Question

下面是我的猪脚本。它非常直截了当。加载一些数据。按列过滤数据。使用数据类型生成模式。将数据存储在配置单元表中。当我执行数据时，抛出

emp = load '/root/emp.nulls' using PigStorage(',');
filt = filter emp by $2 is not null;
f = foreach filt generate $0 as id:int, $1 as bdate:chararray, $2 as fname:chararray, $3 as lname:chararray, $4 as gender:chararray, $5 as hdate:chararray;
store f into 'emp_null' using org.apache.hive.hcatalog.pig.HCatStorer();

当我执行数据时，它抛出以下错误

2017-09-15 11:21:04,523 [Thread-12] WARN  org.apache.hadoop.mapred.LocalJobRunner - job_local1554819907_0001
java.lang.Exception: java.io.IOException: java.lang.ClassCastException: org.apache.pig.data.DataByteArray cannot be cast to java.lang.Integer
    at org.apache.hadoop.mapred.LocalJobRunner$Job.runTasks(LocalJobRunner.java:462)
    at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:522)
Caused by: java.io.IOException: java.lang.ClassCastException: org.apache.pig.data.DataByteArray cannot be cast to java.lang.Integer
    at org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.StoreFuncDecorator.putNext(StoreFuncDecorator.java:83)
    at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputFormat$PigRecordWriter.write(PigOutputFormat.java:144)
    at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputFormat$PigRecordWriter.write(PigOutputFormat.java:97)
    at org.apache.hadoop.mapred.MapTask$NewDirectOutputCollector.write(MapTask.java:658)
    at org.apache.hadoop.mapreduce.task.TaskInputOutputContextImpl.write(TaskInputOutputContextImpl.java:89)
    at org.apache.hadoop.mapreduce.lib.map.WrappedMapper$Context.write(WrappedMapper.java:112)
    at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapOnly$Map.collect(PigMapOnly.java:48)
    at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.runPipeline(PigGenericMapBase.java:282)
    at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.map(PigGenericMapBase.java:275)
    at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.map(PigGenericMapBase.java:65)
    at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:146)
    at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:787)
    at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
    at org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:243)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

有人可以帮助我吗？

编辑：如果我在加载过程中生成模式，它可以正常工作。

Answer 1

当您使用以下语法$0 as id:int时，您不是在使用字段，而是使用新字段将值存储在$ 0中。正确的方法是在字段前面加上数据类型的前缀。可能已经修复了较新版本的Pig.Here是正在讨论的issue来修复它。

f = foreach filt generate (int)$0 as id, 
                          (chararray)$1 as bdate,
                          (chararray)$2 as fname, 
                          (chararray)$3 as lname, 
                          (chararray)$4 as gender, 
                          (chararray)$5 as hdate;

运行Pig Script时TypeCast异常

1 个答案: