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--><!-- TOC --><h1 id="常见问题" tabindex="-1"><a class="header-anchor" href="#常见问题" aria-hidden="true">#</a> 常见问题</h1><p><strong>如何查询我的 IoTDB 版本</strong></p><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"><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"><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"><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"><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><p><strong>在哪里可以找到 IoTDB 的日志</strong></p><p>假设您的根目录是：</p><div class="language-bash line-numbers-mode" data-ext="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><p><strong>在哪里可以找到 IoTDB 的数据文件</strong></p><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><p><strong>如何知道 IoTDB 中存储了多少时间序列</strong></p><p>使用 IoTDB 的命令行接口：</p><div class="language-text line-numbers-mode" data-ext="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>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"><pre class="language-text"><code>IoTDB&gt; count timeseries root
</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"><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><p><strong>可以使用 Hadoop 和 Spark 读取 IoTDB 中的 TsFile 吗？</strong></p><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/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/spark" 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/grafana" 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><p><strong>IoTDB 如何处理重复的数据点</strong></p><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><p><strong>我如何知道具体的 timeseries 的类型</strong></p><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"><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"><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"><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><p><strong>如何更改 IoTDB 的客户端时间显示格式</strong></p><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"><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><p><strong>怎么处理来自<code>org.apache.ratis.grpc.server.GrpcLogAppender</code>的<code>IndexOutOfBoundsException</code></strong></p><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。 已经报告给Ratis社区，并会在未来的版本中修复。</p></div><!----><footer class="page-meta"><div class="meta-item edit-link"><a href="https://github.com/apache/iotdb/edit/rel/1.0/docs/zh/UserGuide/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 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="meta-item git-info"><!----><!----></div></footer><nav class="page-nav"><!----><a href="/zh/UserGuide/V1.0.x/FAQ/FAQ-for-cluster-setup.html" class="nav-link next" aria-label="分布式部署FAQ"><div class="hint">下一页<span class="arrow end"></span></div><div class="link">分布式部署FAQ<!----></div></a></nav><!----><!----><!--]--></main><!--]--><footer style="padding-bottom:2rem;"><span id="doc-version" style="display:none;">rel/1.0</span><p style="text-align:center;color:#909399;font-size:12px;margin:0 30px;">Copyright © 2023 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><p style="text-align:center;margin-top:10px;color:#909399;font-size:12px;margin:0 30px;"> We use <a href="https://analytics.google.com">Google Analytics</a> to collect anonymous, aggregated usage information. </p></footer></div><!--]--><!--]--><!----><!--]--></div>
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