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hbase-5406 book.xml - adding section to Data Model chapter about column metadata. 

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1244676 13f79535-47bb-0310-9956-ffa450edef68
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Doug Meil 2012-02-15 19:46:06 +00:00
parent 87d4ad6980
commit db6992f96c
1 changed files with 12 additions and 0 deletions
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12
src/docbkx/book.xml
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@ -175,6 +175,8 @@
<literal>t6</literal>, the value of <varname>anchor:cnnsi.com</varname>
from time stamp <literal>t9</literal>, the value of
<varname>anchor:my.look.ca</varname> from time stamp <literal>t8</literal>.
</para>
<para>For more information about the internals of how HBase stores data, see <xref linkend="regions.arch" />.
</para>
</section>
@ -288,6 +290,16 @@ try {
</para>
</section>
<section xml:id="dm.column.metadata">
<title>Column Metadata</title>
<para>There is no store of column metadata outside of the internal KeyValue instances for a ColumnFamily.
Thus, while HBase can support not only a wide number of columns per row, but a heterogenous set of columns
between rows, it is your responsibility to keep track of the column names.
</para>
<para>The only way to get a complete set of columns that exist for a ColumnFamily is to process all the rows.
For more information about how HBase stores data internally, see <xref linkend="keyvalue" />.
</para>
</section>
</section>