| import{_ as a,C as o,O as r,P as d,ah as l,Q as i,U as e,ai as t,aW as s}from"./framework-62ad666a.js";const c={},u=s(`<h1 id="frequently-asked-questions" tabindex="-1"><a class="header-anchor" href="#frequently-asked-questions" aria-hidden="true">#</a> Frequently Asked Questions</h1><p><strong>How can I identify my version of IoTDB?</strong></p><p>There are several ways to identify the version of IoTDB that you are using:</p><ul><li>Launch IoTDB's Command Line Interface:</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>Check pom.xml file:</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>Use 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>Use Command Line Interface:</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>Where can I find IoTDB logs?</strong></p><p>Suppose your root directory is:</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>$ pwd |
| /workspace/iotdb |
| |
| $ ls -l |
| server/ |
| cli/ |
| pom.xml |
| Readme.md |
| ... |
| </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>Let <code>$IOTDB_HOME = /workspace/iotdb/server/target/iotdb-server-{project.version}</code></p><p>Let <code>$IOTDB_CLI_HOME = /workspace/iotdb/cli/target/iotdb-cli-{project.version}</code></p><p>By default settings, the logs are stored under <code>IOTDB_HOME/logs</code>. You can change log level and storage path by configuring <code>logback.xml</code> under <code>IOTDB_HOME/conf</code>.</p><p><strong>Where can I find IoTDB data files?</strong></p><p>By default settings, the data files (including tsfile, metadata, and WAL files) are stored under <code>IOTDB_HOME/data/datanode</code>.</p><p><strong>How do I know how many time series are stored in IoTDB?</strong></p><p>Use IoTDB's Command Line Interface:</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>In the result, there is a statement shows <code>Total timeseries number</code>, this number is the timeseries number in IoTDB.</p><p>In the current version, IoTDB supports querying the number of time series. Use IoTDB's Command Line Interface:</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>If you are using Linux, you can use the following shell command:</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>Can I use Hadoop and Spark to read TsFile in IoTDB?</strong></p>`,28),p={href:"https://github.com/apache/iotdb/tree/master/hadoop",target:"_blank",rel:"noopener noreferrer"},m={href:"https://github.com/apache/iotdb/tree/master/spark-tsfile",target:"_blank",rel:"noopener noreferrer"},v={href:"https://github.com/apache/iotdb/tree/master/grafana-plugin",target:"_blank",rel:"noopener noreferrer"},g=s(`<p><strong>How does IoTDB handle duplicate points?</strong></p><p>A data point is uniquely identified by a full time series path (e.g. <code>root.vehicle.d0.s0</code>) and timestamp. If you submit a new point with the same path and timestamp as an existing point, IoTDB updates the value of this point instead of inserting a new point.</p><p><strong>How can I tell what type of the specific timeseries?</strong></p><p>Use <code>SHOW TIMESERIES <timeseries path></code> SQL in IoTDB's Command Line Interface:</p><p>For example, if you want to know the type of all timeseries, the <timeseries path> should be <code>root</code>. The statement will be:</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>If you want to query specific sensor, you can replace the <timeseries path> with the sensor name. For example:</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>Otherwise, you can also use wildcard in timeseries path:</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>How can I change IoTDB's Cli time display format?</strong></p><p>The default IoTDB's Cli time display format is readable (e.g. <code>1970-01-01T08:00:00.001</code>), if you want to display time in timestamp type or other readable format, add parameter <code>-disableISO8601</code> in start command:</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>How to handle error <code>IndexOutOfBoundsException</code> from <code>org.apache.ratis.grpc.server.GrpcLogAppender</code>?</strong></p><p>It is an internal error introduced by Ratis 2.4.1 dependency, and we can safely ignore this exception as it will not affect normal operations. We will fix this message in the incoming releases.</p>`,15);function h(_,b){const n=o("ExternalLinkIcon");return r(),d("div",null,[l(` |
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| |
| http://www.apache.org/licenses/LICENSE-2.0 |
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| "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
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| specific language governing permissions and limitations |
| under the License. |
| |
| `),u,i("p",null,[e("Yes. IoTDB has intense integration with Open Source Ecosystem. IoTDB supports "),i("a",p,[e("Hadoop"),t(n)]),e(", "),i("a",m,[e("Spark"),t(n)]),e(" and "),i("a",v,[e("Grafana"),t(n)]),e(" visualization tool.")]),g])}const f=a(c,[["render",h],["__file","Frequently-asked-questions.html.vue"]]);export{f as default}; |
