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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-4197) RegionServer expects all scanner to be subclasses of HRegion.RegionScanner
Date Fri, 12 Aug 2011 17:48:27 GMT

     [ https://issues.apache.org/jira/browse/HBASE-4197?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

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(...):
{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}

  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(...):
    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.");
      }




> 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(...):
> {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}

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