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https://issues.apache.org/jira/browse/HBASE-1218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12725856#action_12725856
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Jonathan Gray commented on HBASE-1218:
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The LRU in trunk now supports in-memory blocks.
In HFile.Reader.readBlock(int) we need to change cache.cacheBlock(blockName,
blockBuf) to cache.cacheBlock(blockName, blockBuf, boolean inMemory).
HFile.Reader gets instantiated from within a Store so should be easy enough to
pass something in from the family configuration there.
I strongly recommend lazy-loading, no pre-fetching of blocks. That's how they
do it in big table. If you want to warm the blocks, just scan the table.
> Implement in-memory column
> --------------------------
>
> Key: HBASE-1218
> URL: https://issues.apache.org/jira/browse/HBASE-1218
> Project: Hadoop HBase
> Issue Type: New Feature
> Reporter: stack
> Assignee: ryan rawson
> Fix For: 0.20.0
>
>
> HCD already talks of in-memory columns; its just not implemented. With hfile
> this should now be possible -- if set, read in the whole storefile and serve
> from the blockbuffer.
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