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From "Jun Rao (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-259) LRU cache for key positions
Date Wed, 01 Jul 2009 22:38:47 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-259?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12726249#action_12726249
] 

Jun Rao commented on CASSANDRA-259:
-----------------------------------

Some minor comments:
1. Need to make it clear that the new config para keyCacheSize is in percentage of # of keys.
Change it to keyCacheSizeInPCT?
2. Make SSTable an abstract class.

The bigger questions:  Do we plan to cache the column values themselves at CFS level? This
seems to be the more effective caching mechanism. Will caching at CFS level obviate the need
for caching key positions or do we want to support caching in multiple levels?

> LRU cache for key positions
> ---------------------------
>
>                 Key: CASSANDRA-259
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-259
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>         Attachments: 0001-CASSANDRA-259-encapsulate-bloom-filter-access-into-sst.txt,
0002-add-concurrentlinkedhashmap-cache-and-config-option.txt, 0003-refactor-sstable-into-SSTable-SSTableReader-and-SSTa.txt,
0004-per-table-cache-size.txt
>
>
> add cache like the old touch cache, but working :)
> this will mitigate the performance hit from CASSANDRA-223

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