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Posted to issues@hbase.apache.org by "John Leach (JIRA)" <ji...@apache.org> on 2015/04/01 20:38:55 UTC
[jira] [Work started] (HBASE-13378) RegionScannerImpl synchronized
for READ_UNCOMMITTED Isolation Levels
[ https://issues.apache.org/jira/browse/HBASE-13378?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Work on HBASE-13378 started by John Leach.
------------------------------------------
> 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
> Assignee: 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.
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