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https://issues.apache.org/jira/browse/HBASE-4197?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lars Hofhansl updated HBASE-4197:
---------------------------------
Attachment: 4197-bigger.txt
Slightly larger patch that does away with all casting and instanceof "nonsense"
for scanners.
Please let me know if you generally agree with the approach, if so I'll get the
review started.
> 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-bigger.txt, 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(...):
> {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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