Author: lidong
Date: Tue Aug 3 10:55:02 2021
New Revision: 1891980
URL: http://svn.apache.org/viewvc?rev=1891980&view=rev
Log:
Add new blog about How Meituan Dominates Online Shopping with Apache Kylin
Added:
kylin/site/blog/2021/08/
kylin/site/blog/2021/08/03/
kylin/site/blog/2021/08/03/How-Meituan-Dominates-Online-Shopping-with-Apache-Kylin/
kylin/site/blog/2021/08/03/How-Meituan-Dominates-Online-Shopping-with-Apache-Kylin/index.html
kylin/site/cn_blog/2021/08/
kylin/site/cn_blog/2021/08/03/
kylin/site/cn_blog/2021/08/03/How-Meituan-Dominates-Online-Shopping-with-Apache-Kylin/
kylin/site/cn_blog/2021/08/03/How-Meituan-Dominates-Online-Shopping-with-Apache-Kylin/index.html
kylin/site/images/blog/meituan/
kylin/site/images/blog/meituan/chart-01.jpeg (with props)
kylin/site/images/blog/meituan/chart-02.png (with props)
kylin/site/images/blog/meituan/chart-03.jpeg (with props)
kylin/site/images/blog/meituan/chart-04.png (with props)
kylin/site/images/blog/meituan/chart-05.jpeg (with props)
kylin/site/images/blog/meituan/chart-06.jpeg (with props)
kylin/site/images/blog/meituan/chart-07.jpeg (with props)
kylin/site/images/blog/meituan/chart-08.jpeg (with props)
kylin/site/images/blog/meituan/chart-09.jpeg (with props)
kylin/site/images/blog/meituan_cn/
kylin/site/images/blog/meituan_cn/chart-01.png (with props)
kylin/site/images/blog/meituan_cn/chart-02.png (with props)
kylin/site/images/blog/meituan_cn/chart-03.png (with props)
kylin/site/images/blog/meituan_cn/chart-04.png (with props)
kylin/site/images/blog/meituan_cn/chart-05.png (with props)
kylin/site/images/blog/meituan_cn/chart-06.png (with props)
kylin/site/images/blog/meituan_cn/chart-07.png (with props)
kylin/site/images/blog/meituan_cn/chart-08.png (with props)
kylin/site/images/blog/meituan_cn/chart-09.png (with props)
kylin/site/images/blog/meituan_cn/chart-10.png (with props)
kylin/site/images/blog/meituan_cn/chart-11.png (with props)
kylin/site/images/blog/meituan_cn/chart-12.png (with props)
kylin/site/images/blog/meituan_cn/chart-13.png (with props)
kylin/site/images/blog/meituan_cn/chart-14.png (with props)
kylin/site/images/blog/meituan_cn/chart-15.png (with props)
kylin/site/images/blog/meituan_cn/chart-16.png (with props)
kylin/site/images/blog/meituan_cn/chart-17.png (with props)
kylin/site/images/blog/meituan_cn/chart-18.png (with props)
kylin/site/images/blog/meituan_cn/chart-19.png (with props)
kylin/site/images/blog/meituan_cn/chart-20.png (with props)
kylin/site/images/blog/meituan_cn/chart-21.png (with props)
kylin/site/images/blog/meituan_cn/chart-22.png (with props)
kylin/site/images/blog/meituan_cn/chart-23.png (with props)
kylin/site/images/blog/meituan_cn/chart-24.png (with props)
Modified:
kylin/site/blog/index.html
kylin/site/cn/blog/index.html
kylin/site/feed.xml
Added:
kylin/site/blog/2021/08/03/How-Meituan-Dominates-Online-Shopping-with-Apache-Kylin/index.html
URL:
http://svn.apache.org/viewvc/kylin/site/blog/2021/08/03/How-Meituan-Dominates-Online-Shopping-with-Apache-Kylin/index.html?rev=1891980&view=auto
==============================================================================
---
kylin/site/blog/2021/08/03/How-Meituan-Dominates-Online-Shopping-with-Apache-Kylin/index.html
(added)
+++
kylin/site/blog/2021/08/03/How-Meituan-Dominates-Online-Shopping-with-Apache-Kylin/index.html
Tue Aug 3 10:55:02 2021
@@ -0,0 +1,9032 @@
+<!--
+* 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
+*
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+* 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
+* limitations under the License.
