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From "Chris Dyer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3788) Add serialization for Protocol Buffers
Date Thu, 20 Nov 2008 22:16:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12649503#action_12649503
] 

Chris Dyer commented on HADOOP-3788:
------------------------------------

Other pieces of my system are using protocol buffers already, so I'm stuck with it for the
pieces that have to interact with Hadoop.  I am currently using HadoopStreaming, but the hoops
I jump through are quite extensive- I serialize the protocol buffer to byte arrays and then
encode them using base64 so that they can be put into Streaming's text format's key-value
pair encoding, where the key is separated from the value by a tab and the record is terminated
with a newline.  These extra layers aren't really a problem since what i'm computing is computationally
quite expensive (i could serialize to XML and it would be just a drop in the bucket in terms
of running time).  But, it does complicate my code in ways I think should be unnecessary.
 There is a paucity of information for how to use streaming with non-text data, so I haven't
really been able to figure out of there's an easier way to do all of this.

> Add serialization for Protocol Buffers
> --------------------------------------
>
>                 Key: HADOOP-3788
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3788
>             Project: Hadoop Core
>          Issue Type: Wish
>          Components: contrib/serialization, examples, mapred
>            Reporter: Tom White
>            Assignee: Alex Loddengaard
>             Fix For: 0.20.0
>
>         Attachments: hadoop-3788-v1.patch, hadoop-3788-v2.patch, hadoop-3788-v3.patch,
protobuf-java-2.0.1.jar, protobuf-java-2.0.2.jar
>
>
> Protocol Buffers (http://code.google.com/p/protobuf/) are a way of encoding data in a
compact binary format. This issue is to write a ProtocolBuffersSerialization to support using
Protocol Buffers types in MapReduce programs, including an example program. This should probably
go into contrib. 

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