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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"><span>IoTDB User Guide (V0.8.x)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>0-Get Started</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>1-Overview</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>2-Concept Key Concepts and Terminology</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>3-Operation Manual</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>4-Deployment and Management</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>5-IoTDB SQL Documentation</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>6-JDBC API</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>7-TsFile</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/UserGuide/V0.8.x/7-TsFile/1-Installation.html" class="sidebar-link">Installation</a></li><li><a href="/UserGuide/V0.8.x/7-TsFile/2-Usage.html" class="sidebar-link">Usage</a></li><li><a href="/UserGuide/V0.8.x/7-TsFile/3-Hierarchy.html" aria-current="page" class="active sidebar-link">Hierarchy</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>8-System Tools</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="tsfile-hierarchy"><a href="#tsfile-hierarchy" class="header-anchor">#</a> TsFile Hierarchy</h1> <p>Here is a brief introduction of the structure of a TsFile file.</p> <h1 id="variable-storage"><a href="#variable-storage" class="header-anchor">#</a> Variable Storage</h1> <ul><li><p><strong>Big Endian</strong> |
| </p> <ul><li>For Example, the <code>int</code> <code>0x8</code> will be stored as <code>00 00 00 08</code>, not <code>08 00 00 00</code></li></ul></li> <li><p><strong>String with Variable Length</strong></p> <ul><li><p>The format is <code>int size</code> plus <code>String literal</code>. Size can be zero.</p></li> <li><p>Size equals the number of bytes this string will take, and it may not equal to the length of the string.</p></li> <li><p>For example "sensor_1" will be stored as <code>00 00 00 08</code> plus the encoding(ASCII) of "sensor_1".</p></li> <li><p>Note that for the "Magic String"(file signature) "TsFilev0.8.0", the size(12) and encoding(ASCII) |
| is fixed so there is no need to put the size before this string literal.</p></li></ul></li> <li><p><strong>Data Type Hardcode</strong></p> <ul><li>0: BOOLEAN</li> <li>1: INT32 (<code>int</code>)</li> <li>2: INT64 (<code>long</code>)</li> <li>3: FLOAT</li> <li>4: DOUBLE</li> <li>5: TEXT (<code>String</code>)</li></ul></li> <li><p><strong>Encoding Type Hardcode</strong></p> <ul><li>0: PLAIN</li> <li>1: PLAIN_DICTIONARY</li> <li>2: RLE</li> <li>3: DIFF</li> <li>4: TS_2DIFF</li> <li>5: BITMAP</li> <li>6: GORILLA</li> <li>7: REGULAR</li></ul></li> <li><p><strong>Compressing Type Hardcode</strong></p> <ul><li>0: UNCOMPRESSED</li> <li>1: SNAPPY</li></ul></li></ul> <h1 id="tsfile-overview"><a href="#tsfile-overview" class="header-anchor">#</a> TsFile Overview</h1> <p>Here is a graph about the TsFile structure.</p> <p><img src="https://user-images.githubusercontent.com/40447846/61616997-6fad1300-ac9c-11e9-9c17-46785ebfbc88.png" alt="TsFile Breakdown"></p> <h1 id="magic-string"><a href="#magic-string" class="header-anchor">#</a> Magic String</h1> <p>There is a 12 bytes magic string:</p> <p><code>TsFilev0.8.0</code></p> <p>It is in both the beginning and end of a TsFile file as signature.</p> <h1 id="data"><a href="#data" class="header-anchor">#</a> Data</h1> <p>The content of a TsFile file can be divided as two parts: data and metadata. There is a byte <code>0x02</code> as the marker between |
| data and metadata.</p> <p>The data section is an array of <code>ChunkGroup</code>, each ChuckGroup represents a <em>device</em>.</p> <h3 id="chuckgroup"><a href="#chuckgroup" class="header-anchor">#</a> ChuckGroup</h3> <p>The <code>ChunkGroup</code> has an array of <code>Chunk</code>, a following byte <code>0x00</code> as the marker, and a <code>ChunkFooter</code>.</p> <h4 id="chunk"><a href="#chunk" class="header-anchor">#</a> Chunk</h4> <p>A <code>Chunk</code> represents a <em>sensor</em>. There is a byte <code>0x01</code> as the marker, following a <code>ChunkHeader</code> and an array of <code>Page</code>.</p> <h5 id="chunkheader"><a href="#chunkheader" class="header-anchor">#</a> ChunkHeader</h5> <center><table style="text-align:center;"><tr><th>Member Description</th><th>Member Type</th></tr> <tr><td>The name of this sensor(measurementID)</td><td>String</td></tr> <tr><td>Size of this chunk</td><td>int</td></tr> <tr><td>Data type of this chuck</td><td>short</td></tr> <tr><td>Number of pages</td><td>int</td></tr> <tr><td>Compression Type</td><td>short</td></tr> <tr><td>Encoding Type</td><td>short</td></tr> <tr><td>Max Tombstone Time</td><td>long</td></tr></table></center> <h5 id="page"><a href="#page" class="header-anchor">#</a> Page</h5> <p>A <code>Page</code> represents some data in a <code>Chunk</code>. It contains a <code>PageHeader</code> and the actual data (The encoded time-value pair).