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| <span><svg 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" class="icon outbound"><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="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading open"><span>IoTDB User Guide (V0.11.x)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Get Started</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Overview</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Concept</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Server</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Client</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Operation Manual</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>System Tools</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Ecosystem Integration</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Architecture</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Comparison with TSDBs</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="introduction"><a href="#introduction" class="header-anchor">#</a> Introduction</h1> <p>IoTDB cluster version provides nodetool, a shell tool for users to monitor the working status of the specified cluster. |
| Users can obtain the status of the cluster by running a variety of instructions.</p> <p>The following describes the usage and examples of each instruction, |
| where $IOTDB_CLUSTER_HOME indicates the path of the distributed IoTDB installation directory.</p> <h1 id="instructions"><a href="#instructions" class="header-anchor">#</a> Instructions</h1> <h2 id="get-started"><a href="#get-started" class="header-anchor">#</a> Get Started</h2> <p>The nodetool shell tool startup script is located at $IOTDB_CLUSTER_HOME/bin folder, |
| you can specify the IP address and port of the cluster during startup.</p> <p>IP is the IP (or hostname) of the node that you expect to connect to, |
| and port is the JMX service port specified when the IoTDB cluster is started.</p> <p>The default values are 127.0.0.1 and 31999, respectively.</p> <p>If you need to monitor the remote cluster or modify the JMX service port number, |
| set the actual IP and port with the <code>-h</code> and <code>-p</code> options.</p> <h2 id="explains"><a href="#explains" class="header-anchor">#</a> Explains</h2> <p>In a distributed system, a node is identified by node IP, metadata port and data port <IP:METAPORT:DATAPORT>.</p> <h3 id="show-the-ring-of-node"><a href="#show-the-ring-of-node" class="header-anchor">#</a> Show The Ring Of Node</h3> <p>Distributed IoTDB uses consistent hash to support data distribution.</p> <p>You can know each node in the cluster by command <code>ring</code>, which prints node ring information.</p> <p>1.Input</p> <blockquote><p>ring</p></blockquote> <p>2.Output</p> <blockquote><p>The output is a multi-line string, and each line of string is a key value pair, |
| where the key represents the node identifier, and the value represents the node (IP:METAPORT:DATAPORT), the format is <key -> value>.</p></blockquote> <p>3.Examples</p> <blockquote><p>Suppose that the current cluster runs on three nodes: 127.0.0.1:9003:40010, 127.0.0.1:9004:40011, and 127.0.0.1:9005:40012.</p></blockquote> <p>Examples of input instructions for different systems are as follows:</p> <p>Linux and MacOS：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Shell > ./bin/nodetool.sh -h 127.0.0.1 -p 31999 ring |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Windows：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Shell > .\bin\nodetool.bat -h 127.0.0.1 -p 31999 ring |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Press enter to execute the command.</p> <p>The output of the example instruction is as follows:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Node Identifier Node |
| 330411070 -> 127.0.0.1:9003:40010 |
| 330454032 -> 127.0.0.1:9004:40011 |
| 330496472 -> 127.0.0.1:9005:40012 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>The above output shows that there are three nodes in the current cluster, |
| and the output results are ordered by their identifier ascendant.</p> <h3 id="query-data-partition-and-metadata-partition"><a href="#query-data-partition-and-metadata-partition" class="header-anchor">#</a> Query data partition and metadata partition</h3> <p>The time series metadata of distributed iotdb is divided into multiple data groups according to their storage groups, |
| in which the storage group and data partition are many to one relationship.</p> <p>That is, all metadata of a storage group only exists in the same data group, |
| and a data group may contain multiple storage groups.</p> <p>The data is divided into multiple data groups according to its storage group and timestamp, |
