[jira] [Work started] (HBASE-15274) ClientSideRegionScanner's reaction to Scan#setBatch is not consistent between HBase versions

["Youngjoon Kim (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-15274?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HBASE-15274 started by Youngjoon Kim.
---------------------------------------------
> ClientSideRegionScanner's reaction to Scan#setBatch is not consistent between HBase versions
> --------------------------------------------------------------------------------------------
>
>                 Key: HBASE-15274
>                 URL: https://issues.apache.org/jira/browse/HBASE-15274
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 1.0.3, 1.1.3, 0.98.17
>            Reporter: Youngjoon Kim
>            Assignee: Youngjoon Kim
>            Priority: Minor
>
> In 1.1.3, ClientSideRegionScanner calls RegionScannerImpl#next() with single argument, so it honors Scan#setBatch(through defaultScannerContext in RegionScannerImpl).
> {code}
> // 1.1.3
> public class ClientSideRegionScanner extends AbstractClientScanner {
>   ...
>   @Override
>   public Result next() throws IOException {
>     values.clear();
>     scanner.nextRaw(values);
>     ...
> {code}
>  
> \\
> But in 1.0.3 and 0.98.17, ClientSideRegionScanner calls RegionScannerImpl#next() with limit=-1, so it ignores Scan#setBatch.
> {code}
> // 1.0.3 and 0.98.17
> public class ClientSideRegionScanner extends AbstractClientScanner {
>   ...
>   @Override
>   public Result next() throws IOException {
>     values.clear();
>     scanner.nextRaw(values, -1); // pass -1 as limit so that we see the whole row.
>     ...
> {code}



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