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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
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Pete Wyckoff commented on HADOOP-3788:
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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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