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Posted to dev@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2009/01/18 00:24:59 UTC
[jira] Commented: (HBASE-965) Implement BlockCache using custom
LRU/ARC mechanism rather than SoftReferences
[ https://issues.apache.org/jira/browse/HBASE-965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12664882#action_12664882 ]
stack commented on HBASE-965:
-----------------------------
See HBASE-1127 for some issues with Soft References.
> 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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