RegionServer expects all scanner to be subclasses of HRegion.RegionScanner
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Key: HBASE-4197
URL: https://issues.apache.org/jira/browse/HBASE-4197
Project: HBase
Issue Type: Bug
Affects Versions: 0.92.0
Reporter: Lars Hofhansl
Attachments: 4197.txt
Returning just an InternalScanner from RegionObsever.{pre|post}OpenScanner
leads to the following exception when using the scanner.
java.io.IOException: InternalScanner implementation is expected to be
HRegion.RegionScanner.
at
org.apache.hadoop.hbase.regionserver.HRegionServer.next(HRegionServer.java:2023)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at
org.apache.hadoop.hbase.ipc.WritableRpcEngine$Server.call(WritableRpcEngine.java:314)
at
org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1225)
The problem is in HRegionServer.next(...):
InternalScanner s = this.scanners.get(scannerName);
...
// Call coprocessor. Get region info from scanner.
HRegion region = null;
if (s instanceof HRegion.RegionScanner) {
HRegion.RegionScanner rs = (HRegion.RegionScanner) s;
region = getRegion(rs.getRegionName().getRegionName());
} else {
throw new IOException("InternalScanner implementation is expected " +
"to be HRegion.RegionScanner.");
}
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