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Posted to commits@kylin.apache.org by li...@apache.org on 2017/08/18 06:20:52 UTC

svn commit: r1805365 [7/27] - in /kylin/site: ./ blog/ cn/docs21/ cn/docs21/install/ cn/docs21/tutorial/ cn/download/ docs21/ docs21/gettingstarted/ docs21/howto/ docs21/install/ docs21/tutorial/ download/ images/tutorial/2.1/ images/tutorial/2.1/push_...

Added: kylin/site/docs21/gettingstarted/faq.html
URL: http://svn.apache.org/viewvc/kylin/site/docs21/gettingstarted/faq.html?rev=1805365&view=auto
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--- kylin/site/docs21/gettingstarted/faq.html (added)
+++ kylin/site/docs21/gettingstarted/faq.html Fri Aug 18 06:20:51 2017
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+<!--
+* 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.  You may obtain a copy of the License at
+*
+*     http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+-->
+
+<!doctype html>
+<html>
+	<!--
+* 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.  You may obtain a copy of the License at
+*
+*     http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+-->
+
+<head>
+  <meta charset="utf-8">
+  <meta http-equiv="X-UA-Compatible" content="IE=edge">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+
+  <title>Apache Kylin | FAQ</title>
+  <meta name="description" content="Apache Kylin Home">
+  <meta name="author"      content="Apache Kylin">
+  <link rel="shortcut icon" href="fav.png" type="image/png">
+
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+<!-- Bootstrap -->
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+
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+<!-- <link rel="stylesheet" href="http://fonts.googleapis.com/css?family=Alice|Open+Sans:400,300,700"> -->
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+<!-- Icons -->
+<link rel="stylesheet" href="/assets/css/font-awesome.min.css">
+
+  <!-- Custom styles -->
+  <link rel="stylesheet" href="/assets/css/styles.css">
+  <link rel="stylesheet" href="/assets/css/docs.css">
+  <link rel="stylesheet" href="/assets/css/pygments.css">
+
+  <link rel="canonical" href="http://kylin.apache.org/docs21/gettingstarted/faq.html">
+  <link rel="alternate" type="application/rss+xml" title="Apache Kylin" href="http://kylin.apache.org/feed.xml" />
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+<script type="text/javascript" src="/assets/js/jquery-1.9.1.min.js"></script>
+<script type="text/javascript" src="/assets/js/nside.js"></script> </script>
+<script type="text/javascript" src="/assets/js/nnav.js"></script> </script>
+</head>
+
+	<body>
+		<!--
+* 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.  You may obtain a copy of the License at
+*
+*     http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+-->
+
+<header id="header" >
+  
+  <div id="head" class="parallax" parallax-speed="3" >
+    <div id="logo" class="text-center"> <img class="img-circle" id="circlelogo" src="/assets/images/kylin_logo.jpg"> <span class="title" >Apache Kylin™</span> <span class="tagline">Extreme OLAP Engine for Big Data</span> 
+    </div>
+    <div class="text-center" style="
+      position: relative;
+      top: 66px;
+      width: 1080px;
+      margin: 0 auto;
+      z-index: 11;
+      margin-top: -253px;
+      text-align: right;"
+    >
+      <a href="http://apache.org/foundation/contributing.html" title="Support Apache" style="margin-left: 150px;">
+          <img src="https://www.apache.org/images/SupportApache-small.png" style="height: 150px; width: 150px;">
+      </a>
+    </div>  
+  </div>
+  
+
+  <!-- Main Menu -->
+  <nav class="navbar navbar-default" role="navigation" id="nav-wrapper">
+  <div class="container-fluid" id="nav">
+    <!--
+    <img class="img-circle" width="40px" height="40px" id="circlelogo" src="/assets/images/kylin_logo.jpg">
+    -->
+    <!-- Brand and toggle get grouped for better mobile display -->
+    <div class="navbar-header">
+      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
+        <span class="sr-only">Toggle navigation</span>
+        <span class="icon-bar"></span>
+        <span class="icon-bar"></span>
+        <span class="icon-bar"></span>
+      </button>
+     
+    </div>
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+    <!-- Collect the nav links, forms, and other content for toggling -->
+    <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
+      <ul class="nav navbar-nav">
+     <li><a href="/">Home</a></li>
+          <li><a href="/docs20" >Docs</a></li>
+          <li><a href="/download">Download</li>
+          <li><a href="/community" >Community</a></li>
+          <li><a href="/development" >Development</a></li>
+          <li><a href="/blog">Blog</li>
+          <li><a href="/cn" >中文版</a></li>  
+          <li><a href="https://twitter.com/apachekylin" target="_blank" class="fa fa-twitter fa-lg" title="Twitter: @ApacheKylin" ></a></li>
+          <li><a href="https://github.com/apache/kylin" target="_blank" class="fa fa-github-alt fa-lg" title="Github: apache/kylin" ></a></li>          
