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Date: Fri, 12 Sep 2008 02:29:45 -0700 (PDT)
From: "Tom White (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-3788) Add serialization for Protocol
 Buffers
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    [ https://issues.apache.org/jira/browse/HADOOP-3788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12630531#action_12630531 ] 

Tom White commented on HADOOP-3788:
-----------------------------------

bq. But reading until EOF seems a poor way of communicating this. Perhaps we could change the deserialize API to be optionally passed a length or somesuch.

+1

How about adding a method to Deserializer (an interface, sigh), which is called when the length of the serialized object is known:
{noformat}
T deserialize(T t, int length) throws IOException;
{noformat}

This still needs help from PB to work. I wonder if CodedInputStream#pushLimit() would do the trick?

> Add serialization for Protocol Buffers
> --------------------------------------
>
>                 Key: HADOOP-3788
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3788
>             Project: Hadoop Core
>          Issue Type: Wish
>          Components: examples, mapred
>    Affects Versions: 0.19.0
>            Reporter: Tom White
>            Assignee: Alex Loddengaard
>             Fix For: 0.19.0
>
>         Attachments: hadoop-3788-v1.patch, hadoop-3788-v2.patch, protobuf-java-2.0.1.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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