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class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/0.16.0-incubating/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/0.16.0-incubating/tutorials/index.html">Quickstart</a></li><li class="navListItem"><a class="navItem" href="/docs/0.16.0-incubating/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/0.16.0-incubating/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Tutorials<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path 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href="/docs/0.16.0-incubating/comparisons/druid-vs-key-value.html">Apache Druid vs. Key/Value Stores (HBase/Cassandra/OpenTSDB)</a></li><li class="navListItem"><a class="navItem" href="/docs/0.16.0-incubating/comparisons/druid-vs-kudu.html">Apache Druid vs Kudu</a></li><li class="navListItem"><a class="navItem" href="/docs/0.16.0-incubating/comparisons/druid-vs-redshift.html">Apache Druid vs Redshift</a></li><li class="navListItem"><a class="navItem" href="/docs/0.16.0-incubating/comparisons/druid-vs-spark.html">Apache Druid vs Spark</a></li><li class="navListItem"><a class="navItem" href="/docs/0.16.0-incubating/comparisons/druid-vs-sql-on-hadoop.html">Apache Druid vs SQL-on-Hadoop</a></li><li class="navListItem"><a class="navItem" href="/docs/0.16.0-incubating/design/auth.html">Authentication and Authorization</a></li><li class="navListItem"><a class="navItem" href="/docs/0.16.0-incubating/design/broker.html">Broker</a></li><li class="navListItem"><a class="navItem" 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| </script></nav></div><div class="container mainContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/incubator-druid/edit/master/docs/tutorials/tutorial-update-data.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 class="postHeaderTitle">Tutorial: Updating existing data</h1></header><article><div><span><!-- |
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| <p>This tutorial demonstrates how to update existing data, showing both overwrites and appends.</p> |
| <p>For this tutorial, we'll assume you've already downloaded Apache Druid (incubating) as described in |
| the <a href="index.html">single-machine quickstart</a> and have it running on your local machine.</p> |
| <p>It will also be helpful to have finished <a href="/docs/0.16.0-incubating/tutorials/tutorial-batch.html">Tutorial: Loading a file</a>, <a href="/docs/0.16.0-incubating/tutorials/tutorial-query.html">Tutorial: Querying data</a>, and <a href="/docs/0.16.0-incubating/tutorials/tutorial-rollup.html">Tutorial: Rollup</a>.</p> |
| <h2><a class="anchor" aria-hidden="true" id="overwrite"></a><a href="#overwrite" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overwrite</h2> |
| <p>This section of the tutorial will cover how to overwrite an existing interval of data.</p> |
| <h3><a class="anchor" aria-hidden="true" id="load-initial-data"></a><a href="#load-initial-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Load initial data</h3> |
| <p>Let's load an initial data set which we will overwrite and append to.</p> |
| <p>The spec we'll use for this tutorial is located at <code>quickstart/tutorial/updates-init-index.json</code>. This spec creates a datasource called <code>updates-tutorial</code> from the <code>quickstart/tutorial/updates-data.json</code> input file.</p> |
| <p>Let's submit that task:</p> |
| <pre><code class="hljs css language-bash">bin/post-index-task --file quickstart/tutorial/updates-init-index.json --url http://localhost:8081 |
| </code></pre> |
| <p>We have three initial rows containing an "animal" dimension and "number" metric:</p> |
