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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HBASE-975) Improve MapFile performance for start and end key
Date Tue, 04 Nov 2008 01:31:44 GMT

     [ 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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