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+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_upgrade.html" class="list-group-item-lay pjaxlink" id="navlist">Upgrade From Old Versions</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_ldap_and_sso.html" class="list-group-item-lay pjaxlink" id="navlist">Secure with LDAP and SSO</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_use_beeline.html" class="list-group-item-lay pjaxlink" id="navlist">Use Beeline for Hive</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_update_coprocessor.html" class="list-group-item-lay pjaxlink" id="navlist">Update Coprocessor</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_install_ranger_kylin_plugin.html" class="list-group-item-lay pjaxlink" id="navlist">The Ranger Kylin Plugin Installation Guide</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_enable_zookeeper_acl.html" class="list-group-item-lay pjaxlink" id="navlist">Enable zookeeper acl</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_setup_systemcube.html" class="list-group-item-lay pjaxlink" id="navlist">Set Up System Cube</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_use_cube_planner.html" class="list-group-item-lay pjaxlink" id="navlist">Use Cube Planner</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_use_dashboard.html" class="list-group-item-lay pjaxlink" id="navlist">Use Dashboard</a></li> + + + + + + + + + <ul> + </div> +</div> + + + </ul> +</div> + + <div class="col-md-9 col-lg-9 col-xs-14 aside2"> + <div id="container"> + <div id="pjax"> + <h1 class="post-title">Events and Conferences</h1> + + + <article class="post-content" > + <p><strong>Conferences</strong></p> + +<ul> + <li><a href="https://www.youtube.com/watch?v=n74zvLmIgF0";>The Evolution of Apache Kylin: Realtime and Plugin Architecture in Kylin</a>(<a href="http://www.slideshare.net/YangLi43/apache-kylin-15-updates";>slides</a>) by <a href="https://github.com/liyang-gmt8";>Li Yang</a>, at <a href="http://hadoopsummit.org/dublin/agenda/";>Hadoop Summit 2016 Dublin</a>, Ireland, 2016-04-14</li> + <li><a href="http://www.chinahadoop.com/2015/July/Shanghai/agenda.php";>Apache Kylin - Balance Between Space and Time</a> (<a href="http://www.slideshare.net/qhzhou/apache-kylin-china-hadoop-summit-2015-shanghai";>slides</a>) by <a href="https://github.com/qhzhou";>Qianhao Zhou</a>, at Hadoop Summit 2015 in Shanghai, China, 2015-07-24</li> + <li><a href="https://www.youtube.com/watch?v=jgvZSFaXPgI";>Apache Kylin - Balance Between Space and Time</a>, <a href="http://www.slideshare.net/DebashisSaha/apache-kylin-balance-between-space-and-time-hadop-summit-2015";>slides</a> (<a href="https://www.youtube.com/watch?v=jgvZSFaXPgI";>video</a>, <a href="http://www.slideshare.net/DebashisSaha/apache-kylin-balance-between-space-and-time-hadop-summit-2015";>slides</a>) by <a href="https://twitter.com/debashis_saha";>Debashis Saha</a> & <a href="https://twitter.com/lukehq";>Luke Han</a>, at Hadoop Summit 2015 in San Jose, US, 2015-06-09</li> + <li><a href="https://vimeo.com/128152444";>HBaseCon 2015: Apache Kylin; Extreme OLAP Engine for Hadoop</a> (<a href="https://vimeo.com/128152444";>video</a>, <a href="http://www.slideshare.net/HBaseCon/ecosystem-session-3b";>slides</a>) by <a href="https://twitter.com/SeshuAd";>Seshu Adunuthula</a> at HBaseCon 2015 in San Francisco, US, 2015-05-07</li> + <li><a href="http://strataconf.com/big-data-conference-uk-2015/public/schedule/detail/40029";>Apache Kylin - Extreme OLAP Engine for Hadoop</a> (<a href="http://www.slideshare.net/lukehan/apache-kylin-extreme-olap-engine-for-big-data";>slides</a>) by <a href="https://twitter.com/lukehq";>Luke Han</a> & <a href="https://github.com/liyang-gmt8";>Yang Li</a>, at Strata+Hadoop