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Slide decks
2016-02-11 09:37:51 -05:00
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<meta charset="utf-8">
<title>Pocket Data</title>
<meta name="description" content="What is Pocket Data, and Why does it matter?">
<meta name="author" content="Oliver Kennedy">
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Exploring <u><b>O</b></u>nline <u><b>D</b></u>ata <u><b>In</b></u>teractions
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Move over to HTTPS
2017-08-31 17:18:47 -04:00
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Slide decks
2016-02-11 09:37:51 -05:00
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</div>
<div class="slides">
<section>
<section>
<h1>Pocket Data</h1>
<h4>(What's in <em>your</em> pocket?)</h4>
<p>Jerry Ajay<br/><u>Oliver Kennedy</u>, Geoff Challen, Luke Ziarek</p>
</section>
<section>
<h2>Big Data!</h2>
<img src="../graphics/databases/database-server.svg" height="350" style="float: left" class="fragment grow fade-in" />
<ul style="width: 500px;">
<li class="fragment">GB, <span style="font-size: 130%">TB</span>, or <span style="font-size: 160%">PB</span> of Data!</li>
<li class="fragment">Hundreds of thousands of updates per second!</li>
<li class="fragment">Thousands of nodes computing together!</li>
<li class="fragment">"Virtually" infinite resources!</li>
</ul>
</section>
<section>
<h2>Everyone Loves Big Data!</h2>
</section>
<section>
<h3>Everyone Loves Measuring Big Data!</h3>
<br/>
<svg height="400" width="600">
<image xlink:href="../graphics/databases/database-server.svg"
x="188" y="50"
width="225" height="270"
/>
<text x=50 y=80>TPC-C</text>
<text x=240 y=30>TPC-H</text>
<text x=440 y=80>SSB</text>
<text x=460 y=180>TPC-DS</text>
<text x=440 y=290>TPC-DI</text>
<text x=200 y=360>PolePosition</text>
<text x=50 y=290>YCSB</text>
<text x=10 y=180>TPC-E</text>
<attribution>http://openclipart.org</attribution>
</section>
<section>
<img src="graphics/awesome.jpg" height=350 />
<h2>Big Data is Awesome!</h2>
<attribution>The Lego Movie (Warner Brothers)</attribution>
</section>
<section>
<h3>This talk is <b><u>not</u></b> about big data.</h3>
</section>
</section>
<section>
<section>
<p>The average smartphone evaluates<br/>about 180 queries per day</p>
<p class="fragment">That's about <b>2 queries every second.</b></p>
</section>
<section>
<img src="graphics/SQLPhone.png" height=400 style="float:right" />
<ul style="width: 450px">
<li>Is this big data? <span class="fragment" style="margin-left: 40px" data-fragment-index="1"><b>No</b></span></li>
<li>Is this important? <span class="fragment" style="margin-left: 40px; color: green; font-size: 120%" data-fragment-index="5"><b>Yes!</b></span>
<ul style="font-size: 70%">
<li class="fragment" data-fragment-index="2"><b>Multi-Tenency:</b> The phone is more than just a DB.</li>
<li class="fragment" data-fragment-index="3"><b>Power:</b> 1-2 days of battery life under ideal circumstances.</li>
<li class="fragment" data-fragment-index="4"><b>It’s Everywhere:</b> Odds are that your phone is running some queries right now!</li>
</ul>
</li>
</ul>
</section>
<section>
<img src="graphics/SQLPhone.png" height=400 />
<h3>We need to understand Pocket-Scale Data!</h3>
</section>
<section>
<h2>SQLite</h2>
<svg width="396" height="450" style="float: right">
<image xlink:href="graphics/PhoneBase.png"
x="0" y="50"
width="396" height="353"
/>
