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<h1 id="Rebalance问题处理"><a href="#Rebalance问题处理" class="headerlink" title="Rebalance问题处理"></a>Rebalance问题处理</h1><p>最近有个项目，过一段时间就出出现如下问题，现象为offset不再提交，但是观察log数据发现数据还有在消费。</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">Attempt to heartbeat failed since group is rebalancing</span><br></pre></td></tr></table></figure>
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<h1 id="HTTP-Sink-配置"><a href="#HTTP-Sink-配置" class="headerlink" title="HTTP Sink 配置"></a>HTTP Sink 配置</h1><h2 id="最少配置"><a href="#最少配置" class="headerlink" title="最少配置"></a>最少配置</h2><figure class="highlight json"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line">{</span><br><span class="line"> <span class="attr">"connector.class"</span>: <span class="string">"io.confluent.connect.http.HttpSinkConnector"</span>,</span><br><span class="line"> <span class="attr">"http.api.url"</span>: <span class="string">"http://localhost:8288/api/messages"</span>,</span><br><span class="line"> <span class="attr">"request.method"</span>: <span class="string">"POST"</span>,</span><br><span class="line"> <span class="attr">"topics"</span>: <span class="string">"REASON_HTTP"</span>,</span><br><span class="line"> <span class="attr">"tasks.max"</span>: <span class="string">"1"</span>,</span><br><span class="line"> <span class="attr">"request.body.format"</span>: <span class="string">"json"</span>,</span><br><span class="line"> <span class="attr">"confluent.topic.bootstrap.servers"</span>: <span class="string">"localhost:9092"</span>,</span><br><span class="line"> <span class="attr">"key.converter.schemas.enable"</span>: <span class="string">"false"</span>,</span><br><span class="line"> <span class="attr">"value.converter.schemas.enable"</span>: <span class="string">"false"</span>,</span><br><span class="line"> <span class="attr">"key.converter"</span>: <span class="string">"org.apache.kafka.connect.storage.StringConverter"</span>,</span><br><span class="line"> <span class="attr">"value.converter"</span>: <span class="string">"org.apache.kafka.connect.json.JsonConverter"</span></span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<h2 id="窗口类型"><a href="#窗口类型" class="headerlink" title="窗口类型"></a>窗口类型</h2><ul>
<li><strong>Hopping Window</strong> 固定时间，重叠窗口</li>
<li><strong>Tumbling Window</strong> 固定时间，不重叠，无间隙的滚动窗口</li>
<li><strong>Session Window</strong> 动态大小，不重叠的数据驱动窗口</li>
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<p><img src="https://docs.ksqldb.io/en/latest/img/ksql-window-aggregation.png" alt="avatar"></p>
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<h2 id="除法问题"><a href="#除法问题" class="headerlink" title="除法问题"></a>除法问题</h2><ul>
<li>double 类型除不尽时结果为null</li>
<li>复杂计算时，先乘再除</li>
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<h2 id="数据处理"><a href="#数据处理" class="headerlink" title="数据处理"></a>数据处理</h2><ul>
<li>如果有多个job同时处理一个大的数据流，可以先对数据流进行清洗，对提升性能有明显效果。</li>
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<h1 id="场景"><a href="#场景" class="headerlink" title="场景"></a>场景</h1><p>最近公司在做redis规范，其中有一条就是禁用或者重命名CONFIG命令，然后在部署Redis Sentinel的时候也傻乎乎的就把CONFIG命令给重命名了。今天在查看相关文档时，发现sentinel在做节点管理时会使用CONFIG命令。按照这个逻辑，如果重命名CONFIG命令会导致无法实现故障转移。</p>
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<p>随着公司Redis使用规模越来越大，redis安全也展现出来了，所以我们经过分析研究做出如下总结。</p>
<p><strong>Redis在部署时，需要满足一下条件则会变得更加安全：</strong></p>
<h2 id="禁止root用户启动redis"><a href="#禁止root用户启动redis" class="headerlink" title="禁止root用户启动redis"></a>禁止root用户启动redis</h2><p>为 Redis 服务创建单独的用户和home目录，使用普通用户启动，安全性往往高很多。</p>
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<h2 id="Redis部署机器最佳系统优化实践执行内容"><a href="#Redis部署机器最佳系统优化实践执行内容" class="headerlink" title="Redis部署机器最佳系统优化实践执行内容"></a>Redis部署机器最佳系统优化实践执行内容</h2><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line">vi /etc/sysctl.conf</span><br><span class="line">vm.swappiness = 0</span><br><span class="line">vm.overcommit_memory = 1</span><br><span class="line">net.core.somaxconn = 65535</span><br><span class="line">net.core.netdev_max_backlog = 262144</span><br><span class="line"></span><br><span class="line"># 立即生效</span><br><span class="line">sysctl -p</span><br><span class="line"># 查看</span><br><span class="line">cat /proc/sys/vm/overcommit_memory</span><br><span class="line"></span><br><span class="line">vi /etc/rc.local</span><br><span class="line">if test -f /sys/kernel/mm/transparent_hugepage/enabled; then</span><br><span class="line"> echo 'never' > /sys/kernel/mm/transparent_hugepage/enabled</span><br><span class="line">fi</span><br><span class="line">if test -f /sys/kernel/mm/transparent_hugepage/defrag; then</span><br><span class="line"> echo 'never' > /sys/kernel/mm/transparent_hugepage/defrag</span><br><span class="line">fi</span><br><span class="line"></span><br><span class="line">echo never > /sys/kernel/mm/transparent_hugepage/enabled</span><br></pre></td></tr></table></figure>
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<p>Dockerfile是一种文本文档，其中包含用户在命令行上可以调用的所有命令，使用这些命令来组装Image。</p>
<h2 id="最简单的Dockerfile"><a href="#最简单的Dockerfile" class="headerlink" title="最简单的Dockerfile"></a>最简单的Dockerfile</h2><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">#Version: 0.01</span></span><br><span class="line">FROM anapsix/alpine-java:8 <span class="comment">#基于哪个镜像</span></span><br><span class="line">MAINTAINER reason.h.duan <span class="comment">#作者</span></span><br><span class="line">RUN mkdir /opt/rest_demo <span class="comment">#创建一个工作目录，不创建不能上传文件到此目录</span></span><br><span class="line">ADD RestDemo.jar /opt/rest_demo <span class="comment">#上传自己的文件</span></span><br><span class="line">ADD start.sh /opt/rest_demo</span><br><span class="line">WORKDIR /opt/rest_demo <span class="comment">#设置工作目录</span></span><br><span class="line">ENTRYPOINT [<span class="string">"./start.sh"</span>] <span class="comment">#设置容器启动执行脚本</span></span><br><span class="line"></span><br></pre></td></tr></table></figure>
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<p>Docker多阶段构建可以在构建镜像时，只使用工具镜像，但是不将工具镜像的内容打包到最终镜像中。这个可以减少镜像的最终大小。</p>
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