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Posted to issues@hbase.apache.org by "Zhihong Yu (Commented) (JIRA)" <ji...@apache.org> on 2012/02/12 14:57:00 UTC
[jira] [Commented] (HBASE-5388) tunning getCachedLocation method
[ https://issues.apache.org/jira/browse/HBASE-5388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13206417#comment-13206417 ]
Zhihong Yu commented on HBASE-5388:
-----------------------------------
@Ronghai:
Can you upload a patch ?
The improvement is measured in execution time, right ?
> tunning getCachedLocation method
> --------------------------------
>
> Key: HBASE-5388
> URL: https://issues.apache.org/jira/browse/HBASE-5388
> Project: HBase
> Issue Type: Improvement
> Reporter: ronghai.ma
>
> About 75% improvement。
> 1. Add a method in SoftValueSortedMap
> public synchronized <K, V> Entry<K, V> lowerEntry(K key) {
> return ((TreeMap) this.internalMap).lowerEntry(key);
> }
> 2. Modify getCachedLocation
> Map.Entry<byte[], HRegionLocation> tEntry = tableLocations.lowerEntry(row);
> if (tEntry != null) {
> HRegionLocation possibleRegion = tEntry.getValue();
> //other code
> }
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