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Posted to commits@kylin.apache.org by lu...@apache.org on 2015/07/15 14:38:58 UTC
svn commit: r1691198 [4/17] - in /incubator/kylin/site: ./ blog/
blog/2015/01/25/introduce-data-model/
blog/2015/06/10/release-v0.7.1-incubating/ cn/docs/ cn/docs/install/
cn/docs/tutorial/ cn/download/ docs/ docs/development/ docs/gettingstarted/
docs...
Added: incubator/kylin/site/docs/development/dev_env.html
URL: http://svn.apache.org/viewvc/incubator/kylin/site/docs/development/dev_env.html?rev=1691198&view=auto
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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,
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+*
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+*
+* Unless required by applicable law or agreed to in writing, software
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+ <!--
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+* with the License. You may obtain a copy of the License at
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+ <li><a href="/cn" >ä¸æç</a></li>
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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,
+* 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.
+-->
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+<div class="col-md-3 col-lg-3 col-xs-4 aside1 visible-md visible-lg" id="nside1" style=" padding-top: 2em">
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+
+ <li><a href="#titleGetting Started" data-toggle="collapse" id="navtitle">Getting Started</a></li>
+ <div class="collapse in">
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+ </div>
+</div>
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+ <li><a href="#titleInstallation" data-toggle="collapse" id="navtitle">Installation</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="/docs/install/kylin_cluster.html" class="list-group-item-lay pjaxlink">Multiple Kylin REST servers</a></li>
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+ <li><a href="/docs/install/advance_settings.html" class="list-group-item-lay pjaxlink">Advance settings of Kylin environment</a></li>
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+ <li><a href="/docs/install/kylin_docker.html" class="list-group-item-lay pjaxlink">On Hadoop Kylin installation using 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="/docs/tutorial/create_cube.html" class="list-group-item-lay pjaxlink">Kylin Cube Creation Tutorial</a></li>
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+ <li><a href="/docs/tutorial/cube_build_job.html" class="list-group-item-lay pjaxlink">Kylin Cube Build and Job Monitoring Tutorial</a></li>
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+ <li><a href="/docs/tutorial/tableau.html" class="list-group-item-lay pjaxlink">Kylin and Tableau Tutorial</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 style="list-style-type:disc">
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+ <div class="collapse in">
+ <div class="list-group" id="list1">
+ <ul style="list-style-type:disc">
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+</div>
+ <div class="col-md-9 col-lg-9 col-xs-14 aside2">
+ <div id="container">
+ <div id="pjax">
+ <h1 class="post-title">Setup Development Env</h1>
+
+ <p>version: v0.7.2, since: v0.6</p>
+
+
+ <p>Off-Hadoop-CLI installation is usually for <strong>development use</strong>.</p>
+
+<p>Developers want to run kylin test cases or applications at their development machine. The scenario is depicted at <a href="https://github.com/KylinOLAP/Kylin#off-hadoop-cli-installation">https://github.com/KylinOLAP/Kylin#off-hadoop-cli-installation</a>.</p>
+
+<p>By following this tutorial, you will be able to build kylin test cubes by running a specific test case, and you can further run other test cases against the cubes having been built.</p>
+
+<h2 id="environment-on-the-hadoop-cli">Environment on the Hadoop CLI</h2>
+
+<p>Off-Hadoop-CLI installation requires you having a hadoop CLI machine (or a hadoop sandbox) as well as your local develop machine. To make things easier we strongly recommend you starting with running Kylin on a hadoop sandbox, like <a href="http://hortonworks.com/products/hortonworks-sandbox/">http://hortonworks.com/products/hortonworks-sandbox/</a>. In the following tutorial weâll go with <strong>Hortonworks Sandbox 2.2</strong>.</p>
