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https://issues.apache.org/jira/browse/HADOOP-1398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12561191#action_12561191
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stack commented on HADOOP-1398:
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Patch looks good Tom. I changed my mind since IRC this morning. Now I think
hbase should align with the parent and not add new features since feature
freeze untill after we make the 0.16 branch (Kick me on IRC if you think
different).
> Add in-memory caching of data
> -----------------------------
>
> Key: HADOOP-1398
> URL: https://issues.apache.org/jira/browse/HADOOP-1398
> Project: Hadoop
> Issue Type: New Feature
> Components: contrib/hbase
> Reporter: Jim Kellerman
> Priority: Trivial
> 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.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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