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https://issues.apache.org/jira/browse/BOOKKEEPER-303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13397396#comment-13397396
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Sijie Guo commented on BOOKKEEPER-303:
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good work, Ivan.
I haven't go thru all the patch. but just one question, why there are changes
about Hedwig PubSubProtocol?
> 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: 4.1.0
>
> Attachments: 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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