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class="title">FAQ</span><span class="arrow down"></span></button><ul class="sidebar-links"><li><!--[--><a href="/UserGuide/V1.1.x/FAQ/Frequently-asked-questions.html" class="nav-link sidebar-link sidebar-page" aria-label="Frequently asked questions"><!---->Frequently asked questions<!----></a><ul class="sidebar-sub-headers"></ul><!--]--></li><li><!--[--><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html" class="router-link-active router-link-exact-active nav-link active sidebar-link sidebar-page active" aria-label="FAQ for cluster setup"><!---->FAQ for cluster setup<!----></a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_1-cluster-startup-and-stop" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="1. Cluster StartUp and Stop"><!---->1. Cluster StartUp and Stop<!----></a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_1-failed-to-start-confignode-for-the-first-time-how-to-find-the-reason" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="1). Failed to start ConfigNode for the first time, how to find the reason?"><!---->1). Failed to start ConfigNode for the first time, how to find the reason?<!----></a><ul class="sidebar-sub-headers"></ul></li><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_2-confignode-is-started-successfully-but-why-the-node-doesn-t-appear-in-the-results-of-show-cluster" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="2). ConfigNode is started successfully, but why the node doesn&#39;t appear in the results of show cluster?"><!---->2). ConfigNode is started successfully, but why the node doesn&#39;t appear in the results of show cluster?<!----></a><ul class="sidebar-sub-headers"></ul></li><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_3-failed-to-start-datanode-for-the-first-time-how-to-find-the-reason" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="3). Failed to start DataNode for the first time, how to find the reason?"><!---->3). Failed to start DataNode for the first time, how to find the reason?<!----></a><ul class="sidebar-sub-headers"></ul></li><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_4-failed-to-remove-datanode-how-to-find-the-reason" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="4). Failed to remove DataNode, how to find the reason?"><!---->4). Failed to remove DataNode, how to find the reason?<!----></a><ul class="sidebar-sub-headers"></ul></li><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_5-whether-the-down-datanode-can-be-removed" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="5). Whether the down DataNode can be removed?"><!---->5). Whether the down DataNode can be removed?<!----></a><ul class="sidebar-sub-headers"></ul></li><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_6-what-should-be-paid-attention-to-when-upgrading-from-0-13-to-1-0" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="6).What should be paid attention to when upgrading from 0.13 to 1.0?"><!---->6).What should be paid attention to when upgrading from 0.13 to 1.0?<!----></a><ul class="sidebar-sub-headers"></ul></li></ul></li><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_2-cluster-restart" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="2. Cluster Restart"><!---->2. Cluster Restart<!----></a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_1-how-to-restart-any-confignode-in-the-cluster" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="1). How to restart any ConfigNode in the cluster?"><!---->1). How to restart any ConfigNode in the cluster?<!----></a><ul class="sidebar-sub-headers"></ul></li><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_2-how-to-restart-any-datanode-in-the-cluster" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="2). How to restart any DataNode in the cluster?"><!---->2). How to restart any DataNode in the cluster?<!----></a><ul class="sidebar-sub-headers"></ul></li><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_3-if-it-s-possible-to-restart-confignode-using-the-old-data-directory-when-it-s-removed" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="3). If it&#39;s possible to restart ConfigNode using the old data directory when it&#39;s removed?"