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Date: Sun, 3 May 2009 15:05:30 -0700 (PDT)
From: "Jonathan Gray (JIRA)" <jira@apache.org>
To: hbase-dev@hadoop.apache.org
Subject: [jira] Commented: (HBASE-1192) LRU-style map for the block cache
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    [ https://issues.apache.org/jira/browse/HBASE-1192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12705458#action_12705458 ] 

Jonathan Gray commented on HBASE-1192:
--------------------------------------

Hopefully we do see this much concurrency on the block cache.  I read all the solr code, it looks solid.  I'd like to try to keep our initial implementation as simple as we can, so will probably take hints from their implementation but write our own.

I am going to be working on HBase stuff second half of this week.  I will take their code for a spin and do some benchmarking/tests.  I think we should back the block cache with a concurrenthashmap, will try to get a patch up by friday.

> LRU-style map for the block cache
> ---------------------------------
>
>                 Key: HBASE-1192
>                 URL: https://issues.apache.org/jira/browse/HBASE-1192
>             Project: Hadoop HBase
>          Issue Type: New Feature
>          Components: regionserver
>            Reporter: Jonathan Gray
>            Assignee: ryan rawson
>            Priority: Blocker
>             Fix For: 0.20.0
>
>         Attachments: hbase-1192-v1.patch, hbase-1192-v2.patch, hbase-1192-v3.patch
>
>
> We need to decide what structure to use to back the block cache.  The primary decision is whether to continue using SoftReferences or to build our own structure.

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