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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