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internal" href="#">Adding, replacing, moving and removing nodes</a><ul> +<li class="toctree-l3"><a class="reference internal" href="#bootstrap">Bootstrap</a></li> +<li class="toctree-l3"><a class="reference internal" href="#removing-nodes">Removing nodes</a></li> +<li class="toctree-l3"><a class="reference internal" href="#moving-nodes">Moving nodes</a></li> +<li class="toctree-l3"><a class="reference internal" href="#replacing-a-dead-node">Replacing a dead node</a></li> +<li class="toctree-l3"><a class="reference internal" href="#monitoring-progress">Monitoring progress</a></li> +<li class="toctree-l3"><a class="reference internal" href="#cleanup-data-after-range-movements">Cleanup data after range movements</a></li> +</ul> +</li> +<li class="toctree-l2"><a class="reference internal" href="repair.html">Repair</a></li> +<li class="toctree-l2"><a class="reference internal" href="read_repair.html">Read repair</a></li> +<li class="toctree-l2"><a class="reference internal" 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href="#adding-replacing-moving-and-removing-nodes" title="Permalink to this headline">¶</a></h1> +<div class="section" id="bootstrap"> +<h2>Bootstrap<a class="headerlink" href="#bootstrap" title="Permalink to this headline">¶</a></h2> +<p>Adding new nodes is called “bootstrapping”. The <code class="docutils literal"><span class="pre">num_tokens</span></code> parameter will define the amount of virtual nodes +(tokens) the joining node will be assigned during bootstrap. The tokens define the sections of the ring (token ranges) +the node will become responsible for.</p> +<div class="section" id="token-allocation"> +<h3>Token allocation<a class="headerlink" href="#token-allocation" title="Permalink to this headline">¶</a></h3> +<p>With the default token allocation algorithm the new node will pick <code class="docutils literal"><span class="pre">num_tokens</span></code> random tokens to become responsible +for. Since tokens are distributed randomly, load distribution improves with a higher amount of virtual nodes, but it +also increases token management overhead. The default of 256 virtual nodes should provide a reasonable load balance with +acceptable overhead.</p> +<p>On 3.0+ a new token allocation algorithm was introduced to allocate tokens based on the load of existing virtual nodes +for a given keyspace, and thus yield an improved load distribution with a lower number of tokens. To use this approach, +the new node must be started with the JVM option <code class="docutils literal"><span class="pre">-Dcassandra.allocate_tokens_for_keyspace=<keyspace></span></code>, where +<code class="docutils literal"><span class="pre"><keyspace></span></code> is the keyspace from which the algorithm can find the load information to optimize token assignment for.</p> +<div class="section" id="manual-token-assignment"> +<h4>Manual token assignment<a class="headerlink" href="#manual-token-assignment" title="Permalink to this headline">¶</a></h4> +<p>You may specify a comma-separated list of tokens manually with the <code class="docutils literal"><span class="pre">initial_token</span></code> <code class="docutils literal"><span class="pre">cassandra.yaml</span></code> parameter, and +if that is specified Cassandra will skip the token allocation process. This may be useful when doing token assignment +with an external tool or when restoring a node with its previous tokens.</p> +</div> +</div> +<div class="section" id="range-streaming"> +<h3>Range streaming<a class="headerlink" href="#range-streaming" title="Permalink to this headline">¶</a></h3> +<p>After the tokens are allocated, the joining node will pick current replicas of the token ranges it will become +responsible for to stream data from. By default it will stream from the primary replica of each token range in order to +guarantee data in the new node will be consistent with the current state.</p> +<p>In the case of any unavailable replica, the consistent bootstrap process will fail. To override this behavior and +potentially miss data from an unavailable replica, set the JVM flag <code class="docutils literal"><span class="pre">-Dcassandra.consistent.rangemovement=false</span></code>.</p> +</div> +<div class="section" id="resuming-failed-hanged-bootstrap"> +<h3>Resuming failed/hanged bootstrap<a class="headerlink" href="#resuming-failed-hanged-bootstrap" title="Permalink to this headline">¶</a></h3> +<p>On 2.2+, if the bootstrap process fails, it’s possible to resume bootstrap from the previous saved state by calling +<code class="docutils literal"><span class="pre">nodetool</span> <span class="pre">bootstrap</span> <span class="pre">resume</span></code>. If for some reason the bootstrap hangs or stalls, it may also be resumed by simply +restarting the node. In order to cleanup bootstrap state and start fresh, you may set the JVM startup flag +<code class="docutils literal"><span class="pre">-Dcassandra.reset_bootstrap_progress=true</span></code>.</p> +<p>On lower versions, when the bootstrap proces fails it is recommended to wipe the node (remove all the data), and restart +the bootstrap process again.</p> +</div> +<div class="section" id="manual-bootstrapping"> +<h3>Manual bootstrapping<a class="headerlink" href="#manual-bootstrapping" title="Permalink to this headline">¶</a></h3> +<p>It’s possible to skip the bootstrapping process entirely and join the ring straight away by setting the hidden parameter +<code class="docutils literal"><span class="pre">auto_bootstrap:</span> <span class="pre">false</span></code>. This may be useful when restoring a node from a backup or creating a new data-center.</p> +</div> +</div> +<div class="section" id="removing-nodes"> +<h2>Removing nodes<a class="headerlink" href="#removing-nodes" title="Permalink to this headline">¶</a></h2> +<p>You can take a node out of the cluster with <code class="docutils literal"><span class="pre">nodetool</span> <span class="pre">decommission</span></code> to a live node, or <code class="docutils literal"><span class="pre">nodetool</span> <span class="pre">removenode</span></code> (to any +other machine) to remove a dead one. This will assign the ranges the old node was responsible for to other nodes, and +replicate the appropriate data there. If decommission is used, the data will stream from the decommissioned node. If +removenode is used, the data will stream from the remaining replicas.