+
+<h3 id="start-hadoop">Start Hadoop</h3>
+
+<p>In Hortonworks sandbox, ambari helps to launch hadoop:</p>
+
+<div class="highlight"><pre><code class="language-groff" data-lang="groff">ambari-agent start
+ ambari-server start</code></pre></div>
+
+<p>With both command successfully run you can go to ambari home page at <a href="http://yoursandboxip:8080">http://yoursandboxip:8080</a> (user:admin,password:admin) to check everythingâs status. By default ambari disables Hbase, youâll need manually start the <code class="highlighter-rouge">Hbase</code> service.</p>
+
+<p>For other hadoop distribution, basically start the hadoop cluster, make sure HDFS, YARN, Hive, HBase are running.</p>
+
+<h2 id="environment-on-the-dev-machine">Environment on the dev machine</h2>
+
+<h3 id="install-maven">Install maven</h3>
+
+<p>The latest maven can be found at <a href="http://maven.apache.org/download.cgi">http://maven.apache.org/download.cgi</a>, we create a symbolic so that <code class="highlighter-rouge">mvn</code> can be run anywhere.</p>
+
+<div class="highlight"><pre><code class="language-groff" data-lang="groff">cd ~
+ wget http://xenia.sote.hu/ftp/mirrors/www.apache.org/maven/maven-3/3.2.5/binaries/apache-maven-3.2.5-bin.tar.gz
+ tar -xzvf apache-maven-3.2.5-bin.tar.gz
+ ln -s /root/apache-maven-3.2.5/bin/mvn /usr/bin/mvn</code></pre></div>
+
+<h3 id="compile">Compile</h3>
+
+<p>First clone the Kylin project to your local:</p>
+
+<div class="highlight"><pre><code class="language-groff" data-lang="groff">git clone https://github.com/KylinOLAP/Kylin.git</code></pre></div>
+
+<p>Install Kylin artifacts to the maven repo</p>
+
+<div class="highlight"><pre><code class="language-groff" data-lang="groff">mvn clean install -DskipTests</code></pre></div>
+
+<h3 id="modify-local-configuration">Modify local configuration</h3>
+
+<p>Local configuration must be modified to point to your hadoop sandbox (or CLI) machine.</p>
+
+<ul>
+ <li>In <strong>examples/test_case_data/sandbox/kylin.properties</strong>
+ <ul>
+ <li>Find <code class="highlighter-rouge">sandbox</code> and replace with your hadoop hosts (if youâre using HDP sandbox, this can be skipped)</li>
+ <li>Fine <code class="highlighter-rouge">kylin.job.run.as.remote.cmd</code> and change it to âtrueâ (in code repository the default is false, which assume running it on hadoop CLI)</li>
+ <li>Find <code class="highlighter-rouge">kylin.job.remote.cli.username</code> and <code class="highlighter-rouge">kylin.job.remote.cli.password</code>, fill in the user name and password used to login hadoop cluster for hadoop command execution; If youâre using HDP sandbox, the default username is ârootâ and password is âhadoopâ.</li>
+ </ul>
+ </li>
+ <li>In <strong>examples/test_case_data/sandbox</strong>
+ <ul>
+ <li>For each configuration xml file, find all occurrence of <code class="highlighter-rouge">sandbox</code> and replace with your hadoop hosts; (if youâre using HDP sandbox, this can be skipped)</li>
+ </ul>
+ </li>
+</ul>
+
+<p>An alternative to the host replacement is updating your <code class="highlighter-rouge">hosts</code> file to resolve <code class="highlighter-rouge">sandbox</code> and <code class="highlighter-rouge">sandbox.hortonworks.com</code> to the IP of your sandbox machine.</p>
+
+<h3 id="run-unit-tests">Run unit tests</h3>
+
+<p>Run a end-to-end cube building test</p>
+
+<div class="highlight"><pre><code class="language-groff" data-lang="groff">mvn test -Dtest=com.kylinolap.job.BuildCubeWithEngineTest -DfailIfNoTests=false</code></pre></div>
+
+<p>Run other tests, the end-to-end cube building test is exclueded</p>
+
+<div class="highlight"><pre><code class="language-groff" data-lang="groff">mvn test</code></pre></div>
+
+<h3 id="launch-kylin-web-server">Launch Kylin Web Server</h3>
+
+<p>In your Eclipse IDE, launch <code class="highlighter-rouge">com.kylinolap.rest.DebugTomcat</code> with specifying VM arguments â-Dspring.profiles.active=sandboxâ. (By default Kylin server will listen on 7070 port; If you want to use another port, please specify it as a parameter when run `DebugTomcat)</p>
+
+<p>Check Kylin Web available at http://localhost:7070/kylin (user:ADMIN,password:KYLIN)</p>
+
+
+ </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
+* limitations under the License.
