceberg.apache.org/docs/fd-update-slack-url/../1.4.2>1.4.2</a></li><li class=versions-dropdown-selection><a href=https://iceberg.apache.org/docs/fd-update-slack-url/../1.4.1>1.4.1</a></li><li class=versions-dropdown-selection><a href=https://iceberg.apache.org/docs/fd-update-slack-url/../1.4.0>1.4.0</a></li><li class=versions-dropdown-selection><a 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| <i class="fa fa-chevron-down"></i></a></li><div id=Tables class=collapse><ul class=sub-menu><li><a href=./branching/>Branching and Tagging</a></li><li><a href=./configuration/>Configuration</a></li><li><a href=./evolution/>Evolution</a></li><li><a href=./maintenance/>Maintenance</a></li><li><a href=./metrics-reporting/>Metrics Reporting</a></li><li><a href=./partitioning/>Partitioning</a></li><li><a href=./performance/>Performance</a></li><li><a href=./reliability/>Reliability</a></li><li><a href=./schemas/>Schemas</a></li></ul></div><li><a class="chevron-toggle collapsed" data-toggle=collapse data-parent=full href=#Spark><span>Spark</span> |
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| <i class="fa fa-chevron-down"></i></a></li><div id=Spark class=collapse><ul class=sub-menu><li><a href=./getting-started/>Getting Started</a></li><li><a href=./spark-configuration/>Configuration</a></li><li><a href=./spark-ddl/>DDL</a></li><li><a href=./spark-procedures/>Procedures</a></li><li><a href=./spark-queries/>Queries</a></li><li><a href=./spark-structured-streaming/>Structured Streaming</a></li><li><a href=./spark-writes/>Writes</a></li></ul></div><li><a class="chevron-toggle collapsed" data-toggle=collapse data-parent=full href=#Flink><span>Flink</span> |
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| <i class="fa fa-chevron-down"></i></a></li><div id=Integrations class=collapse><ul class=sub-menu><li><a href=./aws/>AWS</a></li><li><a href=./dell/>Dell</a></li><li><a href=./jdbc/>JDBC</a></li><li><a href=./nessie/>Nessie</a></li></ul></div><li><a class="chevron-toggle collapsed" data-toggle=collapse data-parent=full href=#API><span>API</span> |
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| <i class="fa fa-chevron-down"></i></a></li><div id=API class=collapse><ul class=sub-menu><li><a href=./java-api-quickstart/>Java Quickstart</a></li><li><a href=./api/>Java API</a></li><li><a href=./custom-catalog/>Java Custom Catalog</a></li></ul></div><li><a class="chevron-toggle collapsed" data-toggle=collapse data-parent=full href=#Migration><span>Migration</span> |
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| <i class="fa fa-chevron-down"></i></a></li><div id=Migration class=collapse><ul class=sub-menu><li><a href=./table-migration/>Overview</a></li><li><a href=./hive-migration/>Hive Migration</a></li><li><a href=./delta-lake-migration/>Delta Lake Migration</a></li></ul></div><li><a href=https://iceberg.apache.org/docs/fd-update-slack-url/../../javadoc/latest><span>Javadoc</span></a></li><li><a target=_blank href=https://py.iceberg.apache.org/><span>PyIceberg</span></a></li></div></div><div id=content class=markdown-body><div class=margin-for-toc><h1 id=documentation>Documentation</h1><p><strong>Apache Iceberg is an open table format for huge analytic datasets.</strong> Iceberg adds tables to compute engines including Spark, Trino, PrestoDB, Flink, Hive and Impala using a high-performance table format that works just like a SQL table.</p><h3 id=user-experience>User experience</h3><p>Iceberg avoids unpleasant surprises. Schema evolution works and won’t inadvertently un-delete data. Users don’t need to know about partitioning to get fast queries.</p><ul><li><a href=evolution#schema-evolution>Schema evolution</a> supports add, drop, update, or rename, and has <a href=evolution#correctness>no side-effects</a></li><li><a href=partitioning>Hidden partitioning</a> prevents user mistakes that cause silently incorrect results or extremely slow queries</li><li><a href=evolution#partition-evolution>Partition layout evolution</a> can update the layout of a table as data volume or query patterns change</li><li><a href=spark-queries#time-travel>Time travel</a> enables reproducible queries that use exactly the same table snapshot, or lets users easily examine changes</li><li>Version rollback allows users to quickly correct problems by resetting tables to a good state</li></ul><h3 id=reliability-and-performance>Reliability and performance</h3><p>Iceberg was built for huge tables. Iceberg is used in production where a single table can contain tens of petabytes of data and even these huge tables can be read without a distributed SQL engine.</p><ul><li><a href=performance#scan-planning>Scan planning is fast</a> – a distributed SQL engine isn’t needed to read a table or find files</li><li><a href=performance#data-filtering>Advanced filtering</a> – data files are pruned with partition and column-level stats, using table metadata</li></ul><p>Iceberg was designed to solve correctness problems in eventually-consistent cloud object stores.</p><ul><li><a href=reliability>Works with any cloud store</a> and reduces NN congestion when in HDFS, by avoiding listing and renames</li><li><a href=reliability>Serializable isolation</a> – table changes are atomic and readers never see partial or uncommitted changes</li><li><a href=reliability#concurrent-write-operations>Multiple concurrent writers</a> use optimistic concurrency and will retry to ensure that compatible updates succeed, even when writes conflict</li></ul><h3 id=open-standard>Open standard</h3><p>Iceberg has been designed and developed to be an open community standard with a <a href=../../spec>specification</a> to ensure compatibility across languages and implementations.</p><p><a href=../../community>Apache Iceberg is open source</a>, and is developed at the <a href=https://www.apache.org/>Apache Software Foundation</a>.</p></div><div id=toc class=markdown-body><div id=full><nav id=TableOfContents><ul><li><ul><li><a href=#user-experience>User experience</a></li><li><a href=#reliability-and-performance>Reliability and performance</a></li><li><a href=#open-standard>Open standard</a></li></ul></li></ul></nav></div></div></div></div></section></body><script src=https://iceberg.apache.org/docs/fd-update-slack-url//js/jquery-1.11.0.js></script><script src=https://iceberg.apache.org/docs/fd-update-slack-url//js/jquery.easing.min.js></script><script type=text/javascript src=https://iceberg.apache.org/docs/fd-update-slack-url//js/search.js></script><script src=https://iceberg.apache.org/docs/fd-update-slack-url//js/bootstrap.min.js></script><script src=https://iceberg.apache.org/docs/fd-update-slack-url//js/iceberg-theme.js></script></html> |
