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https://issues.apache.org/jira/browse/HADOOP-6332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12869707#action_12869707
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Doug Cutting commented on HADOOP-6332:
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> MR and HDFS today share lot of things from common like Configuration etc.
> Similarly Herriot's common functionality is abstracted and put in common.
Our long-term goal should probably be to diminish Common as a grab-bag of
shared bits of code for MR and HDFS. Rather, it would be better if the shared
bits were separate projects or subprojects that are independently useful. So,
if we think Herriot is of use beyond HDFS and MR then perhaps it ought to be a
separate project. Similarly, long-term, RPC and Configuration might eventually
become artifacts that other projects can use independently, rather than as a
part of Common.
> 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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