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<a href="/wang.github.io/2019/07/23/sqoop2 客户端从mysql导入数据到hdfs中/" class="post-title-link" itemprop="url">sqoop2 客户端从mysql导入数据到hdfs中</a>
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<time title="Created: 2019-07-23 21:38:43 / Modified: 23:28:29" itemprop="dateCreated datePublished" datetime="2019-07-23T21:38:43+08:00">2019-07-23</time>
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<p>01 启动服务端程序</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">sqoop2-server start</span><br></pre></td></tr></table></figure>
<p>02 客户端启动</p>
<figure class="highlight plain"><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></pre></td><td class="code"><pre><span class="line">#启动客户端窗口命令</span><br><span class="line">sqoop2-shell</span><br><span class="line">#设置服务端地址以及端口号</span><br><span class="line">set server --host localhost --port 12000 --webapp sqoop</span><br><span class="line">#查看连接是否可用</span><br><span class="line">show version --all</span><br></pre></td></tr></table></figure>
<p>03 创建连接</p>
<figure class="highlight plain"><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><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br></pre></td><td class="code"><pre><span class="line">#下面的命令是查看是否连接到服务端</span><br><span class="line">show connector </span><br><span class="line">#通过下面的命令创建一个generic-jdbc-connector连接</span><br><span class="line">sqoop:002> create link -c generic-jdbc-connector</span><br><span class="line">Creating link for connector with name generic-jdbc-connector</span><br><span class="line">Please fill following values to create new link object</span><br><span class="line">Name: mysql_weibouser_link</span><br><span class="line"></span><br><span class="line">Database connection</span><br><span class="line"></span><br><span class="line">Driver class: com.mysql.jdbc.Driver</span><br><span class="line">Connection String: jdbc:mysql://127.0.0.1:3306/subject</span><br><span class="line">Username: root</span><br><span class="line">Password: ******</span><br><span class="line">Fetch Size: </span><br><span class="line">Connection Properties: </span><br><span class="line">There are currently 0 values in the map:</span><br><span class="line">entry# protocol=tcp</span><br><span class="line">There are currently 1 values in the map:</span><br><span class="line">protocol = tcp</span><br><span class="line">entry# </span><br><span class="line"></span><br><span class="line">SQL Dialect</span><br><span class="line"></span><br><span class="line">Identifier enclose: **注意 这里不能直接回车！要打一个空格符号！因为如果不打，查询mysql表的时候会在表上加上“”，导致查询出错！</span><br><span class="line">**</span><br><span class="line">New link was successfully created with validation status OK and name mysql_weibouser_link</span><br><span class="line">再创建一个hdfs的命令</span><br><span class="line">sqoop:002> create link -c hdfs-connector</span><br><span class="line">Creating link for connector with name hdfs-connector</span><br><span class="line">Please fill following values to create new link object</span><br><span class="line">Name: hdfs_weibouser_link</span><br><span class="line"></span><br><span class="line">HDFS cluster</span><br><span class="line"></span><br><span class="line">URI: hdfs://localhost:8020</span><br><span class="line">Conf directory: /soft/hadoop-2.6.0-cdh5.9.3/etc/hadoop</span><br><span class="line">Additional configs:: </span><br><span class="line">There are currently 0 values in the map:</span><br><span class="line">entry# </span><br><span class="line">New link was successfully created with validation status OK and name hdfs_weibouser_link</span><br></pre></td></tr></table></figure>
<p>04 创建job</p>
<figure class="highlight plain"><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><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br></pre></td><td class="code"><pre><span class="line">sqoop:002> create job -f "mysql_weibouser_link" -t "hdfs_weibouser_link"</span><br><span class="line">Creating job for links with from name mysql_weibouser_link and to name hdfs_weibouser_link</span><br><span class="line">Please fill following values to create new job object</span><br><span class="line">Name: job_weibouser</span><br><span class="line"></span><br><span class="line">Database source</span><br><span class="line"></span><br><span class="line">Schema name: subject</span><br><span class="line">Table name: test</span><br><span class="line">SQL statement: </span><br><span