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https://issues.apache.org/jira/browse/HBASE-5313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13222550#comment-13222550
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Matt Corgan commented on HBASE-5313:
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Just noticed this jira. I've been working on
https://issues.apache.org/jira/browse/HBASE-4676. In this trie format all the
values are concatenated at the end of the block. I haven't done anything with
compressing them because they are generally small in my use cases, but seems
like it would eventually be a good option. I would think that the compression
savings would be similar to the on-disk compression savings, but the benefit is
that you have access to scan the keys while the data part of the block is still
compressed.
> Restructure hfiles layout for better compression
> ------------------------------------------------
>
> Key: HBASE-5313
> URL: https://issues.apache.org/jira/browse/HBASE-5313
> Project: HBase
> Issue Type: Improvement
> Components: io
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
>
> A HFile block contain a stream of key-values. Can we can organize these kvs
> on the disk in a better way so that we get much greater compression ratios?
> One option (thanks Prakash) is to store all the keys in the beginning of the
> block (let's call this the key-section) and then store all their
> corresponding values towards the end of the block. This will allow us to
> not-even decompress the values when we are scanning and skipping over rows in
> the block.
> Any other ideas?
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