set default_parallelism construct does not set the number of reducers correctly
-------------------------------------------------------------------------------
Key: PIG-1144
URL: https://issues.apache.org/jira/browse/PIG-1144
Project: Pig
Issue Type: Bug
Components: impl
Affects Versions: 0.7.0
Environment: Hadoop 20 cluster with multi-node installation
Reporter: Viraj Bhat
Fix For: 0.7.0
Hi all,
I have a Pig script where I set the parallelism using the following set
construct: "set default_parallel 100" . I modified the "MRPrinter.java" to
printout the parallelism
{code}
...
public void visitMROp(MapReduceOper mr)
mStream.println("MapReduce node " + mr.getOperatorKey().toString() + "
Parallelism " + mr.getRequestedParallelism());
...
{code}
When I run an explain on the script, I see that the last job which does the
actual sort, runs as a single reducer job. This can be corrected, by adding the
PARALLEL keyword in front of the ORDER BY.
Attaching the script and the explain output
Viraj
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
