Jimmy Mårdell created CASSANDRA-6758:
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Summary: 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 Mårdell
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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