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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CASSANDRA-2681) Upgrade ConcurrentLinkedHashMap (v1.2)
Date Thu, 16 Jun 2011 17:11:47 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-2681?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis resolved CASSANDRA-2681.
---------------------------------------

    Resolution: Fixed

s/1.1/1.2/ in r1136547.  If it's more complicated than that please submit a patch. :)

> Upgrade ConcurrentLinkedHashMap (v1.2)
> --------------------------------------
>
>                 Key: CASSANDRA-2681
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2681
>             Project: Cassandra
>          Issue Type: Task
>          Components: Core
>            Reporter: Ben Manes
>            Assignee: Jonathan Ellis
>            Priority: Minor
>             Fix For: 1.0
>
>
> This release has numerous performance improvements. See the change log for details.
> It also includes a few useful features that may be of interest,
> - Snapshot iteration in order of hotness (CASSANDRA-1966)
> - Optionally defer LRU maintenance penalty to a background executor (instead of amortized
on caller threads) (Note that this setting is not advised if write storms are not rate limited,
since it defers eviction until the executor runs.)
> http://code.google.com/p/concurrentlinkedhashmap/
> http://code.google.com/p/concurrentlinkedhashmap/wiki/ExampleUsage
> Verified compatibility with NonBlockingHashMap. Cassandra may want to consider adding
the java_util_concurrent_chm.jar to the bootclasspath to swap all CHM usages with NBHM (CLHM
is a decorator on top of CHM).
> http://high-scale-lib.cvs.sourceforge.net/viewvc/high-scale-lib/high-scale-lib/README

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