[jira] [Assigned] (CASSANDRA-19191) Optimisations to PlacementForRange, improve lookup on r/w path

["Marcus Eriksson (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-19191?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Marcus Eriksson reassigned CASSANDRA-19191:
-------------------------------------------

    Assignee: Marcus Eriksson

> Optimisations to PlacementForRange, improve lookup on r/w path
> --------------------------------------------------------------
>
>                 Key: CASSANDRA-19191
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-19191
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Transactional Cluster Metadata
>            Reporter: Marcus Eriksson
>            Assignee: Marcus Eriksson
>            Priority: Normal
>             Fix For: 5.1-alpha1
>
>
> The lookup used when selecting the appropriate replica group for a range or token while peforming reads and writes is extremely simplistic and inefficient. There is plenty of scope to improve {{PlacementsForRange}} to by replacing the current naive iteration with use a more efficient lookup.



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