+-->
+
+<footer id="underfooter">
+ <div class="container">
+ <div class="row">
+ <div class="col-md-12 widget" >
+ <div class="widget-body" style="text-align:center">
+ <div>
+ Apache Kylin is an effort undergoing incubation at The Apache Software Foundation (ASF), sponsored by the Apache Incubator. Incubation is required of all newly accepted projects until a further review indicates that the infrastructure, communications, and decision making process have stabilized in a manner consistent with other successful ASF projects. While incubation status is not necessarily a reflection of the completeness or stability of the code, it does indicate that the project has yet to be fully endorsed by the ASF.
+ </div>
+ <p style="text-align:center" > Apache Kylin is distributed under the <a href="http://www.apache.org/licenses/LICENSE-2.0" target="_blank">Apache License v2.0. </a>
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+*
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+*
+* 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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+-->
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+*
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+ <li><a href="/docs/install/index.html" class="list-group-item-lay pjaxlink">Installation Guide</a></li>
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+ <li><a href="/docs/install/kylin_docker.html" class="list-group-item-lay pjaxlink">On Hadoop Kylin installation using 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="/docs/tutorial/create_cube.html" class="list-group-item-lay pjaxlink">Kylin Cube Creation Tutorial</a></li>
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+ <li><a href="/docs/tutorial/cube_build_job.html" class="list-group-item-lay pjaxlink">Kylin Cube Build and Job Monitoring Tutorial</a></li>
+
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+ <li><a href="/docs/tutorial/acl.html" class="list-group-item-lay pjaxlink">Kylin Cube Permission Grant Tutorial</a></li>
+
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+ <li><a href="/docs/tutorial/web.html" class="list-group-item-lay pjaxlink">Kylin Web Tutorial</a></li>
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+ <li><a href="/docs/tutorial/tableau.html" class="list-group-item-lay pjaxlink">Kylin and Tableau Tutorial</a></li>
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+ <li><a href="/docs/tutorial/odbc.html" class="list-group-item-lay pjaxlink">Kylin ODBC Driver Tutorial</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="/docs/howto/howto_contribute.html" class="list-group-item-lay pjaxlink">How to Contribute</a></li>
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+ <li><a href="/docs/howto/howto_jdbc.html" class="list-group-item-lay pjaxlink">How to use kylin remote jdbc driver</a></li>
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+ <li><a href="/docs/howto/howto_backup.html" class="list-group-item-lay pjaxlink">Backup Kylin HBase data</a></li>
+
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+ <li><a href="/docs/howto/howto_upgrade.html" class="list-group-item-lay pjaxlink">How to Upgrade</a></li>
+
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+ <li><a href="/docs/howto/howto_release.html" class="list-group-item-lay pjaxlink">How to making a release</a></li>
+
+
+
+
+
+
+
+
+ <ul>
+ </div>
+</div>
+
+ <li><a href="#titleDevelopment" data-toggle="collapse" id="navtitle">Development</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="/docs/development/dev_env.html" class="list-group-item-lay pjaxlink">Setup Development Env</a></li>
+
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+ <li><a href="/docs/development/metadata_store.html" class="list-group-item-lay pjaxlink">Kylin Metadata Store</a></li>
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+ <li><a href="/docs/development/new_metadata.html" class="list-group-item-lay pjaxlink">New meta data model structure</a></li>
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+ <li><a href="/docs/development/rest_api.html" class="list-group-item-lay pjaxlink">REST API</a></li>
+
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+ <li><a href="/docs/development/build_api.html" class="list-group-item-lay pjaxlink">Build Cube with Restful API</a></li>
+
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+ <li><a href="/docs/development/javascript_api.html" class="list-group-item-lay pjaxlink">How to consume Kylin REST API in javascript</a></li>
+
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+ <li><a href="/docs/development/web_tech.html" class="list-group-item-lay pjaxlink">Kylin web front end summary</a></li>