World in London, UK, 2015-05-06</li> + <li><a href="http://www.infoq.com/cn/presentations/open-source-journey-of-apache-kylin";>Apache Kylin Open Source Journey</a> (<a href="http://www.slideshare.net/lukehan/apache-kylin-open-source-journey-for-qcon2015-beijing";>slides</a>) by <a href="https://twitter.com/lukehq";>Luke Han</a>, at QCon Beijing in Beijing, China, 2015-04-23</li> + <li><a href="http://cio.it168.com/a2015/0418/1721/000001721404.shtml";>Apache Kylin - OLAP on Hadoop</a> by <a href="https://github.com/liyang-gmt8";>Yang Li</a>, at Database Technology Conference China 2015 in Beijing, China, 2015-04-18</li> + <li><a href="https://www.youtube.com/watch?v=U0SbrVzuOe4";>Apache Kylin â Cubes on Hadoop</a> (<a href="https://www.youtube.com/watch?v=U0SbrVzuOe4";>video</a>, <a href="http://www.slideshare.net/Hadoop_Summit/apache-kylin-cubes-on-hadoop";>slides</a>) by <a href="https://twitter.com/ted_dunning";>Ted Dunning</a>, at Hadoop Summit 2015 Europe in Brussels, Belgium, 2015-04-16</li> + <li><a href="http://bdtc2014.hadooper.cn/m/zone/bdtc_2014/schedule3";>Apache Kylin ï¼ Hadoop ä¸ç大è§æ¨¡èæºåæå¹³å°</a> (<a href="http://www.slideshare.net/lukehan/apache-kylin-big-data-technology-conference-2014-beijing-v2";>slides</a>) by <a href="https://twitter.com/lukehq";>Luke Han</a>, at Big Data Technology Conference China in Beijing, China, 2014-12-14</li> + <li><a href="http://v.csdn.hudong.com/s/article.html?arcid=15820707";>Apache Kylin: OLAP Engine on Hadoop - Tech Deep Dive</a> (<a href="http://v.csdn.hudong.com/s/article.html?arcid=15820707";>video</a>, <a href="http://www.slideshare.net/XuJiang2/kylin-hadoop-olap-engine";>slides</a>) by <a href="https://www.linkedin.com/pub/xu-jiang/4/5a8/230";>Jiang Xu</a>, at Shanghai Big Data Summit 2014 in Shanghai, China , 2014-10-25</li> +</ul> + +<p><strong>Meetup</strong></p> + +<ul> + <li><a href="http://www.meetup.com/Cloud-at-ebayinc/events/218914395/";>Apache Kylin Meetup @Bay Area</a>, in San Jose, US, 6:00PM - 7:30PM, Thursday, 2014-12-04</li> +</ul> + + + </article> + </div> + </div> + </div> + </div> + </div> + <!-- +* Licensed to the Apache Software Foundation (ASF) under one +* or more contributor license agreements. 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class="list-group-item-lay pjaxlink" id="navlist">Tableau 9</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/tutorial/powerbi.html" class="list-group-item-lay pjaxlink" id="navlist">MS Excel and Power BI</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/tutorial/microstrategy.html" class="list-group-item-lay pjaxlink" id="navlist">MicroStrategy</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + 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+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_upgrade.html" class="list-group-item-lay pjaxlink" id="navlist">Upgrade From Old Versions</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_ldap_and_sso.html" class="list-group-item-lay pjaxlink" id="navlist">Secure with LDAP and SSO</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_use_beeline.html" class="list-group-item-lay pjaxlink" id="navlist">Use Beeline for Hive</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_update_coprocessor.html" class="list-group-item-lay pjaxlink" id="navlist">Update Coprocessor</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_install_ranger_kylin_plugin.html" class="list-group-item-lay pjaxlink" id="navlist">The Ranger Kylin Plugin Installation Guide</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_enable_zookeeper_acl.html" class="list-group-item-lay pjaxlink" id="navlist">Enable zookeeper acl</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_setup_systemcube.html" class="list-group-item-lay