<image xlink:href="graphics/AndroidArch.png"
x="65" y="70"
width="265" height="205"
/>
</svg>
<ul style="width: 450px; font-size: 70%;">
<li><b>Embedded:</b> SQLite is a library</li>
<li><b>Un-shared:</b> SQLite DBs are specific to one client “app”.</li>
<li><b>Lightweight:</b> Entire SQLite DB is backed to one file.</li>
<li><b>Universal:</b> SQLite client library is available by default in nearly all major OSes.</li>
<li><b>“Easy”:</b> Duck Typing, Relaxed SQL Syntax, One Big Lock (file)</li>
</ul>
</section>
<section>
<h3>How do smartphone devs use SQLite?</h3>
</section>
</section>
<section>
<section>
<img src="../graphics/logos/phonelab.png" style="float: left" height="200"/>
<div style="height: 180px; margin-top: 40px">
<h3>PhoneLab</h3>
<h5 style="color: grey;">A Smartphone Platform Testbed</h5>
</div>
<p style="width: 800px">
~200 UB students, faculty, and staff using instrumented LG Nexus 5 smartphones in exchange for discounted service.</p>
</section>
<section>
<img src="../graphics/logos/phonelab.png" style="float: left" height="150"/>
<div style="height: 140px; margin-top: 40px">
<h4>PhoneLab</h4>
<h5 style="color: grey;"><small>A Smartphone Platform Testbed</small></h5>
</div>
<ul style="font-size: 80%">
<li><b>Preliminary Trial:</b> 11 phones for ~1 month (254 phone/days)</li>
<li>Instrumented SQLite logs <b>all</b> statements (~45 mil statements)<ul>
<li>~33.5 million <code>SELECT</code> statements</li>
<li>~9.4 million <code>INSERT</code> statements</li>
<li>~1 million <code>UPDATE</code> statements</li>
<li>~1.2 million <code>DELETE</code> statements</li>
<li>179 distinct ‘apps’ issuing statements</li>
</ul></li>
</ul>
</section>
<section>
<p><a href="https://phone-lab.org/experiment/request">https://phone-lab.org/experiment/request</a></p>
<img src="../graphics/qrcodes/qrcode.phonelabdemodata.png" />
</section>
</section>
<section>
<section>
<h3>What did we see in the data?</h3>
</section>
<section data-background="#000000">
<img src="graphics/cthulhu.jpg" height="500"/>
<br/>
<attribution style="color: grey;">http://wrathofzombie.wordpress.com/</attribution>
</section>
<section>
<h3>No, seriously... what did you see?</h3>
<ul>
<li class="fragment">SELECTs ranging the complexity spectrum</li>
<li class="fragment">ORMs being stupid</li>
<li class="fragment">Lots of aggregation</li>
<li class="fragment">Workloads that were a little too read heavy</li>
<li class="fragment">... And some very odd inter-query timings</li>
</ul>
</section>
</section>
<section>
<section>
<ul>
<li style="font-weight: bold; font-size: 125%;">SELECT Complexity</li>
<li>ORM Effects</li>
<li>Function Usage</li>
<li>Read/Write Ratios</li>
<li>Query Periodicity</li>
</ul>
</section>
<section>
<h3>SELECT Complexity</h3>
<svg width=800 height=600>
<image xlink:href="graphics/select_breakdown_by_nesting.png"
x="0" y="150"
width="400" height="237"
/>
<image xlink:href="graphics/select_breakdown_by_width.png"
x="400" y="150"
width="400" height="237"
/>
<text class="fragment" data-fragment-index="1" x=150 y=100>30 million simple "SPA" queries</text>
<line class="fragment" data-fragment-index="1" x1="250" y1="110" x2="153" y2="175" style="stroke:rgb(0,0,0);stroke-width:3" />
<line class="fragment" data-fragment-index="1" x1="450" y1="110" x2="507" y2="175" style="stroke:rgb(0,0,0);stroke-width:3" />
<text class="fragment" data-fragment-index="2" x=100 y=420>Infrequent, but extremely complex queries</text>
