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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-82) row keys should be array of bytes with a specified comparator
Date Fri, 02 May 2008 06:18:56 GMT

     [ https://issues.apache.org/jira/browse/HBASE-82?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack updated HBASE-82:
-----------------------

    Attachment: 82-v4.patch

Fixed up tests.  Now working on gettting it all to compile.

> row keys should be array of bytes with a specified comparator
> -------------------------------------------------------------
>
>                 Key: HBASE-82
>                 URL: https://issues.apache.org/jira/browse/HBASE-82
>             Project: Hadoop HBase
>          Issue Type: Wish
>            Reporter: Jim Kellerman
>            Assignee: stack
>             Fix For: 0.2.0
>
>         Attachments: 82-v2.patch, 82-v3.patch, 82-v4.patch, 82.patch
>
>
> I have heard from several people that row keys in HBase should be less restricted than
hadoop.io.Text.
> What do you think?
> At the very least, a row key has to be a WritableComparable. This would lead to the most
general case being either hadoop.io.BytesWritable or hbase.io.ImmutableBytesWritable. The
primary difference between these two classes is that hadoop.io.BytesWritable by default allocates
100 bytes and if you do not pay attention to the length, (BytesWritable.getSize()), converting
a String to a BytesWritable and vice versa can become problematic. 
> hbase.io.ImmutableBytesWritable, in contrast only allocates as many bytes as you pass
in and then does not allow the size to be changed.
> If we were to change from Text to a non-text key, my preference would be for ImmutableBytesWritable,
because it has a fixed size once set, and operations like get, etc do not have to something
like System.arrayCopy where you specify the number of bytes to copy.
> Your comments, questions are welcome on this issue. If we receive enough feedback that
Text is too restrictive, we are willing to change it, but we need to hear what would be the
most useful thing to change it to as well.

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