| <pre><code class="hljs css language-bash">dsql> select * from <span class="hljs-string">"updates-tutorial"</span>; |
| ┌──────────────────────────┬──────────┬───────┬────────┐ |
| │ __time │ animal │ count │ number │ |
| ├──────────────────────────┼──────────┼───────┼────────┤ |
| │ 2018-01-01T01:01:00.000Z │ tiger │ 1 │ 100 │ |
| │ 2018-01-01T03:01:00.000Z │ aardvark │ 1 │ 42 │ |
| │ 2018-01-01T03:01:00.000Z │ giraffe │ 1 │ 14124 │ |
| └──────────────────────────┴──────────┴───────┴────────┘ |
| Retrieved 3 rows <span class="hljs-keyword">in</span> 1.42s. |
| </code></pre> |
| <h3><a class="anchor" aria-hidden="true" id="overwrite-the-initial-data"></a><a href="#overwrite-the-initial-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overwrite the initial data</h3> |
| <p>To overwrite this data, we can submit another task for the same interval, but with different input data.</p> |
| <p>The <code>quickstart/tutorial/updates-overwrite-index.json</code> spec will perform an overwrite on the <code>updates-tutorial</code> datasource.</p> |
| <p>Note that this task reads input from <code>quickstart/tutorial/updates-data2.json</code>, and <code>appendToExisting</code> is set to <code>false</code> (indicating this is an overwrite).</p> |
| <p>Let's submit that task:</p> |
| <pre><code class="hljs css language-bash">bin/post-index-task --file quickstart/tutorial/updates-overwrite-index.json --url http://localhost:8081 |
| </code></pre> |
| <p>When Druid finishes loading the new segment from this overwrite task, the "tiger" row now has the value "lion", the "aardvark" row has a different number, and the "giraffe" row has been replaced. It may take a couple of minutes for the changes to take effect:</p> |
| <pre><code class="hljs css language-bash">dsql> select * from <span class="hljs-string">"updates-tutorial"</span>; |
| ┌──────────────────────────┬──────────┬───────┬────────┐ |
| │ __time │ animal │ count │ number │ |
| ├──────────────────────────┼──────────┼───────┼────────┤ |
| │ 2018-01-01T01:01:00.000Z │ lion │ 1 │ 100 │ |
| │ 2018-01-01T03:01:00.000Z │ aardvark │ 1 │ 9999 │ |
| │ 2018-01-01T04:01:00.000Z │ bear │ 1 │ 111 │ |
| └──────────────────────────┴──────────┴───────┴────────┘ |
| Retrieved 3 rows <span class="hljs-keyword">in</span> 0.02s. |
| </code></pre> |
| <h2><a class="anchor" aria-hidden="true" id="combine-old-data-with-new-data-and-overwrite"></a><a href="#combine-old-data-with-new-data-and-overwrite" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Combine old data with new data and overwrite</h2> |
| <p>Let's try appending some new data to the <code>updates-tutorial</code> datasource now. We will add the data from <code>quickstart/tutorial/updates-data3.json</code>.</p> |
| <p>The <code>quickstart/tutorial/updates-append-index.json</code> task spec has been configured to read from the existing <code>updates-tutorial</code> datasource and the <code>quickstart/tutorial/updates-data3.json</code> file. The task will combine data from the two input sources, and then overwrite the original data with the new combined data.</p> |
| <p>Let's submit that task:</p> |
| <pre><code class="hljs css language-bash">bin/post-index-task --file quickstart/tutorial/updates-append-index.json --url http://localhost:8081 |
| </code></pre> |
| <p>When Druid finishes loading the new segment from this overwrite task, the new rows will have been added to the datasource. Note that roll-up occurred for the "lion" row:</p> |
| <pre><code class="hljs css language-bash">dsql> select * from <span class="hljs-string">"updates-tutorial"</span>; |