<line class="fragment" data-fragment-index="2" x1="400" y1="390" x2="356" y2="333" style="stroke:rgb(0,0,0);stroke-width:3" />
<line class="fragment" data-fragment-index="2" x1="700" y1="390" x2="752" y2="333" style="stroke:rgb(0,0,0);stroke-width:3" />
</svg>
</section>
<section>
<h3>SELECT Complexity</h3>
<svg width=800 height=600>
<image xlink:href="graphics/select_percent_simple_cdf_by_app.png"
x="40" y="50"
width="720" height="432"
/>
<line class="fragment" data-fragment-index="1" x1="620" y1="115" x2="705" y2="102" style="stroke:rgb(0,0,0);stroke-width:3" />
<ellipse class="fragment" data-fragment-index="1" cx="725" cy="110" rx="20" ry="50"
style="fill:none;stroke:rgb(200,50,50);stroke-width:8" />
<text class="fragment" data-fragment-index="1" x=200 y=130>24 / 179 apps using SQLite</text>
<text class="fragment" data-fragment-index="1" x=260 y=175>only as a K/V Store</text>
</svg>
</section>
<section>
<h3>SELECT Complexity</h3>
<pre><code>
INSERT OR REPLACE INTO
properties(property_key,property_value)
VALUES (?,?);
</code></pre>
<pre><code>
SELECT property_value
FROM properties
WHERE property_key=?;
</code></pre>
(These are actual queries from the trace)
</section>
<section>
<h3>SELECT Complexity</h3>
<svg width=800 height=600>
<image xlink:href="graphics/All_Devices__All_Apps__All_Queries__AllRowcountCDFGraph.png"
x="50" y="-10"
width="696" height="560"
/>
<line class="fragment" data-fragment-index="1" x1="250" y1="300" x2="200" y2="180" style="stroke:rgb(0,0,0);stroke-width:3" />
<ellipse class="fragment" data-fragment-index="1" cx="185" cy="150" rx="20" ry="70"
style="fill:none;stroke:rgb(200,50,50);stroke-width:8" />
<text class="fragment" data-fragment-index="1" x=250 y=330>80% of selects</text>
<text class="fragment" data-fragment-index="1" x=250 y=375>return one row</text>
<line class="fragment" data-fragment-index="2" x1="500" y1="100" x2="470" y2="55" style="stroke:rgb(0,0,0);stroke-width:3" />
<ellipse class="fragment" data-fragment-index="2" cx="450" cy="35" rx="70" ry="20"
style="fill:none;stroke:rgb(200,50,50);stroke-width:8" />
<text class="fragment" data-fragment-index="2" x=360 y=130>Small % of SELECTs</text>
<text class="fragment" data-fragment-index="2" x=360 y=175>return 100s of rows</text>
</svg>
</section>
<section>
<h3>SELECT Complexity</h3>
<svg width=800 height=600>
<image xlink:href="graphics/All_Devices__Top_10__All_Queries__ByAppRowcountCDFGraph_noKey.png"
x="50" y="-10"
width="696" height="560"
/>
<line class="fragment" data-fragment-index="1" x1="455" y1="150" x2="440" y2="120" style="stroke:rgb(0,0,0);stroke-width:3" />
<ellipse class="fragment" data-fragment-index="1" cx="400" cy="85" rx="70" ry="40"
style="fill:none;stroke:rgb(200,50,50);stroke-width:8" />
<text class="fragment" data-fragment-index="1" x=460 y=180>Google+,</text>
<text class="fragment" data-fragment-index="1" x=460 y=225>GMail,</text>
<text class="fragment" data-fragment-index="1" x=460 y=270>Facebook,</text>
<text class="fragment" data-fragment-index="1" x=460 y=315>Contacts</text>
</svg>
</section>
</section>
<section>
<section>
<ul>
<li>SELECT Complexity</li>
<li style="font-weight: bold; font-size: 125%;">ORM Effects</li>
<li>Function Usage</li>
<li>Read/Write Ratios</li>
<li>Query Periodicity</li>
</ul>
</section>
<section>
<img src="graphics/orm.png" style="float:left; " height=400/>
<div style="margin-top: 60px;">
<pre style="width: 400px" class="fragment"><code class="hljs ruby" data-trim>
