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From "Erik Holstad (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-80) [hbase] Add a cache of 'hot' cells
Date Wed, 21 Jan 2009 21:09:59 GMT

    [ https://issues.apache.org/jira/browse/HBASE-80?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12665966#action_12665966

Erik Holstad commented on HBASE-80:

The planned layout for the cache is to keep the cache at the HRegionServer
level so that you set the amount of memory that you for each HRS.

Are planning to use a special HashMap that is memory sensitive and keeps track
of the used memory for the cache at every point and kicks entries whenever needed.

The harder thing to discuss and talk about is how and what kind of data that would be
best to store. For example if we want to store a query->result or if a HStoreKey ->
Cell schema will make better use of the memory.

All thought and comments are welcome!

> [hbase] Add a cache of 'hot' cells
> ----------------------------------
>                 Key: HBASE-80
>                 URL: https://issues.apache.org/jira/browse/HBASE-80
>             Project: Hadoop HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: stack
>            Assignee: Erik Holstad
>            Priority: Minor
>             Fix For: 0.20.0
>         Attachments: cache.patch

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