hadoop-common-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-1986) Add support for a general serialization mechanism for Map Reduce
Date Wed, 17 Oct 2007 21:18:50 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-1986?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tom White updated HADOOP-1986:
------------------------------

    Attachment: serializer-v1.patch

Here's a patch (serializer-v1.patch) for discussion. It's still quite incomplete: there are
no tests or javadoc, it produces lots of warnings and I haven't looked at changing pipes or
aggregate to not depend on Writable.

That said, I've managed to run a MapReduce job that doesn't use Writables. (I created a wrapper
round Writable that didn't actually implement Writable, even though the underlying serialization
mechanism used Writable.) The next test is probably to try using Thrift types.

Thoughts?

> Add support for a general serialization mechanism for Map Reduce
> ----------------------------------------------------------------
>
>                 Key: HADOOP-1986
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1986
>             Project: Hadoop
>          Issue Type: New Feature
>          Components: mapred
>            Reporter: Tom White
>            Assignee: Tom White
>             Fix For: 0.16.0
>
>         Attachments: SerializableWritable.java, serializer-v1.patch
>
>
> Currently Map Reduce programs have to use WritableComparable-Writable key-value pairs.
While it's possible to write Writable wrappers for other serialization frameworks (such as
Thrift), this is not very convenient: it would be nicer to be able to use arbitrary types
directly, without explicit wrapping and unwrapping.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message