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From Andrey Ilinykh <ailin...@gmail.com>
Subject Re: Is Anti Entropy repair idempotent with respect to transferred data?
Date Tue, 16 Oct 2012 18:00:30 GMT
> In my experience running repair on some counter data, the size of
> streamed data is much bigger than the cluster could possibly have lost
> messages or would be due to snapshotting at different times.
>
> I know the data will eventually be in sync on every repair, but I'm
> more interested in whether Cassandra transfers excess data and how to
> minimize this.
>
> Does any body have insights on this?
>
The problem is in granularity of Merkle tree. Cassandra sends regions
which have different hash values. It could be much bigger then a
single row.

Andrey

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