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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-965) Implement BlockCache using custom LRU/ARC mechanism rather than SoftReferences
Date Wed, 29 Oct 2008 18:30:44 GMT

     [ https://issues.apache.org/jira/browse/HBASE-965?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack updated HBASE-965:
------------------------

    Fix Version/s:     (was: 0.19.0)
                   0.20.0

Moving out of 0.19.0.

> Implement BlockCache using custom LRU/ARC mechanism rather than SoftReferences
> ------------------------------------------------------------------------------
>
>                 Key: HBASE-965
>                 URL: https://issues.apache.org/jira/browse/HBASE-965
>             Project: Hadoop HBase
>          Issue Type: New Feature
>    Affects Versions: 0.19.0
>            Reporter: Jonathan Gray
>            Priority: Minor
>             Fix For: 0.20.0
>
>
> BlockCaching is now turned on by default as of HBASE-953.  This improves all-around performance
but is very taxing on the GC.  Random reading tends to thrash the cache.
> As discussed, rather than rely on JVM LRU GC, we should implement our own tracking of
cached blocks using an ARC-like algorithm.  This will also allow users to set the cache size
per-table or per-family rather than just taking from the allotted Heap pool.
> Paper on ARC algorithm (a scan-resistant LRU):  http://www.almaden.ibm.com/cs/people/dmodha/ARC.pdf

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