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From "Jean-Marc Spaggiari (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11990) Make setting the start and stop row for a specific prefix easier
Date Tue, 16 Sep 2014 20:37:35 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14136153#comment-14136153
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Jean-Marc Spaggiari commented on HBASE-11990:
---------------------------------------------

Nice, Thanks for the updates.

{code}
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.NavigableSet;
-import java.util.TreeMap;
-import java.util.TreeSet;
+import java.util.*;
 {code}
I think we prefer to list the imports instead of using the wildcard. 

LGTM.

+1 is tests pass.

> Make setting the start and stop row for a specific prefix easier
> ----------------------------------------------------------------
>
>                 Key: HBASE-11990
>                 URL: https://issues.apache.org/jira/browse/HBASE-11990
>             Project: HBase
>          Issue Type: New Feature
>          Components: Client
>            Reporter: Niels Basjes
>         Attachments: HBASE-11990-20140916-v2.patch, HBASE-11990-20140916.patch
>
>
> If you want to set a scan from your application to scan for a specific row prefix this
is actually quite hard.
> As described in several places you can set the startRow to the prefix; yet the stopRow
should be set to the prefix '+1'
> If the prefix 'ASCII' put into a byte[] then this is easy because you can simply increment
the last byte of the array. 
> But if your application uses real binary rowids you may run into the scenario that your
prefix is something like 
> {code}{ 0x12, 0x23, 0xFF, 0xFF }{code} Then the increment should be {code}{ 0x12, 0x24,
0x00, 0x00 }{code}
> I have prepared a proposed patch that makes setting these values correctly a lot easier.



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