+
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+ <li><a href="/docs/development/test_minicluster.html" class="list-group-item-lay pjaxlink">Run Kylin test case with HBase Mini Cluster</a></li>
+
+
+
+
+
+
+
+
+ <ul>
+ </div>
+</div>
+
+ <li><a href="#titleMeta" data-toggle="collapse" id="navtitle">Meta</a></li>
+ <div class="collapse in">
+ <div class="list-group" id="list1">
+ <ul style="list-style-type:disc">
+
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+ <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">How to consume Kylin REST API in javascript</h1>
+
+ <p>version: v0.7.2, since: v0.7.1</p>
+
+
+ <p>Kypin securicty authorization is based on basic access authorization, so when you want to use API in your javascript,you need to involve the authorization info in http headers.</p>
+
+<h2 id="here-is-a-demo-show-how-to-use-kylin-query-api">Here is a demo show how to use Kylin Query API.</h2>
+<div class="highlighter-rouge"><pre class="highlight"><code>$.ajaxSetup({
+ headers: { 'Authorization': "Basic eWFu**********X***ZA==", 'Content-Type': 'application/json;charset=utf-8' } // use your own authorization code here
+ });
+ var request = $.ajax({
+ url: "http://hostname/kylin/api/query",
+ type: "POST",
+ data: '{"sql":"select count(*) from SUMMARY;","offset":0,"limit":50000,"partial":true,"project":"test"}',
+ dataType: "json"
+ });
+ request.done(function( msg ) {
+ alert(msg);
+ });
+ request.fail(function( jqXHR, textStatus ) {
+ alert( "Request failed: " + textStatus );
+ });
+
+</code></pre>
+</div>
+
+<p>For what is basic access authorization ,click here http://en.wikipedia.org/wiki/Basic_access_authentication</p>
+
+<h2 id="keypoint">Keypoint:</h2>
+<ol>
+ <li>add basic access authorization info in heders.</li>
+ <li>use right ajax type and right data synax</li>
+</ol>
+
+<p>How to generate your authorization code (download and import âjquery.base64.jsâ from https://github.com/yckart/jquery.base64.js)</p>
+
+<div class="highlighter-rouge"><pre class="highlight"><code>var authorizationCode = $.base64('encode', 'NT_USERNAME' + ":" + 'NT_PASSWORD');
+
+$.ajaxSetup({
+ headers: {
+ 'Authorization': "Basic " + authorizationCode,
+ 'Content-Type': 'application/json;charset=utf-8'
+ }
+});
+</code></pre>
+</div>
+
+ </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
+* limitations under the License.
+-->
+
+<footer id="underfooter">
+ <div class="container">
+ <div class="row">
+ <div class="col-md-12 widget" >
+ <div class="widget-body" style="text-align:center">
+ <div>
+ Apache Kylin is an effort undergoing incubation at The Apache Software Foundation (ASF), sponsored by the Apache Incubator. Incubation is required of all newly accepted projects until a further review indicates that the infrastructure, communications, and decision making process have stabilized in a manner consistent with other successful ASF projects. While incubation status is not necessarily a reflection of the completeness or stability of the code, it does indicate that the project has yet to be fully endorsed by the ASF.
+ </div>
+ <p style="text-align:center" > Apache Kylin is distributed under the <a href="http://www.apache.org/licenses/LICENSE-2.0" target="_blank">Apache License v2.0. </a>
+ </p>
+ </div>
+ </div>
+ </div>
+ <!-- /row of widgets -->
+
+ </div>
+ <div></div>
+
+</footer>
+
+ <script src="/assets/js/jquery-1.9.1.min.js"></script>
+ <script src="/assets/js/bootstrap.min.js"></script>
+ <script src="/assets/js/main.js"></script>
+ </body>
+</html>
Added: incubator/kylin/site/docs/development/metadata_store.html
URL: http://svn.apache.org/viewvc/incubator/kylin/site/docs/development/metadata_store.html?rev=1691198&view=auto
==============================================================================
--- incubator/kylin/site/docs/development/metadata_store.html (added)
+++ incubator/kylin/site/docs/development/metadata_store.html Wed Jul 15 12:38:54 2015
@@ -0,0 +1,2051 @@
+<!--
+* 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 | Kylin Metadata Store</title>
+ <meta name="description" content="Apache Kylin Home">
+ <meta name="author" content="Apache Kylin">
+ <link rel="shortcut icon" href="fav.png" type="image/png">
+
+
+
+<link rel="stylesheet" href="/assets/css/animate.css">
+<!-- Bootstrap -->
+<link rel="stylesheet" href="/assets/css/bootstrap.min.css">
+
+<!-- Fonts -->
+<!-- <link rel="stylesheet" href="http://fonts.googleapis.com/css?family=Alice|Open+Sans:400,300,700"> -->
+
+<!-- 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.incubator.apache.org/docs/development/metadata_store.html">
