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Posted to commits@hbase.apache.org by st...@apache.org on 2012/08/31 00:22:32 UTC
svn commit: r1379189 - /hbase/trunk/src/docbkx/performance.xml
Author: stack
Date: Thu Aug 30 22:22:32 2012
New Revision: 1379189
URL: http://svn.apache.org/viewvc?rev=1379189&view=rev
Log:
Add note on nagles to perf section
Modified:
hbase/trunk/src/docbkx/performance.xml
Modified: hbase/trunk/src/docbkx/performance.xml
URL: http://svn.apache.org/viewvc/hbase/trunk/src/docbkx/performance.xml?rev=1379189&r1=1379188&r2=1379189&view=diff
==============================================================================
--- hbase/trunk/src/docbkx/performance.xml (original)
+++ hbase/trunk/src/docbkx/performance.xml Thu Aug 30 22:22:32 2012
@@ -139,6 +139,13 @@
<title>HBase Configurations</title>
<para>See <xref linkend="recommended_configurations" />.</para>
+ <section xml:id="perf.nagels">
+ <title><link xlink:href="http://en.wikipedia.org/wiki/Nagle's_algorithm">Nagle's</link> or the small package problem</title>
+ <para>If a big 40ms or so occasional delay is seen in operations against HBase,
+ try the Nagles' setting. For example, see the user mailing list thread,
+ <link xlink:href="http://search-hadoop.com/m/pduLg2fydtE/Inconsistent+scan+performance+with+caching+set+&subj=Re+Inconsistent+scan+performance+with+caching+set+to+1">Inconsistent scan performance with caching set to 1</link>
+ and the issue cited therein where setting notcpdelay improved scan speeds.</para>
+ </section>
<section xml:id="perf.number.of.regions">
<title>Number of Regions</title>