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https://issues.apache.org/jira/browse/HBASE-4197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13085500#comment-13085500
]
Hudson commented on HBASE-4197:
-------------------------------
Integrated in HBase-TRUNK #2116 (See
[https://builds.apache.org/job/HBase-TRUNK/2116/])
HBASE-4197 TestCoprocessorInterface demonstrates CustomScanner usage
tedyu :
Files :
*
/hbase/trunk/src/test/java/org/apache/hadoop/hbase/coprocessor/TestCoprocessorInterface.java
> 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
> Assignee: Lars Hofhansl
> Attachments: 4197-bigger.txt, 4197-test.diff, 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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