[jira] [Created] (CASSANDRA-5972) Reduce the amount of data to be transferred during repair

["Jacek Lewandowski (JIRA)" <ji...@apache.org>]

Jacek Lewandowski created CASSANDRA-5972:
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             Summary: Reduce the amount of data to be transferred during repair
                 Key: CASSANDRA-5972
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5972
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: Jacek Lewandowski
            Priority: Minor


Currently, when a validator finds a token range different in n replicas, data streams are initiated simultaneously between each possible pair of these n nodes, in both directions. It yields n*(n-1) data stream in total. 

It can be done in a sequence - R(1) -> R(2), R(2) -> R(3), ... , R(n-1) -> R(n). After this process, the data in R(n) are up to date. Then, we continue: R(n) -> R(1), R(1) -> R(2), ... , R(n-2) -> R(n-1). The active repair is done after 2*(n-1) data transfers performed sequentially in 2*(n-1) steps.





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