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Date: Fri, 12 Sep 2008 15:51:44 -0700 (PDT)
From: "Pete Wyckoff (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=12630701#action_12630701 ] 

Pete Wyckoff commented on HADOOP-3788:
--------------------------------------

bq. could imagine the deserializers being handed a special kind of stream that counts down the remaining bytes and then signals EOF.

One problem i ran into related to this is what if your deserializer does buffering?  For EOF, one can return null from deserialize or in theory throw EOFException :(, but for getProgress, RecordReader's use getPos which is off if the deserializer has its own buffers. e.g., if you were to implement LineReaderDeserializer using LineRecordReader.LineReader.

-- pete


> 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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