hadoop - pig 用线程运行

Question

我正在尝试使用命令将数据从本地目录加载到Pig

records =将'/ home / hduser / Downloads / 1901'加载为(year:chararray，temperature:int，quality:int);

转储记录；
这很好。

当我尝试下一个命令时

filtered_records =按温度过滤记录!= 9999 AND(质量== 0或质量== 1或质量== 4或质量== 5或质量== 9);

转储filterd_records;

这显示了带有某些线程的以下消息

2015-05-05 19:59:50,998 [main] INFO  org.apache.pig.impl.logicalLayer.optimizer.PruneColumns - No column pruned for records
2015-05-05 19:59:50,999 [main] INFO  org.apache.pig.impl.logicalLayer.optimizer.PruneColumns - No map keys pruned for records
2015-05-05 19:59:51,102 [main] INFO  org.apache.hadoop.metrics.jvm.JvmMetrics - Initializing JVM Metrics with processName=JobTracker, sessionId=
2015-05-05 19:59:51,294 [main] INFO  org.apache.pig.backend.hadoop.executionengine.HExecutionEngine - (Name: Store(file:/tmp/temp138869802/tmp-1519406150:org.apache.pig.builtin.BinStorage) - 1-90 Operator Key: 1-90)
2015-05-05 19:59:51,380 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MultiQueryOptimizer - MR plan size before optimization: 1
2015-05-05 19:59:51,393 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MultiQueryOptimizer - MR plan size after optimization: 1
2015-05-05 19:59:51,457 [main] INFO  org.apache.hadoop.metrics.jvm.JvmMetrics - Cannot initialize JVM Metrics with processName=JobTracker, sessionId= - already initialized
2015-05-05 19:59:51,460 [main] INFO  org.apache.hadoop.metrics.jvm.JvmMetrics - Cannot initialize JVM Metrics with processName=JobTracker, sessionId= - already initialized
2015-05-05 19:59:51,465 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler - mapred.job.reduce.markreset.buffer.percent is not set, set to default 0.3
2015-05-05 19:59:52,893 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler - Setting up single store job
2015-05-05 19:59:53,042 [main] INFO  org.apache.hadoop.metrics.jvm.JvmMetrics - Cannot initialize JVM Metrics with processName=JobTracker, sessionId= - already initialized
2015-05-05 19:59:53,043 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher - 1 map-reduce job(s) waiting for submission.
2015-05-05 19:59:53,047 [Thread-4] WARN  org.apache.hadoop.mapred.JobClient - Use GenericOptionsParser for parsing the arguments. Applications should implement Tool for the same.
2015-05-05 19:59:53,259 [Thread-4] INFO  org.apache.hadoop.metrics.jvm.JvmMetrics - Cannot initialize JVM Metrics with processName=JobTracker, sessionId= - already initialized
2015-05-05 19:59:53,323 [Thread-4] INFO  org.apache.hadoop.metrics.jvm.JvmMetrics - Cannot initialize JVM Metrics with processName=JobTracker, sessionId= - already initialized
2015-05-05 19:59:53,377 [Thread-4] INFO  org.apache.hadoop.mapreduce.lib.input.FileInputFormat - Total input paths to process : 1
2015-05-05 19:59:53,385 [Thread-4] INFO  org.apache.pig.backend.hadoop.executionengine.util.MapRedUtil - Total input paths to process : 1
2015-05-05 19:59:53,549 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher - 0% complete
2015-05-05 19:59:53,860 [Thread-13] INFO  org.apache.hadoop.metrics.jvm.JvmMetrics - Cannot initialize JVM Metrics with processName=JobTracker, sessionId= - already initialized
2015-05-05 19:59:53,869 [Thread-13] INFO  org.apache.hadoop.mapreduce.lib.input.FileInputFormat - Total input paths to process : 1
2015-05-05 19:59:53,870 [Thread-13] INFO  org.apache.pig.backend.hadoop.executionengine.util.MapRedUtil - Total input paths to process : 1
