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From "Jeremy Hanna (JIRA)" <j...@apache.org>
Subject [jira] Created: (CASSANDRA-1037) Improve load balancing to take into account load in terms of operations
Date Thu, 29 Apr 2010 20:24:54 GMT
Improve load balancing to take into account load in terms of operations
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                 Key: CASSANDRA-1037
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1037
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Jeremy Hanna
            Priority: Minor


Currently in cassandra, the load balancing takes into account disk space.  When using an order-preserving
partitioner, there can be hot spots in the various ranges of tokens in terms of operations.
 We would like to propose improving the load balancing so that it takes that the number of
operations into account.

There are two places where this can be handled:

1. when the cluster decides on which nodes need to be balanced out.
2. how to balance an individual node - where to split

For number 1, the number of operations that a node performed could be factored in to how important
it is to balance that node.

For number 2, we are already using a midpoint in the node when trying to load balance with
respect to space.  We would propose adding a weight to the midpoint to lean towards splitting
so that the operational load could be better handled, not just space.

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