Sylvain Lebresne created CASSANDRA-7450:
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Summary: Make repair -pr work within a datacenter
Key: CASSANDRA-7450
URL: https://issues.apache.org/jira/browse/CASSANDRA-7450
Project: Cassandra
Issue Type: Improvement
Reporter: Sylvain Lebresne
Assignee: Yuki Morishita
As was noticed in CASSANDRA-7317, using '-pr' alongside '-local' for repair
doesn't really work properly, and disabling the combination was definitively
the right short time fix. However, the main goal of '-pr' is to make it easy to
repair a full cluster without doing any duplication of work. Doing the same
only within a data-center is obviously desirable.
I think a reasonably simple solution would be modify the behavior of '-pr' when
it's limited to only one DC. If applied to nodeX in dcY, instead of repairing
only the "primary" range of nodeX for the whole ring, we'll repair that range
but also all ranges that are "primary" for a node not in dcY and for which
nodeX is the first node of dcY found in ring order. Basically we'll ensure that
running 'repair -local -pr' on every nodes of a given DC will repair all ranges
for the nodes of that DC without repairing the same range twice.
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