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Date: Tue, 14 Feb 2012 00:54:59 +0000 (UTC)
From: "Zhihong Yu (Updated) (JIRA)" <jira@apache.org>
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Subject: [jira] [Updated] (HBASE-5388) Tuning
 HConnectionManager#getCachedLocation method
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     [ https://issues.apache.org/jira/browse/HBASE-5388?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zhihong Yu updated HBASE-5388:
------------------------------

    Comment: was deleted

(was: -1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12514303/SoftValueSortedMap.java
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    -1 patch.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/945//console

This message is automatically generated.)
    
> Tuning HConnectionManager#getCachedLocation method
> --------------------------------------------------
>
>                 Key: HBASE-5388
>                 URL: https://issues.apache.org/jira/browse/HBASE-5388
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.90.5
>            Reporter: ronghai.ma
>            Assignee: ronghai.ma
>              Labels: patch
>             Fix For: 0.94.0
>
>         Attachments: 5388-v2.txt, 5388-v3.txt, 5388-v4.txt, 5388-v5.txt, 5388-v6.txt, HConnectionManager.java, SoftValueSortedMap.java, SoftValueSortedMap.java
>
>
> About 75% improvement in execution time.
> 1. Add the following method in SoftValueSortedMap:
> {code}
> public synchronized <K, V> Entry<K, V> lowerEntry(K key) {
>   return ((TreeMap) this.internalMap).lowerEntry(key);
> }
> {code}
> 2. Modify getCachedLocation:
> {code} 
> Map.Entry<byte[], HRegionLocation> tEntry = tableLocations.lowerEntry(row);
>   if (tEntry != null) {
>   HRegionLocation possibleRegion = tEntry.getValue();
>   //other code
> }
> {code}

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