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From "sankalp kohli (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-6566) Differencer should not run in AntiEntropy Stage
Date Fri, 10 Jan 2014 01:25:50 GMT
sankalp kohli created CASSANDRA-6566:
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             Summary: Differencer should not run in AntiEntropy Stage
                 Key: CASSANDRA-6566
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6566
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: sankalp kohli
            Priority: Minor


The Differencing currently runs in AntiEntropy stage. When there are lot of ranges which do
not match, it takes sometime to compute the diff in ranges. Also with increase in Merkle tree
height it will take even more time in case of large diffs. 

This causes other things to get blocked behind this. 
Also no other repair messages can be processed.  
Example: If a node is doing differencing for a repair, and Validation compaction is done for
another repair, it needs to block to send the tree over till Differencing is done.  



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