class="line">Column names: </span><br><span class="line">There are currently 0 values in the list:</span><br><span class="line">element# </span><br><span class="line">Partition column: </span><br><span class="line">Partition column nullable: </span><br><span class="line">Boundary query: </span><br><span class="line"></span><br><span class="line">Incremental read</span><br><span class="line"></span><br><span class="line">Check column: </span><br><span class="line">Last value: </span><br><span class="line"></span><br><span class="line">Target configuration</span><br><span class="line"></span><br><span class="line">Override null value: </span><br><span class="line">Null value: </span><br><span class="line">File format: </span><br><span class="line"> 0 : TEXT_FILE</span><br><span class="line"> 1 : SEQUENCE_FILE</span><br><span class="line"> 2 : PARQUET_FILE</span><br><span class="line">Choose: 0</span><br><span class="line">Compression codec: </span><br><span class="line"> 0 : NONE</span><br><span class="line"> 1 : DEFAULT</span><br><span class="line"> 2 : DEFLATE</span><br><span class="line"> 3 : GZIP</span><br><span class="line"> 4 : BZIP2</span><br><span class="line"> 5 : LZO</span><br><span class="line"> 6 : LZ4</span><br><span class="line"> 7 : SNAPPY</span><br><span class="line"> 8 : CUSTOM</span><br><span class="line">Choose: 0</span><br><span class="line">Custom codec: </span><br><span class="line">Output directory: hdfs://localhost:9000/usr/jjzhu/spider/spiders_weibouser</span><br><span class="line">Append mode: </span><br><span class="line"></span><br><span class="line">Throttling resources</span><br><span class="line"></span><br><span class="line">Extractors: 2</span><br><span class="line">Loaders: 2</span><br><span class="line"></span><br><span class="line">Classpath configuration</span><br><span class="line"></span><br><span class="line">Extra mapper jars: </span><br><span class="line">There are currently 0 values in the list:</span><br><span class="line">element# </span><br><span class="line">New job was successfully created with validation status OK and name job_weibouser</span><br></pre></td></tr></table></figure>
<p>05 启动job</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">start job -n job_weibouser</span><br></pre></td></tr></table></figure>
<p>06 查看job状态</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">status job -n job_weibouser</span><br></pre></td></tr></table></figure>
<p>遇到的问题</p>
<p>01 root is not allowed to impersonate root<br>这个问题是用户权限的问题，去core-site.xml 修改为root即可。</p>
<figure class="highlight plain"><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></pre></td><td class="code"><pre><span class="line"><property></span><br><span class="line"> <name>hadoop.proxyuser.root.hosts</name></span><br><span class="line"> <value>*</value></span><br><span class="line"></property></span><br><span class="line"><property></span><br><span class="line"> <name>hadoop.proxyuser.root.groups</name></span><br><span class="line"> <value>*</value></span><br><span class="line"></property></span><br></pre></td></tr></table></figure>
<p>注意，修改过之后发现还是报错，最后重启了一下hadoop集群，错误消失。<br>疑问：为什么要重启hadoop集群？<br>02 数据库拒绝连接<br>这类错误一般都是数据库的账号密码配置有误，重新修改即可。<br>03 查看job历史记录，会卡顿，并报错<br>Exception has occurred during processing command<br>Exception: org.apache.sqoop.common.SqoopException Message: MAPREDUCE_0003:Can’t get RunningJob instance<br>解决办法：</p>
<figure class="highlight plain"><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></pre></td><td class="code"><pre><span class="line">编辑mapred-site.xml</span><br><span class="line"><property></span><br><span class="line"> <name>mapreduce.jobhistory.address</name></span><br><span class="line"> <value>localhost:10020</value></span><br><span class="line"></property></span><br></pre></td></tr></table></figure>
<p>然后进入hadoop目录下面的sbin目录下<br>./mr-jobhistory-daemon.sh start historyserver<br>然后再执行<br>status job -n ***jobName</p>
<h2 id="参考网站："><a href="#参考网站：" class="headerlink" title="参考网站："></a>参考网站：</h2><p>sqoop2 安装使用指南：<a href="https://www.cnblogs.com/zh-yp/p/9109166.html" target="_blank" rel="noopener">https://www.cnblogs.com/zh-yp/p/9109166.html</a><br><a href="https://cloud.tencent.com/developer/article/1015032" target="_blank" rel="noopener">https://cloud.tencent.com/developer/article/1015032</a></p>
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<h1 id="java阻塞队列-BlockingQueue-实现"><a href="#java阻塞队列-BlockingQueue-实现" class="headerlink" title="java阻塞队列 BlockingQueue 实现"></a>java阻塞队列 BlockingQueue 实现</h1><p>#java</p>
