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  <div class="section" id="new-features-in-apache-cassandra-4-0">
<h1>New Features in Apache Cassandra 4.0<a class="headerlink" href="#new-features-in-apache-cassandra-4-0" title="Permalink to this headline">¶</a></h1>
<p>This section covers the new features in Apache Cassandra 4.0.</p>
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<li class="toctree-l2"><a class="reference internal" href="java11.html#support-matrix">Support Matrix</a></li>
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<li class="toctree-l2"><a class="reference internal" href="virtualtables.html#definition">Definition</a></li>
<li class="toctree-l2"><a class="reference internal" href="virtualtables.html#objective">Objective</a></li>
<li class="toctree-l2"><a class="reference internal" href="virtualtables.html#how-are-virtual-tables-different-from-regular-tables">How  are Virtual Tables different from regular tables?</a></li>
<li class="toctree-l2"><a class="reference internal" href="virtualtables.html#virtual-keyspaces">Virtual Keyspaces</a></li>
<li class="toctree-l2"><a class="reference internal" href="virtualtables.html#virtual-table-limitations">Virtual Table Limitations</a></li>
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<li class="toctree-l2"><a class="reference internal" href="virtualtables.html#the-system-virtual-schema-keyspace">The system_virtual_schema keyspace</a></li>
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<li class="toctree-l1"><a class="reference internal" href="auditlogging.html">Audit Logging</a><ul>
<li class="toctree-l2"><a class="reference internal" href="auditlogging.html#what-does-audit-logging-log">What does Audit Logging Log?</a></li>
<li class="toctree-l2"><a class="reference internal" href="auditlogging.html#what-audit-logging-does-not-log">What Audit Logging does not Log?</a></li>
<li class="toctree-l2"><a class="reference internal" href="auditlogging.html#audit-logging-is-flexible-and-configurable">Audit Logging is Flexible and Configurable</a></li>
<li class="toctree-l2"><a class="reference internal" href="auditlogging.html#configuring-audit-logging">Configuring Audit Logging</a></li>
<li class="toctree-l2"><a class="reference internal" href="auditlogging.html#using-nodetool-to-enable-audit-logging">Using Nodetool to Enable Audit Logging</a></li>
<li class="toctree-l2"><a class="reference internal" href="auditlogging.html#viewing-the-audit-logs">Viewing the Audit Logs</a></li>
<li class="toctree-l2"><a class="reference internal" href="auditlogging.html#an-audit-logging-demo">An Audit Logging Demo</a></li>
<li class="toctree-l2"><a class="reference internal" href="auditlogging.html#diagnostic-events-for-user-audit-logging">Diagnostic events for user audit logging</a></li>
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<li class="toctree-l2"><a class="reference internal" href="fqllogging.html#objective">Objective</a></li>
<li class="toctree-l2"><a class="reference internal" href="fqllogging.html#full-query-logger">Full Query Logger</a></li>
<li class="toctree-l2"><a class="reference internal" href="fqllogging.html#configuring-full-query-logging">Configuring Full Query Logging</a></li>
<li class="toctree-l2"><a class="reference internal" href="fqllogging.html#running-cql-statements">Running CQL Statements</a></li>
<li class="toctree-l2"><a class="reference internal" href="fqllogging.html#viewing-the-full-query-logs">Viewing the Full Query Logs</a></li>
<li class="toctree-l2"><a class="reference internal" href="fqllogging.html#full-query-replay">Full Query Replay</a></li>
<li class="toctree-l2"><a class="reference internal" href="fqllogging.html#full-query-compare">Full Query Compare</a></li>
<li class="toctree-l2"><a class="reference internal" href="fqllogging.html#performance-overhead-of-fql">Performance Overhead of FQL</a></li>
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<li class="toctree-l1"><a class="reference internal" href="messaging.html">Improved Internode Messaging</a><ul>
<li class="toctree-l2"><a class="reference internal" href="messaging.html#optimized-internode-messaging-protocol">Optimized Internode Messaging Protocol</a></li>
<li class="toctree-l2"><a class="reference internal" href="messaging.html#nio-messaging">NIO Messaging</a></li>
<li class="toctree-l2"><a class="reference internal" href="messaging.html#resource-limits-on-queued-messages">Resource limits on Queued Messages</a></li>
<li class="toctree-l2"><a class="reference internal" href="messaging.html#virtual-tables-for-messaging-metrics">Virtual Tables for Messaging Metrics</a></li>
<li class="toctree-l2"><a class="reference internal" href="messaging.html#hint-messaging">Hint Messaging</a></li>
<li class="toctree-l2"><a class="reference internal" href="messaging.html#internode-application-timeout">Internode Application Timeout</a></li>
<li class="toctree-l2"><a class="reference internal" href="messaging.html#paxos-prepare-and-propose-stage-for-local-requests-optimized">Paxos prepare and propose stage for local requests optimized</a></li>
<li class="toctree-l2"><a class="reference internal" href="messaging.html#quality-assurance">Quality Assurance</a></li>
<li class="toctree-l2"><a class="reference internal" href="messaging.html#added-a-message-size-limit">Added a Message size limit</a></li>
<li class="toctree-l2"><a class="reference internal" href="messaging.html#recover-from-unknown-table-when-deserializing-internode-messages">Recover from unknown table when deserializing internode messages</a></li>
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<li class="toctree-l1"><a class="reference internal" href="streaming.html">Improved Streaming</a><ul>
<li class="toctree-l2"><a class="reference internal" href="streaming.html#streaming-based-on-netty">Streaming based on Netty</a></li>
<li class="toctree-l2"><a class="reference internal" href="streaming.html#zero-copy-streaming">Zero Copy Streaming</a></li>
<li class="toctree-l2"><a class="reference internal" href="streaming.html#repair-streaming-preview">Repair Streaming Preview</a></li>
<li class="toctree-l2"><a class="reference internal" href="streaming.html#parallelizing-of-streaming-of-keyspaces">Parallelizing of Streaming of Keyspaces</a></li>
<li class="toctree-l2"><a class="reference internal" href="streaming.html#unique-nodes-for-streaming-in-multi-dc-deployment">Unique nodes for Streaming in Multi-DC deployment</a></li>
<li class="toctree-l2"><a class="reference internal" href="streaming.html#stream-operation-types">Stream Operation Types</a></li>
<li class="toctree-l2"><a class="reference internal" href="streaming.html#disallow-decommission-when-number-of-replicas-will-drop-below-configured-rf">Disallow Decommission when number of Replicas will drop below configured RF</a></li>
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<li class="toctree-l1"><a class="reference internal" href="transientreplication.html">Transient Replication</a><ul>
<li class="toctree-l2"><a class="reference internal" href="transientreplication.html#objective">Objective</a></li>
<li class="toctree-l2"><a class="reference internal" href="transientreplication.html#enabling-transient-replication">Enabling Transient Replication</a></li>
<li class="toctree-l2"><a class="reference internal" href="transientreplication.html#cheap-quorums">Cheap Quorums</a></li>
<li class="toctree-l2"><a class="reference internal" href="transientreplication.html#speculative-write-option">Speculative Write Option</a></li>
<li class="toctree-l2"><a class="reference internal" href="transientreplication.html#pending-ranges-and-transient-replicas">Pending Ranges and Transient Replicas</a></li>
<li class="toctree-l2"><a class="reference internal" href="transientreplication.html#read-repair-and-transient-replicas">Read Repair and Transient Replicas</a></li>
<li class="toctree-l2"><a class="reference internal" href="transientreplication.html#transitioning-between-full-replicas-and-transient-replicas">Transitioning between Full Replicas and Transient Replicas</a></li>
<li class="toctree-l2"><a class="reference internal" href="transientreplication.html#transient-replication-supports-each-quorum">Transient Replication supports EACH_QUORUM</a></li>
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