</p> <p>PageHeader Structure</p> <center><table style="text-align:center;"><tr><th>Member Description</th><th>Member Type</th></tr> <tr><td>Data size before compressing</td><td>int</td></tr> <tr><td>Data size after compressing(if use SNAPPY)</td><td>int</td></tr> <tr><td>Number of values</td><td>int</td></tr> <tr><td>Minimum time stamp</td><td>long</td></tr> <tr><td>Maximum time stamp</td><td>long</td></tr> <tr><td>Minimum value of the page</td><td>Type of the page</td></tr> <tr><td>Maximum value of the page</td><td>Type of the page</td></tr> <tr><td>First value of the page</td><td>Type of the page</td></tr> <tr><td>Last value of the page</td><td>Type of the page</td></tr> <tr><td>Sum of the Page</td><td>double</td></tr></table></center> <h5 id="chunkgroupfooter"><a href="#chunkgroupfooter" class="header-anchor">#</a> ChunkGroupFooter</h5> <center><table style="text-align:center;"><tr><th>Member Description</th><th>Member Type</th></tr> <tr><td>Deviceid</td><td>String</td></tr> <tr><td>Data size of the ChunkGroup</td><td>long</td></tr> <tr><td>Number of chunks</td><td>int</td></tr></table></center> <h1 id="metadata"><a href="#metadata" class="header-anchor">#</a> Metadata</h1> <h2 id="tsdevicemetadata"><a href="#tsdevicemetadata" class="header-anchor">#</a> TsDeviceMetaData</h2> <p>The first part of metadata is <code>TsDeviceMetaData</code></p> <center><table style="text-align:center;"><tr><th>Member Description</th><th>Member Type</th></tr> <tr><td>Start time</td><td>long</td></tr> <tr><td>End time</td><td>long</td></tr> <tr><td>Number of chunk groups</td><td>int</td></tr></table></center> <p>Then there is an array of <code>ChunkGroupMetaData</code> after <code>TsDeviceMetaData</code></p> <h2 id="chunkgroupmetadata"><a href="#chunkgroupmetadata" class="header-anchor">#</a> ChunkGroupMetaData</h2> <center><table style="text-align:center;"><tr><th>Member Description</th><th>Member Type</th></tr> <tr><td>Deviceid</td><td>String</td></tr> <tr><td>Start offset of the ChunkGroup</td><td>long</td></tr> <tr><td>End offset of the ChunkGroup</td><td>long</td></tr> <tr><td>Version</td><td>long</td></tr> <tr><td>Number of ChunkMetaData</td><td>int</td></tr></table></center> <p>Then there is an array of <code>ChunkMetadata</code> for each <code>ChunkGroupMetadata</code></p> <h4 id="chunkmetadata"><a href="#chunkmetadata" class="header-anchor">#</a> ChunkMetaData</h4> <center><table style="text-align:center;"><tr><th>Member Description</th><th>Member Type</th></tr> <tr><td>Measurementid</td><td>String</td></tr> <tr><td>Start offset of ChunkHeader</td><td>long</td></tr> <tr><td>Number of data points</td><td>long</td></tr> <tr><td>Start time</td><td>long</td></tr> <tr><td>End time</td><td>long</td></tr> <tr><td>Data type</td><td>short</td></tr> <tr><td>Number of statistics</td><td>int</td></tr> <tr><td>The statistics of this chunk</td><td>TsDigest</td></tr></table></center> <h5 id="tsdigest"><a href="#tsdigest" class="header-anchor">#</a> TsDigest</h5> <p>There are five statistics: <code>min, last, sum, first, max</code></p> <p>The storage format is a name-value pair. The name is a string (remember the length is before the literal).</p> <p>But for the value, there is also a size integer before the data even if it is not string. For example, if the <code>min</code> is 3, then it will be |
| stored as 3 "min" 4 3 in the TsFile.</p> <h3 id="file-metadata"><a href="#file-metadata" class="header-anchor">#</a> File Metadata</h3> <p>After the array of <code>ChunkGroupMetadata</code>, here is the last part of the metadata.</p> <center><table style="text-align:center;"><tr><th>Member Description</th><th>Member Type</th></tr> <tr><td>Number of Devices</td><td>int</td></tr> <tr><td>Array of DeviceIndexMetadata</td><td>DeviceIndexMetadata</td></tr> <tr><td>Number of Measurements</td><td>int</td></tr> <tr><td>Array of Measurement name and schema</td><td>String, MeasurementSchema pair</td></tr> <tr><td>Current Version(3 for now)</td><td>int</td></tr> <tr><td>Author byte</td><td>byte</td></tr> <tr><td>Author(if author byte is 0x01)</td><td>String</td></tr> <tr><td>File Metadata size(not including itself)</td><td>int</td></tr></table></center> <h4 id="deviceindexmetadata"><a href="#deviceindexmetadata" class="header-anchor">#</a> DeviceIndexMetadata</h4> <center><table style="text-align:center;"><tr><th>Member Description</th><th>Member Type</th></tr> <tr><td>Deviceid</td><td>String</td></tr> <tr><td>Start offset of ChunkGroupMetaData(Or TsDeviceMetaData if it's the first one)</td><td>long</td></tr> <tr><td>length</td><td>int</td></tr> <tr><td>Start time</td><td>long</td></tr> <tr><td>End time</td><td>long</td></tr></table></center> <h4 id="measurementschema"><a href="#measurementschema" class="header-anchor">#</a> MeasurementSchema</h4> <center><table style="text-align:center;"><tr><th>Member Description</th><th>Member Type</th></tr> <tr><td>Measurementid</td><td>String</td></tr> <tr><td>Data type</td><td>short</td></tr> <tr><td>Encoding</td><td>short</td></tr> <tr><td>Compressor</td><td>short</td></tr> <tr><td>Size of props</td><td>int</td></tr></table></center> <p>If size of props is greater than 0, there is an array of <String, String> pair as properties of this measurement.</p> <p>Such as "max_point_number""2".</p> <h1 id="done"><a href="#done" class="header-anchor">#</a> Done</h1> <p>After the <code>FileMetaData</code>, there will be another Magic String and you have finished the journey of discovering TsFile!</p> <p>You can also use /tsfile/example/TsFileSequenceRead to read and validate a TsFile.</p></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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