+          <li><a href="https://www.facebook.com/kylinio" target="_blank" class="fa fa-facebook fa-lg" title="Facebook: kylin.io" ></a></li>   
+      </ul>      
+    </div><!-- /.navbar-collapse -->
+  </div><!-- /.container-fluid -->
+</nav>
+ </header>
+
+		
+		<div class="container">
+			<div class="row">
+				<!--
+* 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.  You may obtain a copy of the License at
+*
+*     http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+-->
+
+<div class="col-md-3 col-lg-3 col-xs-4 aside1 visible-md visible-lg" id="nside1" style=" padding-top: 2em">
+    <ul class="nav nav-pills nav-stacked">
+    
+    <li><a href="#titleGetting Started" data-toggle="collapse" id="navtitle">Getting Started</a></li>
+    <div class="collapse in">
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+      
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+        <ul>
+  </div>
+</div>
+    
+    <li><a href="#titleInstallation" data-toggle="collapse" id="navtitle">Installation</a></li>
+    <div class="collapse in">
+  	<div class="list-group" id="list1">
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+      <li><a href="/docs21/install/kylin_cluster.html" class="list-group-item-lay pjaxlink" id="navlist">Deploy in Cluster Mode</a></li>      
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+      <li><a href="/docs21/install/kylin_docker.html" class="list-group-item-lay pjaxlink" id="navlist">Run Kylin with Docker</a></li>      
+      
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+        <ul>
+  </div>
+</div>
+    
+    <li><a href="#titleTutorial" data-toggle="collapse" id="navtitle">Tutorial</a></li>
+    <div class="collapse in">
+  	<div class="list-group" id="list1">
+    <ul style="list-style-type:disc">
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+      <li><a href="/docs21/tutorial/odbc.html" class="list-group-item-lay pjaxlink" id="navlist">Kylin ODBC Driver</a></li>      
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+      <li><a href="/docs21/tutorial/flink.html" class="list-group-item-lay pjaxlink" id="navlist">Connect from Apache Flink</a></li>      
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+      <li><a href="/docs21/tutorial/squirrel.html" class="list-group-item-lay pjaxlink" id="navlist">Connect from SQuirreL</a></li>      
+      
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+      <li><a href="/docs21/tutorial/cube_build_performance.html" class="list-group-item-lay pjaxlink" id="navlist">Cube Build Tuning Step by Step</a></li>      
+      
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+      <li><a href="/docs21/tutorial/hue.html" class="list-group-item-lay pjaxlink" id="navlist">Connect from Apache Hue</a></li>      
+      
+
+
+
+
+
+
+
+        <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 style="list-style-type:disc">
+    
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+      <li><a href="/docs21/howto/howto_build_cube_with_restapi.html" class="list-group-item-lay pjaxlink" id="navlist">Build Cube with RESTful API</a></li>      
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+      <li><a href="/docs21/howto/howto_use_restapi_in_js.html" class="list-group-item-lay pjaxlink" id="navlist">Use RESTful API in Javascript</a></li>      
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+      <li><a href="/docs21/howto/howto_upgrade.html" class="list-group-item-lay pjaxlink" id="navlist">Upgrade From Old Versions</a></li>      
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+      <li><a href="/docs21/howto/howto_ldap_and_sso.html" class="list-group-item-lay pjaxlink" id="navlist">Enable Security with LDAP and SSO</a></li>      
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+      <li><a href="/docs21/howto/howto_use_beeline.html" class="list-group-item-lay pjaxlink" id="navlist">Use Beeline for Hive Commands</a></li>      
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+      <li><a href="/docs21/howto/howto_update_coprocessor.html" class="list-group-item-lay pjaxlink" id="navlist">How to Update HBase Coprocessor</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. “bin/find-hive-dependency.sh” can locate hive/hcat jars in local, but Kylin reports error like “java.lang.NoClassDefFoundError: org/apache/hive/hcatalog/mapreduce/HCatInputFormat” or “java.lang.NoClassDefFoundError: org/apache/hadoop/hive/ql/session/SessionState”</h4>
+
+<ul>
+  <li>
+    <p>Kylin need many dependent jars (hadoop/hive/hcat/hbase/kafka) on classpath to work, but Kylin doesn’t 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 jars’ 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 doesn’t keep the origin <code class="highlighter-rouge">HBASE_CLASSPATH</code> value, that causes the “NoClassDefFoundError”.</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/*:$HBASE_CLASSPATH</code></pre></div>
+
+<h4 id="get-javalangillegalargumentexception-too-high-cardinality-is-not-suitable-for-dictionary----cardinality-5220674-in-build-dimension-dictionary-step">2. Get “java.lang.IllegalArgumentException: Too high cardinality is not suitable for dictionary – cardinality: 5220674” in “Build Dimension Dictionary” step</h4>