| ┌──────────────────────────┬──────────┬───────┬────────┐ |
| │ __time │ animal │ count │ number │ |
| ├──────────────────────────┼──────────┼───────┼────────┤ |
| │ 2018-01-01T01:01:00.000Z │ lion │ 2 │ 400 │ |
| │ 2018-01-01T03:01:00.000Z │ aardvark │ 1 │ 9999 │ |
| │ 2018-01-01T04:01:00.000Z │ bear │ 1 │ 111 │ |
| │ 2018-01-01T05:01:00.000Z │ mongoose │ 1 │ 737 │ |
| │ 2018-01-01T06:01:00.000Z │ snake │ 1 │ 1234 │ |
| │ 2018-01-01T07:01:00.000Z │ octopus │ 1 │ 115 │ |
| └──────────────────────────┴──────────┴───────┴────────┘ |
| Retrieved 6 rows <span class="hljs-keyword">in</span> 0.02s. |
| </code></pre> |
| <h2><a class="anchor" aria-hidden="true" id="append-to-the-data"></a><a href="#append-to-the-data" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Append to the data</h2> |
| <p>Let's try another way of appending data.</p> |
| <p>The <code>quickstart/tutorial/updates-append-index2.json</code> task spec reads input from <code>quickstart/tutorial/updates-data4.json</code> and will append its data to the <code>updates-tutorial</code> datasource. Note that <code>appendToExisting</code> is set to <code>true</code> in this spec.</p> |
| <p>Let's submit that task:</p> |
| <pre><code class="hljs css language-bash">bin/post-index-task --file quickstart/tutorial/updates-append-index2.json --url http://localhost:8081 |
| </code></pre> |
| <p>When the new data is loaded, we can see two additional rows after "octopus". Note that the new "bear" row with number 222 has not been rolled up with the existing bear-111 row, because the new data is held in a separate segment.</p> |
| <pre><code class="hljs css language-bash">dsql> select * from <span class="hljs-string">"updates-tutorial"</span>; |
| ┌──────────────────────────┬──────────┬───────┬────────┐ |
| │ __time │ animal │ count │ number │ |
| ├──────────────────────────┼──────────┼───────┼────────┤ |
| │ 2018-01-01T01:01:00.000Z │ lion │ 2 │ 400 │ |
| │ 2018-01-01T03:01:00.000Z │ aardvark │ 1 │ 9999 │ |
| │ 2018-01-01T04:01:00.000Z │ bear │ 1 │ 111 │ |
| │ 2018-01-01T05:01:00.000Z │ mongoose │ 1 │ 737 │ |
| │ 2018-01-01T06:01:00.000Z │ snake │ 1 │ 1234 │ |
| │ 2018-01-01T07:01:00.000Z │ octopus │ 1 │ 115 │ |
| │ 2018-01-01T04:01:00.000Z │ bear │ 1 │ 222 │ |
| │ 2018-01-01T09:01:00.000Z │ falcon │ 1 │ 1241 │ |
| └──────────────────────────┴──────────┴───────┴────────┘ |
| Retrieved 8 rows <span class="hljs-keyword">in</span> 0.02s. |
| |
| </code></pre> |
| <p>If we run a GroupBy query instead of a <code>select *</code>, we can see that the "bear" rows will group together at query time:</p> |
| <pre><code class="hljs css language-bash">dsql> select __time, animal, SUM(<span class="hljs-string">"count"</span>), SUM(<span class="hljs-string">"number"</span>) from <span class="hljs-string">"updates-tutorial"</span> group by __time, animal; |
| ┌──────────────────────────┬──────────┬────────┬────────┐ |
| │ __time │ animal │ EXPR<span class="hljs-variable">$2</span> │ EXPR<span class="hljs-variable">$3</span> │ |
| ├──────────────────────────┼──────────┼────────┼────────┤ |
| │ 2018-01-01T01:01:00.000Z │ lion │ 2 │ 400 │ |
| │ 2018-01-01T03:01:00.000Z │ aardvark │ 1 │ 9999 │ |
| │ 2018-01-01T04:01:00.000Z │ bear │ 2 │ 333 │ |
| │ 2018-01-01T05:01:00.000Z │ mongoose │ 1 │ 737 │ |
| │ 2018-01-01T06:01:00.000Z │ snake │ 1 │ 1234 │ |
| │ 2018-01-01T07:01:00.000Z │ octopus │ 1 │ 115 │ |
| │ 2018-01-01T09:01:00.000Z │ falcon │ 1 │ 1241 │ |
| └──────────────────────────┴──────────┴────────┴────────┘ |
| Retrieved 7 rows <span class="hljs-keyword">in</span> 0.23s. |
| </code></pre> |
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