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From "Amir Youssefi (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-153) Incorrect results when there is a dump in between statements.
Date Tue, 18 Mar 2008 07:05:24 GMT
Incorrect results when there is a dump in between statements. 
--------------------------------------------------------------

                 Key: PIG-153
                 URL: https://issues.apache.org/jira/browse/PIG-153
             Project: Pig
          Issue Type: Bug
         Environment: Pig + Hadoop
            Reporter: Amir Youssefi


Following scenario is with Pig + Hadoop. 

A similar run with Local Pig showed correct results.


Here is test file data/test/test2.txt: 

a1	1	5700
b1	2	2001
c2	2	

I run the following script step by step:

grunt> a = load 'data/test/test2.txt';
grunt> dump a;
2008-03-18 06:41:55,163 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- ----- MapReduce Job ---     --
2008-03-18 06:41:55,163 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Input: [/user/amiry/dat     a/test/test2.txt:org.apache.pig.builtin.PigStorage()]
2008-03-18 06:41:55,163 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Map: [[*]]
2008-03-18 06:41:55,163 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Group: null
2008-03-18 06:41:55,163 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Combine: null
2008-03-18 06:41:55,163 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Reduce: null
2008-03-18 06:41:55,163 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Output: /tmp/temp135967     7959/tmp-246846292:org.apache.pig.builtin.BinStorage
2008-03-18 06:41:55,163 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Split: null
2008-03-18 06:41:55,163 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Map parallelism: -1
2008-03-18 06:41:55,163 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Reduce parallelism: -1
2008-03-18 06:41:57,472 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapreduceExec.MapReduceLauncher
- Pig      progress = 0%
2008-03-18 06:41:58,477 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapreduceExec.MapReduceLauncher
- Pig      progress = 50%
2008-03-18 06:42:04,495 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapreduceExec.MapReduceLauncher
- Pig      progress = 100%
(a1, 1, 5700)
(b1, 2, 2001)
(c2, 2, )
grunt> b = filter a by $0 eq 'a1';
grunt> dump b;
2008-03-18 06:42:23,881 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- ----- MapReduce Job ---     --
2008-03-18 06:42:23,881 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Input: [/tmp/temp135967     7959/tmp-246846292:org.apache.pig.builtin.BinStorage]
2008-03-18 06:42:23,881 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Map: [[*]->[FILTER BY (     [PROJECT $0] eq ['a1'])]]
2008-03-18 06:42:23,882 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Group: null
2008-03-18 06:42:23,882 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Combine: null
2008-03-18 06:42:23,882 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Reduce: null
2008-03-18 06:42:23,882 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Output: /tmp/temp135967     7959/tmp1851797397:org.apache.pig.builtin.BinStorage
2008-03-18 06:42:23,882 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Split: null
2008-03-18 06:42:23,882 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Map parallelism: -1
2008-03-18 06:42:23,882 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Reduce parallelism: -1
2008-03-18 06:42:25,938 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapreduceExec.MapReduceLauncher
- Pig      progress = 0%
2008-03-18 06:42:28,946 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapreduceExec.MapReduceLauncher
- Pig      progress = 50%
2008-03-18 06:42:34,963 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapreduceExec.MapReduceLauncher
- Pig      progress = 100%
(a1, 1, 5700)
grunt> c = filter a by $0 eq 'b1';
grunt> dump c;
2008-03-18 06:42:59,884 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- ----- MapReduce Job ---     --
2008-03-18 06:42:59,884 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Input: [/tmp/temp135967     7959/tmp1851797397:org.apache.pig.builtin.BinStorage]
2008-03-18 06:42:59,885 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Map: [[*]->[FILTER BY (     [PROJECT $0] eq ['b1'])]]
2008-03-18 06:42:59,885 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Group: null
2008-03-18 06:42:59,885 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Combine: null
2008-03-18 06:42:59,885 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Reduce: null
2008-03-18 06:42:59,885 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Output: /tmp/temp135967     7959/tmp-1157182212:org.apache.pig.builtin.BinStorage
2008-03-18 06:42:59,885 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Split: null
2008-03-18 06:42:59,885 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Map parallelism: -1
2008-03-18 06:42:59,885 [main] INFO  org.apache.pig.backend.hadoop.executionengine.POMapreduce
- Reduce parallelism: -1
2008-03-18 06:43:01,964 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapreduceExec.MapReduceLauncher
- Pig      progress = 0%
2008-03-18 06:43:04,974 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapreduceExec.MapReduceLauncher
- Pig      progress = 50%
2008-03-18 06:43:06,980 [main] INFO  org.apache.pig.backend.hadoop.executionengine.mapreduceExec.MapReduceLauncher
- Pig      progress = 100%
grunt>


Meaning c is empty.




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