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From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3788) Add serialization for Protocol Buffers
Date Fri, 12 Sep 2008 09:29:45 GMT

    [ 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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