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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-621) Exposing MiniDFS and MiniMR clusters as a single process command-line
Date Tue, 15 Sep 2009 22:25:57 GMT

    [ https://issues.apache.org/jira/browse/HDFS-621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12755743#action_12755743
] 

Tsz Wo (Nicholas), SZE commented on HDFS-621:
---------------------------------------------

> If you would, take a quick look to see how I use MiniMRCluster. Do you feel I'm abusing
the fact that hdfs-hdfswithmr-test exists?

No more mapreduce codes in hdfs, please.  Having hdfs-with-mr in hdfs is a mistake.  It leads
to a circular dependence.  Indeed, we should move hdfs-with-mr to mapreduce.


> Exposing MiniDFS and MiniMR clusters as a single process command-line
> ---------------------------------------------------------------------
>
>                 Key: HDFS-621
>                 URL: https://issues.apache.org/jira/browse/HDFS-621
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: test, tools
>            Reporter: Philip Zeyliger
>            Assignee: Philip Zeyliger
>            Priority: Minor
>         Attachments: HDFS-621.patch
>
>
> It's hard to test non-Java programs that rely on significant mapreduce functionality.
 The patch I'm proposing shortly will let you just type "bin/hadoop jar hadoop-hdfs-hdfswithmr-test.jar
minicluster" to start a cluster (internally, it's using Mini{MR,HDFS}Cluster) with a specified
number of daemons, etc.  A test that checks how some external process interacts with Hadoop
might start minicluster as a subprocess, run through its thing, and then simply kill the java
subprocess.
> I've been using just such a system for a couple of weeks, and I like it.  It's significantly
easier than developing a lot of scripts to start a pseudo-distributed cluster, and then clean
up after it.  I figure others might find it useful as well.
> I'm at a bit of a loss as to where to put it in 0.21.  hdfs-with-mr tests have all the
required libraries, so I've put it there.  I could conceivably split this into "minimr" and
"minihdfs", but it's specifically the fact that they're configured to talk to each other that
I like about having them together.  And one JVM is better than two for my test programs.

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