<p>java.util.concurrent.BlockingQueue是一个队列实现类。支持：<br>01 当从队列中获取或者移除元素的时候，如果队列为空则需要等待 ，直到队列不为空；同事要向队列添加元素的时候，如果队列无可用的空间，也需要等待。<br>02 BlockingQueue 类不需要接受null值，如果你试图将队列添加null，会报错NullPointerException.<br>03 队列是线程安全的。所有方法本身都是原子操作，使用并发控制内部锁或者其他形式。<br>04 blockingQueue这个接口是java集合架构的一部分，用于解决生产者消费者问题。在blockingQueue中我们不用担心生产者操作是否有可用的空间或者消费者操作是否有可用的对象这些问题，这些都会在它的实现类中进行修改。<br>java 提供了几个BlockingQueue的实现类，如：<br>ArrayBlockingQueue LinkedBlockingQueue PriorityBlockingQueue SynchronousQueue<br>下面代码，举例子生产者和消费者</p>
<p>Message.java </p>
<figure class="highlight plain"><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></pre></td><td class="code"><pre><span class="line">package com.testQueue;</span><br><span class="line"></span><br><span class="line">/**</span><br><span class="line"> * @Author: wang</span><br><span class="line"> * @Date: 2019-07-23 12:35</span><br><span class="line"> * @Version 1.0</span><br><span class="line"> * @Content producer产生的对象，普通的java类。</span><br><span class="line"> */</span><br><span class="line">public class Message {</span><br><span class="line"> private String msg;</span><br><span class="line"></span><br><span class="line"> public Message(String msg) {</span><br><span class="line"> this.msg = msg;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> public String getMsg() {</span><br><span class="line"> return msg;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p> Producer.java 这个类产生消息，并放在队列中</p>
<figure class="highlight plain"><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><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br></pre></td><td class="code"><pre><span class="line">package com.testQueue;</span><br><span class="line"></span><br><span class="line">import java.util.concurrent.BlockingQueue;</span><br><span class="line"></span><br><span class="line">/**</span><br><span class="line"> * @Author: wang</span><br><span class="line"> * @Date: 2019-07-23 12:37</span><br><span class="line"> * @Version 1.0</span><br><span class="line"> */</span><br><span class="line">public class Producer implements Runnable {</span><br><span class="line"> private BlockingQueue<Message> queue;</span><br><span class="line"></span><br><span class="line"> public Producer(BlockingQueue<Message> queue) {</span><br><span class="line"> this.queue = queue;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> @Override</span><br><span class="line"> public void run() {</span><br><span class="line"> //生产消息</span><br><span class="line"> for (int i=0 ;i< 100;i++){</span><br><span class="line"> Message message = new Message("---"+i);</span><br><span class="line"> try {</span><br><span class="line"> Thread.sleep(i);</span><br><span class="line"> queue.put(message);</span><br><span class="line"> System.out.println("produced " +message.getMsg());</span><br><span class="line"> } catch (InterruptedException e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> // 添加消息退出</span><br><span class="line"> Message message = new Message("exit");</span><br><span class="line"> try {</span><br><span class="line"> queue.put(message);</span><br><span class="line"> } catch (InterruptedException e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>Customer.java 这个类消费消息</p>
<figure class="highlight plain"><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><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br></pre></td><td class="code"><pre><span class="line">package com.testQueue;</span><br><span class="line"></span><br><span class="line">import java.util.concurrent.BlockingQueue;</span><br><span class="line"></span><br><span class="line">/**</span><br><span class="line"> * @Author: wang</span><br><span class="line"> * @Date: 2019-07-23 12:41</span><br><span class="line"> * @Version 1.0</span><br><span class="line"> */</span><br><span class="line">public class Customer implements Runnable {</span><br><span class="line"> private BlockingQueue<Message> queue;</span><br><span class="line"></span><br><span class="line"> public Customer(BlockingQueue<Message> queue) {</span><br><span class="line"> this.queue = queue;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> @Override</span><br><span class="line"> public void run() {</span><br><span class="line"> Message message;</span><br><span class="line"> try {</span><br><span class="line"> while ((message = queue.take()).getMsg() != "exit"){</span><br><span class="line"> Thread.sleep(10);</span><br><span class="line"> System.out.println(message.getMsg());</span><br><span class="line"></span><br><span class="line"> }</span><br><span class="line"> }catch (InterruptedException err){</span><br><span class="line"> System.out.println(err);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>ProducerConsumerService 生产者/消费者的服务类产生固定大小的BlockingQueue，生产者和消费者同时共享改BlockingQueue，该服务会启动生产者和消费者线程。<br>ProducerConsumerService.java</p>
