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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>System design</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>TsFile</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>QueryEngine</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>SchemaManager</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>StorageEngine</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/SystemDesign/StorageEngine/StorageEngine.html" class="sidebar-link">StorageEngine</a></li><li><a href="/SystemDesign/StorageEngine/WAL.html" class="sidebar-link">WAL</a></li><li><a href="/SystemDesign/StorageEngine/FlushManager.html" class="sidebar-link">FlushManager</a></li><li><a href="/SystemDesign/StorageEngine/MergeManager.html" class="sidebar-link">MergeManager</a></li><li><a href="/SystemDesign/StorageEngine/DataPartition.html" class="sidebar-link">DataPartition</a></li><li><a href="/SystemDesign/StorageEngine/DataManipulation.html" aria-current="page" class="active sidebar-link">DataManipulation</a></li><li><a href="/SystemDesign/StorageEngine/Recover.html" class="sidebar-link">Recover</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>DataQuery</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Tools</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Connector</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></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="data-addition-deletion-and-modification"><a href="#data-addition-deletion-and-modification" class="header-anchor">#</a> Data addition, deletion and modification</h1> <p>The following describes four common data manipulation operations, which are insert, update, delete, and TTL settings.</p> <h2 id="data-insertion"><a href="#data-insertion" class="header-anchor">#</a> Data insertion</h2> <h3 id="write-a-single-line-of-data-one-device-one-timestamp-multiple-values"><a href="#write-a-single-line-of-data-one-device-one-timestamp-multiple-values" class="header-anchor">#</a> Write a single line of data (one device, one timestamp, multiple values)</h3> <ul><li>Corresponding interface |
| <ul><li>JDBC's execute and executeBatch interfaces</li> <li>Session's insertRecord and insertRecords</li></ul></li> <li>Main entrance: <code>public void insert(InsertRowPlan insertRowPlan)</code> StorageEngine.java |
| <ul><li>Find the corresponding StorageGroupProcessor</li> <li>Find the corresponding TsFileProcessor according to the time of writing the data and the last time stamp of the current device order</li> <li>Write to the corresponding memtable of TsFileProcessor |
| <ul><li>If the file is out of order, update the endTimeMap in tsfileResource</li> <li>If there is no information about the device in tsfile, or the time of inserted data newly is less than startTime stored, then update the startTimeMap in tsfileResource</li></ul></li> <li>Pre-write log</li> <li>Determine whether to trigger asynchronous persistent memtable operation based on memtable size |
| <ul><li>If it is a sequential file and the flashing action is performed, the endTimeMap in tsfileResource is updated</li></ul></li> <li>Determine whether to trigger a file close operation based on the size of the current disk TsFile</li></ul></li></ul> <h3 id="batch-data-multiple-timestamp-multiple-values-for-one-device-write"><a href="#batch-data-multiple-timestamp-multiple-values-for-one-device-write" class="header-anchor">#</a> Batch data (multiple timestamp multiple values for one device) write</h3> <ul><li><p>Corresponding interface</p> <ul><li>Session‘s insertTablet</li></ul></li> <li><p>Main entrance: <code>public void insertTablet(InsertTabletPlan insertTabletPlan)</code> StorageEngine.java</p> <ul><li>Find the corresponding StorageGroupProcessor</li> <li>According to the time of this batch of data and the last timestamp of the current device order, this batch of data is divided into small batches, which correspond to a TsFileProcessor</li> <li>Write each small batch to the corresponding memtable of TsFileProcessor |
| <ul><li>If the file is out of order, update the endTimeMap in tsfileResource</li> <li>If there is no information about the device in tsfile, or the time of inserted data newly is less than startTime stored, then update the startTimeMap in tsfileResource</li></ul></li> <li>Pre-write log</li> <li>Determine whether to trigger asynchronous persistent memtable operation based on memtable size |
| <ul><li>If it is a sequential file and the flashing action is performed, the endTimeMap in tsfileResource is updated</li></ul></li> <li>Determine whether to trigger a file close operation based on the size of the current disk TsFile</li></ul></li></ul> <h2 id="data-update"><a href="#data-update" class="header-anchor">#</a> Data Update</h2> <p>Currently does not support data in-place update operations, that is, update statements, but users can directly insert new data, the same time series at the same time point is based on the latest inserted data. |
| Old data is automatically deleted by merging, see:</p> <ul><li><a href="/SystemDesign/StorageEngine/MergeManager.html">File merge mechanism</a></li></ul> <h2 id="data-deletion"><a href="#data-deletion" class="header-anchor">#</a> Data deletion</h2> <ul><li>Corresponding interface |
| <ul><li>JDBC's execute interface, using delete SQL statements</li></ul></li></ul> <p>Each StorageGroupProcessor maintains a ascending version for each partition, which is managed by SimpleFileVersionController. |
| Each memtable will apply a version when submitted to flush. After flushing to TsFile, a current position-version will added to TsFileMetadata. |
| This information will be used to set version to ChunkMetadata when query.</p> <p>Main entrance in StorageEngine.java:</p> <p><code>public void delete(String deviceId, String measurementId, long startTime, long endTime)</code></p> <ul><li>Find the corresponding StorageGroupProcessor</li> <li>Find all impacted working TsFileProcessors to write WAL</li> <li>Find all impacted TsFileResources to record a Modification in its mods file, the Modification format is: path，version, startTime, endTime</li> <li>If the TsFile is not closed，get its TsFileProcessor |
| <ul><li>If there exists the working memtable, delete data in it</li> <li>If there exists flushing memtable，record the deleted start time and end time in it for query.（Notice that the Modification is recorded in mods for these memtables）</li></ul></li></ul> <p>The Mods file stores records of delete information. |
| For the following mods file, data of d1.s1 falls in range [100, 200], [180, 300], and data of d1.s2 falls in range [500, 1000] are deleted. |
| <img src="https://user-images.githubusercontent.com/59866276/88248546-20952600-ccd4-11ea-88e9-84af8dde4304.jpg" alt=""></p> <h2 id="data-ttl-setting"><a href="#data-ttl-setting" class="header-anchor">#</a> Data TTL setting</h2> <ul><li><p>Corresponding interface</p> <ul><li>JDBC's execute interface, using the SET TTL statement</li></ul></li> <li><p>Main entrance: <code>public void setTTL(String storageGroup, long dataTTL)</code>StorageEngine.java</p> <ul><li>Find the corresponding StorageGroupProcessor</li> <li>Set new data ttl in StorageGroupProcessor</li> <li>TTL check on all TsfileResource</li> <li>If a file expires under the current TTL, delete the file</li></ul></li></ul> <p>At the same time, we started a thread to periodically check the file TTL in StorageEngine.</p> <ul><li>start method in src/main/java/org/apache/iotdb/db/engine/StorageEngine.java</li></ul></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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