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From "Andreas Neumann (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 18:07:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14135852#comment-14135852
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Andreas Neumann commented on HBASE-11990:
-----------------------------------------

Actually, for something like { 0x12, 0x23, 0xFF, 0xFF }, the correct stop key is not { 0x12,
0x24, 0x00, 0x00 } but { 0x12, 0x24 }. If you use { 0x12, 0x24, 0x00, 0x00 }, then that would
include { 0x12, 0x24, 0x00 } and { 0x12, 0x24 }, both obviously do not have the prefix in
question. 

> 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.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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