</p> +<p>No data is removed automatically from the node being decommissioned, so if you want to put the node back into service at +a different token on the ring, it should be removed manually.</p> +</div> +<div class="section" id="moving-nodes"> +<h2>Moving nodes<a class="headerlink" href="#moving-nodes" title="Permalink to this headline">¶</a></h2> +<p>When <code class="docutils literal"><span class="pre">num_tokens:</span> <span class="pre">1</span></code> it’s possible to move the node position in the ring with <code class="docutils literal"><span class="pre">nodetool</span> <span class="pre">move</span></code>. Moving is both a +convenience over and more efficient than decommission + bootstrap. After moving a node, <code class="docutils literal"><span class="pre">nodetool</span> <span class="pre">cleanup</span></code> should be +run to remove any unnecessary data.</p> +</div> +<div class="section" id="replacing-a-dead-node"> +<h2>Replacing a dead node<a class="headerlink" href="#replacing-a-dead-node" title="Permalink to this headline">¶</a></h2> +<p>In order to replace a dead node, start cassandra with the JVM startup flag +<code class="docutils literal"><span class="pre">-Dcassandra.replace_address_first_boot=<dead_node_ip></span></code>. Once this property is enabled the node starts in a hibernate +state, during which all the other nodes will see this node to be down.</p> +<p>The replacing node will now start to bootstrap the data from the rest of the nodes in the cluster. The main difference +between normal bootstrapping of a new node is that this new node will not accept any writes during this phase.</p> +<p>Once the bootstrapping is complete the node will be marked “UP”, we rely on the hinted handoff’s for making this node +consistent (since we don’t accept writes since the start of the bootstrap).</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">If the replacement process takes longer than <code class="docutils literal"><span class="pre">max_hint_window_in_ms</span></code> you <strong>MUST</strong> run repair to make the +replaced node consistent again, since it missed ongoing writes during bootstrapping.</p> +</div> +</div> +<div class="section" id="monitoring-progress"> +<h2>Monitoring progress<a class="headerlink" href="#monitoring-progress" title="Permalink to this headline">¶</a></h2> +<p>Bootstrap, replace, move and remove progress can be monitored using <code class="docutils literal"><span class="pre">nodetool</span> <span class="pre">netstats</span></code> which will show the progress +of the streaming operations.</p> +</div> +<div class="section" id="cleanup-data-after-range-movements"> +<h2>Cleanup data after range movements<a class="headerlink" href="#cleanup-data-after-range-movements" title="Permalink to this headline">¶</a></h2> +<p>As a safety measure, Cassandra does not automatically remove data from nodes that “lose” part of their token range due +to a range movement operation (bootstrap, move, replace). Run <code class="docutils literal"><span class="pre">nodetool</span> <span class="pre">cleanup</span></code> on the nodes that lost ranges to the +joining node when you are satisfied the new node is up and working. If you do not do this the old data will still be +counted against the load on that node.</p> +</div> +</div> + + + + + <div class="doc-prev-next-links" role="navigation" aria-label="footer navigation"> + + <a href="repair.html" class="btn btn-default pull-right " role="button" title="Repair" accesskey="n">Next <span class="glyphicon glyphicon-circle-arrow-right" aria-hidden="true"></span></a> + + + <a href="snitch.html" class="btn btn-default" role="button" title="Snitch" accesskey="p"><span class="glyphicon glyphicon-circle-arrow-left" aria-hidden="true"></span> Previous</a> + + </div> + + </div> + </div> + </div> + <div class="col-md-2"> + </div> + </div> +</div> + + <footer> + <div class="container"> + <div class="col-md-4 social-blk"> + <span class="social"> + <a href="https://twitter.com/cassandra"; + class="twitter-follow-button" + data-show-count="false" data-size="large">Follow @cassandra</a> + <script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+'://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js,fjs);}}(document, 'script', 'twitter-wjs');</script> + <a href="https://twitter.com/intent/tweet?button_hashtag=cassandra"; + class="twitter-hashtag-button" + data-size="large" + data-related="ApacheCassandra">Tweet #cassandra</a> + <script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+'://platform.twitter.com/widgets.js';fjs.parentNode.insertBefore(js,fjs);}}(document, 'script', 'twitter-wjs');</script> + </span> + </div> + + <div class="col-md-8 trademark"> + <p>© 2016 <a href="http://apache.org";>The Apache Software Foundation</a>. + Apache, the Apache feather logo, and Apache Cassandra are trademarks of The Apache Software Foundation. + <p> + </div> + </div><!-- /.container --> +</footer> + +<!-- Javascript. 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Cassandra's support for replicating across multiple datacenters is best-in-class, providing lower latency for your users and the peace of mind of knowing that you can survive regional outages. +"> + <meta name="keywords" content="cassandra, apache, apache cassandra, distributed storage, key value store, scalability, bigtable, dynamo" /> + <meta name="robots" content="index,follow" /> + <meta name="language" content="en" /> + + <title>Search</title> + + <link rel="canonical" href="http://cassandra.apache.org/doc/3.10/search.html";> + + <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css"; integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous"> + <link rel="stylesheet" href="./../../css/style.css"> + + <link rel="stylesheet" href="./../../css/sphinx.css"> + + + <link rel="top" title="Apache Cassandra Documentation v3.10" href="index.html"/> +</head> + + <body> + <!-- breadcrumbs --> +<div 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