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                        <h1 class="page-title"><a href="/show-203667178.html" title="【3.1】MapReduce框架原理之InputFormat数据输入">【3.1】MapReduce框架原理之InputFormat数据输入</a></h1>
            
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                <time class="post-date" datetime="2021-05-08">2021-05-08</time>
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<h4>
<a target="_blank" rel="nofollow"></a>1. 切片与 MapTask并行度决定机制</h4>
<ol>
<li>问题引出<br>
MapTask的并行度决定 Map阶段的任务处理并发度，进而影响到整个Job的处理速度。<br><img alt="【3.1】MapReduce框架原理之InputFormat数据输入" src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpVMUx6QXhOek5sWW1RM00yTmxNR1U0WkRNek9XUm1ZMlF3WTJWaE1XWTRabUUzTG5CdVp3PT0=" title="【3.1】MapReduce框架原理之InputFormat数据输入">
</li>
<li>MapTask并行度决定机制<br><img alt="【3.1】MapReduce框架原理之InputFormat数据输入" src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpNek1pOHpOREUwTVRKak5EYzVaakU1TnpoalltSmlNVE16TkRJMU16RTRNMlEzWXk1d2JtYz0=" title="【3.1】MapReduce框架原理之InputFormat数据输入"><br><mark>数据切片与MapTask并行度决定机制</mark><img alt="【3.1】MapReduce框架原理之InputFormat数据输入" src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpjM05DOWhPVEkyWmpOa01XUmxZbUk0WkdNelptRmxaR1JpWlRJell6WTRPRFV3Tmk1d2JtYz0=" title="【3.1】MapReduce框架原理之InputFormat数据输入">
</li>
</ol>
<h4>
<a target="_blank" rel="nofollow"></a>2. Job 提交流程源码和切片源码详解</h4>
<ol>
<li>
<p><mark>Job提交流程</mark><br><img alt="【3.1】MapReduce框架原理之InputFormat数据输入" src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpRd01DOHlZVFptTkRFMFpqUXlNR0ZpWVRrMU5qVm1aakF5WldSalpEVm1OMll5T0M1d2JtYz0=" title="【3.1】MapReduce框架原理之InputFormat数据输入"><br><mark>源码详解</mark><br><img alt="【3.1】MapReduce框架原理之InputFormat数据输入" src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpJd01DODFOREZqTVRGbVlUZzRObVEzTm1NNU9XUTFOREJoT1RJMk9EWmxZelZsTUM1d2JtYz0=" title="【3.1】MapReduce框架原理之InputFormat数据输入"><img alt="【3.1】MapReduce框架原理之InputFormat数据输入" src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpjNE5DOHpNREpsWkdJeU9HUTFZV1F4TlRkak1ETmpZbVV3TmpKak1HUmpZbU0wT0M1d2JtYz0=" title="【3.1】MapReduce框架原理之InputFormat数据输入"><br><img alt="【3.1】MapReduce框架原理之InputFormat数据输入" src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpZM09DODJOamt6TlRsa09EVTFORGRrTVRCak1UZzRaalEyTXpOalltSXpaalptTmk1d2JtYz0=" title="【3.1】MapReduce框架原理之InputFormat数据输入"></p>
</li>
<li>
<p><strong>FileInputFormat <mark>切片源码</mark>解析(input.getSplits(job))</strong><br><img alt="【3.1】MapReduce框架原理之InputFormat数据输入" src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpjeU1DOWpPVEEwWXpjM1ltTmtOREZoWVdGbE1UVXlZakpsTVRoak56UTVNbVUwT0M1d2JtYz0=" title="【3.1】MapReduce框架原理之InputFormat数据输入"></p>
</li>
</ol>
<h4>
<a target="_blank" rel="nofollow"></a>3. FileInputFormat 切片机制</h4>
<ol>
<li>
<mark>切片机制</mark><img alt="【3.1】MapReduce框架原理之InputFormat数据输入" src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpVMUwySmpOR1k0TUdGaU9HWmtaRGsyTldRd1pUVTJOemxqTmpNek0yRXhNelZtTG5CdVp3PT0=" title="【3.1】MapReduce框架原理之InputFormat数据输入">
</li>
<li>
<mark>案例分析</mark><br><img alt="【3.1】MapReduce框架原理之InputFormat数据输入" src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpjeU9DOHhPREZoTWpaaU9ERmhNV1ExTVdVNFlqZGxNVGcxWXpFMk9XVXdNVGd4TUM1d2JtYz0=" title="【3.1】MapReduce框架原理之InputFormat数据输入">
</li>
<li>
<mark>FileInputFormat切片大小的参数配置</mark><img alt="【3.1】MapReduce框架原理之InputFormat数据输入" src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpjME5DOWxOek14TmpRMU9HWTFPR1pqT0dVd1pEYzNZamt6T1RCa05tRm1ZalF4TUM1d2JtYz0=" title="【3.1】MapReduce框架原理之InputFormat数据输入">
</li>
</ol>
<h4>