><!---->3). If it&#39;s possible to restart ConfigNode using the old data directory when it&#39;s removed?<!----></a><ul class="sidebar-sub-headers"></ul></li><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_4-if-it-s-possible-to-restart-datanode-using-the-old-data-directory-when-it-s-removed" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="4). If it&#39;s possible to restart DataNode using the old data directory when it&#39;s removed?"><!---->4). If it&#39;s possible to restart DataNode using the old data directory when it&#39;s removed?<!----></a><ul class="sidebar-sub-headers"></ul></li><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_5-can-we-execute-start-confignode-sh-start-datanode-sh-successfully-when-delete-the-data-directory-of-given-confignode-datanode-without-killing-the-pid" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="5). Can we execute start-confignode.sh/start-datanode.sh successfully when delete the data directory of given ConfigNode/DataNode without killing the PID?"><!---->5). Can we execute start-confignode.sh/start-datanode.sh successfully when delete the data directory of given ConfigNode/DataNode without killing the PID?<!----></a><ul class="sidebar-sub-headers"></ul></li></ul></li><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_3-cluster-maintenance" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="3. Cluster Maintenance"><!---->3. Cluster Maintenance<!----></a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_1-how-to-find-the-reason-when-show-cluster-failed-and-error-logs-like-please-check-server-status-are-shown" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="1). How to find the reason when Show cluster failed, and error logs like &quot;please check server status&quot; are shown?"><!---->1). How to find the reason when Show cluster failed, and error logs like &quot;please check server status&quot; are shown?<!----></a><ul class="sidebar-sub-headers"></ul></li><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_2-how-to-fix-one-datanode-when-the-disk-file-is-broken" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="2). How to fix one DataNode when the disk file is broken?"><!---->2). How to fix one DataNode when the disk file is broken?<!----></a><ul class="sidebar-sub-headers"></ul></li><li class="sidebar-sub-header"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_3-how-to-decrease-the-memory-usage-of-confignode-datanode" class="router-link-active router-link-exact-active nav-link sidebar-link heading" aria-label="3). How to decrease the memory usage of ConfigNode/DataNode?"><!---->3). How to decrease the memory usage of ConfigNode/DataNode?<!----></a><ul class="sidebar-sub-headers"></ul></li></ul></li></ul><!--]--></li></ul></section></li><li><section class="sidebar-group"><button class="sidebar-heading clickable"><!----><span class="title">Reference</span><span class="arrow end"></span></button><!----></section></li></ul><!--[--><!----><!--]--></aside><!--[--><main class="page" id="main-content"><!--[--><!----><nav class="breadcrumb disable"></nav><div class="page-title"><h1><!---->FAQ for Cluster Setup</h1><div class="page-info"><!----><!----><!----><!----><span class="page-reading-time-info" aria-label="Reading Time"><svg xmlns="http://www.w3.org/2000/svg" class="icon timer-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="timer icon"><path d="M799.387 122.15c4.402-2.978 7.38-7.897 7.38-13.463v-1.165c0-8.933-7.38-16.312-16.312-16.312H256.33c-8.933 0-16.311 7.38-16.311 16.312v1.165c0 5.825 2.977 10.874 7.637 13.592 4.143 194.44 97.22 354.963 220.201 392.763-122.204 37.542-214.893 196.511-220.2 389.397-4.661 5.049-7.638 11.651-7.638 19.03v5.825h566.49v-5.825c0-7.379-2.849-13.981-7.509-18.9-5.049-193.016-97.867-351.985-220.2-389.527 123.24-37.67 216.446-198.453 220.588-392.892zM531.16 450.445v352.632c117.674 1.553 211.787 40.778 211.787 88.676H304.097c0-48.286 95.149-87.382 213.728-88.676V450.445c-93.077-3.107-167.901-81.297-167.901-177.093 0-8.803 6.99-15.793 15.793-15.793 8.803 0 15.794 6.99 15.794 15.793 0 80.261 63.69 145.635 142.01 145.635s142.011-65.374 142.011-145.635c0-8.803 6.99-15.793 15.794-15.793s15.793 6.99 15.793 15.793c0 95.019-73.789 172.82-165.96 177.093z"></path></svg><span>About 3 min</span><meta property="timeRequired" content="PT3M"></span><!