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Date: Tue, 12 Feb 2008 10:59:08 -0800 (PST)
From: "Bryan Duxbury (JIRA)" <jira@apache.org>
To: hbase-dev@hadoop.apache.org
Subject: [jira] Updated: (HBASE-407) Client should cache region locations in
 an LRU structure
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     [ https://issues.apache.org/jira/browse/HBASE-407?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bryan Duxbury updated HBASE-407:
--------------------------------

    Attachment: 407-v4.patch

Removed unneeded imports and comments from HConnectionManager, moved declaration of cachedRegionLocations all to one place. 

Cleaned bookend debug logging from SoftSortedMap, and improved get and remove so that they can handle nulls better. 

If the GC nulls a reference between checkReferences and the actual get, it doesn't matter; the SoftValue will still be in the map, and get() will return null. However, I wasn't taking into account the situation when the key being checked for actually wasn't in the map, so that could have let to some NPEs.

> Client should cache region locations in an LRU structure
> --------------------------------------------------------
>
>                 Key: HBASE-407
>                 URL: https://issues.apache.org/jira/browse/HBASE-407
>             Project: Hadoop HBase
>          Issue Type: Improvement
>          Components: client
>            Reporter: Bryan Duxbury
>            Assignee: Bryan Duxbury
>         Attachments: 407-v2.patch, 407-v3.patch, 407-v4.patch, 407.patch
>
>
> Instead of keeping the region locations cached client side in a TreeMap, we should use an LRU mechanism to help manage memory more dynamically.

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