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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6311) Add support for unix domain sockets to JNI libs
Date Tue, 13 Oct 2009 17:37:31 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12765161#action_12765161
] 

Todd Lipcon commented on HADOOP-6311:
-------------------------------------

bq. This might be acceptable if you can get the Android project to make releases that we can
use. (Or if they split it out into a stand alone project that they also use...)

I think there's little chance of this. The original code has (a) some android specific things
like a special android socket namespace, (b) reliance on their custom build system, and (c)
reliance on a bunch of other utility code elsewhere in Android. This is also such a small
part of Android that I am confident they'd have no interest in splitting it out to a separate
library - it would just be a waste of time for them.

Regarding maintenance and bugs, I think if you look at the code you'll see that it's not super
complicated; obviously there's always a chance for bugs, especially on different platforms,
but I don't see this code evolving much from where it is today (in Android it has had only
one edit in the year since it was contributed). Also, since Android targets a very specific
platform (and specific nonstandard JVM, even) I don't think we'd see the same bugs they would
in practice.

bq. until we have another use of unix domain sockets within Hadoop, or at least have another
expected use, keep the code with its single user in HDFS.

I put this code in common since that's the easiest integration point for additional native
code. If I were to put it in an entirely separate JNI library, we'd have to make changes to
(or duplicate) NativeCodeLoader, ask users to install multiple native libraries, add appropriate
build infrastructure to the hdfs build, etc. I think it makes most sense to have a single
"native-code based optimizations" library that contains these optional extensions in common
even if there is currently only a single user.

> Add support for unix domain sockets to JNI libs
> -----------------------------------------------
>
>                 Key: HADOOP-6311
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6311
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: native
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hadoop-6311.txt
>
>
> For HDFS-347 we need to use unix domain sockets. This JIRA is to include a library in
common which adds a o.a.h.net.unix package based on the code from Android (apache 2 license)

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