[jira] Resolved: (HBASE-975) Improve MapFile performance for start and end key

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

     [ https://issues.apache.org/jira/browse/HBASE-975?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

stack resolved HBASE-975.
-------------------------

    Resolution: Cannot Reproduce

Committed.

Primitive testing shows that we might actually be doing MORE seeks now with this patch in place (e.g. we open new Readers when we go to compact so we seek for for start and final keys we never use -- we also load in their indices for a second time so there is extra memory pressure during compactions).  Let me test some more.  I might back out the core of the patch that does the read of first and last keys but will leave the rest of the cleanup refactoring.  Also committing 'cos Jim wants to check his HBASE-964 fix.

> Improve MapFile performance for start and end key
> -------------------------------------------------
>
>                 Key: HBASE-975
>                 URL: https://issues.apache.org/jira/browse/HBASE-975
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: Jean-Daniel Cryans
>            Assignee: stack
>             Fix For: 0.19.0
>
>         Attachments: 975-v2.patch, 975-v4.patch, hbase-975.patch
>
>
> Keeping a MapFile's start and end key in cache would save us some seeks, see if it can be done.

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