<a target="_blank" rel="nofollow"></a>4.CombineTextInputFormat 切片机制<img alt="【3.1】MapReduce框架原理之InputFormat数据输入" src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpFM015ODVZbVEyT0RsbU9HRmtOalZpWkdZeU5EbGtPRFkwWm1JNFpEY3laRGRsTlM1d2JtYz0=" title="【3.1】MapReduce框架原理之InputFormat数据输入">
</h4>
<ol>
<li>应用场景：<br><img alt="【3.1】MapReduce框架原理之InputFormat数据输入" src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpjNUwyWTFORGRsTW1KbU0ySTRZemsyTVRnNE5XRmlNREZqTWpneU9HTmxNemRtTG5CdVp3PT0=" title="【3.1】MapReduce框架原理之InputFormat数据输入">
</li>
<li>虚拟存储切片最大值设置<br><img alt="【3.1】MapReduce框架原理之InputFormat数据输入" src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpnek9DOWxNemRsT0dGbVpUTTVObU0zWkRobVlqaGhaVGxoTkRWaFpqUmlNV1ZoWlM1d2JtYz0=" title="【3.1】MapReduce框架原理之InputFormat数据输入">
</li>
<li>
<mark>CombineTextInputFormat切片机制</mark><br>
生成切片过程包括：虚拟存储过程和切片过程二部分。<br><img alt="【3.1】MapReduce框架原理之InputFormat数据输入" src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpjeU55OHdZak01TjJRMU1UWTFZamMwWVRFMk9EZzNNMlk0TlRJNU9HWTBZbVUwTnk1d2JtYz0=" title="【3.1】MapReduce框架原理之InputFormat数据输入"><br>
（1）虚拟存储过程<br><img alt="【3.1】MapReduce框架原理之InputFormat数据输入" src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpjNE5TODNaV0ZsTkROaE5UVXlaREUxWkRnMlpqWXhaVFV3TVRJMVl6UTROemMwT1M1d2JtYz0=" title="【3.1】MapReduce框架原理之InputFormat数据输入"><br>
（2）切片过程：<br><img alt="【3.1】MapReduce框架原理之InputFormat数据输入" src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpJeE9DOWxNRGRsWmpCbVpHWmhPR00xWm1WaU1USTBNMlZoWWpaaU9XTTNOekJpTWk1d2JtYz0=" title="【3.1】MapReduce框架原理之InputFormat数据输入">
</li>
</ol>
<h4>
<a target="_blank" rel="nofollow"></a>5. CombineTextInputFormat案例实操</h4>
<ol>
<li>需求<br>
将输入的大量小文件合并成一个切片统一处理 。<br><img alt="【3.1】MapReduce框架原理之InputFormat数据输入" src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpnNE1pOWpOamd6WWpWak4yWmxaREF5WVdabU1XWTNaamMzTmpjM1ptRmpORGc0WVM1d2JtYz0=" title="【3.1】MapReduce框架原理之InputFormat数据输入">
</li>
<li>实现过程<br><img alt="【3.1】MapReduce框架原理之InputFormat数据输入" src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpneE5TODBOR015TjJKa1pEZGtNekE0TVdJNU9XRmhaalZqWVdOaU9HVmpOall3Tnk1d2JtYz0=" title="【3.1】MapReduce框架原理之InputFormat数据输入">
</li>
</ol>
<h4>
<a target="_blank" rel="nofollow"></a>6. FileInputFormat 实现类</h4>
<p><img alt="【3.1】MapReduce框架原理之InputFormat数据输入" src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THprNU9TODRZVFUyWXpkaFpXUXlNalEyTldJM00yWmxaV1kzTnpReE1XTTVNV1l5Tnk1d2JtYz0=" title="【3.1】MapReduce框架原理之InputFormat数据输入"></p>
<ol>
<li>TextInputFormat<br><img alt="【3.1】MapReduce框架原理之InputFormat数据输入" src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpNME1DOHdaRFJsTWpjME5XTmpOV1l4TVdRNE4yTXlZV1JsTkdSak5UTmxNak0yTkM1d2JtYz0=" title="【3.1】MapReduce框架原理之InputFormat数据输入">
</li>
<li>KeyValueTextInputFormat<img alt="【3.1】MapReduce框架原理之InputFormat数据输入" src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpRd0x6STBObVk0WldNMFptSTFZVFV3WXpNMFl6TTFOV001TkRKaVpEUmhZakU0TG5CdVp3PT0=" title="【3.1】MapReduce框架原理之InputFormat数据输入">
</li>
<li>NLineInputFormat<br><img alt="【3.1】MapReduce框架原理之InputFormat数据输入" src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpJM05DOHdaamRsTlRjNVpETmtZVGhqTXpjNU5tRm1OR1V4TVdWak5HVXhZMk5sWVM1d2JtYz0=" title="【3.1】MapReduce框架原理之InputFormat数据输入">
</li>
<li>自定义InputFormat<br><img alt="【3.1】MapReduce框架原理之InputFormat数据输入" src="/default/index/img?u=L2RlZmF1bHQvaW5kZXgvaW1nP3U9YUhSMGNITTZMeTl3YVdGdWMyaGxiaTVqYjIwdmFXMWhaMlZ6THpNeE5TOHhaak5oTjJVMk1UbGlZVGRoTVdabE9HTTFOREl5WTJWalpXVmpaR1kyWWk1d2JtYz0=" title="【3.1】MapReduce框架原理之InputFormat数据输入">
</li>
</ol>
 
                    
            
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