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From "Benedict (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-11452) Cache implementation using LIRS eviction for in-process page cache
Date Fri, 15 Apr 2016 10:39:25 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-11452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15242781#comment-15242781
] 

Benedict commented on CASSANDRA-11452:
--------------------------------------

Just to clarify a mistake in the comments I wrote when hacking this together:

The distribution you printed was more correct (obviously, since it was empirical).  I only
applied the division by 2 effect to the 0 bucket.  The progression is obviously 75%, 18.25%,
4.76%... (if I've just done my mental arithmetic properly).  It's the 1/2^N progression with
pairs of probabilities merged into 1 (by the division by 2).

> Cache implementation using LIRS eviction for in-process page cache
> ------------------------------------------------------------------
>
>                 Key: CASSANDRA-11452
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11452
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Local Write-Read Paths
>            Reporter: Branimir Lambov
>            Assignee: Branimir Lambov
>
> Following up from CASSANDRA-5863, to make best use of caching and to avoid having to
explicitly marking compaction accesses as non-cacheable, we need a cache implementation that
uses an eviction algorithm that can better handle non-recurring accesses.



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