Veena Basavaraj created SQOOP-1938:
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Summary: DOC:update the sqoop MR engine implementation details
Key: SQOOP-1938
URL: https://issues.apache.org/jira/browse/SQOOP-1938
Project: Sqoop
Issue Type: Sub-task
Reporter: Veena Basavaraj
1. Why we need SqoopWritable, what can be done in future?
2. Even though we call sqoop as a map only, is that how it always works? what
happend when numLoaders is non zero
{code}
// Set number of reducers as number of configured loaders or suppress
// reduce phase entirely if loaders are not set at all.
if(request.getLoaders() != null) {
job.setNumReduceTasks(request.getLoaders());
} else {
job.setNumReduceTasks(0);
}
{code}
3. Internals of SqoopNullOutputFormat and how SqoopWritable is used in it
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