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From Adam Kocoloski <kocol...@apache.org>
Subject Re: Opacity of Seq
Date Fri, 05 Mar 2010 19:26:53 GMT
On Mar 5, 2010, at 2:17 PM, Randall Leeds wrote:

> Now seems like a good time to raise this issue:
> 
> Right now the replication code assumes sequence tokens from the source
> are integers and I think this is wrong. It prevents replication from
> the Lounge, but beyond my personal interest there it feels to me like
> it should be an opaque token. It's necessary to know their arrival
> order so that it's clear what the highest fully replicated seq is when
> making checkpoints. Enumerating these tokens and zipping them in
> tuples means they can be compared as before but without making
> assumptions about the type of the tokens themselves.
> 
> Before I set about on the patch, how would people feel about a change
> like this? The format of the actual checkpoint document won't change
> (only the HighSeq calculations in the replication code and some
> zipping/unzipping in places).
> 
> Randall

Absolutely, I didn't realize the replicator actually failed if the seqnum was not an integer.
 Preserving the arrival order of the tokens is a good thing.  Best,

Adam


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