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From "Tommy Stendahl (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-9999) Improve usage of HashMap and HashSet in NetworkTopologyStrategy
Date Thu, 06 Aug 2015 11:18:04 GMT
Tommy Stendahl created CASSANDRA-9999:
-----------------------------------------

             Summary: Improve usage of HashMap and HashSet in NetworkTopologyStrategy
                 Key: CASSANDRA-9999
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9999
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Tommy Stendahl
            Assignee: Tommy Stendahl
            Priority: Minor


In NetworkTopologyStrategy there are HashMaps and HashSets created with a specified initial
size. I assume that this is done avoid having them re sized then when objects are inserted
to them. Unfortunately they are created with the size of the expected number of object that
will be inserted into them. Since the default load factor is 0.75 this will almost guarantee
that HashMaps and HashSets are re sized, to avoid re size the initial size should be set to
"no of objects / 0.75 +1".

Since this is done every time calculateNaturalEndpoints() is called this might have some performance
impact.



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