[
https://issues.apache.org/jira/browse/HBASE-13378?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
John Leach updated HBASE-13378:
-------------------------------
Attachment: HBASE-13378.txt
Added patch HBASE-13378.txt that removes scans with
IsolationLevel.READ_UNCOMMITED from synchronization block and from placement
and removal from the readPoints ConcurrentHashMap.
Hotspot is removed from our profiling.
> RegionScannerImpl synchronized for READ_UNCOMMITTED Isolation Levels
> --------------------------------------------------------------------
>
> Key: HBASE-13378
> URL: https://issues.apache.org/jira/browse/HBASE-13378
> Project: HBase
> Issue Type: New Feature
> Reporter: John Leach
> Priority: Minor
> Attachments: HBASE-13378.txt
>
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> This block of code below coupled with the close method could be changed so
> that READ_UNCOMMITTED does not synchronize.
> {CODE:JAVA}
> // synchronize on scannerReadPoints so that nobody calculates
> // getSmallestReadPoint, before scannerReadPoints is updated.
> IsolationLevel isolationLevel = scan.getIsolationLevel();
> synchronized(scannerReadPoints) {
> this.readPt = getReadpoint(isolationLevel);
> scannerReadPoints.put(this, this.readPt);
> }
> {CODE}
> This hotspots for me under heavy get requests.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
