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From "ramkrishna.s.vasudevan (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5097) Coprocessor RegionObserver implementation without preScannerOpen and postScannerOpen Impl is throwing NPE and so failing the system initialization.
Date Tue, 27 Dec 2011 06:42:30 GMT
Coprocessor RegionObserver implementation without preScannerOpen and postScannerOpen Impl is
throwing NPE and so failing the system initialization.
---------------------------------------------------------------------------------------------------------------------------------------------------

                 Key: HBASE-5097
                 URL: https://issues.apache.org/jira/browse/HBASE-5097
             Project: HBase
          Issue Type: Bug
            Reporter: ramkrishna.s.vasudevan
            Priority: Blocker


In HRegionServer.java openScanner()
{code}
      r.prepareScanner(scan);
      RegionScanner s = null;
      if (r.getCoprocessorHost() != null) {
        s = r.getCoprocessorHost().preScannerOpen(scan);
      }
      if (s == null) {
        s = r.getScanner(scan);
      }
      if (r.getCoprocessorHost() != null) {
        s = r.getCoprocessorHost().postScannerOpen(scan, s);
      }
{code}
If we dont have implemention for postScannerOpen the RegionScanner is null and so throwing
nullpointer 
{code}
java.lang.NullPointerException
	at java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:881)
	at org.apache.hadoop.hbase.regionserver.HRegionServer.addScanner(HRegionServer.java:2282)
	at org.apache.hadoop.hbase.regionserver.HRegionServer.openScanner(HRegionServer.java:2272)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.hadoop.hbase.ipc.WritableRpcEngine$Server.call(WritableRpcEngine.java:364)
	at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1326)

{code}

Making this defect as blocker.. Pls feel free to change the priority if am wrong.  Also correct
me if my way of trying out coprocessors without implementing postScannerOpen is wrong.  Am
just a learner.


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