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From "Mingjie Lai (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-3583) Coprocessors: RegionObserver: ScannerNext and ScannerClose hooks are called when get() is invoked
Date Mon, 28 Feb 2011 23:25:37 GMT
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: 0.90.2
            Reporter: Mingjie Lai
            Assignee: Mingjie Lai
             Fix For: 0.90.2


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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