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https://issues.apache.org/jira/browse/HBASE-5097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13238121#comment-13238121
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ramkrishna.s.vasudevan commented on HBASE-5097:
-----------------------------------------------
This patch is not committed yet.!!
I will do that today..
> 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
> 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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