pjaxlink" id="navlist">Set Up System Cube</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_use_cube_planner.html" class="list-group-item-lay pjaxlink" id="navlist">Use Cube Planner</a></li> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + <li><a href="/docs23/howto/howto_use_dashboard.html" class="list-group-item-lay pjaxlink" id="navlist">Use Dashboard</a></li> + + + + + + + + + <ul> + </div> +</div> + + + </ul> +</div> + + <div class="col-md-9 col-lg-9 col-xs-14 aside2"> + <div id="container"> + <div id="pjax"> + <h1 class="post-title">FAQ</h1> + + + <article class="post-content" > + <h4 id="binfind-hive-dependencysh-can-locate-hivehcat-jars-in-local-but-kylin-reports-error-like-javalangnoclassdeffounderror-orgapachehivehcatalogmapreducehcatinputformat-or-javalangnoclassdeffounderror-orgapachehadoophiveqlsessionsessionstate">1. âbin/find-hive-dependency.shâ can locate hive/hcat jars in local, but Kylin reports error like âjava.lang.NoClassDefFoundError: org/apache/hive/hcatalog/mapreduce/HCatInputFormatâ or âjava.lang.NoClassDefFoundError: org/apache/hadoop/hive/ql/session/SessionStateâ</h4> + +<ul> + <li> + <p>Kylin need many dependent jars (hadoop/hive/hcat/hbase/kafka) on classpath to work, but Kylin doesnât ship them. It will seek these jars from your local machine by running commands like <code class="highlighter-rouge">hbase classpath</code>, <code class="highlighter-rouge">hive -e set</code> etc. The founded jarsâ path will be appended to the environment variable <em>HBASE_CLASSPATH</em> (Kylin uses <code class="highlighter-rouge">hbase</code> shell command to start up, which will read this). But in some Hadoop distribution (like AWS EMR 5.0), the <code class="highlighter-rouge">hbase</code> shell doesnât keep the origin <code class="highlighter-rouge">HBASE_CLASSPATH</code> value, that causes the âNoClassDefFoundErrorâ.</p> + </li> + <li> + <p>To fix this, find the hbase shell script (in hbase/bin folder), and search <em>HBASE_CLASSPATH</em>, check whether it overwrite the value like :</p> + </li> +</ul> + +<div class="highlight"><pre><code class="language-groff" data-lang="groff">export HBASE_CLASSPATH=$HADOOP_CONF:$HADOOP_HOME/*:$HADOOP_HOME/lib/*:$ZOOKEEPER_HOME/*:$ZOOKEEPER_HOME/lib/*</code></pre></div> + +<ul> + <li>If true, change it to keep the origin value like:</li> +</ul> + +<div class="highlight"><pre><code class="language-groff" data-lang="groff">export HBASE_CLASSPATH=$HADOOP_CONF:$HADOOP_HOME/*:$HADOOP_HOME/lib/*:$ZOOKEEPER_HOME/*:$ZOOKEEPER_HOME/lib/*:$HBASE_CLASSPATH</code></pre></div> + +<h4 id="get-javalangillegalargumentexception-too-high-cardinality-is-not-suitable-for-dictionary----cardinality-5220674-in-build-dimension-dictionary-step">2. Get âjava.lang.IllegalArgumentException: Too high cardinality is not suitable for dictionary â cardinality: 5220674â in âBuild Dimension Dictionaryâ step</h4> + +<ul> + <li>Kylin uses âDictionaryâ encoding to encode/decode the dimension values (check <a href="/blog/2015/08/13/kylin-dictionary/">this blog</a>); Usually a dimensionâs cardinality is less than millions, so the âDictâ encoding is good to use. As dictionary need be persisted and loaded into memory, if a dimensionâs cardinality is very high, the memory footprint will be tremendous, so Kylin add a check on this. If you see this error, suggest to identify the UHC dimension first and then re-evaluate the design (whether need to make that as dimension?). If must keep it, you can by-pass this error with couple ways: 1) change to use other encoding (like <code class="highlighter-rouge">fixed_length</code>, <code class="highlighter-rouge">integer</code>) 2) or set a bigger value for <code class="highlighter-rouge">kylin.dictionary.max.cardinality</code> in <code class="highlighter-rouge">conf/kylin.properties</code>.