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Lars Hofhansl updated HBASE-4197: --------------------------------- Description: 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."); } }} was: 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(...): {quote} 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."); } {quote} > 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."); > } > }} -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira