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From "Ted Yu (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-4752) Don't create an unnecessary LinkedList when evicting from the BlockCache
Date Sun, 06 Nov 2011 05:54:51 GMT

     [ https://issues.apache.org/jira/browse/HBASE-4752?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ted Yu updated HBASE-4752:
--------------------------

    Status: Patch Available  (was: Open)

The following tests passed based on patch for TRUNK:
{code}
src/test/java/org/apache/hadoop/hbase/io/hfile/TestBlockCacheColumnFamilySummary.java
src/test/java/org/apache/hadoop/hbase/io/hfile/TestLruBlockCache.java
src/test/java/org/apache/hadoop/hbase/regionserver/TestStoreFileBlockCacheSummary.java
{code}
                
> Don't create an unnecessary LinkedList when evicting from the BlockCache
> ------------------------------------------------------------------------
>
>                 Key: HBASE-4752
>                 URL: https://issues.apache.org/jira/browse/HBASE-4752
>             Project: HBase
>          Issue Type: Improvement
>          Components: performance, regionserver
>    Affects Versions: 0.90.4
>            Reporter: Benoit Sigoure
>            Assignee: Benoit Sigoure
>            Priority: Minor
>         Attachments: 0001-HBASE-4752-Don-t-create-an-unnecessary-LinkedList-wh.patch,
4752-trunk.txt
>
>
> When evicting from the BlockCache, the code creates a LinkedList containing every single
block sorted by access time.  This list is created from a PriorityQueue.  I don't believe
it is necessary, as the PriorityQueue can be used directly.

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