</li> +</ul> + +<h4 id="build-cube-failed-due-to-error-check-status">3. Build cube failed due to âerror check statusâ</h4> + +<ul> + <li>Check if <code class="highlighter-rouge">kylin.log</code> contains <em>yarn.resourcemanager.webapp.address:http://0.0.0.0:8088</em> and <em>java.net.ConnectException: Connection refused</em></li> + <li>If yes, then the problem is the address of resource manager was not available in yarn-site.xml</li> + <li>A workaround is update <code class="highlighter-rouge">kylin.properties</code>, set <code class="highlighter-rouge">kylin.job.yarn.app.rest.check.status.url=http://YOUR_RM_NODE:8088/ws/v1/cluster/apps/${job_id}?anonymous=true</code></li> +</ul> + +<h4 id="hbase-cannot-get-master-address-from-zookeeper-on-hortonworks-sandbox">4. HBase cannot get master address from ZooKeeper on Hortonworks Sandbox</h4> + +<ul> + <li>By default hortonworks disables hbase, youâll have to start hbase in ambari homepage first.</li> +</ul> + +<h4 id="map-reduce-job-information-cannot-display-on-hortonworks-sandbox">5. Map Reduce Job information cannot display on Hortonworks Sandbox</h4> + +<ul> + <li>Check out <a href="https://github.com/KylinOLAP/Kylin/issues/40";>https://github.com/KylinOLAP/Kylin/issues/40</a></li> +</ul> + +<h4 id="how-to-install-kylin-on-cdh-52-or-hadoop-25x">6. How to Install Kylin on CDH 5.2 or Hadoop 2.5.x</h4> + +<ul> + <li>Check out discussion: <a href="https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!msg/kylin-olap/X0GZfsX1jLc/nzs6xAhNpLkJ";>https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!msg/kylin-olap/X0GZfsX1jLc/nzs6xAhNpLkJ</a></li> +</ul> + +<div class="highlight"><pre><code class="language-groff" data-lang="groff">I was able to deploy Kylin with following option in POM. + <hadoop2.version>2.5.0</hadoop2.version> + <yarn.version>2.5.0</yarn.version> + <hbase-hadoop2.version>0.98.6-hadoop2</hbase-hadoop2.version> + <zookeeper.version>3.4.5</zookeeper.version> + <hive.version>0.13.1</hive.version> + My Cluster is running on Cloudera Distribution CDH 5.2.0.</code></pre></div> + +<h4 id="sumfield-returns-a-negtive-result-while-all-the-numbers-in-this-field-are--0">7. SUM(field) returns a negtive result while all the numbers in this field are > 0</h4> +<ul> + <li>If a column is declared as integer in Hive, the SQL engine (calcite) will use columnâs type (integer) as the data type for âSUM(field)â, while the aggregated value on this field may exceed the scope of integer; in that case the cast will cause a negtive value be returned; The workround is, alter that columnâs type to BIGINT in hive, and then sync the table schema to Kylin (the cube doesnât need rebuild); Keep in mind that, always declare as BIGINT in hive for an integer column which would be used as a measure in Kylin; See hive number types: <a href="https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Types#LanguageManualTypes-NumericTypes";>https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Types#LanguageManualTypes-NumericTypes</a></li> +</ul> + +<h4 id="why-kylin-need-extract-the-distinct-columns-from-fact-table-before-building-cube">8. Why Kylin need extract the distinct columns from Fact Table before building cube?</h4> +<ul> + <li>Kylin uses dictionary to encode the values in each column, this greatly reduce the cubeâs storage size. To build the dictionary, Kylin need fetch the distinct values for each column.</li> +</ul> + +<h4 id="why-kylin-calculate-the-hive-table-cardinality">9. Why Kylin calculate the HIVE table cardinality?