<figure class="highlight plain"><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><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><span class="line">package com.testQueue;</span><br><span class="line"></span><br><span class="line">import org.springframework.cglib.core.internal.CustomizerRegistry;</span><br><span class="line"></span><br><span class="line">import java.util.Queue;</span><br><span class="line">import java.util.concurrent.ArrayBlockingQueue;</span><br><span class="line">import java.util.concurrent.BlockingQueue;</span><br><span class="line"></span><br><span class="line">/**</span><br><span class="line"> * @Author: wang</span><br><span class="line"> * @Date: 2019-07-23 12:45</span><br><span class="line"> * @Version 1.0</span><br><span class="line"> */</span><br><span class="line">public class ProduceCustomerService {</span><br><span class="line"> public static void main(String[] args) {</span><br><span class="line"> BlockingQueue<Message> queue = new ArrayBlockingQueue<>(10);</span><br><span class="line"> //开启producer 向线程添加东西</span><br><span class="line"> Producer producer = new Producer(queue);</span><br><span class="line"> // 开启customer 向线程 队列消费东西</span><br><span class="line"> Customer customer = new Customer(queue);</span><br><span class="line"> new Thread(customer).start();</span><br><span class="line"></span><br><span class="line"> new Thread(producer).start();</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<a href="/wang.github.io/2019/07/22/sqoop安装/" class="post-title-link" itemprop="url">sqoop2 安装</a>
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<h1 id="sqoop2-安装"><a href="#sqoop2-安装" class="headerlink" title="sqoop2 安装"></a>sqoop2 安装</h1><p>#大数据</p>
<p>sqoop2<br>1 sqoop2 安装：<br> 01 下载地址，官方网站地址<br> <a href="https://www-eu.apache.org/dist/sqoop/1.99.7/" target="_blank" rel="noopener">https://www-eu.apache.org/dist/sqoop/1.99.7/</a><br>02 解压到指定的目录：<br>tar -xvf sqoop-1.99.4-bin-hadoop200.tar.gz /soft 目录下<br>03 新建文件夹_soft_lib/sqoop2 目录，在里面添加mysql jdbc 驱动和postgresql 驱动<br>04 配置环境变量</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">export SQOOP_HOME=/soft/sqoop-1.99.7-bin-hadoop200</span><br><span class="line">export PATH=$SQOOP_HOME/bin:$PATH</span><br><span class="line">export SQOOP_SERVER_EXTRA_LIB=/soft/lib/sqoop2</span><br></pre></td></tr></table></figure>
<p>05 修改hadoop 配置。<br>进入hadoop 目录下的core-site.xml,添加如下代码</p>
<figure class="highlight plain"><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></pre></td><td class="code"><pre><span class="line"><property></span><br><span class="line"> <name>hadoop.proxyuser.sqoop2.hosts</name></span><br><span class="line"> <value>*</value></span><br><span class="line"></property></span><br><span class="line"><property></span><br><span class="line"> <name>hadoop.proxyuser.sqoop2.groups</name></span><br><span class="line"> <value>*</value></span><br><span class="line"></property></span><br></pre></td></tr></table></figure>
<p>06 进入_soft_sqoop-1.99.7-bin-hadoop200/conf 之下，找到sqoop.properties文件，然后把下面一行改成hadoop的真实环境，</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">org.apache.sqoop.submission.engine.mapreduce.configuration.directory=/soft/hadoop-2.6.0-cdh5.9.3/etc/hadoop/</span><br></pre></td></tr></table></figure>
<p>07 执行sqoop2-tool verify 如果提示success finish 的字段，说明执行成功。<br>08 查看日志的目录</p>
<p> cat <em>soft_sqoop-1.99.7-bin-hadoop200/conf</em>@LOGDIR@_sqoop.log</p>
<hr>
<p>遇到的坑：<br>1,99.4 版本跟1.99.7版本不一致，无论怎么改，都会报错，找不到类。最后换成1.99.7 问题解决。</p>
<p>参考资料：<br><a href="https://blog.csdn.net/u012842205/article/details/52344196" target="_blank" rel="noopener">Sqoop1.99.7安装、配置和使用（一） - ez scope - CSDN博客</a></p>
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<p>#大数据<br>源码位置在flink 项目中，可以单独去git 上下载，git 地址，参考上一篇文章。<br> link-examples_flink-examples-streaming_src_main_java_org_apache_flink_streaming_examples_socket/SocketWindowWordCount.java</p>
<p>1.启动一个socket 服务，命令为</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">nc -lk 9000</span><br></pre></td></tr></table></figure>
