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From "Jake Mannix (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAHOUT-1236) Need a cleaned up serialized format for Vectors to handle names and all other kinds of things
Date Sat, 01 Jun 2013 18:28:20 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-1236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13672188#comment-13672188
] 

Jake Mannix commented on MAHOUT-1236:
-------------------------------------

Why protobufs?  Why not thrift or avro?  Maybe we should make this pluggable?
                
> Need a cleaned up serialized format for Vectors to handle names and all other kinds of
things
> ---------------------------------------------------------------------------------------------
>
>                 Key: MAHOUT-1236
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1236
>             Project: Mahout
>          Issue Type: Bug
>            Reporter: Ted Dunning
>
> Our current serialization is subject several ills
> a) it breaks alignment by having a 1 byte flag field (evil, generic)
> b) it doesn't handle any kind of extensible format like protobufs so it isn't future-proof
> c) it doesn't handle named vectors very well
> d) it totally breaks with any other kind of decoration as with Centroids or WeightedVector
or ... (see b)
> I propose that we use the current tag byte on the current serialization with a new flag
bit that indicates that the vector will use a protobuf encoding.  Then 3 bytes will be skipped
to restore alignment.  Then there will be a protobuf encoding for the vector. 

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