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Posted to issues@hbase.apache.org by "Mingjie Lai (JIRA)" <ji...@apache.org> on 2011/03/24 00:29:05 UTC
[jira] [Updated] (HBASE-3583) Coprocessors: RegionObserver:
ScannerNext and ScannerClose hooks are called when get() is invoked
[ https://issues.apache.org/jira/browse/HBASE-3583?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mingjie Lai updated HBASE-3583:
-------------------------------
Attachment: HBase3583-3.patch
The 3rd patch to rb. Also cc here.
> Coprocessors: RegionObserver: ScannerNext and ScannerClose hooks are called when get() is invoked
> -------------------------------------------------------------------------------------------------
>
> Key: HBASE-3583
> URL: https://issues.apache.org/jira/browse/HBASE-3583
> Project: HBase
> Issue Type: Bug
> Components: coprocessors
> Affects Versions: 0.92.0
> Reporter: Mingjie Lai
> Assignee: Mingjie Lai
> Fix For: 0.92.0
>
> Attachments: HBase3583-3.patch, HBase3583.patch
>
>
> RegionObserver upcalls are expected to be triggered by corresponding client calls.
> I found that if a HTable.get() is issued, ScannerNext, and ScannerClose hooks are also invoked.
> Here is the reason: HRegion.get() is implemented with an internal scanner:
> {code}
> InternalScanner scanner = null;
> try {
> scanner = getScanner(scan);
> scanner.next(results);
> } finally {
> if (scanner != null)
> scanner.close();
> }
> {code}
> where scanner.next, and scanner.close() are implemented with RegionObserver hooks.
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