+-->
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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
+*
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+*
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+* distributed under the License is distributed on an "AS IS" BASIS,
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Kylin</title>
+ <meta name="description" content="Letâs face it, online shopping now
affects nearly every part of our shopping lives. From ordering groceries to
purchasing a car, weâre living in an age of li...">
+ <meta name="author" content="Apache Kylin">
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+* or more contributor license agreements. See the NOTICE file
+* distributed with this work for additional information
+* regarding copyright ownership. The ASF licenses this file
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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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+-->
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+ <ul>
+ </li>
+
+ <li class="dropdown-submenu"><a href="#titleHow To"
data-toggle="collapse" class="navtitle">How To</a>
+ <ul class="dropdown-menu">
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+ <a href="/docs/howto/howto_use_restapi.html"
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+ </li>
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+ <a href="/docs/howto/howto_build_cube_with_restapi.html"
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+ </li>
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+ <a href="/docs/howto/howto_optimize_cubes.html"
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+ <li class="navlist">
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+ <li class="navlist">
+ <a href="/docs/howto/howto_use_cli.html" class="list-group-item-lay
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+ <li class="navlist">
+ <a href="/docs/howto/howto_ldap_and_sso.html"
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+ </li>
+
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+ <li class="navlist">
+ <a href="/docs/howto/howto_use_beeline.html"
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+
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+
+ <li class="navlist">
+ <a href="/docs/howto/howto_install_ranger_kylin_plugin.html"
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+
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+ <li class="navlist">
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+
+
+ <li class="navlist">
+ <a href="/docs/howto/howto_use_hive_mr_dict.html"
class="list-group-item-lay pjaxlink">Use Hive to build global dictionary</a>
+ </li>
+
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+ <li class="navlist">
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+* distributed with this work for additional information
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+
+<div class="post" style=" padding:2em 4em 4em 4em">
+
+ <header class="post-header">
+ <h1 class="post-title">How Meituan Dominates Online Shopping with Apache
Kylin</h1>
+ <p class="post-meta" >Aug 3, 2021 ⢠Yueqing Wang</p>
+ </header>
+
+ <article class="post-content" >
+ <p>Letâs face it, online shopping now affects nearly every part of our
shopping lives. From ordering groceries to <a
href="https://www.carvana.com/";>purchasing a car</a>, weâre living in an age
of limitless choices when it comes to online commerce. Nowhere is this more the
case than with the worldâs 2nd largest consumer market: China.</p>
+
+<p>Leading the online shopping revolution in China is Meituan, who since 2016
has grown to support nearly 460 million consumers from over 2,000 industries,
regularly processing hundreds of $billions in transactions. To support these
staggering operations, Meituan has invested heavily in its data analytics
system and employs more than 10,000 engineers to ensure a stable and reliable
experience for their customers.</p>
+
+<p>But the driving force behind Meituanâs success is not simply a robust
analytics system. While the organizationâs executives might think so, its
engineers understand that it is the OLAP engine that system is built upon that
has empowered the company to move quickly and win in the market.</p>
+
+<h2 id="meituans-secret-weapon-apache-kylin"><strong>Meituanâs Secret
Weapon: Apache Kylin</strong></h2>
+
+<p>Since 2016, Meituanâs technical team has relied on<a
href="https://kyligence.io/apache-kylin-overview/";> Apache Kylin</a> to power
their<a href="https://kyligence.io/resources/extreme-olap-with-apache-kylin/";>
OLAP engine</a>. Apache Kylin, an open source OLAP engine built on the Hadoop
platform, resolves complex queries at sub-second speeds through
multidimensional precomputation, allowing for blazing-fast analysis on even the
largest datasets.</p>
+
+<p>However, the limitations of this open source solution became apparent as
the companyâs business grew, becoming less and less efficient as cubes and
queries became larger and more complex. To solve this problem, the engineering
team leveraged Kylinâs open source foundations to dig into the engine,
understand its underlying principles, and develop an implementation strategy
that other organizations using Kylin can adopt to greatly improve their data
output efficiency.</p>
+
+<p>Meituanâs technical team has graciously shared their story of this
process below so that you can apply it toward solving your own big data
challenges.</p>
+
+<h2 id="a-global-pandemic-and-a-new-normal-for-business"><strong>A Global
Pandemic and a New Normal for Business</strong></h2>
+
+<p>For the last four years, Meituanâs Qingtian sales system has served as
the companyâs data processing workhorse, handling massive amounts of daily
sales data involving a wide range of highly complex technical scenarios. The
stability and efficiency of this system is paramount, and itâs why
Meituanâs engineers have made significant investments in optimizing the OLAP
engine Qingtian is built upon.</p>
+
+<p>After a thorough investigation, the team identified Apache Kylin as the
only OLAP engine that could meet their needs and scale with anticipated growth.