+
+<ul>
+  <li>Kylin uses “Dictionary” encoding to encode/decode the dimension values (check <a href="/blog/2015/08/13/kylin-dictionary/">this blog</a>); Usually a dimension’s cardinality is less than millions, so the “Dict” encoding is good to use. As dictionary need be persisted and loaded into memory, if a dimension’s cardinality is very high, the memory footprint will be tremendous, so Kylin add a check on this. If you see this error, suggest to identify the UHC dimension first and then re-evaluate the design (whether need to make that as dimension?). If must keep it, you can by-pass this error with couple ways: 1) change to use other encoding (like <code class="highlighter-rouge">fixed_length</code>, <code class="highlighter-rouge">integer</code>) 2) or set a bigger value for <code class="highlighter-rouge">kylin.dictionary.max.cardinality</code> in <code class="highlighter-rouge">conf/kylin.properties</code>.</li>
+</ul>
+
+<h4 id="build-cube-failed-due-to-error-check-status">3. Build cube failed due to “error check status”</h4>
+
+<ul>
+  <li>Check if <code class="highlighter-rouge">kylin.log</code> contains <em>yarn.resourcemanager.webapp.address:http://0.0.0.0:8088</em> and <em>java.net.ConnectException: Connection refused</em></li>
+  <li>If yes, then the problem is the address of resource manager was not available in yarn-site.xml</li>
+  <li>A workaround is update <code class="highlighter-rouge">kylin.properties</code>, set <code class="highlighter-rouge">kylin.job.yarn.app.rest.check.status.url=http://YOUR_RM_NODE:8088/ws/v1/cluster/apps/${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, you’ll 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&amp;utm_source=footer#!msg/kylin-olap/X0GZfsX1jLc/nzs6xAhNpLkJ">https://groups.google.com/forum/?utm_medium=email&amp;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.
+  &lt;hadoop2.version&gt;2.5.0&lt;/hadoop2.version&gt;
+  &lt;yarn.version&gt;2.5.0&lt;/yarn.version&gt;
+  &lt;hbase-hadoop2.version&gt;0.98.6-hadoop2&lt;/hbase-hadoop2.version&gt;
+  &lt;zookeeper.version&gt;3.4.5&lt;/zookeeper.version&gt;
+  &lt;hive.version&gt;0.13.1&lt;/hive.version&gt;
+  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 &gt; 0</h4>
+<ul>
+  <li>If a column is declared as integer in Hive, the SQL engine (calcite) will use column’s type (integer) as the data type for “SUM(field)”, 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 column’s type to BIGINT in hive, and then sync the table schema to Kylin (the cube doesn’t 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 cube’s 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 &gt; 1,000 is worth attention and &gt; 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 web’s 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 “sandbox,testing” 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 (中国大陆地区用户请特别注意此问题)</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 (请更新您本地的NPM仓库以使用国内的NPM镜像,例如淘宝NPM镜像) :  <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 couldn’t access a folder like “/hadoop/hbase/local/jars”; If that folder doesn’t 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.  You may obtain a copy of the License at
+*
+*     http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* 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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+-->
+
+<footer id="underfooter">
+    <div class="container">
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+
+                    <div>
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+                    </div>
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--- kylin/site/docs21/gettingstarted/terminology.html (added)
+++ kylin/site/docs21/gettingstarted/terminology.html Fri Aug 18 06:20:51 2017
@@ -0,0 +1,2793 @@
+<!--
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+* "License"); you may not use this file except in compliance
+* with the License.  You may obtain a copy of the License at
+*
+*     http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
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+* See the License for the specific language governing permissions and
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+-->
+
+<!doctype html>
+<html>
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+  <meta name="description" content="Apache Kylin Home">
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+
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+<script type="text/javascript" src="/assets/js/nnav.js"></script> </script>
+</head>
+
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+		<!--
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+* to you under the Apache License, Version 2.0 (the
+* "License"); you may not use this file except in compliance
+* with the License.  You may obtain a copy of the License at
+*
+*     http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+-->
+
+<header id="header" >
+  
+  <div id="head" class="parallax" parallax-speed="3" >
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+    </div>
+    <div class="text-center" style="
+      position: relative;
