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Impala获取hive的metadata<br/>Impala通常和Hive共用同一个metadata数据库(通常是MySQL/PostgreSQL),所以Impala能够读取到Hive的元数据信息.如果Impala需要访问Hive表,需要将Hivemetadata刷新到impala中.<br/>在Hive中Create/Drop表后,或者HDFSrebalance,或者手工删除HDFS的文件后,则需要在impala中执行下面两行命令:<br/>INVALIDATEMETADATAtable_name;<br/>describetable_name;<br/>第一行命令INVALIDATEMETADATA告诉impala指定的table元数据已经过期,impala将在下一次使用到该表时自动刷新元数据,第二行命令即触发impala去更新元数据,以免将来真正使用该表耗时太久.<br/>如果Impala已经知道了Hive表的存在后,又通过Hive增加或删除分区或altertable,使用refresh
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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>`$hadoop fs -get ......`;<br>看看打印出来的命令是不是你想要的，如果是你想要的，就手动执行一遍。<br>有问题继续追问。
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可以，在一个sheet页中你点工具栏数据-编辑关系，可以编辑主数据源和辅数据源的连接关系。<br><br><hr style="border: none;border-bottom:2px dashed #000"><br> <img src="http://www.all.com/files/Articles/416/0/92/92001_20200923103544339.jpg" /><br><br>搜一下：麻烦问一下tableau支持多个数据源下的表关联吗
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sublimetext3bulidmac版是macos平台上的一款非常不错的代码编辑器，同时sublimetext也是跨平台的，界面和功能感觉和TextMate比较相似。<br/>sublimetext3中文乱码解决方法介绍：<br/>1、打开sublimetext3，按windows：Ctrl+～;mac：control+~打开控制行，复制粘贴以下python代码，然后回车运行。<br/>2、重启sublimetext3。<br/>3、按windows：Ctrl+Shift+P;mac：command+shift+P打开命令行，输入InstallPackage，回车，然后继续输入ConvertToUTF8，回车。<br/>可是安装后打开本地文件还是错误。<br/>原来是缺少Codecs，所以在此打开命令行-->输入InstallPackage-->Codecs，<br/>重启sublimetext3，打开乱码文件按下ctrl+shift+c<br/>pc端sublimetext3中文乱码解决方法：<br/><br
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Ubuntu安装tensorflow<br>先安装python-dev，再安装tensorflow就好了<br>$ sudo apt-get install python-dev<br><br><hr style="border: none;border-bottom:2px dashed #000"><br> ubuntu安装tensorflow<br>先安装python-dev，再安装tensorflow就好了
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