+ <link rel="alternate" type="application/rss+xml" title="kylin.io" href="http://kylin.incubator.apache.org/feed.xml" />
+
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+ <li><a href="/docs/tutorial/cube_build_job.html" class="list-group-item-lay pjaxlink">Kylin Cube Build and Job Monitoring Tutorial</a></li>
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+ <li><a href="/docs/tutorial/acl.html" class="list-group-item-lay pjaxlink">Kylin Cube Permission Grant Tutorial</a></li>
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+ <li><a href="/docs/tutorial/odbc.html" class="list-group-item-lay pjaxlink">Kylin ODBC Driver Tutorial</a></li>
+
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+</div>
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+ <li><a href="#titleHow To" data-toggle="collapse" id="navtitle">How To</a></li>
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+ <ul>
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+ <li><a href="/docs/development/dev_env.html" class="list-group-item-lay pjaxlink">Setup Development Env</a></li>
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+ <li><a href="/docs/development/test_minicluster.html" class="list-group-item-lay pjaxlink">Run Kylin test case with HBase Mini Cluster</a></li>
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+ <li><a href="#titleMeta" data-toggle="collapse" id="navtitle">Meta</a></li>
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+ <div class="col-md-9 col-lg-9 col-xs-14 aside2">
+ <div id="container">
+ <div id="pjax">
+ <h1 class="post-title">Kylin Metadata Store</h1>
+
+ <p>version: v0.7.2, since: v0.7.1</p>
+
+
+ <p>Kylin organizes all of its metadata(including cube descriptions and instances, projects, inverted index description and instances, jobs, tables and dictionaries) as a hierarchy file system. However, Kylin uses hbase to store it, rather than normal file system. If you check your kylin configuration file(kylin.properties) you will find such a line:</p>
+
+<div class="highlight"><pre><code class="language-groff" data-lang="groff"># The metadata store in hbase
+kylin.metadata.url=kylin_metadata_qa@hbase:sandbox.hortonworks.com:2181:/hbase-unsecure</code></pre></div>
+
+<p>This indicates that the metadata will be saved as a htable called <code class="highlighter-rouge">kylin_metadata_qa</code>. You can scan the htable in hbase shell to check it out.</p>
+
+<h1 id="backup-metadata-store">Backup Metadata Store</h1>
+
+<p>Sometimes you need to backup the Kylinâs Metadata Store from hbase to your disk file system.<br />
+In such cases, assuming youâre on the hadoop CLI(or sandbox) where you deployed Kylin, you can use:</p>
+
+<div class="highlight"><pre><code class="language-groff" data-lang="groff">mkdir ~/meta_dump
+
+hbase org.apache.hadoop.util.RunJar PATH_TO_KYLIN_JOB_JAR_FOLDER/kylin-job-x.x.x-SNAPSHOT-job.jar com.kylinolap.common.persistence.ResourceTool copy PATH_TO_KYLIN_CONFIG/kylin.properties ~/meta_dump</code></pre></div>
+
+<p>to dump your metadata to your local folder ~/meta_dump.</p>
+
+<h1 id="restore-metadata-store">Restore Metadata Store</h1>
+
+<p>In case you find your metadata store messed up, and you want to restore to a previous backup:</p>
+
+<p>first clean up the metadata store:</p>
+
+<div class="highlight"><pre><code class="language-groff" data-lang="groff">hbase org.apache.hadoop.util.RunJar PATH_TO_KYLIN_JOB_JAR_FOLDER/kylin-job-x.x.x-SNAPSHOT-job.jar com.kylinolap.common.persistence.ResourceTool reset</code></pre></div>
+
+<p>then upload the backup metadata in ~/meta_dump to Kylinâs metadata store:</p>
+
+<div class="highlight"><pre><code class="language-groff" data-lang="groff">hbase org.apache.hadoop.util.RunJar PATH_TO_KYLIN_JOB_JAR_FOLDER/kylin-job-x.x.x-SNAPSHOT-job.jar com.kylinolap.common.persistence.ResourceTool copy ~/meta_dump PATH_TO_KYLIN_CONFIG/kylin.properties</code></pre></div>
+
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+ Apache Kylin is an effort undergoing incubation at The Apache Software Foundation (ASF), sponsored by the Apache Incubator. Incubation is required of all newly accepted projects until a further review indicates that the infrastructure, communications, and decision making process have stabilized in a manner consistent with other successful ASF projects. While incubation status is not necessarily a reflection of the completeness or stability of the code, it does indicate that the project has yet to be fully endorsed by the ASF.
+ </div>
+ <p style="text-align:center" > Apache Kylin is distributed under the <a href="http://www.apache.org/licenses/LICENSE-2.0" target="_blank">Apache License v2.0. </a>
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