</h4> +<ul> + <li>The cardinality of dimensions is an important measure of cube complexity. The higher the cardinality, the bigger the cube, and thus the longer to build and the slower to query. Cardinality > 1,000 is worth attention and > 1,000,000 should be avoided at best effort. For optimal cube performance, try reduce high cardinality by categorize values or derive features.</li> +</ul> + +<h4 id="how-to-add-new-user-or-change-the-default-password">10. How to add new user or change the default password?</h4> +<ul> + <li>Kylin webâs security is implemented with Spring security framework, where the kylinSecurity.xml is the main configuration file:</li> +</ul> + +<div class="highlight"><pre><code class="language-groff" data-lang="groff">${KYLIN_HOME}/tomcat/webapps/kylin/WEB-INF/classes/kylinSecurity.xml</code></pre></div> + +<ul> + <li>The password hash for pre-defined test users can be found in the profile âsandbox,testingâ part; To change the default password, you need generate a new hash and then update it here, please refer to the code snippet in: <a href="https://stackoverflow.com/questions/25844419/spring-bcryptpasswordencoder-generate-different-password-for-same-input";>https://stackoverflow.com/questions/25844419/spring-bcryptpasswordencoder-generate-different-password-for-same-input</a></li> + <li>When you deploy Kylin for more users, switch to LDAP authentication is recommended.</li> +</ul> + +<h4 id="using-sub-query-for-un-supported-sql">11. Using sub-query for un-supported SQL</h4> + +<div class="highlight"><pre><code class="language-groff" data-lang="groff">Original SQL: +select fact.slr_sgmt, +sum(case when cal.RTL_WEEK_BEG_DT = '2015-09-06' then gmv else 0 end) as W36, +sum(case when cal.RTL_WEEK_BEG_DT = '2015-08-30' then gmv else 0 end) as W35 +from ih_daily_fact fact +inner join dw_cal_dt cal on fact.cal_dt = cal.cal_dt +group by fact.slr_sgmt</code></pre></div> + +<div class="highlight"><pre><code class="language-groff" data-lang="groff">Using sub-query +select a.slr_sgmt, +sum(case when a.RTL_WEEK_BEG_DT = '2015-09-06' then gmv else 0 end) as W36, +sum(case when a.RTL_WEEK_BEG_DT = '2015-08-30' then gmv else 0 end) as W35 +from ( + select fact.slr_sgmt as slr_sgmt, + cal.RTL_WEEK_BEG_DT as RTL_WEEK_BEG_DT, + sum(gmv) as gmv36, + sum(gmv) as gmv35 + from ih_daily_fact fact + inner join dw_cal_dt cal on fact.cal_dt = cal.cal_dt + group by fact.slr_sgmt, cal.RTL_WEEK_BEG_DT +) a +group by a.slr_sgmt</code></pre></div> + +<h4 id="build-kylin-meet-npm-errors-">12. Build kylin meet NPM errors (ä¸å½å¤§éå°åºç¨æ·è¯·ç¹å«æ³¨ææ¤é®é¢)</h4> + +<ul> + <li> + <p>Please add proxy for your NPM: <br /> + <code class="highlighter-rouge">npm config set proxy http://YOUR_PROXY_IP</code></p> + </li> + <li> + <p>Please update your local NPM repository to using any mirror of npmjs.org, like Taobao NPM (请æ´æ°æ¨æ¬å°çNPMä»åºä»¥ä½¿ç¨å½å çNPMéåï¼ä¾å¦æ·å®NPMéå) : <br /> + <a href="http://npm.taobao.org";>http://npm.taobao.org</a></p> + </li> +</ul> + +<h4 id="failed-to-run-buildcubewithenginetest-saying-failed-to-connect-to-hbase-while-hbase-is-active">13. Failed to run BuildCubeWithEngineTest, saying failed to connect to hbase while hbase is active</h4> +<ul> + <li>User may get this error when first time run hbase client, please check the error trace to see whether there is an error saying couldnât access a folder like â/hadoop/hbase/local/jarsâ; If that folder doesnât exist, create it.</li> +</ul> + + + </article> + </div> + </div> + </div> + </div> + </div> + <!-- +* Licensed to the Apache Software Foundation (ASF) under one +* or more contributor license agreements. See the NOTICE file +* distributed with this work for additional information +* regarding copyright ownership. The ASF licenses this file +* to you under the Apache License, Version 2.0 (the +* "License"); you may not use this file except in compliance +* with the License. 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