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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6332) Large-scale Automated Test Framework
Date Thu, 20 May 2010 18:21:40 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12869707#action_12869707
] 

Doug Cutting commented on HADOOP-6332:
--------------------------------------

>  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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