Difference in Semantics between Load statement in Pig and HDFS client on
Command line
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Key: PIG-1576
URL: https://issues.apache.org/jira/browse/PIG-1576
Project: Pig
Issue Type: Bug
Components: impl
Affects Versions: 0.7.0, 0.6.0
Reporter: Viraj Bhat
Here is my directory structure on HDFS which I want to access using Pig.
This is a sample, but in real use case I have more than 100 of these
directories.
{code}
$ hadoop fs -ls /user/viraj/recursive/
Found 3 items
drwxr-xr-x - viraj supergroup 0 2010-08-26 11:25
/user/viraj/recursive/20080615
drwxr-xr-x - viraj supergroup 0 2010-08-26 11:25
/user/viraj/recursive/20080616
drwxr-xr-x - viraj supergroup 0 2010-08-26 11:25
/user/viraj/recursive/20080617
{code}
Using the command line I am access them using variety of options:
{code}
$ hadoop fs -ls /user/viraj/recursive/{200806}{15..17}/
-rw-r--r-- 1 viraj supergroup 5791 2010-08-26 11:25
/user/viraj/recursive/20080615/kv2.txt
-rw-r--r-- 1 viraj supergroup 5791 2010-08-26 11:25
/user/viraj/recursive/20080616/kv2.txt
-rw-r--r-- 1 viraj supergroup 5791 2010-08-26 11:25
/user/viraj/recursive/20080617/kv2.txt
$ hadoop fs -ls /user/viraj/recursive/{20080615..20080617}/
-rw-r--r-- 1 viraj supergroup 5791 2010-08-26 11:25
/user/viraj/recursive/20080615/kv2.txt
-rw-r--r-- 1 viraj supergroup 5791 2010-08-26 11:25
/user/viraj/recursive/20080616/kv2.txt
-rw-r--r-- 1 viraj supergroup 5791 2010-08-26 11:25
/user/viraj/recursive/20080617/kv2.txt
{code}
I have written a Pig script, all the below combination of load statements do
not work?
{code}
--A = load '/user/viraj/recursive/{200806}{15..17}/' using PigStorage('\u0001')
as (k:int, v:chararray);
A = load '/user/viraj/recursive/{20080615..20080617}/' using
PigStorage('\u0001') as (k:int, v:chararray);
AL = limit A 10;
dump AL;
{code}
I get the following error in Pig 0.8
{noformat}
2010-08-27 16:34:27,704 [main] ERROR org.apache.pig.tools.pigstats.PigStatsUtil
- 1 map reduce job(s) failed!
2010-08-27 16:34:27,711 [main] INFO org.apache.pig.tools.pigstats.PigStats -
Script Statistics:
HadoopVersion PigVersion UserId StartedAt FinishedAt Features
0.20.2 0.8.0-SNAPSHOT viraj 2010-08-27 16:34:24 2010-08-27 16:34:27
LIMIT
Failed!
Failed Jobs:
JobId Alias Feature Message Outputs
N/A A,AL Message:
org.apache.pig.backend.executionengine.ExecException: ERROR 2118: Unable to
create input splits for: /user/viraj/recursive/{20080615..20080617}/
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigInputFormat.getSplits(PigInputFormat.java:279)
at org.apache.hadoop.mapred.JobClient.writeNewSplits(JobClient.java:885)
at
org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:779)
at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:730)
at org.apache.hadoop.mapred.jobcontrol.Job.submit(Job.java:378)
at
org.apache.hadoop.mapred.jobcontrol.JobControl.startReadyJobs(JobControl.java:247)
at
org.apache.hadoop.mapred.jobcontrol.JobControl.run(JobControl.java:279)
at java.lang.Thread.run(Thread.java:619)
Caused by: org.apache.hadoop.mapreduce.lib.input.InvalidInputException: Input
Pattern hdfs://localhost:9000/user/viraj/recursive/{20080615..20080617} matches
0 files
at
org.apache.hadoop.mapreduce.lib.input.FileInputFormat.listStatus(FileInputFormat.java:224)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigTextInputFormat.listStatus(PigTextInputFormat.java:36)
at
org.apache.hadoop.mapreduce.lib.input.FileInputFormat.getSplits(FileInputFormat.java:241)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigInputFormat.getSplits(PigInputFormat.java:268)
... 7 more
hdfs://localhost:9000/tmp/temp241388470/tmp987803889,
{noformat}
The following works:
{code}
A = load '/user/viraj/recursive/{200806}{15,16,17}/' using PigStorage('\u0001')
as (k:int, v:chararray);
AL = limit A 10;
dump AL;
{code}
Why is there an inconsistency between HDFS client and Pig?
Viraj
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