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<img src="https://www.apache.org/images/SupportApache-small.png"; > + </div> + </a> + </div> + </div> + + </header> + + + <div class="container"> + <div class="row" style="clear:both;"> + <div class="col-md-8 col-lg-8 col-xs-12 col-sm-12 aside2" style="float:right;"> + <div id="container" class="docs"> + <div id="pjax"> + <h1 class="post-title">Lambda mode and Timezone in Real-time OLAP</h1> + + + <article class="post-content" > + <p>Kylin v3.0.0 will release the real-time OLAP feature, by the power of newly added streaming reciever cluster, Kylin can query streaming data with sub-second latency. You can check <a href="/blog/2019/04/12/rt-streaming-design/">this tech blog</a> for the overall design and core concept.</p> + +<p>If you want to find a step by step tutorial, please check this <a href="/docs/tutorial/realtime_olap.html">this tech blog</a>.<br /> +In this article, we will introduce how to update segment and set timezone for derived time column in realtime OLAP cube.</p> + +<h1 id="background">Background</h1> + +<p>Says we have Kafka message which looks like this:</p> + +<div class="highlight"><pre><code class="language-groff" data-lang="groff">{ + "s_nation":"SAUDI ARABIA", + "lo_supplycost":74292, + "p_category":"MFGR#0910", + "local_day_hour_minute":"09_21_44", + "event_time":"2019-12-09 08:44:50.000-0500", + "local_day_hour":"09_21", + "lo_quantity":12, + "lo_revenue":1411548, + "p_brand":"MFGR#0910051", + "s_region":"MIDDLE EAST", + "lo_discount":5, + "customer_info":{ + "CITY":"CHINA 057", + "REGION":"ASIA", + "street":"CHINA 05721", + "NATION":"CHINA" + }, + "d_year":1994, + "d_weeknuminyear":30, + "p_mfgr":"MFGR#09", + "v_revenue":7429200, + "d_yearmonth":"Jul1994", + "s_city":"SAUDI ARA15", + "profit_ratio":0.05263157894736842, + "d_yearmonthnum":199407, + "round":1 +}</code></pre></div> + +<p>This sample comes from SSB with some additional fields such as <code class="highlighter-rouge">event_time</code>. We have the field such as <code class="highlighter-rouge">event_time</code>, which stands for the timestamp of current event. <br /> +And we assume that event come from countries of different timezone, â2019-12-09 08:44:50.000-0500â indicated that event applies <code class="highlighter-rouge">America/New_York</code> timezone. You may have some events which come from <code class="highlighter-rouge">Asia/Shanghai</code> as well.</p> + +<p><code class="highlighter-rouge">local_day_hour_minute</code> is a column which value is in local timezone, eg. âGMT+8â in the above sample.</p> + +<h3 id="question">Question</h3> +<p>When perform realtime OLAP analysis with Kylin, you may have some concerns included:</p> + +<ol> + <li>Will events in different timezones cause incorrect query results?</li> + <li>How could I make it correct when kafka messages contain the value which is not what you want, says some dimension value is misspelled?</li> + <li>How could I retrieve long-late messages which has been dropped?</li> + <li>My query only hit a small range of time, how should I write filter condition to make sure unused segments are purged/skipped from scan?</li> +</ol> + +<h3 id="quick-answer">Quick Answer</h3> +<p>For the first question, you can always get the correct result in the right timezone of location by set <code class="highlighter-rouge">kylin.stream.event.timezone=GMT+N</code> for all Kylin processes. By default, UTC is used for <em>derived time column</em>.</p> + +<p>For the second and third question, in fact you cannot update/append segment to a normal streaming cube, but you can update/append a streaming cube which in lambda mode, all you need to prepare is creating a Hive table which is mapped to your kafka event.</p> + +<p>For the fourth question, you can achieved this by adding <em>derived time column</em> in your filter condition like <code class="highlighter-rouge">MINUTE_START</code>/<code class="highlighter-rouge">DAY_START</code> etc.</p> + +<h1 id="how-to-do">How to do</h1> + +<h3 id="configure-timezone">Configure timezone</h3> +<p>We know message may come from different timezone, but you want query results using some specific timezone. <br /> +For example, if you live in some place in GMT+2, please set <code class="highlighter-rouge">kylin.stream.event.timezone=GMT+2</code> for all Kylin process.</p> + +<h3 id="create-lambda-table">Create lambda table</h3> + +<p>You should create a hive table in <em>default</em> namespace, and this table should contains all your dimension and measure columns, please <br /> + remember to include derived time column like <code class="highlighter-rouge">MINUTE_START</code>/<code class="highlighter-rouge">DAY_START</code> if you set them in your cubeâs dimension column.</p> + +<p>Depend on which granularity level you want to update segment, you can choose HOUR_START* or <code class="highlighter-rouge">DAY_START</code> as partition column of this hive table.</p> + +<div class="highlight"><pre><code class="language-groff" data-lang="groff">use default; +CREATE EXTERNAL TABLE IF NOT EXISTS lambda_flat_table +( +-- event timestamp and debug purpose column +EVENT_TIME timestamp +,ROUND bigint COMMENT "For debug purpose, in which round did this event sent by producer" +,LOCAL_DAY_HOUR string COMMENT "For debug purpose, maybe check timezone etc" +,LOCAL_MINUTE string COMMENT "For debug purpose, maybe check timezone etc" + +-- dimension column on fact table +,LO_QUANTITY bigint +,LO_DISCOUNT bigint + +-- dimension column on dimension table +,C_REGION string +,C_NATION string +,C_CITY string + +,D_YEAR int +,D_YEARMONTH string +,D_WEEKNUMINYEAR int +,D_YEARMONTHNUM int + +,S_REGION string +,S_NATION string +,S_CITY string + +,P_CATEGORY string +,P_BRAND string +,P_MFGR string + + +-- measure column on fact table +,V_REVENUE bigint +,LO_SUPPLYCOST bigint +,LO_REVENUE bigint +,PROFIT_RATIO double + +-- for kylin used +,MINUTE_START timestamp +,HOUR_START timestamp +,MONTH_START date +) +PARTITIONED BY (DAY_START date) +STORED AS SEQUENCEFILE +LOCATION 'hdfs:///LacusDir/lambda_flat_table';</code></pre></div> + +<h3 id="create-streaming-cube-in-kylin">Create streaming cube in Kylin</h3> +<p>The first step is to add information like broker list and topic name; <br /> +after that, you should paste sample message into left and let Kylin auto-detect the column name and column type.<br /> +You may find some data type is not correct, please fix them manually and make sure they are aligned to the data type in Hive table.</p> + +<p>For example, you should change the data type of event_time from varchar to timestamp.<br /> +And some column names are not the same as Hive Table, so please correct them too, such as <code class="highlighter-rouge">customer_info_REGION</code> to <code class="highlighter-rouge">C_REGION</code>.</p> + +<p><img src="/images/RealtimeOlap/Before-Submit.png" alt="image" /></p> + +<p>After that, please choose the right <em>TSColumn</em> <em>TSParser</em> and correct <em>Table Name</em>, table name should be identical to the name of Hive Table. After that, you should click <em>submit</em> buttom.<br /> +If you are lucky enough, table meta info will be saved successfully, otherwise please correct data type and column name according to output message.</p> + +<p>When you are creating Model, please set <em>Partition Date Column</em> with the right value. For streaming cube, <em>Partition Date Column</em> is used to generate HQL in updating segment which source data is from Hive.<br /> +<img src="/images/RealtimeOlap/CreateStreamingModel.png" alt="image" /></p> + +<h3 id="check-result-with-timezone">Check result with timezone</h3> + +<p>Let us do a quick check to compare whether <em>LOCAL_MINUTE</em> is aligned to <em>HOUR_START</em>.</p> + +<div class="highlight"><pre><code class="language-groff" data-lang="groff">SELECT LOCAL_MINUTE, HOUR_START, sum(LO_SUPPLYCOST) +FROM LAMBDA_FLAT_TABLE +WHERE day_start = '2019-12-09' +GROUP BY LOCAL_MINUTE, HOUR_START +ORDER BY LOCAL_MINUTE, HOUR_START</code></pre></div> + +<p><img src="/images/RealtimeOlap/Timezone-checkresult.png" alt="image" /></p> + +<h3 id="update-segment">Update segment</h3> + +<ol> + <li>Use some ETL tools like spark streaming to write correct data into HDFS, and add new partition based on your new data files.</li> + <li>After that, use Rest API <code class="highlighter-rouge">http://localhost:7070/kylin/api/cubes/{cube_name}/rebuild</code> [Put Method] to submit a build job to replace old segments, <br /> +please add offset according to timezone in <code class="highlighter-rouge">startTime</code> and <code class="highlighter-rouge">endTime</code> if you have set <code class="highlighter-rouge">kylin.stream.event.timezone</code>.</li> + <li>In some case, you want to add to a lot of historical data into Kylin streaming cube to analyse(not replace something), you can also use the method.</li> +</ol> + +<p><img src="/images/RealtimeOlap/JobMonitor.png" alt="image" /><br /> +<img src="/images/RealtimeOlap/LambdaCubeSegment.png" alt="image" /></p> + +<h3 id="some-screenshots">Some screenshots</h3> +<p><img src="/images/RealtimeOlap/Table-Meta-1.png" alt="image" /><br /> +<img src="/images/RealtimeOlap/Table-Meta-2.png" alt="image" /><br /> +<img src="/images/RealtimeOlap/Table-Meta-3.png" alt="image" /></p> + + + </article> + </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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