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https://issues.apache.org/jira/browse/HIVE-204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12660288#action_12660288
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Raghotham Murthy commented on HIVE-204:
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Ashish mentioned to me that MapRedTask(local mode, different vm) and
ExecDriver(non-local mode, same vm) existed. This jira is to be able to run
local mode, same vm for junit tests only for stepping through map and reduce
tasks.
This jira is asking for the ability to submit jobs using the MiniMRCluster
class. According to javadocs - "This class creates a single-process Map-Reduce
cluster for junit testing. One thread is created for each server."
> Provide option to run hadoop via TestMiniMR
> -------------------------------------------
>
> Key: HIVE-204
> URL: https://issues.apache.org/jira/browse/HIVE-204
> Project: Hadoop Hive
> Issue Type: Improvement
> Components: Testing Infrastructure
> Reporter: Raghotham Murthy
>
> Right now MapRedTask does an exec on the hadoop command line. This prevents
> us from stepping through query execution code. If there were an option to run
> hadoop via MiniMR, this will create tasks within the same VM and so allows
> stepping into the execution code. See,
> src/test/org/apache/hadoop/mapred/TestMiniMRWithDFS.java in the hadoop source
> code for an example.
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