| and the time partition granularity is decided by a configuration (currently unavailable).</p> <p>The data partition is composed of several replica nodes to ensure high availability of data, |
| and one of the nodes plays the role of leader.</p> <p>Through this instruction, the user can know the metadata of a certain path, |
| and the nodes under which the data is stored.</p> <p>1.Input</p> <blockquote><p>The instruction for querying data partition information is <code>partition</code>. |
| The parameters are described as follows:</p></blockquote> <table><thead><tr><th>Parameter</th> <th>Description</th> <th>Examples</th></tr></thead> <tbody><tr><td>-m</td> <td>--metadata Query metadata partition, by default only query data partition</td> <td>-m</td></tr> <tr><td>-path</td> <td>--path Required parameter, the path to be queried. If the path has no corresponding storage group, the query fails</td> <td>-path root.guangzhou.d1</td></tr> <tr><td>-st</td> <td>--StartTime The system uses the current partition time by default</td> <td>-st 1576724778159</td></tr> <tr><td>-et</td> <td>--EndTime It is used when querying data partition.<br>The end time is the current system time by default. <br> If the end time is less than the start time, the end time is the start time by default</td> <td>-et 1576724778159</td></tr></tbody></table> <p>2.Output</p> <blockquote><p>The output is a multi-line string, and each line of string is a key-value pair, where the key represents the partition, |
| and the value represents the data group in the format of < key -> value>.</p></blockquote> <p>3.Examples</p> <blockquote><p>Suppose that the current cluster runs on three nodes: 127.0.0.1:9003:40010, 127.0.0.1:9004:40011, and 127.0.0.1:9005:40012.</p> <p>The number of copies is 2 and there are 3 storage groups:{ root.beijing , root.shanghai , root.guangzhou}.</p></blockquote> <ul><li>Partition of query data (default time range, time partition interval is one day)</li></ul> <p>Linux and MacOS：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Shell > ./bin/nodetool.sh -h 127.0.0.1 -p 31999 partition -path root.guangzhou.d1 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Windows：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Shell > .\bin\nodetool.bat -h 127.0.0.1 -p 31999 partition -path root.guangzhou.d1 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Press enter to execute the command.</p> <p>The output of the example instruction is as follows:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>DATA<root.guangzhou.d1, 1576723735188, 1576723735188> -> [127.0.0.1:9003:40010, 127.0.0.1:9004:40011] |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li>Partition of query data (specified time range, time partition interval is one day)</li></ul> <p>Linux and MacOS：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Shell > ./bin/nodetool.sh -h 127.0.0.1 -p 31999 partition -path root.guangzhou.d1 -st 1576624778159 -et 1576724778159 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Windows：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Shell > .\bin\nodetool.bat -h 127.0.0.1 -p 31999 partition -path root.guangzhou.d1 -st 1576624778159 -et 1576724778159 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Press enter to execute the command.</p> <p>The output of the example instruction is as follows:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>DATA<root.guangzhou.d1, 1576627200000, 1576713599999> -> [127.0.0.1:9005:40012, 127.0.0.1:9003:40010] |
| DATA<root.guangzhou.d1, 1576713600000, 1576724778159> -> [127.0.0.1:9003:40010, 127.0.0.1:9004:40011] |
| DATA<root.guangzhou.d1, 1576624778159, 1576627199999> -> [127.0.0.1:9004:40011, 127.0.0.1:9005:40012] |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>Query metadata partition</li></ul> <p>Linux and MacOS：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Shell > ./bin/nodetool.sh -h 127.0.0.1 -p 31999 partition -path root.guangzhou.d1 -m |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Windows：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Shell > .\bin\nodetool.bat -h 127.0.0.1 -p 31999 partition -path root.guangzhou.d1 -m |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Press enter to execute the command.</p> <p>The output of the example instruction is as follows:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>DATA<root.guangzhou.d1, 1576723735188, 1576723735188> -> [127.0.0.1:9003:40010, 127.0.0.1:9004:40011] |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>The above output shows that the data group to which root.guangzhou.d1 belongs contains two nodes, |
