[jira] [Commented] (HBASE-5313) Restructure hfiles layout for better compression

["dhruba borthakur (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-5313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13202127#comment-13202127 ] 

dhruba borthakur commented on HBASE-5313:
-----------------------------------------

One option listed above is to keep all the keys in the beginning of the block and all the values in the end of the block. The keys will still be delta-encoded. The values can be lzo-compressed.

any other ideas out there?
                
> 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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