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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-4197) RegionServer expects all scanner to be subclasses of HRegion.RegionScanner
Date Fri, 12 Aug 2011 17:28:28 GMT
RegionServer expects all scanner to be subclasses of HRegion.RegionScanner

                 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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