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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-288) Add in-memory caching of data
Date Tue, 01 Jul 2008 03:53:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12609433#action_12609433
] 

stack commented on HBASE-288:
-----------------------------

Joonbok: I thought this patch had already been applied (to hbase since 0.1 and the hadoop
portion to hadoop since 0.16.x?)  Is that why its not applying (Could be hard to figure it
because a lot has changed in hbase since 02/07/08).

> Add in-memory caching of data
> -----------------------------
>
>                 Key: HBASE-288
>                 URL: https://issues.apache.org/jira/browse/HBASE-288
>             Project: Hadoop HBase
>          Issue Type: Bug
>          Components: regionserver
>            Reporter: Jim Kellerman
>            Assignee: Tom White
>            Priority: Trivial
>             Fix For: 0.2.0
>
>         Attachments: commons-collections-3.2.jar, hadoop-blockcache-v2.patch, hadoop-blockcache-v3.patch,
hadoop-blockcache-v4.1.patch, hadoop-blockcache-v4.patch, hadoop-blockcache-v5.patch, hadoop-blockcache-v6.patch,
hadoop-blockcache-v7.patch, hadoop-blockcache.patch
>
>
> Bigtable provides two in-memory caches: one for row/column data and one for disk block
caches.
> The size of each cache should be configurable, data should be loaded lazily, and the
cache managed by an LRU mechanism.
> One complication of the block cache is that all data is read through a SequenceFile.Reader
which ultimately reads data off of disk via a RPC proxy for ClientProtocol. This would imply
that the block caching would have to be pushed down to either the DFSClient or SequenceFile.Reader

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