Hadoop QA commented on PIG-895:
+1 overall. Here are the results of testing the latest attachment
against trunk revision 797290.
+1 @author. The patch does not contain any @author tags.
+1 tests included. The patch appears to include 3 new or modified tests.
+1 javadoc. The javadoc tool did not generate any warning messages.
+1 javac. The applied patch does not increase the total number of javac
+1 findbugs. The patch does not introduce any new Findbugs warnings.
+1 release audit. The applied patch does not increase the total number of
release audit warnings.
+1 core tests. The patch passed core unit tests.
+1 contrib tests. The patch passed contrib unit tests.
This message is automatically generated.
> Default parallel for Pig
> Key: PIG-895
> URL: https://issues.apache.org/jira/browse/PIG-895
> Project: Pig
> Issue Type: New Feature
> Components: impl
> Affects Versions: 0.3.0
> Reporter: Daniel Dai
> Fix For: 0.4.0
> Attachments: PIG-895-1.patch, PIG-895-2.patch, PIG-895-3.patch
> For hadoop 20, if user don't specify the number of reducers, hadoop will use
> 1 reducer as the default value. It is different from previous of hadoop, in
> which default reducer number is usually good. 1 reducer is not what user want
> for sure. Although user can use "parallel" keyword to specify number of
> reducers for each statement, it is wordy. We need a convenient way for users
> to express a desired number of reducers. Here is my propose:
> 1. Add one property "default_parallel" to Pig. User can set default_parallel
> in script. Eg:
> set default_parallel '10';
> 2. default_parallel is a hint to Pig. Pig is free to optimize the number of
> reducers (unlike parallel keyword). Currently, since we do not have a
> mechanism to determine the optimal number of reducers, default_parallel will
> be always granted, unless it is override by "parallel" keyword.
> 3. If user put multiple default_parallel inside script, the last entry will
> be taken.
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