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                            <article id="post-9424" class="post-9424 post type-post status-publish format-standard hentry category-bigdata tag-117 tag-mpp tag-121 tag-125 tag-119 tag-120 tag-123 tag-124 tag-122 entry">
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                            <h1 class="entry-title">hadoop环境运行程序出现 Retrying connect to server 问题详解大数据</h1>
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                                                                <time class="entry-date published" datetime="2021-07-19T11:11:25+08:00" pubdate>
                                    2021年7月19日 11:11                                </time>
                                <span class="dot">•</span>
                                <a href="https://blog.ytso.com/category/tech/bigdata" rel="category tag">大数据</a>                                                            </div>
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                            <p>程序运行时出现如下问题：</p>
<p><noscript><img decoding="async" src="http://blog.ytso.com/zb_users/plugin/LazyLoad/usr/loading.gif" data-original="/img/130281420180107211108253932569776.png" alt="hadoop环境运行程序出现 Retrying connect to server 问题详解大数据"></noscript><img decoding="async" class="j-lazy" src="https://blog.ytso.com/wp-content/themes/justnews/themer/assets/images/lazy.png" data-original="http://blog.ytso.com/zb_users/plugin/LazyLoad/usr/loading.gif" data-original="/img/130281420180107211108253932569776.png" alt="hadoop环境运行程序出现 Retrying connect to server 问题详解大数据"></p>
<p>从网上查资料，有说重启format的。。有说/etc/hosts出问题的。。。</p>
<p>反正都试了一遍。。还是有这个问题</p>
<p>后来看日志，发现问题是访问服务器9001端口访问不到。。开始怀疑自己配置文件有问题。既然是9001，那就肯定是mapred的问题，</p>
<p>看了配置文件内容</p>
<div class="cnblogs_code">
<pre class="prism-language-java">    　　<span style="color: #0000ff">&lt;</span><span style="color: #800000">property</span><span style="color: #0000ff">&gt;</span> 
                <span style="color: #0000ff">&lt;</span><span style="color: #800000">name</span><span style="color: #0000ff">&gt;</span>mapred.job.tracker<span style="color: #0000ff">&lt;/</span><span style="color: #800000">name</span><span style="color: #0000ff">&gt;</span> 
                <span style="color: #0000ff">&lt;</span><span style="color: #800000">value</span><span style="color: #0000ff">&gt;http://</span>192.168.254.128:9001<span style="color: #0000ff">&lt;/</span><span style="color: #800000">value</span><span style="color: #0000ff">&gt;</span> 
        <span style="color: #0000ff">&lt;/</span><span style="color: #800000">property</span><span style="color: #0000ff">&gt;</span></pre>
</div>
<p>也没发现有什么问题，ip换成host中的master也不行，看官方配置文档，发现没有http，删掉http之后，重启dataNode没了0.0</p>
<p>日志说有冲突什么的。。。估计就是format问题。。清理了tmp和hdfs，重新format，然后再启动，成功！</p>
<p>附上一份正确的配置</p>
<div class="cnblogs_code">
<pre class="prism-language-java">　    <span style="color: #0000ff">&lt;</span><span style="color: #800000">property</span><span style="color: #0000ff">&gt;</span> 
                <span style="color: #0000ff">&lt;</span><span style="color: #800000">name</span><span style="color: #0000ff">&gt;</span>mapred.job.tracker<span style="color: #0000ff">&lt;/</span><span style="color: #800000">name</span><span style="color: #0000ff">&gt;</span> 
                <span style="color: #0000ff">&lt;</span><span style="color: #800000">value</span><span style="color: #0000ff">&gt;</span>192.168.254.128:9001<span style="color: #0000ff">&lt;/</span><span style="color: #800000">value</span><span style="color: #0000ff">&gt;</span> 
        <span style="color: #0000ff">&lt;/</span><span style="color: #800000">property</span><span style="color: #0000ff">&gt;</span></pre>
</div>
<p>&nbsp;</p>
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