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如何知道IoTDB中存储了多少时间序列？</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#_5-可以使用hadoop和spark读取iotdb中的tsfile吗">5. 可以使用Hadoop和Spark读取IoTDB中的TsFile吗？</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#_6-iotdb如何处理重复的数据点">6. IoTDB如何处理重复的数据点？</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#_7-我如何知道具体的timeseries的类型">7. 我如何知道具体的timeseries的类型？</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#_8-如何更改iotdb的客户端时间显示格式">8. 如何更改IoTDB的客户端时间显示格式？</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#_9-怎么处理来自org-apache-ratis-grpc-server-grpclogappender的indexoutofboundsexception">9. 怎么处理来自org.apache.ratis.grpc.server.GrpcLogAppender的IndexOutOfBoundsException？</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#_10-预估内存不足报错如何处理">10. 预估内存不足报错如何处理？</a></li><!----><!--]--></ul></li><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#分布式部署-faq">分布式部署 FAQ</a></li><li><ul class="vp-toc-list"><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#集群启停">集群启停</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#集群重启">集群重启</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level3" href="#集群运维">集群运维</a></li><!----><!--]--></ul></li><!--]--></ul><div class="vp-toc-marker" style="top:-1.7rem;"></div></div><!--[--><!----><!--]--></aside></div><!--[--><!----><!--]--><div class="theme-hope-content"><h1 id="常见问题" tabindex="-1"><a class="header-anchor" href="#常见问题"><span>常见问题</span></a></h1><h2 id="一般问题" tabindex="-1"><a class="header-anchor" href="#一般问题"><span>一般问题</span></a></h2><h3 id="_1-如何查询我的iotdb版本" tabindex="-1"><a class="header-anchor" href="#_1-如何查询我的iotdb版本"><span>1. 如何查询我的IoTDB版本？</span></a></h3><p>有几种方法可以识别您使用的 IoTDB 版本：</p><ul><li>启动 IoTDB 的命令行界面：</li></ul><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>&gt; ./start-cli.sh -p 6667 -pw root -u root -h localhost
 _____       _________  ______   ______    
|_   _|     |  _   _  ||_   _ `.|_   _ \   
  | |   .--.|_/ | | \_|  | | `. \ | |_) |  
  | | / .&#39;`\ \  | |      | |  | | |  __&#39;.  
 _| |_| \__. | _| |_    _| |_.&#39; /_| |__) | 
|_____|&#39;.__.&#39; |_____|  |______.&#39;|_______/  version x.x.x
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><ul><li>检查 pom.xml 文件：</li></ul><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>&lt;version&gt;x.x.x&lt;/version&gt;
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>使用 JDBC API:</li></ul><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>String iotdbVersion = tsfileDatabaseMetadata.getDatabaseProductVersion();
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><ul><li>使用命令行接口：</li></ul><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>IoTDB&gt; show version
show version
+---------------+
|version        |
+---------------+
|x.x.x          |
+---------------+
Total line number = 1
It costs 0.241s
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_2-在哪里可以找到iotdb的日志" tabindex="-1"><a class="header-anchor" href="#_2-在哪里可以找到iotdb的日志"><span>2. 在哪里可以找到IoTDB的日志？</span></a></h3><p>假设您的根目录是：</p><div class="language-bash line-numbers-mode" data-ext="sh" data-title="sh"><pre class="language-bash"><code>$ <span class="token builtin class-name">pwd</span>
/workspace/iotdb

$ <span class="token function">ls</span> <span class="token parameter variable">-l</span>
server/
cli/
pom.xml
Readme.md
<span class="token punctuation">..</span>.
