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Posted to commits@kylin.apache.org by li...@apache.org on 2019/08/01 14:04:53 UTC
svn commit: r1864154 [10/17] - in /kylin/site: ./ blog/ blog/2019/07/30/
blog/2019/07/30/detailed-analysis-of-refine-query-cache/ cn/docs30/
cn/docs30/gettingstarted/ cn/docs30/howto/ cn/docs30/install/
cn/docs30/tutorial/ docs30/ docs30/gettingstarted...
Added: kylin/site/docs30/howto/howto_use_hive_mr_dict.html
URL: http://svn.apache.org/viewvc/kylin/site/docs30/howto/howto_use_hive_mr_dict.html?rev=1864154&view=auto
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--- kylin/site/docs30/howto/howto_use_hive_mr_dict.html (added)
+++ kylin/site/docs30/howto/howto_use_hive_mr_dict.html Thu Aug 1 14:04:52 2019
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+ <h1 class="post-title">Use Hive to build global dictionary</h1>
+
+
+ <article class="post-content" >
+ <h3 id="global-dictionary">Global Dictionary</h3>
+<p>Count distinct measure is very important for many scenario, such as PageView statistics, Kylin support count distinct since 1.5.3 (http://kylin.apache.org/blog/2016/08/01/count-distinct-in-kylin/). <br />
+Apache Kylin implements precisely count distinct based on bitmap, and use global dictionary to encode string value into a Dict. <br />
+Currently we have to build global dictionary in single process/JVM, which may take a lot of time and memory for UHC. By in this feature(KYLIN-3841), we use Hive, a distributed SQL engine to build global dictionary.</p>
+
+<p>This will help to:<br />
+1. Reduce memory pressure of Kylin process, MapReduce will be used to build dict for Kylin<br />
+2. Make global dictionary reusable<br />
+3. Make global dictionary readable, you may use global dictionary outside Kylin, maybe useful in many scenario.</p>
+
+<p>And this feature will add three steps if enabled.<br />
+1. Global Dict Mr/Hive extract dict_val from Data<br />
+2. Global Dict Mr/Hive build dict_val<br />
+3. Global Dict Mr/Hive replace dict_val to Data</p>
+
+<h3 id="how-to-use">How to use</h3>
+<p>If you have a count distinct(bitmap) measure for a UHC. Says columns name are PV_ID and USER_ID, and table name is USER_ACTION, you may add cube-level configuration <code class="highlighter-rouge">kylin.dictionary.mr-hive.columns=USER_ACTION_PV_ID,USER_ACTION_USER_ID</code> to enable this feature.<br />
+You have to know that the value will be replaced into encoded integer in flat hive table, and this may cause failure of some query.</p>
+
+<h3 id="configuration">Configuration</h3>
+<ul>
+ <li><code class="highlighter-rouge">kylin.dictionary.mr-hive.columns</code> is used to specific which columns need to be Hive-MR dict.</li>
+ <li><code class="highlighter-rouge">kylin.dictionary.mr-hive.database</code> is used to specific which database Hive-MR dict located.</li>
+ <li><code class="highlighter-rouge">kylin.hive.union.style</code> Sometime sql which used to build global dict table may have syntax problem. This should be fixed by specific this entry with <em>UNION ALL</em>.</li>
+ <li><code class="highlighter-rouge">kylin.dictionary.mr-hive.table.suffix</code> is used to specific suffix of global dict table.</li>
+</ul>
+
+ </article>
+ </div>
+ </div>
+ </div>
+ <!--
+* Licensed to the Apache Software Foundation (ASF) under one
+* or more contributor license agreements. See the NOTICE file
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+*
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+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
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+
+ <li class="navlist">
+ <a href="/docs30/tutorial/cube_streaming.html" class="list-group-item-lay pjaxlink">Scalable Cubing from Kafka</a>
+ </li>
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+ <li class="navlist">
+ <a href="/docs30/tutorial/realtime_olap.html" class="list-group-item-lay pjaxlink">Real-time OLAP</a>
+ </li>
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+ <li class="navlist">
+ <a href="/docs30/tutorial/cube_build_performance.html" class="list-group-item-lay pjaxlink">Cube Build Tuning</a>
+ </li>
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+ <li class="navlist">
+ <a href="/docs30/tutorial/kylin_client_tool.html" class="list-group-item-lay pjaxlink">Kylin Python Client</a>
