我正在运行Pig 0.13.0和Hadoop 2.5.1，两者都是从Apache发行版安装的，它们不是来自Horton或Cloudera的软件包或其他任何东西。
我正在使用一个教程，可以在本地运行Pig（$> ./pig -x local）时使其工作正常，但是当尝试在Hadoop实例上运行它时，我得到一个错误，我很难时间研究互联网。
此命令：
movies = LOAD '/home/hduser/pig-tutorial-master/movies_data.csv' USING PigStorage(',') as (id,name,year,rating,duration);
DUMP movies;
在本地运行良好。当我在Hadoop / MR模式下运行它时，当我运行第一行代码时似乎工作正常：
grunt> movies = LOAD '/home/hduser/pig-tutorial-master/movies_data.csv' USING PigStorage(',') as (id,name,year,rating,duration);
2014-10-29 18:16:26,281 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
2014-10-29 18:16:26,281 [main] INFO org.apache.hadoop.conf.Configuration.deprecation - mapred.job.tracker is deprecated. Instead, use mapreduce.jobtracker.address
但是当我尝试$> DUMP movies时，它给了我这样的痕迹：
grunt> dump movies
2014-10-29 18:17:15,419 [main] INFO org.apache.pig.tools.pigstats.ScriptState - Pig features used in the script: UNKNOWN
2014-10-29 18:17:15,420 [main] INFO org.apache.pig.newplan.logical.optimizer.LogicalPlanOptimizer - {RULES_ENABLED=[AddForEach, ColumnMapKeyPrune, GroupByConstParallelSetter, LimitOptimizer, LoadTypeCastInserter, MergeFilter, MergeForEach, PartitionFilterOptimizer, PushDownForEachFlatten, PushUpFilter, SplitFilter, StreamTypeCastInserter], RULES_DISABLED=[FilterLogicExpressionSimplifier]}
2014-10-29 18:17:15,445 [main] WARN org.apache.pig.data.SchemaTupleBackend - SchemaTupleBackend has already been initialized
2014-10-29 18:17:15,469 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 2081: Unable to setup the load function.
Details at logfile: /usr/local/pig/pig_1414606194436.log
ERROR 2081是我正在尝试诊断的，但找不到任何有助于我指向正确方向的东西。任何从哪里开始的想法？我认为这与我的Hadoop安装有关，而不是Pig，但我不知道。任何建议都会有所帮助。
谢谢，
标记
编辑：这是完整的日志输出：
ERROR 2081: Unable to setup the load function.
org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1066: Unable to open iterator for alias movies
at org.apache.pig.PigServer.openIterator(PigServer.java:912)
at org.apache.pig.tools.grunt.GruntParser.processDump(GruntParser.java:752)
at org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:372)
at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:228)
at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:203)
at org.apache.pig.tools.grunt.Grunt.run(Grunt.java:66)
at org.apache.pig.Main.run(Main.java:542)
at org.apache.pig.Main.main(Main.java:156)
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:606)
at org.apache.hadoop.util.RunJar.main(RunJar.java:212)
Caused by: org.apache.pig.PigException: ERROR 1002: Unable to store alias movies
at org.apache.pig.PigServer.storeEx(PigServer.java:1015)
at org.apache.pig.PigServer.store(PigServer.java:974)
at org.apache.pig.PigServer.openIterator(PigServer.java:887)
... 12 more
Caused by: org.apache.pig.backend.executionengine.ExecException: ERROR 0: Exception while executing (Name: movies: Store(hdfs://localhost:54310/tmp/temp-1276361014/tmp-2000190966:org.apache.pig.impl.io.InterStorage) - scope-1 Operator Key: scope-1): org.apache.pig.backend.executionengine.ExecException: ERROR 2081: Unable to setup the load function.
at org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:289)
at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POStore.getNextTuple(POStore.java:143)
at org.apache.pig.backend.hadoop.executionengine.fetch.FetchLauncher.runPipeline(FetchLauncher.java:160)
at org.apache.pig.backend.hadoop.executionengine.fetch.FetchLauncher.launchPig(FetchLauncher.java:81)
at org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.launchPig(HExecutionEngine.java:275)
at org.apache.pig.PigServer.launchPlan(PigServer.java:1367)
at org.apache.pig.PigServer.executeCompiledLogicalPlan(PigServer.java:1352)
at org.apache.pig.PigServer.storeEx(PigServer.java:1011)
... 14 more
Caused by: org.apache.pig.backend.executionengine.ExecException: ERROR 2081: Unable to setup the load function.
at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POLoad.getNextTuple(POLoad.java:127)
at org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:281)
... 21 more
Caused by: org.apache.hadoop.mapreduce.lib.input.InvalidInputException: Input path does not exist: hdfs://localhost:54310/home/hduser/pig-tutorial-master/movies_data.csv
at org.apache.hadoop.mapreduce.lib.input.FileInputFormat.singleThreadedListStatus(FileInputFormat.java:321)
at org.apache.hadoop.mapreduce.lib.input.FileInputFormat.listStatus(FileInputFormat.java:264)
at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigTextInputFormat.listStatus(PigTextInputFormat.java:36)
at org.apache.hadoop.mapreduce.lib.input.FileInputFormat.getSplits(FileInputFormat.java:385)
at org.apache.pig.impl.io.ReadToEndLoader.init(ReadToEndLoader.java:190)
at org.apache.pig.impl.io.ReadToEndLoader.<init>(ReadToEndLoader.java:146)
at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POLoad.setUp(POLoad.java:95)
at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POLoad.getNextTuple(POLoad.java:123)
... 22 more
================================================================================
答案 0 :(得分：2)
如果您在hadoop群集上运行来自grunt shell的pig命令，请设置属性： 设置opt.fetch false;
通过设置上述属性转储将在mapreduce模式下运行，默认情况下，上述属性设置为 true 。
答案 1 :(得分：1)
在搜索ERROR 2081的解决方案后，我开始更仔细地查看日志文件中的错误。这是尝试从MR模式访问本地文件的问题。我没有在文档中发现有关如何访问MR与本地数据的任何内容，但这就是问题所在。
如果在MR中运行，则必须通过hdfs：// hostname：54310访问这些文件。在本地，您可以使用路径访问它们。
这个S.O.问题是我的解决方案：how to load files on hadoop cluster using apache pig?。
答案 2 :(得分：0)
如果你正在使用hadoop 2.6.0和猪0.14 将猪降级到0.13可能会有所帮助。这对我有用。