pig Error 1066：unable to open iterator for alias A
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在学习pig 的时候
做以下操作 ： dump A;
出现错误：Error 1066：unable to open iterator for alias A
解决方法：
发现虽然启动了hadoop
但是jobtracker的进程没有开启
重新启动一次hadoop ： start-all.sh
再次尝试 成功！
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