----><!----></div><hr></div><div class="toc-place-holder"><aside id="toc"><!--[--><!----><!--]--><div class="toc-header">On This Page<button class="print-button" title="Print"><svg xmlns="http://www.w3.org/2000/svg" class="icon print-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="print icon"><path d="M819.2 364.8h-44.8V128c0-17.067-14.933-32-32-32H281.6c-17.067 0-32 14.933-32 32v236.8h-44.8C145.067 364.8 96 413.867 96 473.6v192c0 59.733 49.067 108.8 108.8 108.8h44.8V896c0 17.067 14.933 32 32 32h460.8c17.067 0 32-14.933 32-32V774.4h44.8c59.733 0 108.8-49.067 108.8-108.8v-192c0-59.733-49.067-108.8-108.8-108.8zM313.6 160h396.8v204.8H313.6V160zm396.8 704H313.6V620.8h396.8V864zM864 665.6c0 25.6-19.2 44.8-44.8 44.8h-44.8V588.8c0-17.067-14.933-32-32-32H281.6c-17.067 0-32 14.933-32 32v121.6h-44.8c-25.6 0-44.8-19.2-44.8-44.8v-192c0-25.6 19.2-44.8 44.8-44.8h614.4c25.6 0 44.8 19.2 44.8 44.8v192z"></path></svg></button></div><div class="toc-wrapper"><ul class="toc-list"><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_1-cluster-startup-and-stop" class="router-link-active router-link-exact-active toc-link level2">1. Cluster StartUp and Stop</a></li><ul class="toc-list"><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_1-failed-to-start-confignode-for-the-first-time-how-to-find-the-reason" class="router-link-active router-link-exact-active toc-link level3">1). Failed to start ConfigNode for the first time, how to find the reason?</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_2-confignode-is-started-successfully-but-why-the-node-doesn-t-appear-in-the-results-of-show-cluster" class="router-link-active router-link-exact-active toc-link level3">2). ConfigNode is started successfully, but why the node doesn&#39;t appear in the results of show cluster?</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_3-failed-to-start-datanode-for-the-first-time-how-to-find-the-reason" class="router-link-active router-link-exact-active toc-link level3">3). Failed to start DataNode for the first time, how to find the reason?</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_4-failed-to-remove-datanode-how-to-find-the-reason" class="router-link-active router-link-exact-active toc-link level3">4). Failed to remove DataNode, how to find the reason?</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_5-whether-the-down-datanode-can-be-removed" class="router-link-active router-link-exact-active toc-link level3">5). Whether the down DataNode can be removed?</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_6-what-should-be-paid-attention-to-when-upgrading-from-0-13-to-1-0" class="router-link-active router-link-exact-active toc-link level3">6).What should be paid attention to when upgrading from 0.13 to 1.0?</a></li><!----><!--]--></ul><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_2-cluster-restart" class="router-link-active router-link-exact-active toc-link level2">2. Cluster Restart</a></li><ul class="toc-list"><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_1-how-to-restart-any-confignode-in-the-cluster" class="router-link-active router-link-exact-active toc-link level3">1). How to restart any ConfigNode in the cluster?</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_2-how-to-restart-any-datanode-in-the-cluster" class="router-link-active router-link-exact-active toc-link level3">2). How to restart any DataNode in the cluster?</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_3-if-it-s-possible-to-restart-confignode-using-the-old-data-directory-when-it-s-removed" class="router-link-active router-link-exact-active toc-link level3">3). If it&#39;s possible to restart ConfigNode using the old data directory when it&#39;s removed?</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_4-if-it-s-possible-to-restart-datanode-using-the-old-data-directory-when-it-s-removed" class="router-link-active router-link-exact-active toc-link level3">4). If it&#39;s possible to restart DataNode using the old data directory when it&#39;s removed?