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From "Stu Hood (JIRA)" <j...@apache.org>
Subject [jira] Created: (CASSANDRA-1577) Split gossiped load into 'primary' and 'total'
Date Tue, 05 Oct 2010 19:49:32 GMT
Split gossiped load into 'primary' and 'total'
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                 Key: CASSANDRA-1577
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1577
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: Stu Hood
             Fix For: 0.7.0


Bootstrap and load balancing decisions are currently made using the total load on a node,
as opposed to data the node is primarily responsible for due to a token hashing to its local
range. The latter number is the only reasonable number to be load balancing on, since ReplicationStrategies
can make arbitrary numbers of hops on the ring to find additional places to put replicas.

To find the primary load efficiently, we can use the SSTableReader.getPositionsForRanges method,
although we should probably move the load calculation outside of the atomic swap in SSTableTracker.

The format of the serialized 'LOAD' gossip state will need to change in a backwards incompatible
fashion.

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