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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=2">
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</script>
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<time title="创建时间：2024-06-19 11:24:18 / 修改时间：11:32:36" itemprop="dateCreated datePublished" datetime="2024-06-19T11:24:18+08:00">2024-06-19</time>
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<p>在 mac 上跑程序的时候看到日志里报错</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">failed to open file due to Too many open files.</span><br></pre></td></tr></table></figure>
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<a href="/2024/05/20/How-to-adjust-the-size-of-mermaid-graph-in-Obsidian/" class="post-title-link" itemprop="url">How to adjust the size of mermaid graph in Obsidian</a>
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<time title="创建时间：2024-05-20 14:27:46 / 修改时间：15:06:41" itemprop="dateCreated datePublished" datetime="2024-05-20T14:27:46+08:00">2024-05-20</time>
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<span>1 分钟</span>
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<h3 id="Description">Description</h3>
<p>在写上一篇 blog 的时候因为用到了 mermaid 来画流程图，但是在使用过程中发现了一个问题，就是 mermaid 画出来的流程图显示不全。</p>
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<a href="/2024/05/17/Gorilla-A-Fast-Scalable-In-Memory-Time-Series-Database/" class="post-title-link" itemprop="url">Gorilla: A Fast, Scalable, In-Memory Time Series Database</a>
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<time title="创建时间：2024-05-17 14:20:04" itemprop="dateCreated datePublished" datetime="2024-05-17T14:20:04+08:00">2024-05-17</time>
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<time title="修改时间：2024-05-30 14:52:32" itemprop="dateModified" datetime="2024-05-30T14:52:32+08:00">2024-05-30</time>
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<span>10 分钟</span>
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<h3 id="ABSTRACT">ABSTRACT</h3>
<p>摘要部分大概介绍了一下 TSDB(time series database) 应用的场景，引出 Facebook 的 in-memory 的时序数据库 Gorilla。作者的想法是用户比起单个数据点更侧重于数据的聚合分析，并且对于诊断和分析线上问题的场景来说，新的数据点比旧的数据点更有价值。Gorilla 为了优化查询性能，采用了激进的压缩方法，比如<code>delta-of-delta timestamps</code> 和 <code>XOR'd floating point values</code>，这使得其内存消耗缩小了 10 倍，由此可以将数据放在内存中。相比于 HBase 的存储方案，Gorilla 的查询延迟减少 73 倍，吞吐量提升了 14 倍。</p>
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<time title="创建时间：2024-05-14 17:43:47" itemprop="dateCreated datePublished" datetime="2024-05-14T17:43:47+08:00">2024-05-14</time>
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<h3 id="Prior-knowledge-about-index">Prior knowledge about index</h3>
<h4 id="What-is-relfilenode">What is relfilenode:</h4>
<p>pg_class 里面有一列叫 relfilenode , pg 官方的文档对这列的解释是：</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">Name of the on-disk file of this relation; zero means this is a "mapped" relation whose disk file name is determined by low-level state</span><br></pre></td></tr></table></figure>
<p>也就是这个值表示 pg_class 里面某个对象在磁盘上存储的文件名。</p>
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