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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7221) RowKey utility class for rowkey construction
Date Tue, 26 Feb 2013 00:26:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13586516#comment-13586516
] 

Lars Hofhansl commented on HBASE-7221:
--------------------------------------

Fair enough.
How does that relate to Nick's work on HBASE-7692? Do you see these as complimentary?

We had way too much discussion for a feature like, and I apologize. Just seems important to
get this right. Having some kind of standard key-building facility is essential for HBase
(IMHO), and will lay the foundation for features layered on top of HBase (such as 2ndary indexes,
etc).

                
> RowKey utility class for rowkey construction
> --------------------------------------------
>
>                 Key: HBASE-7221
>                 URL: https://issues.apache.org/jira/browse/HBASE-7221
>             Project: HBase
>          Issue Type: Improvement
>          Components: util
>            Reporter: Doug Meil
>            Assignee: Doug Meil
>            Priority: Minor
>         Attachments: HBASE_7221.patch, hbase-common_hbase_7221_2.patch, hbase-common_hbase_7221_v3.patch,
hbase-common_hbase_7221_v4.patch, hbase-server_hbase_7221_v5.patch, hbase-server_hbase_7221_v6.patch
>
>
> A common question in the dist-lists is how to construct rowkeys, particularly composite
keys.  Put/Get/Scan specifies byte[] as the rowkey, but it's up to you to sensibly populate
that byte-array, and that's where things tend to go off the rails.
> The intent of this RowKey utility class isn't meant to add functionality into Put/Get/Scan,
but rather make it simpler for folks to construct said arrays.  Example:
> {code}
>    RowKey key = RowKey.create(RowKey.SIZEOF_MD5_HASH + RowKey.SIZEOF_LONG);
>    key.addHash(a);
>    key.add(b);
>    byte bytes[] = key.getBytes();
> {code} 

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