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Posted to issues@hbase.apache.org by "Ted Yu (JIRA)" <ji...@apache.org> on 2012/11/15 00:30:13 UTC
[jira] [Commented] (HBASE-7163) Change cachedRegionsLocations in
HConnectionManager from SoftValueSortedMap to ConcurrentSkipListMap
[ https://issues.apache.org/jira/browse/HBASE-7163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13497584#comment-13497584 ]
Ted Yu commented on HBASE-7163:
-------------------------------
@Karthik:
The second snippet contains your proposed change.
Were you referring to the following code in getCachedLocation() ?
{code}
// Cut the cache so that we only get the part that could contain
// regions that match our key
SortedMap<byte[], HRegionLocation> matchingRegions =
tableLocations.headMap(row);
{code}
Thanks
> Change cachedRegionsLocations in HConnectionManager from SoftValueSortedMap to ConcurrentSkipListMap
> ----------------------------------------------------------------------------------------------------
>
> Key: HBASE-7163
> URL: https://issues.apache.org/jira/browse/HBASE-7163
> Project: HBase
> Issue Type: Sub-task
> Reporter: Karthik Ranganathan
> Assignee: Karthik Ranganathan
>
> This change saves 15% CPU on the client side per profiling. In using the ConcurrentSkipListMap, we can do:
> tableLocations.floorEntry(row).getValue()
> instead of doing:
> SortedMap<byte[], HRegionLocation> matchingRegions =
> tableLocations.floorEntry(row).getValue();
> if (!matchingRegions.isEmpty()) {
> HRegionLocation possibleRegion =
> matchingRegions.get(matchingRegions.lastKey());
> }
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