使用来自大象-鸟类-猪的JsonLoader时出错

Question

我正在尝试使用JSonLoader形式的象-鸟-猪软件包。

我的脚本很简单：

register elephant-bird-pig-4.5.jar
register elephant-bird-hadoop-compat-4.5.jar

A = load '1_record_2.json' USING com.twitter.elephantbird.pig.load.JsonLoader('-nestedLoad');

DUMP A

我得到了一个错误：

2014-09-30 16:15:32,439 [main] INFO  org.apache.hadoop.conf.Configuration.deprecation - fs.default.name is deprecated. Instead, use fs.defaultFS
2014-09-30 16:15:32,447 [main] INFO  org.apache.pig.tools.pigstats.ScriptState - Pig features used in the script: UNKNOWN
2014-09-30 16:15:32,448 [main] INFO  org.apache.pig.newplan.logical.optimizer.LogicalPlanOptimizer - {RULES_ENABLED=[AddForEach, ColumnMapKeyPrune, GroupByConstParallelSetter, LimitOptimizer, LoadTypeCastInserter, MergeFilter, MergeForEach, NewPartitionFilterOptimizer, PartitionFilterOptimizer, PushDownForEachFlatten, PushUpFilter, SplitFilter, StreamTypeCastInserter], RULES_DISABLED=[FilterLogicExpressionSimplifier]}
2014-09-30 16:15:32,449 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MRCompiler - File concatenation threshold: 100 optimistic? false
2014-09-30 16:15:32,450 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MultiQueryOptimizer - MR plan size before optimization: 1
2014-09-30 16:15:32,450 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MultiQueryOptimizer - MR plan size after optimization: 1
2014-09-30 16:15:32,464 [main] INFO  org.apache.hadoop.yarn.client.RMProxy - Connecting to ResourceManager at hadoop1/10.242.8.131:8050
2014-09-30 16:15:32,466 [main] INFO  org.apache.pig.tools.pigstats.ScriptState - Pig script settings are added to the job
2014-09-30 16:15:32,466 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler - mapred.job.reduce.markreset.buffer.percent is not set, set to default 0.3
2014-09-30 16:15:32,467 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 2998: Unhandled internal error. com/twitter/elephantbird/util/HadoopCompat
Details at logfile: pig_1412081068149.log

我不知道遗漏了什么。你能给我提个建议吗？

文件pig_1412081068149.log包含：

Pig Stack Trace
---------------
ERROR 2998: Unhandled internal error. com/twitter/elephantbird/util/HadoopCompat

java.lang.NoClassDefFoundError: com/twitter/elephantbird/util/HadoopCompat
    at com.twitter.elephantbird.pig.load.LzoBaseLoadFunc.setLocation(LzoBaseLoadFunc.java:93)
    at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler.getJob(JobControlCompiler.java:477)
    at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler.compile(JobControlCompiler.java:298)
    at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher.launchPig(MapReduceLauncher.java:191)
    at org.apache.pig.PigServer.launchPlan(PigServer.java:1324)
    at org.apache.pig.PigServer.executeCompiledLogicalPlan(PigServer.java:1309)
    at org.apache.pig.PigServer.storeEx(PigServer.java:980)
    at org.apache.pig.PigServer.store(PigServer.java:944)
    at org.apache.pig.PigServer.openIterator(PigServer.java:857)
    at org.apache.pig.tools.grunt.GruntParser.processDump(GruntParser.java:774) etc...

缺少什么类(java.lang.NoClassDefFoundError)？我应该添加更多哪些库？

谢谢

帕韦尔

Answer 1

我已经检查了注册的库是否存在，类是否在库中。

一切看起来都很好，但我还是得到了这个错误。

因此，我离开了猪外壳，并再次打开它-相同的脚本运行良好。

Answer 2

您错过了两个重要的jars进行注册。注册elephant bird-core-4.5.jar注册json-simple-1.1.1.jar

将这两个添加到您的pig脚本中，一切都应该正常工作。