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Date: Sat, 13 Aug 2011 20:01:27 +0000 (UTC)
From: "Ted Yu (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-4197) RegionServer expects all scanner to
 be subclasses of HRegion.RegionScanner
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    [ https://issues.apache.org/jira/browse/HBASE-4197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13084705#comment-13084705 ] 

Ted Yu commented on HBASE-4197:
-------------------------------

See http://hbase.apache.org/book.html#eclipse which would tell you where to find formatter for Eclipse.

> 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
>          Components: coprocessors
>    Affects Versions: 0.92.0
>            Reporter: Lars Hofhansl
>         Attachments: 4197-bigger.txt, 4197-v2.txt, 4197.txt, ScannerTest.java
>
>
> 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(...):
> {code} 
>     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.");
>       }
> {code} 

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