pig ERROR 2997: Encountered IOException. File or directory null does not exist.

grunt> ls
2014-03-30 19:58:31,344 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 2997: Encountered IOException. File or directory null does not exist.

Details at logfile: /usr/local/hadoop/pig_1396180251009.log

解决：

运行grunt>ls /
要加根目录

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