+      top: 66px;
+      width: 1080px;
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+      <li><a href="/docs21/install/hadoop_env.html" class="list-group-item-lay pjaxlink" id="navlist">Hadoop Environment</a></li>      
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+      <li><a href="/docs21/install/kylin_cluster.html" class="list-group-item-lay pjaxlink" id="navlist">Deploy in Cluster Mode</a></li>      
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+      <li><a href="/docs21/install/advance_settings.html" class="list-group-item-lay pjaxlink" id="navlist">Advanced Settings</a></li>      
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+      <li><a href="/docs21/install/kylin_docker.html" class="list-group-item-lay pjaxlink" id="navlist">Run Kylin with Docker</a></li>      
+      
+
+
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+
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+
+        <ul>
+  </div>
+</div>
+    
+    <li><a href="#titleTutorial" data-toggle="collapse" id="navtitle">Tutorial</a></li>
+    <div class="collapse in">
+  	<div class="list-group" id="list1">
+    <ul style="list-style-type:disc">
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+      <li><a href="/docs21/tutorial/kylin_sample.html" class="list-group-item-lay pjaxlink" id="navlist">Quick Start with Sample Cube</a></li>      
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+      <li><a href="/docs21/tutorial/create_cube.html" class="list-group-item-lay pjaxlink" id="navlist">Kylin Cube Creation</a></li>      
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+      <li><a href="/docs21/tutorial/cube_build_job.html" class="list-group-item-lay pjaxlink" id="navlist">Kylin Cube Build and Job Monitoring</a></li>      
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+      <li><a href="/docs21/tutorial/cube_spark.html" class="list-group-item-lay pjaxlink" id="navlist">Build Cube with Spark (beta)</a></li>      
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+      <li><a href="/docs21/tutorial/acl.html" class="list-group-item-lay pjaxlink" id="navlist">Kylin Cube Permission</a></li>      
+      
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+      <li><a href="/docs21/tutorial/web.html" class="list-group-item-lay pjaxlink" id="navlist">Kylin Web Interface</a></li>      
+      
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+    
+      <li><a href="/docs21/tutorial/tableau.html" class="list-group-item-lay pjaxlink" id="navlist">Tableau 8</a></li>      
+      
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+      <li><a href="/docs21/tutorial/tableau_91.html" class="list-group-item-lay pjaxlink" id="navlist">Tableau 9</a></li>      
+      
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+    
+      <li><a href="/docs21/tutorial/powerbi.html" class="list-group-item-lay pjaxlink" id="navlist">MS Excel and Power BI</a></li>      
+      
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+    
+      <li><a href="/docs21/tutorial/odbc.html" class="list-group-item-lay pjaxlink" id="navlist">Kylin ODBC Driver</a></li>      
+      
+
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+  
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+  
+    
+      <li><a href="/docs21/tutorial/flink.html" class="list-group-item-lay pjaxlink" id="navlist">Connect from Apache Flink</a></li>      
+      
+
+
+
+  
+      
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+      <li><a href="/docs21/tutorial/squirrel.html" class="list-group-item-lay pjaxlink" id="navlist">Connect from SQuirreL</a></li>      
+      
+
+
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+    
+      <li><a href="/docs21/tutorial/cube_build_performance.html" class="list-group-item-lay pjaxlink" id="navlist">Cube Build Tuning Step by Step</a></li>      
+      
+
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+      <li><a href="/docs21/tutorial/hue.html" class="list-group-item-lay pjaxlink" id="navlist">Connect from Apache Hue</a></li>      
+      
+
+
+
+
+
+
+
+        <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 style="list-style-type:disc">
+    
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+      <li><a href="/docs21/howto/howto_build_cube_with_restapi.html" class="list-group-item-lay pjaxlink" id="navlist">Build Cube with RESTful API</a></li>      
+      
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+      <li><a href="/docs21/howto/howto_use_restapi_in_js.html" class="list-group-item-lay pjaxlink" id="navlist">Use RESTful API in Javascript</a></li>      
+      
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+  
+    
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+    
+  
+    
+  
+    
+      <li><a href="/docs21/howto/howto_use_restapi.html" class="list-group-item-lay pjaxlink" id="navlist">Use RESTful API</a></li>      
+      
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+    
+      <li><a href="/docs21/howto/howto_optimize_cubes.html" class="list-group-item-lay pjaxlink" id="navlist">Optimize Cube Design</a></li>      
+      
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+
