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

["Sean Busbey (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-5313?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Busbey reassigned HBASE-5313:
----------------------------------

         Assignee:     (was: dhruba borthakur)
    Fix Version/s: 3.0.0
      Component/s: HFile

> Restructure hfiles layout for better compression
> ------------------------------------------------
>
>                 Key: HBASE-5313
>                 URL: https://issues.apache.org/jira/browse/HBASE-5313
>             Project: HBase
>          Issue Type: Improvement
>          Components: HFile, io
>            Reporter: dhruba borthakur
>            Priority: Major
>             Fix For: 3.0.0
>
>
> 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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