Jimmy Mårdell created CASSANDRA-8193:
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Summary: Multi-DC parallel snapshot repair
Key: CASSANDRA-8193
URL: https://issues.apache.org/jira/browse/CASSANDRA-8193
Project: Cassandra
Issue Type: Improvement
Reporter: Jimmy Mårdell
Priority: Minor
The current behaviour of snapshot repair is to let one node at a time calculate
a merkle tree. This is to ensure only one node at a time is doing the expensive
calculation. The drawback is that it takes even longer time to do the merkle
tree calculation.
In a multi-DC setup, I think it would make more sense to have one node in each
DC calculate the merkle tree at the same time. This would yield a significant
improvement when you have many data centers.
I'm not sure how relevant this is in 2.1, but I don't see us upgrading to 2.1
any time soon. Unless there is an obvious drawback that I'm missing, I'd like
to implement this in the 2.0 branch.
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