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https://issues.apache.org/jira/browse/HBASE-7221?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Doug Meil updated HBASE-7221:
-----------------------------
Attachment: hbase-common_hbase_7221_v3.patch
Ok, I think this one's a winner. :-)
There is a RowKeySchema and a RowKey. This creates fixed-length keys without
delimiters (generally considered to be a best practice), and enforces the
defined lengths when the elements are set. It's also bi-directional, so that
you can pass in a byte-array (i.e., rowkey) from a table and then read the key
elements back.
Creation example...
{code}
int elements[] = {RowKeySchema.SIZEOF_MD5_HASH, RowKeySchema.SIZEOF_INT,
RowKeySchema.SIZEOF_LONG};
RowKeySchema schema = new RowKeySchema(elements);
RowKey rowkey = schema.createRowKey();
rowkey.setHash(0, hashVal);
rowkey.setInt(1, intVal);
rowkey.setLong(2, longVal);
byte bytes[] = rowkey.getBytes();
{code}
> RowKey utility class for rowkey construction
> --------------------------------------------
>
> Key: HBASE-7221
> URL: https://issues.apache.org/jira/browse/HBASE-7221
> Project: HBase
> Issue Type: Improvement
> Reporter: Doug Meil
> Assignee: Doug Meil
> Priority: Minor
> Attachments: HBASE_7221.patch, hbase-common_hbase_7221_2.patch,
> hbase-common_hbase_7221_v3.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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