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>假如 <code>$IOTDB_HOME = /workspace/iotdb/server/target/iotdb-server-{project.version}</code></p><p>假如 <code>$IOTDB_CLI_HOME = /workspace/iotdb/cli/target/iotdb-cli-{project.version}</code></p><p>在默认的设置里，logs 文件夹会被存储在<code>IOTDB_HOME/logs</code>。您可以在<code>IOTDB_HOME/conf</code>目录下的<code>logback.xml</code>文件中修改日志的级别和日志的存储路径。</p><h3 id="_3-在哪里可以找到iotdb的数据文件" tabindex="-1"><a class="header-anchor" href="#_3-在哪里可以找到iotdb的数据文件"><span>3. 在哪里可以找到IoTDB的数据文件？</span></a></h3><p>在默认的设置里，数据文件（包含 TsFile，metadata，WAL）被存储在<code>IOTDB_HOME/data/datanode</code>文件夹。</p><h3 id="_4-如何知道iotdb中存储了多少时间序列" tabindex="-1"><a class="header-anchor" href="#_4-如何知道iotdb中存储了多少时间序列"><span>4. 如何知道IoTDB中存储了多少时间序列？</span></a></h3><p>使用 IoTDB 的命令行接口：</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>IoTDB&gt; show timeseries
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>在返回的结果里，会展示<code>Total timeseries number</code>，这个数据就是 IoTDB 中 timeseries 的数量。</p><p>在当前版本中，IoTDB 支持直接使用命令行接口查询时间序列的数量：</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>IoTDB&gt; count timeseries
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>如果您使用的是 Linux 操作系统，您可以使用以下的 Shell 命令：</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>&gt; grep &quot;0,root&quot; $IOTDB_HOME/data/system/schema/mlog.txt |  wc -l
&gt;   6
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="_5-可以使用hadoop和spark读取iotdb中的tsfile吗" tabindex="-1"><a class="header-anchor" href="#_5-可以使用hadoop和spark读取iotdb中的tsfile吗"><span>5. 可以使用Hadoop和Spark读取IoTDB中的TsFile吗？</span></a></h3><p>是的。IoTDB 与开源生态紧密结合。IoTDB 支持 <a href="https://github.com/apache/iotdb/tree/master/iotdb-connector/hadoop" target="_blank" rel="noopener noreferrer">Hadoop<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>, <a href="https://github.com/apache/iotdb/tree/master/iotdb-connector/spark-iotdb-connector" target="_blank" rel="noopener noreferrer">Spark<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> 和 <a href="https://github.com/apache/iotdb/tree/master/iotdb-connector/grafana-connector" target="_blank" rel="noopener noreferrer">Grafana<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> 可视化工具。</p><h3 id="_6-iotdb如何处理重复的数据点" tabindex="-1"><a class="header-anchor" href="#_6-iotdb如何处理重复的数据点"><span>6. IoTDB如何处理重复的数据点？</span></a></h3><p>一个数据点是由一个完整的时间序列路径（例如：<code>root.vehicle.d0.s0</code>) 和时间戳唯一标识的。如果您使用与现有点相同的路径和时间戳提交一个新点，那么 IoTDB 将更新这个点的值，而不是插入一个新点。</p><h3 id="_7-我如何知道具体的timeseries的类型" tabindex="-1"><a class="header-anchor" href="#_7-我如何知道具体的timeseries的类型"><span>7. 我如何知道具体的timeseries的类型？</span></a></h3><p>在 IoTDB 的命令行接口中使用 SQL <code>SHOW TIMESERIES &lt;timeseries path&gt;</code>:</p><p>例如：如果您想知道所有 timeseries 的类型 &lt;timeseries path&gt; 应该为 <code>root.**</code>。上面的 SQL 应该修改为：</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>IoTDB&gt; show timeseries root.**
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>如果您想查询一个指定的时间序列，您可以修改 &lt;timeseries path&gt; 为时间序列的完整路径。比如：</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>IoTDB&gt; show timeseries root.fit.d1.s1
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>您还可以在 timeseries 路径中使用通配符：</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>IoTDB&gt; show timeseries root.fit.d1.*
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="_8-如何更改iotdb的客户端时间显示格式" tabindex="-1"><a class="header-anchor" href="#_8-如何更改iotdb的客户端时间显示格式"><span>8. 如何更改IoTDB的客户端时间显示格式？</span></a></h3><p>IoTDB 客户端默认显示的时间是人类可读的（比如：<code>1970-01-01T08:00:00.001</code>)，如果您想显示是时间戳或者其他可读格式，请在启动命令上添加参数<code>-disableISO8601</code>:</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>&gt; $IOTDB_CLI_HOME/sbin/start-cli.sh -h 127.0.0.1 -p 6667 -u root -pw root -disableISO8601
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="_9-怎么处理来自org-apache-ratis-grpc-server-grpclogappender的indexoutofboundsexception" tabindex="-1"><a class="header-anchor" href="#_9-怎么处理来自org-apache-ratis-grpc-server-grpclogappender的indexoutofboundsexception"><span>9. 怎么处理来自<code>org.apache.ratis.grpc.server.GrpcLogAppender</code>的<code>IndexOutOfBoundsException</code>？</span></a></h3><p>这是我们的依赖Ratis 2.4.1的一个内部错误日志，不会对数据写入和读取造成任何影响。<br> 已经报告给Ratis社区，并会在未来的版本中修复。</p><h3 id="_10-预估内存不足报错如何处理" tabindex="-1"><a class="header-anchor" href="#_10-预估内存不足报错如何处理"><span>10. 预估内存不足报错如何处理？</span></a></h3><p>报错信息：</p><div class="language-text line-numbers-mode" data-ext="text" data-title="text"><pre class="language-text"><code>301: There is not enough memory to execute current fragment instance, current remaining free memory is 86762854, estimated memory usage for current fragment instance is 270139392
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>报错分析：<br> datanode_memory_proportion参数控制分给查询的内存，chunk_timeseriesmeta_free_memory_proportion参数控制查询执行可用的内存。<br> 默认情况下分给查询的内存为堆内存*30%，查询执行可用的内存为查询内存的20%。<br> 报错显示当前剩余查询执行可用内存为86762854B=82.74MB，该查询预估使用执行内存270139392B=257.6MB。</p><p>一些可能的改进项：</p><ul><li>在不改变默认参数的前提下，调大IoTDB的堆内存大于 4.2G（4.2G * 1024MB=4300MB），4300M*30%*20%=258M&gt;257.6M，可以满足要求。</li><li>更改 datanode_memory_proportion 等参数，使查询执行可用内存&gt;257.6MB。</li><li>减少导出的时间序列数量。</li><li>给查询语句添加 slimit 限制，也是减少查询时间序列的一种方案。</li><li>添加 align by device，会按照device顺序进行输出，内存占用会降低至单device级别。</li></ul><h2 id="分布式部署-faq" tabindex="-1"><a class="header-anchor" href="#分布式部署-faq"><span>分布式部署 FAQ</span></a></h2><h3 id="集群启停" tabindex="-1"><a class="header-anchor" href="#集群启停"><span>集群启停</span></a></h3><h4 id="_1-confignode初次启动失败-如何排查原因" tabindex="-1"><a class="header-anchor" href="#_1-confignode初次启动失败-如何排查原因"><span>1. ConfigNode初次启动失败，如何排查原因？</span></a></h4><ul><li>ConfigNode初次启动时确保已清空data/confignode目录</li><li>确保该ConfigNode使用到的&lt;IP+端口&gt;没有被占用，没有与已启动的ConfigNode使用到的&lt;IP+端口&gt;冲突</li><li>确保该ConfigNode的cn_seed_config_node（指向存活的ConfigNode；如果该ConfigNode是启动的第一个ConfigNode，该值指向自身）配置正确</li><li>确保该ConfigNode的配置项（共识协议、副本数等）等与cn_seed_config_node对应的ConfigNode集群一致</li></ul><h4 id="_2-confignode初次启动成功-show-cluster的结果里为何没有该节点" tabindex="-1"><a class="header-anchor" href="#_2-confignode初次启动成功-show-cluster的结果里为何没有该节点"><span>2. ConfigNode初次启动成功，show cluster的结果里为何没有该节点？</span></a></h4><ul><li>检查cn_seed_config_node是否正确指向了正确的地址； 如果cn_seed_config_node指向了自身，则会启动一个新的ConfigNode集群</li></ul><h4 id="_3-datanode初次启动失败-如何排查原因" tabindex="-1"><a class="header-anchor" href="#_3-datanode初次启动失败-如何排查原因"><span>3. DataNode初次启动失败，如何排查原因？</span></a></h4><ul><li>DataNode初次启动时确保已清空data/datanode目录。 如果启动结果为“Reject DataNode restart.”则表示启动时可能没有清空data/datanode目录</li><li>确保该DataNode使用到的&lt;IP+端口&gt;没有被占用，没有与已启动的DataNode使用到的&lt;IP+端口&gt;冲突</li><li>确保该DataNode的dn_seed_config_node指向存活的ConfigNode</li></ul><h4 id="_4-移除datanode执行失败-如何排查" tabindex="-1"><a class="header-anchor" href="#_4-移除datanode执行失败-如何排查"><span>4. 移除DataNode执行失败，如何排查？</span></a></h4><ul><li>检查remove-datanode脚本的参数是否正确，是否传入了正确的ip:port或正确的dataNodeId</li><li>只有集群可用节点数量 &gt; max(元数据副本数量, 数据副本数量)时，移除操作才允许被执行</li><li>执行移除DataNode的过程会将该DataNode上的数据迁移到其他存活的DataNode，数据迁移以Region为粒度，如果某个Region迁移失败，则被移除的DataNode会一直处于Removing状态</li><li>补充：处于Removing状态的节点，其节点上的Region也是Removing或Unknown状态，即不可用状态。 该Remvoing状态的节点也不会接受客户端的请求。如果要使Removing状态的节点变为可用，用户可以使用set system status to running 命令将该节点设置为Running状态；如果要使迁移失败的Region处于可用状态，可以使用migrate region from datanodeId1 to datanodeId2 命令将该不可用的Region迁移到其他存活的节点。<a href="http://xn--IoTDBremove-datanode-f055at3i1sdn52bz2aw07gus4dzw4i.sh" target="_blank" rel="noopener noreferrer">另外IoTDB后续也会提供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> -f命令，来强制移除节点（迁移失败的Region会直接丢弃）</li></ul><h4 id="_5-挂掉的datanode是否支持移除" tabindex="-1"><a class="header-anchor" href="#_5-挂掉的datanode是否支持移除"><span>5. 挂掉的DataNode是否支持移除？</span></a></h4><ul><li>当前集群副本数量大于1时可以移除。 如果集群副本数量等于1，则不支持移除。 在下个版本会推出强制移除的命令</li></ul><h4 id="_6-从0-13升级到1-0需要注意什么" tabindex="-1"><a class="header-anchor" href="#_6-从0-13升级到1-0需要注意什么"><span>6. 从0.13升级到1.0需要注意什么？</span></a></h4><ul><li>0.13版本与1.0版本的文件目录结构是不同的，不能将0.13的data目录直接拷贝到1.0集群使用。如果需要将0.13的数据导入至1.0，可以使用LOAD功能</li><li>0.13版本的默认RPC地址是0.0.0.0，1.0版本的默认RPC地址是127.0.0.1</li></ul><h3 id="集群重启" tabindex="-1"><a class="header-anchor" href="#集群重启"><span>集群重启</span></a></h3><h4 id="_1-如何重启集群中的某个confignode" tabindex="-1"><a class="header-anchor" href="#_1-如何重启集群中的某个confignode"><span>1. 如何重启集群中的某个ConfigNode？</span></a></h4><ul><li>第一步：通过stop-confignode.sh或kill进程方式关闭ConfigNode进程</li><li>第二步：通过执行start-confignode.sh启动ConfigNode进程实现重启</li><li>下个版本IoTDB会提供一键重启的操作</li></ul><h4 id="_2-如何重启集群中的某个datanode" tabindex="-1"><a class="header-anchor" href="#_2-如何重启集群中的某个datanode"><span>2. 如何重启集群中的某个DataNode？</span></a></h4><ul><li>第一步：通过stop-datanode.sh或kill进程方式关闭DataNode进程</li><li>第二步：通过执行start-datanode.sh启动DataNode进程实现重启</li><li>下个版本IoTDB会提供一键重启的操作</li></ul><h4 id="_3-将某个confignode移除后-remove-confignode-能否再利用该confignode的data目录重启" tabindex="-1"><a class="header-anchor" href="#_3-将某个confignode移除后-remove-confignode-能否再利用该confignode的data目录重启"><span>3. 将某个ConfigNode移除后（remove-confignode），能否再利用该ConfigNode的data目录重启？</span></a></h4><ul><li>不能。会报错：Reject ConfigNode restart. Because there are no corresponding ConfigNode(whose nodeId=xx) in the cluster.</li></ul><h4 id="_4-将某个datanode移除后-remove-datanode-能否再利用该datanode的data目录重启" tabindex="-1"><a class="header-anchor" href="#_4-将某个datanode移除后-remove-datanode-能否再利用该datanode的data目录重启"><span>4. 将某个DataNode移除后（remove-datanode），能否再利用该DataNode的data目录重启？</span></a></h4><ul><li>不能正常重启，启动结果为“Reject DataNode restart. Because there are no corresponding DataNode(whose nodeId=xx) in the cluster. Possible solutions are as follows:...”</li></ul><h4 id="_5-用户看到某个confignode-datanode变成了unknown状态-在没有kill对应进程的情况下-直接删除掉confignode-datanode对应的data目录-然后执行start-confignode-sh-start-datanode-sh-这种情况下能成功吗" tabindex="-1"><a class="header-anchor" href="#_5-用户看到某个confignode-datanode变成了unknown状态-在没有kill对应进程的情况下-直接删除掉confignode-datanode对应的data目录-然后执行start-confignode-sh-start-datanode-sh-这种情况下能成功吗"><span>5. 用户看到某个ConfigNode/DataNode变成了Unknown状态，在没有kill对应进程的情况下，直接删除掉ConfigNode/DataNode对应的data目录，<a href="http://xn--start-confignode-p301a820q612chrvf.sh/start-datanode.sh%EF%BC%8C%E8%BF%99%E7%A7%8D%E6%83%85%E5%86%B5%E4%B8%8B%E8%83%BD%E6%88%90%E5%8A%9F%E5%90%97" target="_blank" rel="noopener noreferrer">然后执行start-confignode.sh/start-datanode.sh，这种情况下能成功吗<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>?</span></a></h4><ul><li>无法启动成功，会报错端口已被占用</li></ul><h3 id="集群运维" tabindex="-1"><a class="header-anchor" href="#集群运维"><span>集群运维</span></a></h3><h4 id="_1-show-cluster执行失败-显示-please-check-server-status-如何排查" tabindex="-1"><a class="header-anchor" href="#_1-show-cluster执行失败-显示-please-check-server-status-如何排查"><span>1. Show cluster执行失败，显示“please check server status”，如何排查?</span></a></h4><ul><li>确保ConfigNode集群一半以上的节点处于存活状态</li><li>确保客户端连接的DataNode处于存活状态</li></ul><h4 id="_2-某一datanode节点的磁盘文件损坏-如何修复这个节点" tabindex="-1"><a class="header-anchor" href="#_2-某一datanode节点的磁盘文件损坏-如何修复这个节点"><span>2. 某一DataNode节点的磁盘文件损坏，如何修复这个节点?</span></a></h4><ul><li>当前只能通过remove-datanode的方式进行实现。remove-datanode执行的过程中会将该DataNode上的数据迁移至其他存活的DataNode节点（前提是集群设置的副本数大于1）</li><li>下个版本IoTDB会提供一键修复节点的功能</li></ul><h4 id="_3-如何降低confignode、datanode使用的内存" tabindex="-1"><a class="header-anchor" href="#_3-如何降低confignode、datanode使用的内存"><span>3. 如何降低ConfigNode、DataNode使用的内存？</span></a></h4><ul><li>在conf/confignode-env.sh、conf/datanode-env.sh文件可通过调整ON_HEAP_MEMORY、OFF_HEAP_MEMORY等选项可以调整ConfigNode、DataNode使用的最大堆内、堆外内存</li></ul></div><!--[--><!----><!--]--><footer class="vp-page-meta"><div class="vp-meta-item edit-link"><a href="https://github.com/apache/iotdb-docs/edit/main/src/zh/UserGuide/latest/FAQ/Frequently-asked-questions.md" rel="noopener noreferrer" target="_blank" aria-label="发现错误？在 GitHub 上编辑此页" class="nav-link vp-meta-label"><!--[--><svg xmlns="http://www.w3.org/2000/svg" class="icon edit-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="edit icon"><path d="M430.818 653.65a60.46 60.46 0 0 1-50.96-93.281l71.69-114.012 7.773-10.365L816.038 80.138A60.46 60.46 0 0 1 859.225 62a60.46 60.46 0 0 1 43.186 18.138l43.186 43.186a60.46 60.46 0 0 1 0 86.373L588.879 565.55l-8.637 8.637-117.466 68.234a60.46 60.46 0 0 1-31.958 11.229z"></path><path d="M728.802 962H252.891A190.883 190.883 0 0 1 62.008 771.98V296.934a190.883 190.883 0 0 1 190.883-192.61h267.754a60.46 60.46 0 0 1 0 120.92H252.891a69.962 69.962 0 0 0-69.098 69.099V771.98a69.962 69.962 0 0 0 69.098 69.098h475.911A69.962 69.962 0 0 0 797.9 771.98V503.363a60.46 60.46 0 1 1 120.922 0V771.98A190.883 190.883 0 0 1 728.802 962z"></path></svg><!--]-->发现错误？在 GitHub 上编辑此页<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></div><div class="vp-meta-item git-info"><div class="update-time"><span class="vp-meta-label">上次编辑于: </span><!----></div><!----></div></footer><!----><!----><!--[--><!----><!--]--><!--]--></main><!--]--><footer style="padding-bottom:2rem;"><span id="doc-version" style="display:none;">latest</span><p style="text-align:center;color:#909399;font-size:12px;margin:0 30px;">Copyright © 2024 The Apache Software Foundation.<br> Apache and the Apache feather logo are trademarks of The Apache Software Foundation</p><p style="text-align:center;margin-top:10px;color:#909399;font-size:12px;margin:0 30px;"><strong>Have a question?</strong> Connect with us on QQ, WeChat, or Slack. <a href="https://github.com/apache/iotdb/issues/1995">Join the community</a> now.</p></footer></div><!--]--><!--]--><!--[--><!----><!--]--><!--]--></div>
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