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https://issues.apache.org/jira/browse/CASSANDRA-9999?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tommy Stendahl updated CASSANDRA-9999:
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Attachment: 9999.txt
> 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
> Attachments: 9999.txt
>
>
> 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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