Author: stack
Date: Mon May 23 17:23:40 2011
New Revision: 1126607
URL: http://svn.apache.org/viewvc?rev=1126607&view=rev
Log:
HBASE-3911 book.xml - schema design, added comment about supported datatypes
Modified:
hbase/trunk/src/docbkx/book.xml
Modified: hbase/trunk/src/docbkx/book.xml
URL:
http://svn.apache.org/viewvc/hbase/trunk/src/docbkx/book.xml?rev=1126607&r1=1126606&r2=1126607&view=diff
==============================================================================
--- hbase/trunk/src/docbkx/book.xml (original)
+++ hbase/trunk/src/docbkx/book.xml Mon May 23 17:23:40 2011
@@ -226,6 +226,19 @@ throws InterruptedException, IOException
inserted a lot of data).
</para>
</section>
+ <section xml:id="supported.datatypes">
+ <title>
+ Supported Datatypes
+ </title>
+ <para>HBase supports a "bytes-in/bytes-out" interface via <link
xlink:href="http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/client/Put.html";>Put</link>
and
+ <link
xlink:href="http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/client/Result.html";>Result</link>,
so anything that can be
+ converted to an array of bytes can be stored as a value. Input could be
strings, numbers, complex objects, or even images as long as they can rendered
as bytes.
+ </para>
+ <para>There are practical limits to the size of values (e.g., storing
10-50MB objects in HBase would probably be too much to ask);
+ search the mailling list for conversations on this topic. All rows in HBase
conform to the <xref linkend="datamodel">datamodel</xref>, and
+ that includes versioning. Take that into consideration when making your
design, as well as block size for the ColumnFamily.
+ </para>
+ </section>
</chapter>
@@ -1551,6 +1564,16 @@ When I build, why do I always get <code>
</para>
</answer>
</qandaentry>
+ <qandaentry>
+ <question><para>
+ Store (fill in the blank) in HBase?
+ </para></question>
+ <answer>
+ <para>
+ See <xref linkend="supported.datatypes" />.
+ </para>
+ </answer>
+ </qandaentry>
</qandadiv>
</qandaset>
</appendix>
