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https://issues.apache.org/jira/browse/HADOOP-6332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12869351#action_12869351
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Konstantin Boudnik commented on HADOOP-6332:
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The main reason this has been done as a part of _test infrastructure_ for
Common (Hdfs, MR are coming) is that the framework is non-invasive and doesn't
have any footprint in the production code of Hadoop. However, system tests need
more functionality than a regular public API provides. To achieve this we had
to use AOP. For the very least, compiled aspects have to be provided and then
woven into Hadoop's classes. Framework part (aspects and all) might be kept
separate from the main code tree. But at any rate this means changes in the
build process. And it also will add a lot of complexity to the framework
development/maintenance.
> Large-scale Automated Test Framework
> ------------------------------------
>
> Key: HADOOP-6332
> URL: https://issues.apache.org/jira/browse/HADOOP-6332
> Project: Hadoop Common
> Issue Type: New Feature
> Components: test
> Affects Versions: 0.21.0
> Reporter: Arun C Murthy
> Assignee: Konstantin Boudnik
> Fix For: 0.22.0
>
> Attachments: 6332-phase2.fix1.patch, 6332-phase2.fix2.patch,
> 6332-phase2.patch, 6332.patch, 6332.patch, 6332.patch, 6332_v1.patch,
> 6332_v2.patch, HADOOP-6332-MR.patch, HADOOP-6332-MR.patch,
> HADOOP-6332.0.22.patch, HADOOP-6332.0.22.patch, HADOOP-6332.0.22.patch,
> HADOOP-6332.0.22.patch, HADOOP-6332.0.22.patch, HADOOP-6332.0.22.patch,
> HADOOP-6332.0.22.patch, HADOOP-6332.0.22.patch, HADOOP-6332.patch,
> HADOOP-6332.patch
>
>
> Hadoop would benefit from having a large-scale, automated, test-framework.
> This jira is meant to be a master-jira to track relevant work.
> ----
> The proposal is a junit-based, large-scale test framework which would run
> against _real_ clusters.
> There are several pieces we need to achieve this goal:
> # A set of utilities we can use in junit-based tests to work with real,
> large-scale hadoop clusters. E.g. utilities to bring up to deploy, start &
> stop clusters, bring down tasktrackers, datanodes, entire racks of both etc.
> # Enhanced control-ability and inspect-ability of the various components in
> the system e.g. daemons such as namenode, jobtracker should expose their
> data-structures for query/manipulation etc. Tests would be much more relevant
> if we could for e.g. query for specific states of the jobtracker, scheduler
> etc. Clearly these apis should _not_ be part of the production clusters -
> hence the proposal is to use aspectj to weave these new apis to
> debug-deployments.
> ----
> Related note: we should break up our tests into at least 3 categories:
> # src/test/unit -> Real unit tests using mock objects (e.g. HDFS-669 &
> MAPREDUCE-1050).
> # src/test/integration -> Current junit tests with Mini* clusters etc.
> # src/test/system -> HADOOP-6332 and it's children
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