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Posted to dev@pig.apache.org by "Richard Ding (JIRA)" <ji...@apache.org> on 2010/07/23 00:10:50 UTC
[jira] Updated: (PIG-1513) Pig doesn't handle empty input directory
[ https://issues.apache.org/jira/browse/PIG-1513?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Richard Ding updated PIG-1513:
------------------------------
Summary: Pig doesn't handle empty input directory (was: Skewed join doesn't handle empty input directory)
Description:
The following script
{code}
A = load 'input';
B = load 'emptydir';
C = join B by $0, A by $0 using 'skewed';
store C into 'output';
{code}
fails with "ERROR: java.lang.RuntimeException: Empty samples file';
In this case, the sample job has 0 maps. Pig doesn't expect this and fails .
For merge join the script
The merge join script
{code}
A = load 'input';
B = load 'emptydir';
C = join A by $0, B by $0 using 'merge';
store C into 'output';
{code}
the sample job again has 0 maps and the script fails with " ERROR 2176: Error processing right input during merge join".
But if we change the join order:
{code}
A = load 'input';
B = load 'emptydir';
C = join B by $0, A by $0 using 'merge';
store C into 'output';
{code}
The second job (merge) now has 0 maps and 0 reduces. And it generates an empty 'output' directory.
Order by on empty directory works fine and generates empty part files.
was:
The following script
{code}
A = load 'input';
B = load 'emptydir';
C = join B by $0, A by $0 using 'skewed';
dump C
{code}
fails with "ERROR: java.lang.RuntimeException: Empty samples file';
In this case, the sample job has 0 maps. Pig doesn't expect this and fails .
> Pig doesn't handle empty input directory
> ----------------------------------------
>
> Key: PIG-1513
> URL: https://issues.apache.org/jira/browse/PIG-1513
> Project: Pig
> Issue Type: Bug
> Reporter: Richard Ding
> Assignee: Richard Ding
> Fix For: 0.8.0
>
>
> The following script
> {code}
> A = load 'input';
> B = load 'emptydir';
> C = join B by $0, A by $0 using 'skewed';
> store C into 'output';
> {code}
> fails with "ERROR: java.lang.RuntimeException: Empty samples file';
> In this case, the sample job has 0 maps. Pig doesn't expect this and fails .
> For merge join the script
> The merge join script
> {code}
> A = load 'input';
> B = load 'emptydir';
> C = join A by $0, B by $0 using 'merge';
> store C into 'output';
> {code}
> the sample job again has 0 maps and the script fails with " ERROR 2176: Error processing right input during merge join".
> But if we change the join order:
> {code}
> A = load 'input';
> B = load 'emptydir';
> C = join B by $0, A by $0 using 'merge';
> store C into 'output';
> {code}
> The second job (merge) now has 0 maps and 0 reduces. And it generates an empty 'output' directory.
> Order by on empty directory works fine and generates empty part files.
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