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From "Jim Kellerman (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1045) Code for HBase
Date Tue, 13 Mar 2007 06:10:09 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12480283
] 

Jim Kellerman commented on HADOOP-1045:
---------------------------------------

TODO: the current HBase scanner interface allows you to scan through multiple rows for an
explicit set of column family members (e.g., contents:firstcolumn and anchor:secondcolumn),
but it doesn't let you iterate over all the members of a column family for a particular row
unless you explicitly enumerate them. This is a problem as you may not know apriori the names
of all the family members.

The Bigtable paper states that "For example, we could restrict the scan above to only produce
anchors whose columns match the regular expression anchor:*.cnn.com" (ignore for the moment
that if "anchor:*.cnn.com" were applied as a regular expression, :* means zero or more ':'s
and that the '.' between the '*' and 'cnn' and between 'cnn' and 'com' match any character).
You should be able to say 'anchor:' which means every member of the anchor family or 'anchor:anchornum-[0-9]+'
which would match every anchor family member that starts with 'anchornum-' and then has one
or more digits that follow it.

This was uncovered in unit testing using the tests that were commented out in HRegion.java

> Code for HBase
> --------------
>
>                 Key: HADOOP-1045
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1045
>             Project: Hadoop
>          Issue Type: New Feature
>         Environment: All environments
>            Reporter: Mike Cafarella
>         Assigned To: Jim Kellerman
>         Attachments: hbase.patch, hbase.patch, hbase.patch, hbase.patch, hbase.tar.gz
>
>
> I've written some code for HBase, a BigTable-like file store.  It's not perfect, but
it's ready for other people to play with and examine.
> The attached tarball has the source and a README

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