<p>2.在linux 界面输入</p>
<figure class="highlight plain"><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></pre></td><td class="code"><pre><span class="line">man nc</span><br><span class="line">--------------------------------------------------------------</span><br><span class="line">DESCRIPTION</span><br><span class="line"> The nc (or netcat) utility(功能) is used for just about anything under the sun involving TCP or UDP. It can</span><br><span class="line"> open TCP connections, send UDP packets, listen on arbitrary（任意的） TCP and UDP ports, do port scanning, and</span><br><span class="line"> deal with both IPv4 and IPv6. Unlike telnet(1), nc scripts nicely, and separates error messages onto</span><br><span class="line"> standard error instead of sending them to standard output, as telnet(1) does with some.</span><br><span class="line">个人理解：nc打开tcp连接。发送udp包，监听任意的tcp和udp端口，扫描端口。</span><br><span class="line">--------------------------------------------------------------</span><br><span class="line"> -k Forces nc to stay listening for another connection after its current connection is completed.</span><br><span class="line"> It is an error to use this option without the -l option.</span><br><span class="line"></span><br><span class="line"> -l Used to specify that nc should listen for an incoming connection rather than initiate a connec-</span><br><span class="line"> tion to a remote host. It is an error to use this option in conjunction with the -p, -s, or -z</span><br><span class="line"> options. Additionally, any timeouts specified with the -w option are ignored.</span><br><span class="line"></span><br><span class="line">-l命令是启动一个监听，</span><br><span class="line">-k命令是强制监听其他连接。</span><br></pre></td></tr></table></figure>
<p>3.java 代码分析</p>
<figure class="highlight plain"><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><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br></pre></td><td class="code"><pre><span class="line">/*</span><br><span class="line"> * Licensed to the Apache Software Foundation (ASF) under one</span><br><span class="line"> * or more contributor license agreements. See the NOTICE file</span><br><span class="line"> * distributed with this work for additional information</span><br><span class="line"> * regarding copyright ownership. The ASF licenses this file</span><br><span class="line"> * to you under the Apache License, Version 2.0 (the</span><br><span class="line"> * "License"); you may not use this file except in compliance</span><br><span class="line"> * with the License. You may obtain a copy of the License at</span><br><span class="line"> *</span><br><span class="line"> * http://www.apache.org/licenses/LICENSE-2.0</span><br><span class="line"> *</span><br><span class="line"> * Unless required by applicable law or agreed to in writing, software</span><br><span class="line"> * distributed under the License is distributed on an "AS IS" BASIS,</span><br><span class="line"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span><br><span class="line"> * See the License for the specific language governing permissions and</span><br><span class="line"> * limitations under the License.</span><br><span class="line"> */</span><br><span class="line"></span><br><span class="line">package org.apache.flink.streaming.examples.socket;</span><br><span class="line"></span><br><span class="line">import org.apache.flink.api.common.functions.FlatMapFunction;</span><br><span class="line">import org.apache.flink.api.common.functions.ReduceFunction;</span><br><span class="line">import org.apache.flink.api.java.utils.ParameterTool;</span><br><span class="line">import org.apache.flink.streaming.api.datastream.DataStream;</span><br><span class="line">import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;</span><br><span class="line">import org.apache.flink.streaming.api.windowing.time.Time;</span><br><span class="line">import org.apache.flink.util.Collector;</span><br><span class="line"></span><br><span class="line">/**</span><br><span class="line"> * Implements a streaming windowed version of the "WordCount" program.</span><br><span class="line"> *</span><br><span class="line"> * <p>This program connects to a server socket and reads strings from the socket.