You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@hbase.apache.org by "ramkrishna.s.vasudevan (Assigned) (JIRA)" <ji...@apache.org> on 2011/12/29 02:19:32 UTC
[jira] [Assigned] (HBASE-5097) RegionObserver implementation whose
preScannerOpen and postScannerOpen Impl return null can stall the system
initialization through NPE
[ https://issues.apache.org/jira/browse/HBASE-5097?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
ramkrishna.s.vasudevan reassigned HBASE-5097:
---------------------------------------------
Assignee: ramkrishna.s.vasudevan
> 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
>
> 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.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira