| import{_ as d,C as r,O as o,P as l,ah as t,Q as s,U as e,ai as n,aW as a}from"./framework-e4340ccd.js";const c={},u=a(`<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>> ./start-cli.sh -p 6667 -pw root -u root -h localhost |
| _____ _________ ______ ______ |
| |_ _| | _ _ ||_ _ \`.|_ _ \\ |
| | | .--.|_/ | | \\_| | | \`. \\ | |_) | |
| | | / .'\`\\ \\ | | | | | | | __'. |
| _| |_| \\__. | _| |_ _| |_.' /_| |__) | |
| |_____|'.__.' |_____| |______.'|_______/ 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><version>x.x.x</version> |
| </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> 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> 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> 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>> grep "0,root" $IOTDB_HOME/data/system/schema/mlog.txt | wc -l |
| > 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>`,28),p={href:"https://github.com/apache/iotdb/tree/master/hadoop",target:"_blank",rel:"noopener noreferrer"},v={href:"https://github.com/apache/iotdb/tree/master/spark-tsfile",target:"_blank",rel:"noopener noreferrer"},m={href:"https://github.com/apache/iotdb/tree/master/grafana",target:"_blank",rel:"noopener noreferrer"},g=a(`<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 <timeseries path></code>:</p><p>例如：如果您想知道所有 timeseries 的类型 <timeseries path> 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> 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 <timeseries path> 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> 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> 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>> $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>`,15);function _(b,h){const i=r("ExternalLinkIcon");return o(),l("div",null,[t(` |
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| |
| `),t(" TOC "),u,s("p",null,[e("是的。IoTDB 与开源生态紧密结合。IoTDB 支持 "),s("a",p,[e("Hadoop"),n(i)]),e(", "),s("a",v,[e("Spark"),n(i)]),e(" 和 "),s("a",m,[e("Grafana"),n(i)]),e(" 可视化工具。")]),g])}const I=d(c,[["render",_],["__file","Frequently-asked-questions.html.vue"]]);export{I as default}; |