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+  
+      
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+  
+    
+      <li><a href="/docs21/howto/howto_optimize_build.html" class="list-group-item-lay pjaxlink" id="navlist">Optimize Cube Build</a></li>      
+      
+
+
+
+  
+      
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+    
+  
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+
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+  
+    
+  
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+  
+    
+  
+    
+      <li><a href="/docs21/howto/howto_backup_metadata.html" class="list-group-item-lay pjaxlink" id="navlist">Backup Metadata</a></li>      
+      
+
+
+
+  
+      
+
+  
+    
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+    
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+  
+    
+  
+    
+      <li><a href="/docs21/howto/howto_cleanup_storage.html" class="list-group-item-lay pjaxlink" id="navlist">Cleanup Storage (HDFS & HBase)</a></li>      
+      
+
+
+
+  
+      
+
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+    
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+  
+    
+  
+    
+  
+    
+      <li><a href="/docs21/howto/howto_jdbc.html" class="list-group-item-lay pjaxlink" id="navlist">Use JDBC Driver</a></li>      
+      
+
+
+
+  
+      
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+    
+  
+    
+      <li><a href="/docs21/howto/howto_upgrade.html" class="list-group-item-lay pjaxlink" id="navlist">Upgrade From Old Versions</a></li>      
+      
+
+
+
+  
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+  
+    
+      <li><a href="/docs21/howto/howto_ldap_and_sso.html" class="list-group-item-lay pjaxlink" id="navlist">Enable Security with LDAP and SSO</a></li>      
+      
+
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+    
+      <li><a href="/docs21/howto/howto_use_beeline.html" class="list-group-item-lay pjaxlink" id="navlist">Use Beeline for Hive Commands</a></li>      
+      
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+    
+      <li><a href="/docs21/howto/howto_update_coprocessor.html" class="list-group-item-lay pjaxlink" id="navlist">How to Update HBase Coprocessor</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">Terminology</h1>
+							
+							
+							<article class="post-content" >	
+							<p>Here are some domain terms we are using in Apache Kylin, please check them for your reference.   <br />
+They are basic knowledge of Apache Kylin which also will help to well understand such concerpt, term, knowledge, theory and others about Data Warehouse, Business Intelligence for analycits.</p>
+
+<ul>
+  <li><strong>Data Warehouse</strong>: a data warehouse (DW or DWH), also known as an enterprise data warehouse (EDW), is a system used for reporting and data analysis, <a href="https://en.wikipedia.org/wiki/Data_warehouse">wikipedia</a></li>
+  <li><strong>Business Intelligence</strong>: Business intelligence (BI) is the set of techniques and tools for the transformation of raw data into meaningful and useful information for business analysis purposes, <a href="https://en.wikipedia.org/wiki/Business_intelligence">wikipedia</a></li>
+  <li><strong>OLAP</strong>: OLAP is an acronym for <a href="https://en.wikipedia.org/wiki/Online_analytical_processing">online analytical processing</a></li>
+  <li><strong>OLAP Cube</strong>: an OLAP cube is an array of data understood in terms of its 0 or more dimensions, <a href="http://en.wikipedia.org/wiki/OLAP_cube">wikipedia</a></li>
+  <li><strong>Star Schema</strong>: the star schema consists of one or more fact tables referencing any number of dimension tables, <a href="https://en.wikipedia.org/wiki/Star_schema">wikipedia</a></li>
+  <li><strong>Fact Table</strong>: a Fact table consists of the measurements, metrics or facts of a business process, <a href="https://en.wikipedia.org/wiki/Fact_table">wikipedia</a></li>
+  <li><strong>Lookup Table</strong>: a lookup table is an array that replaces runtime computation with a simpler array indexing operation, <a href="https://en.wikipedia.org/wiki/Lookup_table">wikipedia</a></li>
+  <li><strong>Dimension</strong>: A dimension is a structure that categorizes facts and measures in order to enable users to answer business questions. Commonly used dimensions are people, products, place and time, <a href="https://en.wikipedia.org/wiki/Dimension_(data_warehouse)">wikipedia</a></li>
+  <li><strong>Measure</strong>: a measure is a property on which calculations (e.g., sum, count, average, minimum, maximum) can be made, <a href="https://en.wikipedia.org/wiki/Measure_(data_warehouse)">wikipedia</a></li>
+  <li><strong>Join</strong>: a SQL join clause combines records from two or more tables in a relational database, <a href="https://en.wikipedia.org/wiki/Join_(SQL)">wikipedia</a></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.  You may obtain a copy of the License at
+*
+*     http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* 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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