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https://issues.apache.org/jira/browse/HBASE-5388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13207258#comment-13207258
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Zhihong Yu commented on HBASE-5388:
-----------------------------------
lower() isn't in NavigableMap or TreeMap.
And the name is not informative.
> 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, 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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