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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-2500) Block indexes and meta blocks should be put into the LRU
Date Tue, 05 Oct 2010 21:47:32 GMT

     [ https://issues.apache.org/jira/browse/HBASE-2500?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Gray updated HBASE-2500:
---------------------------------

    Fix Version/s:     (was: 0.90.0)
                   0.92.0

This really should be done, but punting to 0.92 because won't be done in time for 0.90.

> Block indexes and meta blocks should be put into the LRU
> --------------------------------------------------------
>
>                 Key: HBASE-2500
>                 URL: https://issues.apache.org/jira/browse/HBASE-2500
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: Jonathan Gray
>            Assignee: Nicolas Spiegelberg
>            Priority: Minor
>             Fix For: 0.92.0
>
>
> Currently we are not tracking the heap usage of block indexes.  We're just relying on
the fact that we leave a large percentage of total heap as part of "everything else" not in
memstores or the block cache.  The "everything else" portion should be left for ephemeral/transient
memory usage, not long-lived objects like block indexes.  Introduction of blooms will extend
this issue to meta blocks in general.
> All of this should be moved into an LRU.  Either the existing block cache LRU or a new
LRU.

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