[PIG-1308] Inifinite loop in JobClient when reading from BinStorage Message: [org.apache.hadoop.mapreduce.lib.input.FileInputFormat - Total input paths to process : 2]

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.7.0
• Hadoop Flags: Reviewed
• Assignee: Pradeep Kamath
• Reporter: Viraj Bhat
• Created: 18/Mar/10 23:50
• Updated: 14/May/10 06:47
• Resolved: 22/Mar/10 18:03

Description

Simple script fails to read files from BinStorage() and fails to submit jobs to JobTracker. This occurs with trunk and not with Pig 0.6 branch.

data = load 'binstoragesample' using BinStorage() as (s, m, l);
A = foreach ULT generate   s#'key'         as value;
X = limit A 20;
dump X;

When this script is submitted to the Jobtracker, we found the following error:
2010-03-18 22:31:22,296 [main] INFO org.apache.hadoop.mapreduce.lib.input.FileInputFormat - Total input paths to process : 2
2010-03-18 22:32:01,574 [main] INFO org.apache.hadoop.mapreduce.lib.input.FileInputFormat - Total input paths to process : 2
2010-03-18 22:32:43,276 [main] INFO org.apache.hadoop.mapreduce.lib.input.FileInputFormat - Total input paths to process : 2
2010-03-18 22:33:21,743 [main] INFO org.apache.hadoop.mapreduce.lib.input.FileInputFormat - Total input paths to process : 2
2010-03-18 22:34:02,004 [main] INFO org.apache.hadoop.mapreduce.lib.input.FileInputFormat - Total input paths to process : 2
2010-03-18 22:34:43,442 [main] INFO org.apache.hadoop.mapreduce.lib.input.FileInputFormat - Total input paths to process : 2
2010-03-18 22:35:25,907 [main] INFO org.apache.hadoop.mapreduce.lib.input.FileInputFormat - Total input paths to process : 2
2010-03-18 22:36:07,402 [main] INFO org.apache.hadoop.mapreduce.lib.input.FileInputFormat - Total input paths to process : 2
2010-03-18 22:36:48,596 [main] INFO org.apache.hadoop.mapreduce.lib.input.FileInputFormat - Total input paths to process : 2
2010-03-18 22:37:28,014 [main] INFO org.apache.hadoop.mapreduce.lib.input.FileInputFormat - Total input paths to process : 2
2010-03-18 22:38:04,823 [main] INFO org.apache.hadoop.mapreduce.lib.input.FileInputFormat - Total input paths to process : 2
2010-03-18 22:38:38,981 [main] INFO org.apache.hadoop.mapreduce.lib.input.FileInputFormat - Total input paths to process : 2
2010-03-18 22:39:12,220 [main] INFO org.apache.hadoop.mapreduce.lib.input.FileInputFormat - Total input paths to process : 2

Stack Trace revelead

at org.apache.pig.impl.io.ReadToEndLoader.init(ReadToEndLoader.java:144)
at org.apache.pig.impl.io.ReadToEndLoader.<init>(ReadToEndLoader.java:115)
at org.apache.pig.builtin.BinStorage.getSchema(BinStorage.java:404)
at org.apache.pig.impl.logicalLayer.LOLoad.determineSchema(LOLoad.java:167)
at org.apache.pig.impl.logicalLayer.LOLoad.getProjectionMap(LOLoad.java:263)
at org.apache.pig.impl.logicalLayer.ProjectionMapCalculator.visit(ProjectionMapCalculator.java:112)
at org.apache.pig.impl.logicalLayer.LOLoad.visit(LOLoad.java:210)
at org.apache.pig.impl.logicalLayer.LOLoad.visit(LOLoad.java:52)
at org.apache.pig.impl.plan.DependencyOrderWalker.walk(DependencyOrderWalker.java:69)
at org.apache.pig.impl.plan.PlanVisitor.visit(PlanVisitor.java:51)
at org.apache.pig.impl.logicalLayer.optimizer.LogicalTransformer.rebuildProjectionMaps(LogicalTransformer.java:76)
at org.apache.pig.impl.logicalLayer.optimizer.LogicalOptimizer.optimize(LogicalOptimizer.java:216)
at org.apache.pig.PigServer.compileLp(PigServer.java:883)
at org.apache.pig.PigServer.store(PigServer.java:564)

The binstorage data was generated from 2 datasets using limit and union:

Large1 = load 'input1'  using PigStorage();
Large2 = load 'input2' using PigStorage();
V = limit Large1 10000;
C = limit Large2 10000;
U = union V, C;
store U into 'binstoragesample' using BinStorage();