The engine was rolled out in 2016 and, over the next few years, Kylin played an
important role in the companyâs evolving data analytics system.</p>
+
+<p>Growth expectations, however, turned out to be severely underestimated, as
a global pandemic quickly drove major changes in how consumers shopped and how
businesses sold their goods. Such a massive shift in online shopping led to
even faster growth for Meituan as well as a nearly untenable amount of new
business data.</p>
+
+<p>This caused efficiency bottlenecks that even their Kylin-based system
started to struggle with. Cube building and query performance was unable to
keep up with these changes in consumer behaviors, slowing down data analysis
and decision-making and creating a major obstacle towards addressing user
experiences.</p>
+
+<p>Meituanâs technical team would spend the next six months carrying out
optimizations and iterations for Kylin, including dimension pruning, model
design, resource adaptation, and improving SLA compliance.</p>
+
+<h2
id="responding-to-new-consumer-behaviors-with-apache-kylin"><strong>Responding
to New Consumer Behaviors with Apache Kylin</strong></h2>
+
+<p>In order to understand the approach taken when optimizing Meituanâs data
architecture, itâs important to understand how the business is managed. The
companyâs sales force operates with two business models â in-store sales
and phone sales â and is then further broken down by various territories and
corporate departments. All analytics data must be communicated across both
business models.</p>
+
+<p>With this in mind, Meituan engineers incorporated Kylin into their design
of the data architecture as follows:</p>
+
+<p><img src="/images/blog/meituan/chart-01.jpeg" alt="" /></p>
+
+<p>Figure 3. Apache Kylinâs layer-by-layer building data flow</p>
+
+<p>While this design addressed many of Meituanâs initial concerns around
scalability and efficiency, continued shifts in consumer behaviors and the
organizationâs response to dramatic changes in the market put enormous
pressure on Kylin when it came to building cubes. This lead to an unsustainable
level of consumption of both resources and time.</p>
+
+<p>It became clear that Kylinâs MOLAP model was presenting the following
challenges:</p>
+
+<ul>
+ <li>The build process involved many steps that were highly correlated,
making it difficult to root cause problems.</li>
+ <li>MapReduce - instead of the more efficient Spark - was still being used
as the build engine for historical tasks.</li>
+ <li>The platformâs default dynamic resource adaption method demanded
considerable resources for small tasks. Data was sharded unnecessarily and a
large number of small files were generated, resulting in a waste of
resources.</li>
+ <li>Data volumes Meituan was now having to work with were well beyond the
original architectural plan, resulting in two hours of cube building every
day.</li>
+ <li>The overall SLA fulfillment rate remained lower than expected.</li>
+</ul>
+
+<p>Recognizing these problems, the team set a goal of improving the
platformâs efficiency (you can see the quantitative targets below). Finding a
solution would involve classifying Kylinâs build process, digging into how
Kylin worked under the hood, breaking down that process, and finally
implementing a solution.</p>
+
+<p><img src="/images/blog/meituan/chart-02.png" alt="" /></p>
+
+<p>Figure 4. Implementation path diagram</p>
+
+<h2
id="optimization-understanding-how-apache-kylin-builds-cubes"><strong>Optimization:
Understanding How Apache Kylin Builds Cubes</strong></h2>
+
+<p>Understanding the cube building process is critical for pinpointing
efficiency and performance issues. In the case of Kylin, a solid grasp of its
precomputation approach and its âby layerâ cubing algorithm are necessary
when formulating a solution.</p>
+
+<p><strong>Precomputation with Apache Kylin</strong></p>
+
+<p>Apache Kylin generates all possible dimensional combinations and
pre-calculates the metrics that may be used in future multidimensional
analysis, saving the results as a cube. Metric aggregation results are saved on
<em>cuboids</em> (a logical branch of the cube), and during queries relevant
cuboids are found through SQL statements, and then read and quickly returned as
metric values.</p>
+
+<p><img src="/images/blog/meituan/chart-03.jpeg" alt="" /></p>
+
+<p>Figure 5. Precomputation across four dimensions example</p>
+
+<p><strong>Apache Kylinâs By-Layer Cubing Algorithm</strong></p>
+
+<p>An N-dimensional cube is composed of 1 N-dimensional sub-cube, N
(N-1)-dimensional sub-cubes, N*(N-1)/2 (N-2)-dimensional sub-cubes, â¦, N
1-dimensional sub-cubes, and one 0-dimensional sub-cube, consisting of a total
of 2^N sub-cubes. In Kylinâs by-layer cubing algorithm, the number of
dimensions decreases with the calculation of each layer, and each layerâs
calculation is based on the calculation result of its parent layer (except the
first layer, which bases it on the source data).</p>
+
+<p><img src="/images/blog/meituan/chart-04.png" alt="" /></p>
+
+<p>Figure 6. Cuboid example</p>
+
+<h2 id="the-proof-is-in-the-process"><strong>The Proof Is in the
Process</strong></h2>
+
+<p>Understanding the principles outlined above, the Meituan team identified
five key areas to focus on for optimization: engine selection, data reading,
dictionary building, layer-by-layer build, and file conversion. Addressing
these areas would lead to the greatest gains in reducing the required resources
for calculation and shortening processing time.</p>
+
+<p>The team outlined the challenges, their solutions, and key objectives in
the following table:</p>
+
+<p><img src="/images/blog/meituan/chart-05.jpeg" alt="" /></p>
+
+<p>Figure 7. Breakdown of Apache Kylinâs process</p>
+
+<h2 id="putting-apache-kylin-to-the-test"><strong>Putting Apache Kylin to the
Test</strong></h2>
+
+<p>With their solutions in place, the next step was to test if Kylinâs build
process had actually improved. To do this, the team selected a set of critical
sales tasks and ran a pilot (outlined below):</p>
+
+<p><img src="/images/blog/meituan/chart-06.jpeg" alt="" /></p>
+
+<p>Figure 8. Meituanâs pilot program for their Apache Kylin optimizations</p>
+
+<p>The results of the pilot were astonishing. Ultimately, the team was able to
realize a significant reduction in resource consumption as seen in the
following chart:</p>
+
+<p><img src="/images/blog/meituan/chart-07.jpeg" alt="" /></p>
+
+<p>Figure 9. Resource usage and performance of Apache Kylin before and after
pilot</p>
+
+<h2 id="analytics-optimized"><strong>Analytics Optimize</strong>d</h2>
+
+<p>Today, Meituanâs Qingtian system is processing over 20 different Kylin
tasks, and after six months of constant optimization, the monthly CU usage for
Kylinâs resource queue and the CU usage for pending tasks have seen
significant reductions.</p>
+
+<p><img src="/images/blog/meituan/chart-08.jpeg" alt="" /></p>
+
+<p>Figure 10. Current performance of Apache Kylin after solution
implementation</p>
+
+<p>Resource usage isnât the only area of impressive improvement. The
