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From "Lars Hofhansl (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HBASE-5097) RegionObserver implementation whose preScannerOpen and postScannerOpen Impl return null can stall the system initialization through NPE
Date Tue, 03 Apr 2012 04:02:37 GMT

     [ https://issues.apache.org/jira/browse/HBASE-5097?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lars Hofhansl resolved HBASE-5097.
----------------------------------

    Resolution: Fixed

To answer my own question: Yes :)
                
> RegionObserver implementation whose preScannerOpen and postScannerOpen Impl return null
can stall the system initialization through NPE
> ---------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-5097
>                 URL: https://issues.apache.org/jira/browse/HBASE-5097
>             Project: HBase
>          Issue Type: Bug
>          Components: coprocessors
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>             Fix For: 0.92.2, 0.94.0, 0.96.0
>
>         Attachments: HBASE-5097.patch, HBASE-5097_1.patch, HBASE-5097_2.patch
>
>
> 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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