</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_5-can-we-execute-start-confignode-sh-start-datanode-sh-successfully-when-delete-the-data-directory-of-given-confignode-datanode-without-killing-the-pid" class="router-link-active router-link-exact-active toc-link level3">5). Can we execute start-confignode.sh/start-datanode.sh successfully when delete the data directory of given ConfigNode/DataNode without killing the PID?</a></li><!----><!--]--></ul><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_3-cluster-maintenance" class="router-link-active router-link-exact-active toc-link level2">3. Cluster Maintenance</a></li><ul class="toc-list"><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_1-how-to-find-the-reason-when-show-cluster-failed-and-error-logs-like-please-check-server-status-are-shown" class="router-link-active router-link-exact-active toc-link level3">1). How to find the reason when Show cluster failed, and error logs like &quot;please check server status&quot; are shown?</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_2-how-to-fix-one-datanode-when-the-disk-file-is-broken" class="router-link-active router-link-exact-active toc-link level3">2). How to fix one DataNode when the disk file is broken?</a></li><!----><!--]--><!--[--><li class="toc-item"><a aria-current="page" href="/UserGuide/V1.1.x/FAQ/FAQ-for-cluster-setup.html#_3-how-to-decrease-the-memory-usage-of-confignode-datanode" class="router-link-active router-link-exact-active toc-link level3">3). How to decrease the memory usage of ConfigNode/DataNode?</a></li><!----><!--]--></ul><!--]--></ul></div><!--[--><!----><!--]--></aside></div><!----><div class="theme-hope-content"><!--

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--><!-- TOC --><h1 id="faq-for-cluster-setup" tabindex="-1"><a class="header-anchor" href="#faq-for-cluster-setup" aria-hidden="true">#</a> FAQ for Cluster Setup</h1><h2 id="_1-cluster-startup-and-stop" tabindex="-1"><a class="header-anchor" href="#_1-cluster-startup-and-stop" aria-hidden="true">#</a> 1. Cluster StartUp and Stop</h2><h3 id="_1-failed-to-start-confignode-for-the-first-time-how-to-find-the-reason" tabindex="-1"><a class="header-anchor" href="#_1-failed-to-start-confignode-for-the-first-time-how-to-find-the-reason" aria-hidden="true">#</a> 1). Failed to start ConfigNode for the first time, how to find the reason?</h3><ul><li>Make sure that the data/confignode directory is cleared when start ConfigNode for the first time.</li><li>Make sure that the &lt;IP+Port&gt; used by ConfigNode is not occupied, and the &lt;IP+Port&gt; is also not conflicted with other ConfigNodes.</li><li>Make sure that the <code>cn_target_confignode_list</code> is configured correctly, which points to the alive ConfigNode. And if the ConfigNode is started for the first time, make sure that <code>cn_target_confignode_list</code> points to itself.</li><li>Make sure that the configuration(consensus protocol and replica number) of the started ConfigNode is accord with the <code>cn_target_confignode_list</code> ConfigNode.</li></ul><h3 id="_2-confignode-is-started-successfully-but-why-the-node-doesn-t-appear-in-the-results-of-show-cluster" tabindex="-1"><a class="header-anchor" href="#_2-confignode-is-started-successfully-but-why-the-node-doesn-t-appear-in-the-results-of-show-cluster" aria-hidden="true">#</a> 2). ConfigNode is started successfully, but why the node doesn&#39;t appear in the results of <code>show cluster</code>?</h3><ul><li>Examine whether the <code>cn_target_confignode_list</code> points to the correct address. If <code>cn_target_confignode_list</code> points to itself, a new ConfigNode cluster is started.</li></ul><h3 id="_3-failed-to-start-datanode-for-the-first-time-how-to-find-the-reason" tabindex="-1"><a class="header-anchor" href="#_3-failed-to-start-datanode-for-the-first-time-how-to-find-the-reason" aria-hidden="true">#</a> 3). Failed to start DataNode for the first time, how to find the reason?</h3><ul><li>Make sure that the data/datanode directory is cleared when start DataNode for the first time. If the start result is “Reject DataNode restart.”, maybe the data/datanode directory is not cleared.