pers = Persons.get(10)
name = pers.firstName()
</code></pre>
</div>
<div style="margin-top: 180px;">
<pre style="width: 400px" class="fragment"><code data-trim>
SELECT first_name
FROM Persons
WHERE id = 10;
</code></pre>
<br/>
<p class="fragment"><b>SQL DB persists objects between app runs</b></p>
</section>
<section>
<img src="graphics/orm.png" style="float:left; " height=400/>
<div style="margin-top: 40px;">
<pre style="width: 400px" class="fragment" data-fragment-index="1"><code class="hljs ruby" data-trim>
pers = Persons.get(10)
org = pers.employer()
name = org.name()
</code></pre>
</div>
<div style="margin-top: 110px;">
<pre style="width: 400px" class="fragment" data-fragment-index="2"><code data-trim>
SELECT employer_id
FROM Persons
WHERE id = 10;
</code></pre>
<pre style="width: 400px" class="fragment" data-fragment-index="2"><code data-trim>
SELECT name
FROM Organizations
WHERE id = ?;
</code></pre>
<br/>
<p class="fragment" data-fragment-index="2"><b>ORMs are not always efficient</b></p>
</section>
<section>
<img src="graphics/orm.png" style="float:left; " height=400/>
<div style="margin-top: 40px;">
<pre style="width: 400px" class="fragment" data-fragment-index="1"><code class="hljs ruby" data-trim>
pers = Persons.get(10)
pers.setSalary(
pers.salary() * 1.1
) </code></pre>
</div>
<div style="margin-top: 100px;">
<pre style="width: 400px" class="fragment" data-fragment-index="2"><code data-trim>
SELECT salary
FROM Persons
WHERE id = 10;
</code></pre>
<pre style="width: 400px" class="fragment" data-fragment-index="2"><code data-trim>
UPDATE Persons
SET salary = ?
WHERE id = 10;
</code></pre>
<br/>
<p class="fragment" data-fragment-index="3"><b>We saw NO update value computations in SQL</b></p>
</section>
<section>
<img src="graphics/orm.png" style="float:left; " height=400/>
<div style="margin-top: 40px;">
<pre style="width: 400px"><code class="hljs ruby" data-trim>
pers = Persons.get(10)
pers.setSalary(
pers.salary() * 1.1
) </code></pre>
</div>
<div style="margin-top: 100px;">
<pre style="width: 400px"><code data-trim>
SELECT salary
FROM Persons
WHERE id = 10;
</code></pre>
<pre style="width: 400px"><code data-trim>
INSERT OR REPLACE Persons
SET salary = ?
WHERE id = 10;
</code></pre>
<br/>
<p><b>"Insert or Replace" used very frequently</b></p>
</section>
</section>
<section>
<section>
<ul>
<li>SELECT Complexity</li>
<li>ORM Effects</li>
<li style="font-weight: bold; font-size: 125%;">Function Usage</li>
<li>Read/Write Ratios</li>
<li>Query Periodicity</li>
</ul>
</section>
<section>
<h3>Aggregate Functions</h3>
<table>
<tr><th>Function</th><th>Call Sites</th></tr>
<tr><td><code>GROUP_CONCAT</code></td><td>583,474</td></tr>
<tr><td><code>SUM</code></td><td>321,387</td></tr>
<tr><td><code>MAX</code></td><td>314,970</td></tr>
<tr><td><code>COUNT</code></td><td>173,031</td></tr>
<tr><td><code>MIN</code></td><td>19,566</td></tr>
<tr><td><code>AVG</code></td><td>15</td></tr>
</table>
<p>Aggregates by-far the most common function type</p>
</section>
<section>
<h3>Aggregate Functions</h3>
<table>
<tr><th>Function</th><th>Call Sites</th></tr>
<tr><td><b>GROUP_CONCAT</b></td><td>583,474</td></tr>
<tr><td><code>SUM</code></td><td>321,387</td></tr>
<tr><td><code>MAX</code></td><td>314,970</td></tr>
<tr><td><code>COUNT</code></td><td>173,031</td></tr>
<tr><td><code>MIN</code></td><td>19,566</td></tr>
<tr><td><code>AVG</code></td><td>15</td></tr>
</table>
<p>Non-algebraic column-wise string concatenation</p>
</section>
<section>
<h3>Other Functions</h3>
<br/>
<p class="fragment">Mostly string manipulation (<code>length, substr</code>)</p>
<br/>
<p class="fragment">Some Android-Specific (<code>phone_numbers_equal</code>)</p>
<br/>
<p class="fragment"><b>NO UDFs</b> at all</p>
</section>
</section>
<section>
<section>
<ul>
<li>SELECT Complexity</li>
<li>ORM Effects</li>
<li>Function Usage</li>
<li style="font-weight: bold; font-size: 125%;">Read/Write Ratios</li>
<li>Query Periodicity</li>
</ul>
</section>
<section>
<h3>Reads vs Writes</h3>
<svg width=800 height=500>
<image xlink:href="graphics/read_write_ratio_cdf_by_app.png"
x="25" y="50"
width="750" height="450"
/>
<line class="fragment" data-fragment-index="1" x1="620" y1="115" x2="715" y2="102" style="stroke:rgb(0,0,0);stroke-width:3" />
<ellipse class="fragment" data-fragment-index="1" cx="735" cy="110" rx="20" ry="50"
style="fill:none;stroke:rgb(200,50,50);stroke-width:8" />
<text class="fragment" data-fragment-index="1" x=280 y=120>~15% of apps do not</text>
<text class="fragment" data-fragment-index="1" x=270 y=165>perform a single write!</text>
<line class="fragment" data-fragment-index="2" x1="350" y1="310" x2="405" y2="345" style="stroke:rgb(0,0,0);stroke-width:3" />
<ellipse class="fragment" data-fragment-index="2" cx="430" cy="365" rx="30" ry="30"
style="fill:none;stroke:rgb(200,50,50);stroke-width:8" />
<text class="fragment" data-fragment-index="2" x=150 y=260>only ~15% of apps write</text>
<text class="fragment" data-fragment-index="2" x=160 y=305>more than they read!</text>
</svg>
</section>
<section>
<h3>Read-Only Workloads</h3>
<br/>
<h4 class="fragment" data-fragment-index="1">JuiceSSH, Key Chain</h4>
<ul class="fragment" data-fragment-index="3"><li>Credential store, infrequent writes</li></ul>
<br/><br/>
<h4 class="fragment" data-fragment-index="2">Google Play Newsstand, Eventbrite, ...</h4>
<ul>
<li class="fragment" data-fragment-index="4">Frequent queries over changing data</li>
<li class="fragment" data-fragment-index="5">Data bulk updated by copying <b>entire SQLite DB</b></li>
</ul>
</section>
</section>
<section>
<section>
<ul>
<li>SELECT Complexity</li>
<li>ORM Effects</li>
<li>Function Usage</li>
<li>Read/Write Ratios</li>
<li style="font-weight: bold; font-size: 125%;">Query Periodicity</li>
</ul>
</section>
<section>
<h3>Query Arrival Frequency</h3>
<svg width=800 height=430>
<image xlink:href="graphics/All_Devices__All_Apps__All_Queries__AllPreviousQueryCDFGraph.png"
x="135" y="20"
width="510" height="410"
/>
</svg>
<p class="fragment"><b>15-20% of queries arrive ~10ms after last query.</b></p>
</section>
<section>
<h3>... By Query Type</h3>
<svg width=800 height=500>
<image xlink:href="graphics/All_Devices__All_Apps__All_Queries__ByTypeNextQueryCDFGraph.png"
x="0" y="100"
width="400" height="322"
/>
<image xlink:href="graphics/All_Devices__All_Apps__All_Queries__ByTypePreviousQueryCDFGraph.png"
x="400" y="100"
width="400" height="322"
/>
<text class="fragment" data-fragment-index="1" x=20 y=40>70% of inserts come less than</text>
<text class="fragment" data-fragment-index="1" x=20 y=80>0.1 ms before another query</text>
<line class="fragment" data-fragment-index="1" x1="100" y1="85" x2="120" y2="165" style="stroke:rgb(0,0,0);stroke-width:3" />
<ellipse class="fragment" data-fragment-index="1" cx="130" cy="190" rx="30" ry="30"