+ </li>
+
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+ <li class="navlist">
+ <a href="/docs30/tutorial/setup_systemcube.html" class="list-group-item-lay pjaxlink">Set Up System Cube</a>
+ </li>
+
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+
+ <li class="navlist">
+ <a href="/docs30/tutorial/use_cube_planner.html" class="list-group-item-lay pjaxlink">Use Cube Planner</a>
+ </li>
+
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+
+
+ <li class="navlist">
+ <a href="/docs30/tutorial/use_dashboard.html" class="list-group-item-lay pjaxlink">Use Dashboard</a>
+ </li>
+
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+
+
+ <li class="navlist">
+ <a href="/docs30/tutorial/setup_jdbc_datasource.html" class="list-group-item-lay pjaxlink">Setup JDBC Data Source</a>
+ </li>
+
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+ <li class="navlist">
+ <a href="/docs30/tutorial/hybrid.html" class="list-group-item-lay pjaxlink">Hybrid Model</a>
+ </li>
+
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+
+
+ <li class="navlist">
+ <a href="/docs30/tutorial/mysql_metastore.html" class="list-group-item-lay pjaxlink">Use MySQL as Metastore</a>
+ </li>
+
+
+
+
+
+
+
+
+ <ul>
+ </div>
+</div>
+
+ <li><a href="#titleIntegration" data-toggle="collapse" id="navtitle">Integration</a></li>
+ <div class="collapse in">
+ <div class="list-group" id="list1">
+ <ul>
+
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+
+
+ <li class="navlist">
+ <a href="/docs30/tutorial/odbc.html" class="list-group-item-lay pjaxlink">Kylin ODBC Driver</a>
+ </li>
+
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+
+
+ <li class="navlist">
+ <a href="/docs30/tutorial/jdbc.html" class="list-group-item-lay pjaxlink">Kylin JDBC Driver</a>
+ </li>
+
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+ <li class="navlist">
+ <a href="/docs30/tutorial/tableau.html" class="list-group-item-lay pjaxlink">Tableau 8</a>
+ </li>
+
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+ <li class="navlist">
+ <a href="/docs30/tutorial/tableau_91.html" class="list-group-item-lay pjaxlink">Tableau 9</a>
+ </li>
+
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+ <ul>
+ </div>
+</div>
+
+ <li><a href="#titleHow To" data-toggle="collapse" id="navtitle">How To</a></li>
+ <div class="collapse in">
+ <div class="list-group" id="list1">
+ <ul>
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+ <li class="navlist">
+ <a href="/docs30/howto/howto_use_restapi.html" class="list-group-item-lay pjaxlink">Use RESTful API</a>
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+ <li class="navlist">
+ <a href="/docs30/howto/howto_build_cube_with_restapi.html" class="list-group-item-lay pjaxlink">Build Cube with API</a>
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+ <li class="navlist">
+ <a href="/docs30/howto/howto_optimize_cubes.html" class="list-group-item-lay pjaxlink">Optimize Cube Design</a>
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+ <li class="navlist">
+ <a href="/docs30/howto/howto_optimize_build.html" class="list-group-item-lay pjaxlink">Optimize Cube Build</a>
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+ <li class="navlist">
+ <a href="/docs30/howto/howto_backup_metadata.html" class="list-group-item-lay pjaxlink">Backup Metadata</a>
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+ <li class="navlist">
+ <a href="/docs30/howto/howto_cleanup_storage.html" class="list-group-item-lay pjaxlink">Cleanup Storage</a>
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+ <li class="navlist">
+ <a href="/docs30/howto/howto_upgrade.html" class="list-group-item-lay pjaxlink">Upgrade From Old Versions</a>
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+ <li class="navlist">
+ <a href="/docs30/howto/howto_use_cli.html" class="list-group-item-lay pjaxlink">Use Utility CLIs</a>
+ </li>
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+ <li class="navlist">
+ <a href="/docs30/howto/howto_ldap_and_sso.html" class="list-group-item-lay pjaxlink">Secure with LDAP and SSO</a>
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+ <li class="navlist">
+ <a href="/docs30/howto/howto_use_beeline.html" class="list-group-item-lay pjaxlink">Use Beeline for Hive</a>
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