</li><li>Make sure that the &lt;IP+Port&gt; used by DataNode is not occupied, and the &lt;IP+Port&gt; is also not conflicted with other DataNodes.</li><li>Make sure that the <code>dn_target_confignode_list</code> points to the alive ConfigNode.</li></ul><h3 id="_4-failed-to-remove-datanode-how-to-find-the-reason" tabindex="-1"><a class="header-anchor" href="#_4-failed-to-remove-datanode-how-to-find-the-reason" aria-hidden="true">#</a> 4). Failed to remove DataNode, how to find the reason?</h3><ul><li>Examine whether the parameter of <a href="http://remove-datanode.sh" target="_blank" rel="noopener noreferrer">remove-datanode.sh<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a> is correct, only rpcIp:rpcPort and dataNodeId are correct parameter.</li><li>Only when the number of available DataNodes in the cluster is greater than max(schema_replication_factor, data_replication_factor), removing operation can be executed.</li><li>Removing DataNode will migrate the data from the removing DataNode to other alive DataNodes. Data migration is based on Region, if some regions are migrated failed, the removing DataNode will always in the status of <code>Removing</code>.</li><li>If the DataNode is in the status of <code>Removing</code>, the regions in the removing DataNode will also in the status of <code>Removing</code> or <code>Unknown</code>, which are unavailable status. Besides, the removing DataNode will not receive new write requests from client. And users can use the command <code>set system status to running</code> to make the status of DataNode from Removing to Running; If users want to make the Regions from Removing to available status, command <code>migrate region from datanodeId1 to datanodeId2</code> can take effect, this command can migrate the regions to other alive DataNodes. Besides, IoTDB will publish <code>remove-datanode.sh -f</code> command in the next version, which can remove DataNodes forced (The failed migrated regions will be discarded).</li></ul><h3 id="_5-whether-the-down-datanode-can-be-removed" tabindex="-1"><a class="header-anchor" href="#_5-whether-the-down-datanode-can-be-removed" aria-hidden="true">#</a> 5). Whether the down DataNode can be removed?</h3><ul><li>The down DataNode can be removed only when the replica factor of schema and data is greater than 1.<br> Besides, IoTDB will publish <code>remove-datanode.sh -f</code> function in the next version.</li></ul><h3 id="_6-what-should-be-paid-attention-to-when-upgrading-from-0-13-to-1-0" tabindex="-1"><a class="header-anchor" href="#_6-what-should-be-paid-attention-to-when-upgrading-from-0-13-to-1-0" aria-hidden="true">#</a> 6).What should be paid attention to when upgrading from 0.13 to 1.0?</h3><ul><li>The file structure between 0.13 and 1.0 is different, we can&#39;t copy the data directory from 0.13 to 1.0 to use directly. If you want to load the data from 0.13 to 1.0, you can use the LOAD function.</li><li>The default RPC address of 0.13 is <code>0.0.0.0</code>, but the default RPC address of 1.0 is <code>127.0.0.1</code>.</li></ul><h2 id="_2-cluster-restart" tabindex="-1"><a class="header-anchor" href="#_2-cluster-restart" aria-hidden="true">#</a> 2. Cluster Restart</h2><h3 id="_1-how-to-restart-any-confignode-in-the-cluster" tabindex="-1"><a class="header-anchor" href="#_1-how-to-restart-any-confignode-in-the-cluster" aria-hidden="true">#</a> 1). How to restart any ConfigNode in the cluster?</h3><ul><li>First step: stop the process by <a href="http://stop-confignode.sh" target="_blank" rel="noopener noreferrer">stop-confignode.sh<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a> or kill PID of ConfigNode.</li><li>Second step: execute <a href="http://start-confignode.sh" target="_blank" rel="noopener noreferrer">start-confignode.sh<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a> to restart ConfigNode.</li></ul><h3 id="_2-how-to-restart-any-datanode-in-the-cluster" tabindex="-1"><a class="header-anchor" href="#_2-how-to-restart-any-datanode-in-the-cluster" aria-hidden="true">#</a> 2). How to restart any DataNode in the cluster?</h3><ul><li>First step: stop the process by <a href="http://stop-datanode.sh" target="_blank" rel="noopener noreferrer">stop-datanode.sh<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a> or kill PID of DataNode.