style="fill:none;stroke:rgb(200,50,50);stroke-width:8" />
<text class="fragment" data-fragment-index="2" x=400 y=440>Most sequences consist</text>
<text class="fragment" data-fragment-index="2" x=400 y=480>of INSERTs and SELECTs</text>
<line class="fragment" data-fragment-index="2" x1="450" y1="410" x2="525" y2="250" style="stroke:rgb(0,0,0);stroke-width:3" />
<ellipse class="fragment" data-fragment-index="2" cx="530" cy="220" rx="30" ry="30"
style="fill:none;stroke:rgb(200,50,50);stroke-width:8" />
</svg>
</section>
<section>
<h3>... By App</h3>
<svg width=800 height=500>
<image xlink:href="graphics/All_Devices__Top_10__All_Queries__ByAppPreviousQueryCDFGraph.png"
x="135" y="20"
width="510" height="410"
/>
<text class="fragment" data-fragment-index="1" style="font-size: 70%" x=10 y=125>Google Play</text>
<text class="fragment" data-fragment-index="1" style="font-size: 70%" x=10 y=155>Services and</text>
<text class="fragment" data-fragment-index="1" style="font-size: 70%" x=10 y=185>Media Storage</text>
<text class="fragment" data-fragment-index="1" style="font-size: 70%" x=10 y=215>are bursty</text>
<line class="fragment" data-fragment-index="1" x1="175" y1="180" x2="270" y2="190" style="stroke:rgb(0,0,0);stroke-width:3" />
<ellipse class="fragment" data-fragment-index="1" cx="300" cy="200" rx="30" ry="30"
style="fill:none;stroke:rgb(200,50,50);stroke-width:8" />
<text class="fragment" data-fragment-index="2" style="font-size: 70%" x=570 y=225>Same 10 ms</text>
<text class="fragment" data-fragment-index="2" style="font-size: 70%" x=570 y=255>periodicity</text>
<text class="fragment" data-fragment-index="2" style="font-size: 70%" x=570 y=285>evident across</text>
<text class="fragment" data-fragment-index="2" style="font-size: 70%" x=570 y=315>all apps</text>
<line class="fragment" data-fragment-index="2" x1="565" y1="260" x2="420" y2="220" style="stroke:rgb(0,0,0);stroke-width:3" />
<ellipse class="fragment" data-fragment-index="2" cx="390" cy="200" rx="30" ry="90"
style="fill:none;stroke:rgb(200,50,50);stroke-width:8" />
</svg>
</section>
</section>
<section>
<section>
<h3>Overview</h3>
<ul>
<li>Mobile phones process ~2 queries/second<ul>
<li>DB performance important for power, latency, ...</li>
</ul></li>
<li>Embedded DBs used differently than Server DBs.<ul>
<li>We need to understand these access patterns before we can optimize for them.</li>
</ul></li>
</ul>
</section>
<section>
<h3>What's Next?</h3>
<ul>
<li class="fragment">Bigger Sample Sizes - All 200 participants?</li>
<li class="fragment">Better Instrumentation - Application Code, Filesystems?</li>
<li class="fragment">Semantic Analysis - What are the queries actually asking?</li>
<li class="fragment">ORM Integration - Opportunities for improvement?</li>
<li class="fragment"><b>The PocketData Benchmark</b></li>
</ul>
</section>
<section>
<h3>The PocketData Benchmark</h3>
<ul>
<li>Modular: Apps as bags of persistent datastructures.</li>
<li>Testing under normal load rather than saturation.</li>
<li>Metrics like power &amp; cpu/memory resource use.</li>
<li>Accounting for background resource use.</li>
<li>Mixed-bag workloads (Key/Value+OLAP+OLTP).</li>
<li>Evaluate Best Execution of Programmer Intent.</li>
</ul>
</section>
<section>
<h3>You Can Help!</h3>
<p>Let us know how you would use PocketData!</p>
<p><a href="mailto:okennedy@buffalo.edu">okennedy@buffalo.edu</a></p>
</section>
</section>
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