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我似乎无法弄清楚我要去哪里错了。该脚本非常适用于 PigStorage，但为我提供了 CSVLoader 的 ClassCastException。

我检查了文档，但没有帮助。

这是堆栈跟踪：

Pig Stack Trace
---------------
ERROR 1200: Pig script failed to parse: 
<file pig_script.pig, line 15, column 0> pig script failed to validate: java.lang.ClassCastException: org.apache.pig.piggybank.storage.CSVLoader cannot be cast to org.apache.pig.StoreFuncInterface
org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1000: Error during parsing. Pig script failed to parse: 
<file pig_script.pig, line 15, column 0> pig script failed to validate: java.lang.ClassCastException: org.apache.pig.piggybank.storage.CSVLoader cannot be cast to org.apache.pig.StoreFuncInterface
at org.apache.pig.PigServer$Graph.parseQuery(PigServer.java:1597)
at org.apache.pig.PigServer$Graph.registerQuery(PigServer.java:1540)
at org.apache.pig.PigServer.registerQuery(PigServer.java:540)
at org.apache.pig.tools.grunt.GruntParser.processPig(GruntParser.java:970)
at org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:386)
at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:189)
at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:165)
at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:84)
at org.apache.pig.Main.run(Main.java:555)
at org.apache.pig.Main.main(Main.java:111)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.apache.hadoop.util.RunJar.main(RunJar.java:156)
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1 回答 1

2

如果没有您的 pig 脚本，这是一个猜测，但是您是否尝试在 STORE 语句中使用 CSVLoader？

CSVLoader没有实现StoreFuncInterface，这是您想要用来存储结果的任何东西所必需的。CSVLoader 用于 LOAD 语句。

您可能需要CSVExcelStorage，因为它确实实现了接口。上一个链接也详细说明了用法：

STORE x INTO '<destFileName>'
USING CSVExcelStorage(['<delimiter>' [,{'YES_MULTILINE' | 'NO_MULTILINE'} [,{'UNIX' | 'WINDOWS' | 'UNCHANGED'}]]]);
于 2013-02-28T11:59:21.947 回答