Qingtian systemâs SLA compliance also was able to reach 100% as of June
2020.</p>
+
+<p><img src="/images/blog/meituan/chart-09.jpeg" alt="" /></p>
+
+<p>Figure 11. Meituan SLA compliance after Apache Kylin optimization</p>
+
+<h2 id="taking-on-the-future-with-apache-kylin"><strong>Taking on the Future
with Apache Kylin</strong></h2>
+
+<p>Over the past four years, Meituanâs technical team has accumulated a
great deal of experience in optimizing query performance and build efficiency
with Apache Kylin. But Meituanâs success is also the story of open sourceâs
success.</p>
+
+<p>The<a href="http://kylin.apache.org/community/";> Apache Kylin community</a>
has many active and outstanding code contributors (<a
href="https://kyligence.io/comparing-kylin-vs-kyligence/";>including
Kyligence</a>), who are relentlessly working to expand the Kylin ecosystem and
add more new features. Itâs in sharing success stories like this that Apache
Kylin is able to remain the leading open source solution for analytics on
massive datasets.</p>
+
+<p>Together, with the entire Apache Kylin community, Meituan is making sure
critical analytics work can remain unburdened by growing datasets, and that
when the next major shift in business takes place, industry leaders like
Meituan will be able to analyze whatâs happening and quickly take action.</p>
+
+ </article>
+
+</div>
+
+
+
+
+
+ </article>
+ </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
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Modified: kylin/site/blog/index.html
URL:
http://svn.apache.org/viewvc/kylin/site/blog/index.html?rev=1891980&r1=1891979&r2=1891980&view=diff
==============================================================================
--- kylin/site/blog/index.html (original)
+++ kylin/site/blog/index.html Tue Aug 3 10:55:02 2021
@@ -8824,6 +8824,16 @@ var _hmt = _hmt || [];
<div class="col-md-6 col-lg-6 col-xs-12">
+ <a class="blog-card"
href="/blog/2021/08/03/How-Meituan-Dominates-Online-Shopping-with-Apache-Kylin/">
+ <div class="blog-pic">
+ <img width="20" src="../assets/images/icon_blog_w.png" />
+ </div>
+ <p class="blog-title">How Meituan Dominates Online Shopping
with Apache Kylin</p>
+ <p align="left" class="post-meta">posted: Aug 3, 2021</p>
+ </a>
+ </div>
+
+ <div class="col-md-6 col-lg-6 col-xs-12">
<a class="blog-card"
href="/blog/2021/07/02/Apache-Kylin4-A-new-storage-and-compute-architecture/">
<div class="blog-pic">
<img width="20" src="../assets/images/icon_blog_w.png" />
Modified: kylin/site/cn/blog/index.html
URL:
http://svn.apache.org/viewvc/kylin/site/cn/blog/index.html?rev=1891980&r1=1891979&r2=1891980&view=diff
==============================================================================
--- kylin/site/cn/blog/index.html (original)
+++ kylin/site/cn/blog/index.html Tue Aug 3 10:55:02 2021
@@ -8826,6 +8826,16 @@ var _hmt = _hmt || [];
<div class="col-md-6 col-lg-6 col-xs-12">
+ <a class="blog-card"
href="/cn_blog/2021/08/03/How-Meituan-Dominates-Online-Shopping-with-Apache-Kylin/">
+ <div class="blog-pic">
+ <img width="20" src="/assets/images/icon_blog_w.png" />
+ </div>
+ <p class="blog-title">Kylin
å¨ç¾å¢å°åºé¤é¥®çå®è·µåä¼å</p>
+ <p align="left" class="post-meta">posted: Aug 3, 2021</p>
+ </a>
+ </div>
+
+ <div class="col-md-6 col-lg-6 col-xs-12">
<a class="blog-card"
href="/cn_blog/2021/07/29/kylin-on-parquet-new-architecture-share/">
<div class="blog-pic">
<img width="20" src="/assets/images/icon_blog_w.png" />
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