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From "Chris Burroughs (JIRA)" <>
Subject [jira] [Reopened] (CASSANDRA-2681) Upgrade ConcurrentLinkedHashMap (v1.2)
Date Wed, 15 Jun 2011 20:18:47 GMT


Chris Burroughs reopened CASSANDRA-2681:

Need to update in build.xml for the generated pom as well.

> Upgrade ConcurrentLinkedHashMap (v1.2)
> --------------------------------------
>                 Key: CASSANDRA-2681
>                 URL:
>             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.)
> 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).

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