Author: dmeil
Date: Fri Feb 10 18:27:42 2012
New Revision: 1242878
URL: http://svn.apache.org/viewvc?rev=1242878&view=rev
Log:
hbase-5380. book.xml, comment about KeyValue instances not being split across
blocks
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=1242878&r1=1242877&r2=1242878&view=diff
==============================================================================
--- hbase/trunk/src/docbkx/book.xml (original)
+++ hbase/trunk/src/docbkx/book.xml Fri Feb 10 18:27:42 2012
@@ -2082,7 +2082,7 @@ myHtd.setValue(HTableDescriptor.SPLIT_PO
<section xml:id="keyvalue">
<title>KeyValue</title>
<para>The KeyValue class is the heart of data storage in HBase.
KeyValue wraps a byte array and takes offsets and lengths into passed array
- at where to start interpreting the content as KeyValue.
+ at where to start interpreting the content as KeyValue.
</para>
<para>The KeyValue format inside a byte array is:
<itemizedlist>
@@ -2103,7 +2103,9 @@ myHtd.setValue(HTableDescriptor.SPLIT_PO
<listitem>keytype (e.g., Put, Delete, DeleteColumn,
DeleteFamily)</listitem>
</itemizedlist>
</para>
- <para>For more information, see the <link
xlink:href="http://hbase.apache.org/xref/org/apache/hadoop/hbase/KeyValue.html";>KeyValue
source code</link>.
+ <para>KeyValue instances are <emphasis>not</emphasis> split across
blocks.
+ For example, if there is an 8 MB KeyValue, even if the block-size is
64kb this KeyValue will be read
+ in as a coherent block. For more information, see the <link
xlink:href="http://hbase.apache.org/xref/org/apache/hadoop/hbase/KeyValue.html";>KeyValue
source code</link>.
</para>
<section xml:id="keyvalue.example"><title>Example</title>
<para>To emphasize the points above, examine what happens with two
Puts for two different columns for the same row:</para>
