Jeff Jirsa updated CASSANDRA-6758:
    Labels:   (was: proposed-wontfix)

> Measure data consistency in the cluster
> ---------------------------------------
>                 Key: CASSANDRA-6758
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6758
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Jimmy MÃ¥rdell
>            Priority: Minor
> Running multi-DC Cassandra can be a challenge as the cluster easily tends to 
> get out-of-sync. We have been thinking it would be nice to measure how out of 
> sync a cluster is and expose those metrics somehow.
> One idea would be to just run the first half of the repair process and output 
> the result of the differencer. If you use Random or the Murmur3 partitioner, 
> it should be enough to calculate the merkle tree over a small subset of the 
> ring as the result can be extrapolated.
> This could be exposed in nodetool. Either a separate command or perhaps a 
> dry-run flag to repair?
> Not sure about the output format. I think it would be nice to have one value 
> ("% consistent"?) within a DC, and also one value for every pair of DC's 
> perhaps?

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