</li><li>Second step: execute <a href="http://start-datanode.sh" target="_blank" rel="noopener noreferrer">start-datanode.sh<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a> to restart DataNode.</li></ul><h3 id="_3-if-it-s-possible-to-restart-confignode-using-the-old-data-directory-when-it-s-removed" tabindex="-1"><a class="header-anchor" href="#_3-if-it-s-possible-to-restart-confignode-using-the-old-data-directory-when-it-s-removed" aria-hidden="true">#</a> 3). If it&#39;s possible to restart ConfigNode using the old data directory when it&#39;s removed?</h3><ul><li>Can&#39;t. The running result will be &quot;Reject ConfigNode restart. Because there are no corresponding ConfigNode(whose nodeId=xx) in the cluster&quot;.</li></ul><h3 id="_4-if-it-s-possible-to-restart-datanode-using-the-old-data-directory-when-it-s-removed" tabindex="-1"><a class="header-anchor" href="#_4-if-it-s-possible-to-restart-datanode-using-the-old-data-directory-when-it-s-removed" aria-hidden="true">#</a> 4). If it&#39;s possible to restart DataNode using the old data directory when it&#39;s removed?</h3><ul><li>Can&#39;t. The running result will be &quot;Reject DataNode restart. Because there are no corresponding DataNode(whose nodeId=xx) in the cluster. Possible solutions are as follows:...&quot;.</li></ul><h3 id="_5-can-we-execute-start-confignode-sh-start-datanode-sh-successfully-when-delete-the-data-directory-of-given-confignode-datanode-without-killing-the-pid" tabindex="-1"><a class="header-anchor" href="#_5-can-we-execute-start-confignode-sh-start-datanode-sh-successfully-when-delete-the-data-directory-of-given-confignode-datanode-without-killing-the-pid" aria-hidden="true">#</a> 5). Can we execute <a href="http://start-confignode.sh/start-datanode.sh" target="_blank" rel="noopener noreferrer">start-confignode.sh/start-datanode.sh<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a> successfully when delete the data directory of given ConfigNode/DataNode without killing the PID?</h3><ul><li>Can&#39;t. The running result will be &quot;The port is already occupied&quot;.</li></ul><h2 id="_3-cluster-maintenance" tabindex="-1"><a class="header-anchor" href="#_3-cluster-maintenance" aria-hidden="true">#</a> 3. Cluster Maintenance</h2><h3 id="_1-how-to-find-the-reason-when-show-cluster-failed-and-error-logs-like-please-check-server-status-are-shown" tabindex="-1"><a class="header-anchor" href="#_1-how-to-find-the-reason-when-show-cluster-failed-and-error-logs-like-please-check-server-status-are-shown" aria-hidden="true">#</a> 1). How to find the reason when Show cluster failed, and error logs like &quot;please check server status&quot; are shown?</h3><ul><li>Make sure that more than one half ConfigNodes are alive.</li><li>Make sure that the DataNode connected by the client is alive.</li></ul><h3 id="_2-how-to-fix-one-datanode-when-the-disk-file-is-broken" tabindex="-1"><a class="header-anchor" href="#_2-how-to-fix-one-datanode-when-the-disk-file-is-broken" aria-hidden="true">#</a> 2). How to fix one DataNode when the disk file is broken?</h3><ul><li>We can use <a href="http://remove-datanode.sh" target="_blank" rel="noopener noreferrer">remove-datanode.sh<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a> to fix it. Remove-datanode will migrate the data in the removing DataNode to other alive DataNodes.</li><li>IoTDB will publish Node-Fix tools in the next version.</li></ul><h3 id="_3-how-to-decrease-the-memory-usage-of-confignode-datanode" tabindex="-1"><a class="header-anchor" href="#_3-how-to-decrease-the-memory-usage-of-confignode-datanode" aria-hidden="true">#</a> 3). How to decrease the memory usage of ConfigNode/DataNode?</h3><ul><li>Adjust the MAX_HEAP_SIZE、MAX_DIRECT_MEMORY_SIZE options in conf/confignode-env.sh and conf/datanode-env.sh.</li></ul></div><!----><footer class="page-meta"><div class="meta-item edit-link"><a href="https://github.com/apache/iotdb/edit/rel/1.1/docs/UserGuide/FAQ/FAQ-for-cluster-setup.md" rel="noopener noreferrer" target="_blank" aria-label="Found Error? 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