| of which 127.0.0.1:9003:40010 is the header node.</p> <h3 id="query-the-number-of-slots-managed-by-the-node"><a href="#query-the-number-of-slots-managed-by-the-node" class="header-anchor">#</a> Query the number of slots managed by the node</h3> <p>Distributed IoTDB divides data into a fixed number of (10000 by default) slots, |
| and the leader of the cluster management group divides the slots among data groups.</p> <p>Through this instruction, you can know the number of slots managed by each data group.</p> <ol><li>Input</li></ol> <blockquote><p>The command to query the data partition information corresponding to the node is <code>host</code>.</p> <p>The parameters are described as follows:</p></blockquote> <table><thead><tr><th>Parameter</th> <th>Description</th> <th>Examples</th></tr></thead> <tbody><tr><td>-a or --all</td> <td>Query the number of slots managed by all data groups. By default only data groups of the query node are shown</td> <td>-a</td></tr></tbody></table> <p>2.Output</p> <blockquote><p>The output is a multi-line string, in which each line is a key-value pair, where the key represents the data group, |
| and the value represents the number of slots managed, and the format is <key -> value>.</p></blockquote> <p>3.Examples</p> <blockquote><p>Suppose that the current cluster runs on three nodes: 127.0.0.1:9003:40010, 127.0.0.1:9004:40011, and 127.0.0.1:9005:40012, |
| and the number of copies is 2.</p></blockquote> <ul><li>Default Partition Group</li></ul> <p>Linux and MacOS：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Shell > ./bin/nodetool.sh -h 127.0.0.1 -p 31999 host |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Windows：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Shell > .\bin\nodetool.bat -h 127.0.0.1 -p 31999 host |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Press enter to execute the command.</p> <p>The output of the example instruction is as follows:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Raft group Slot Number |
| (127.0.0.1:9003:40010, 127.0.0.1:9004:40011) -> 3333 |
| (127.0.0.1:9005:40012, 127.0.0.1:9003:40010) -> 3334 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>All Partition Groups</li></ul> <p>Linux and MacOS：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Shell > ./bin/nodetool.sh -h 127.0.0.1 -p 31999 host -a |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Windows：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Shell > .\bin\nodetool.bat -h 127.0.0.1 -p 31999 host -a |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Press enter to execute the command.</p> <p>The output of the example instruction is as follows:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Raft group Slot Number |
| (127.0.0.1:9003:40010, 127.0.0.1:9004:40011) -> 3333 |
| (127.0.0.1:9004:40011, 127.0.0.1:9005:40012) -> 3333 |
| (127.0.0.1:9005:40012, 127.0.0.1:9003:40010) -> 3334 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h3 id="query-node-status"><a href="#query-node-status" class="header-anchor">#</a> Query node status</h3> <p>Distributed IoTDB contains multiple nodes. |
| For any node, there is a possibility that it cannot provide services normally due to network or hardware problems.</p> <p>Through this instruction, you can know the current status of all nodes in the cluster.</p> <p>1.Input</p> <blockquote><p>status</p></blockquote> <p>2.Output</p> <blockquote><p>The output is a multi-line string, where each line is a key-value pair, where the key represents the node (IP: METAPORT:DATAPORT), |
| the value indicates the status of the node, "on" is normal, "off" is abnormal, and the format is < key -> value>.</p></blockquote> <p>3.Examples</p> <blockquote><p>Suppose that the current cluster runs on three nodes: 127.0.0.1:9003:40010, 127.0.0.1:9004:40011, and 127.0.0.1:9005:40012, |
| and the number of copies is 2.</p></blockquote> <p>Linux and MacOS：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Shell > ./bin/nodetool.sh -h 127.0.0.1 -p 31999 status |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Windows：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Shell > .\bin\nodetool.bat -h 127.0.0.1 -p 31999 status |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Press enter to execute the command.</p> <p>The output of the example instruction is as follows:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>Node Status |
| 127.0.0.1:9003:40010 -> on |
| 127.0.0.1:9005:40012 -> off |
| 127.0.0.1:9004:40011 -> on |
| |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><p>The above output indicates that 127.0.0.1:9003:40010 nodes and 127.0.0.1:9004:40011 nodes are in normal state, |
| and 127.0.0.1:9005:40012 nodes cannot provide services.</p></div> <!----> <p style="text-align: center;">Copyright © 2020 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: #444"> |
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