2015-05-05 19:59:53,953 [Thread-13] INFO  org.apache.hadoop.metrics.jvm.JvmMetrics - Cannot initialize JVM Metrics with processName=JobTracker, sessionId= - already initialized
2015-05-05 19:59:53,957 [Thread-13] INFO  org.apache.hadoop.metrics.jvm.JvmMetrics - Cannot initialize JVM Metrics with processName=JobTracker, sessionId= - already initialized
2015-05-05 19:59:53,996 [Thread-13] INFO  org.apache.hadoop.metrics.jvm.JvmMetrics - Cannot initialize JVM Metrics with processName=JobTracker, sessionId= - already initialized
2015-05-05 19:59:54,024 [Thread-13] INFO  org.apache.hadoop.metrics.jvm.JvmMetrics - Cannot initialize JVM Metrics with processName=JobTracker, sessionId= - already initialized
2015-05-05 19:59:54,323 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher - HadoopJobId: job_local_0001
2015-05-05 19:59:54,893 [Thread-13] INFO  org.apache.hadoop.mapred.TaskRunner - Task:attempt_local_0001_m_000000_0 is done. And is in the process of commiting
2015-05-05 19:59:54,901 [Thread-13] INFO  org.apache.hadoop.metrics.jvm.JvmMetrics - Cannot initialize JVM Metrics with processName=JobTracker, sessionId= - already initialized
2015-05-05 19:59:54,901 [Thread-13] INFO  org.apache.hadoop.mapred.LocalJobRunner - 
2015-05-05 19:59:54,902 [Thread-13] INFO  org.apache.hadoop.mapred.TaskRunner - Task attempt_local_0001_m_000000_0 is allowed to commit now
2015-05-05 19:59:54,907 [Thread-13] INFO  org.apache.hadoop.metrics.jvm.JvmMetrics - Cannot initialize JVM Metrics with processName=JobTracker, sessionId= - already initialized
2015-05-05 19:59:54,957 [Thread-13] INFO  org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter - Saved output of task 'attempt_local_0001_m_000000_0' to file:/tmp/temp138869802/tmp-1519406150
2015-05-05 19:59:54,958 [Thread-13] INFO  org.apache.hadoop.mapred.LocalJobRunner - 
2015-05-05 19:59:54,958 [Thread-13] INFO  org.apache.hadoop.mapred.TaskRunner - Task 'attempt_local_0001_m_000000_0' done.
2015-05-05 19:59:58,829 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher - 100% complete
2015-05-05 19:59:58,830 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher - Successfully stored result in: "file:/tmp/temp138869802/tmp-1519406150"
2015-05-05 19:59:58,833 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher - Records written : 0
2015-05-05 19:59:58,837 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher - Bytes written : 0
2015-05-05 19:59:58,837 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher - Spillable Memory Manager spill count : 0
2015-05-05 19:59:58,837 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher - Proactive spill count : 0
2015-05-05 19:59:58,837 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher - Success!
2015-05-05 19:59:58,920 [main] INFO  org.apache.hadoop.metrics.jvm.JvmMetrics - Cannot initialize JVM Metrics with processName=JobTracker, sessionId= - already initialized
2015-05-05 19:59:58,930 [main] INFO  org.apache.hadoop.mapreduce.lib.input.FileInputFormat - Total input paths to process : 1
2015-05-05 19:59:58,933 [main] INFO  org.apache.pig.backend.hadoop.executionengine.util.MapRedUtil - Total input paths to process : 1

我看不到任何输出。帮助我解决问题。

Answer 1

我认为您应该定义您的加载程序，例如:

records = load '/home/hduser/Downloads/1901'  Using PigStorage(',') as (year:chararray,temperature:int, quality:int);

根据定义的方案将数据正确地保存在记录表中。
(如果您使用的是csv或tsv，请使用正确的加载器功能，而不是将PigStorage的分隔符更新为数据文件中使用的分隔符)