</span><br><span class="line"> * The easiest way to try this out is to open a text server (at port 12345)</span><br><span class="line"> * using the <i>netcat</i> tool via</span><br><span class="line"> * <pre></span><br><span class="line"> * nc -lk 9000</span><br><span class="line"> * </pre></span><br><span class="line"> * and run this example with the hostname and the port as arguments.</span><br><span class="line"> */</span><br><span class="line">@SuppressWarnings("serial")</span><br><span class="line">public class SocketWindowWordCount {</span><br><span class="line"></span><br><span class="line"> public static void main(String[] args) throws Exception {</span><br><span class="line"></span><br><span class="line"> // the host and the port to connect to</span><br><span class="line"> final String hostname;</span><br><span class="line"> final int port;</span><br><span class="line"> try {</span><br><span class="line"> final ParameterTool params = ParameterTool.fromArgs(args);</span><br><span class="line"> hostname = params.has("hostname") ? params.get("hostname") : "localhost";</span><br><span class="line"> port = params.getInt("port");</span><br><span class="line"> } catch (Exception e) {</span><br><span class="line"> System.err.println("No port specified. Please run 'SocketWindowWordCount " +</span><br><span class="line"> "--hostname <hostname> --port <port>', where hostname (localhost by default) " +</span><br><span class="line"> "and port is the address of the text server");</span><br><span class="line"> System.err.println("To start a simple text server, run 'netcat -l <port>' and " +</span><br><span class="line"> "type the input text into the command line");</span><br><span class="line"> return;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> // get the execution environment</span><br><span class="line"> final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();</span><br><span class="line"></span><br><span class="line"> // get input data by connecting to the socket</span><br><span class="line"> DataStream<String> text = env.socketTextStream(hostname, port, "\n");</span><br><span class="line"></span><br><span class="line"> // parse the data, group it, window it, and aggregate the counts</span><br><span class="line"> DataStream<WordWithCount> windowCounts = text</span><br><span class="line"></span><br><span class="line"> .flatMap(new FlatMapFunction<String, WordWithCount>() {</span><br><span class="line"> @Override</span><br><span class="line"> public void flatMap(String value, Collector<WordWithCount> out) {</span><br><span class="line"> for (String word : value.split("\\s")) {</span><br><span class="line"> out.collect(new WordWithCount(word, 1L));</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> })</span><br><span class="line"></span><br><span class="line"> .keyBy("word")</span><br><span class="line"> .timeWindow(Time.seconds(10))</span><br><span class="line"></span><br><span class="line"> .reduce(new ReduceFunction<WordWithCount>() {</span><br><span class="line"> @Override</span><br><span class="line"> public WordWithCount reduce(WordWithCount a, WordWithCount b) {</span><br><span class="line"> return new WordWithCount(a.word, a.count + b.count);</span><br><span class="line"> }</span><br><span class="line"> });</span><br><span class="line"></span><br><span class="line"> // print the results with a single thread, rather than in parallel</span><br><span class="line"> windowCounts.print().setParallelism(1);</span><br><span class="line"></span><br><span class="line"> env.execute("Socket Window WordCount");</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> // ------------------------------------------------------------------------</span><br><span class="line"></span><br><span class="line"> /**</span><br><span class="line"> * Data type for words with count.</span><br><span class="line"> */</span><br><span class="line"> public static class WordWithCount {</span><br><span class="line"></span><br><span class="line"> public String word;</span><br><span class="line"> public long count;</span><br><span class="line"></span><br><span class="line"> public WordWithCount() {}</span><br><span class="line"></span><br><span class="line"> public WordWithCount(String word, long count) {</span><br><span class="line"> this.word = word;</span><br><span class="line"> this.count = count;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> @Override</span><br><span class="line"> public String toString() {</span><br><span class="line"> return word + " : " + count;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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