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https://issues.apache.org/jira/browse/BOOKKEEPER-303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13402052#comment-13402052
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Ivan Kelly commented on BOOKKEEPER-303:
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For the C++ client, you need the protobuf library installed, as well as other
dependencies, so requiring protoc isn't too much (I should install with library
anyhow). But for java, protobuf comes as a mvn dependency. So, for C++,
generating the files doesn't add extra overhead. For java it does.
> LedgerMetadata should serialized using protobufs
> ------------------------------------------------
>
> Key: BOOKKEEPER-303
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-303
> Project: Bookkeeper
> Issue Type: Bug
> Reporter: Ivan Kelly
> Assignee: Ivan Kelly
> Fix For: 4.2.0
>
> Attachments: BOOKKEEPER-303.diff, BOOKKEEPER-303.diff,
> BOOKKEEPER-303.diff, BOOKKEEPER-303.diff
>
>
> Google protobufs is a library for serializing and deserializing data. It
> elegantly handles the cases where new data is added to a data format. This is
> useful in the case of something like LedgerMetadata, which may change over
> time. However, at the moment, whenever we make a change to the LedgerMetadata
> serialization format we have to break compatibility with old clients. By
> using protobufs, even if we add something to the format, old clients should
> be able to read the ledgers.
> We should also change our protocols to use protobufs for the same reason, but
> this should be done in 4.3.0.
> http://code.google.com/p/protobuf/
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