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宇智波小高
这个人很懒什么都没有留下
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9个月前
问题描述我有一个数据框,其中为每个 id 记录了 1 个或多个事件.对于每个事件,都会记录 id、度
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10个月前
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class="fen bdsharebuttonbox" data-initialized="true" dataid="221766"> <a class="bds_weixin weixin icon-wechat" data-cmd="weixin"></a> <a class="bds_qzone qq icon-qq" data-cmd="qq" href="#"></a> <a class="bds_qzone qzone icon-qzone" data-cmd="qzone" href="#"></a> <a class="bds_tsina sina icon-weibo" data-cmd="tsina"></a> </div> </li> <li class="range"> </li> </ul> </div> <div class="one-cont"> <div class="one-cont-title clearfix"> <div class="v-shenhe"> </div> <div class="v-pub-time"> 2年前</div> </div> <p class="fonts"> <a href="/b10b215632/"> hadoop面试题及答案 </a> </p> 应该是文件执行权限的问题, 你的hadoop用户没有执行java的权限, 你需要修改一下/usr/local/jdk1.7.0_17/bin/java 的文件权限:<br><br>chmod o x /usr/local/jdk1.7.0_17/bin/java<br><br><hr style="border: none;border-bottom:2px dashed #000"><br> $hadoop=`which hadoop`; <br>#这里加上一句<br>print "$hadoop fs -get .....\n";<br>`$hadoop fs -get ......`;<br>看看打印出来的命令是不是你想要的,如果是你想要的,就手动执行一遍。<br>有问题继续追问。 <ul class="discuss clearfix number" data-disable="0"> <li class="range 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可以,在一个sheet页中你点工具栏数据-编辑关系,可以编辑主数据源和辅数据源的连接关系。<br><br><hr style="border: none;border-bottom:2px dashed #000"><br> <img src="http://www.all.com/files/articles/416/0/92/92001_20200923103544339.jpg" /><br><br>搜一下:麻烦问一下tableau支持多个数据源下的表关联吗 <ul class="discuss clearfix number" data-disable="0"> <li class="range js_support"> <i class="support" type="1" dataid="218458"></i> <span>0</span> </li> <li class="range js_support"> <i class="nosupport" type="0" dataid="218458"></i> <span>0</span> </li> <li class="range js_collect"> <i class="collect" type="1" dataid="218458"></i> <span>0</span> </li> <li class="range js_comment"> <a href="/b140b/218458/"> <i></i><span>0</span> </a> </li> <li class="range shares"> <i></i> <span>0</span> <div class="fen bdsharebuttonbox" data-initialized="true" dataid="218458"> <a class="bds_weixin weixin icon-wechat" data-cmd="weixin"></a> <a class="bds_qzone qq icon-qq" data-cmd="qq" href="#"></a> <a class="bds_qzone qzone icon-qzone" data-cmd="qzone" href="#"></a> <a 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p打开命令行,输入installpackage,回车,然后继续输入converttoutf8,回车。<br/>可是安装后打开本地文件还是错误。<br/>原来是缺少codecs,所以在此打开命令行-->输入installpackage-->codecs,<br/>重启sublimetext3,打开乱码文件按下ctrl shift c<br/>pc端sublimetext3中文乱码解决方法:<br/><br <ul class="discuss clearfix number" data-disable="0"> <li class="range js_support"> <i class="support" type="1" dataid="219620"></i> <span>0</span> </li> <li class="range js_support"> <i class="nosupport" type="0" dataid="219620"></i> <span>0</span> </li> <li class="range js_collect"> <i class="collect" type="1" dataid="219620"></i> <span>0</span> </li> <li class="range js_comment"> <a href="/b135b/219620/"> <i></i><span>0</span> </a> </li> <li class="range shares"> <i></i> <span>0</span> <div class="fen bdsharebuttonbox" data-initialized="true" dataid="219620"> <a class="bds_weixin weixin icon-wechat" data-cmd="weixin"></a> <a class="bds_qzone qq icon-qq" data-cmd="qq" href="#"></a> <a class="bds_qzone qzone icon-qzone" data-cmd="qzone" href="#"></a> <a class="bds_tsina sina icon-weibo" data-cmd="tsina"></a> </div> </li> <li class="range"> </li> </ul> </div> <div class="one-cont"> <div class="one-cont-title clearfix"> <div class="v-shenhe"> </div> <div class="v-pub-time"> 2年前</div> </div> <p class="fonts"> <a href="/b153b216767/"> spark 菜鸟教程 </a> </p> 第一阶段:熟练掌握scala语言<br/>1,spark框架是采用scala语言写的,精致优雅。想要成为spark高手,你就必须阅读spark源码,就必须掌握scala。?<br/>2,虽然现在的spark可以使用多种语言开发,java,python,但是最快速和支持最好的api依然并将永远是scala的api,所以必须掌握scala来编写复杂的和高性能的spark分布式程序。?<br/>3尤其是熟练掌握scala的trait,apply,函数式编程,泛型,逆变,与协变等。<br/>第二阶段:精通spark平台本身提供给开发折的api<br/>1,掌握spark中面向rdd的开发模式,掌握各种transformation和action函数的使用。?<br/>2,掌握spark中的款依赖和窄依赖,lineage机制。?<br/>3,掌握rdd的计算流程,如stage的划分,spark应用程序提交给集群的基础过程和work节点基础的工作原理。<br/>第三阶段:深入spark内核<br/>此阶段主要是通过spark框架的源码研读来深入spark内核部分:?<br/>1,通过源码掌握spark的任务提交 <ul class="discuss clearfix number" data-disable="0"> <li class="range js_support"> <i class="support" type="1" dataid="216767"></i> <span>0</span> </li> <li class="range js_support"> <i class="nosupport" 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