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From st...@apache.org
Subject svn commit: r1462296 - /hbase/trunk/src/docbkx/ops_mgt.xml
Date Thu, 28 Mar 2013 20:41:09 GMT
Author: stack
Date: Thu Mar 28 20:41:09 2013
New Revision: 1462296

URL: http://svn.apache.org/r1462296
Log:
Add note on running mlockall on startup to pin servers in physical mem

Modified:
    hbase/trunk/src/docbkx/ops_mgt.xml

Modified: hbase/trunk/src/docbkx/ops_mgt.xml
URL: http://svn.apache.org/viewvc/hbase/trunk/src/docbkx/ops_mgt.xml?rev=1462296&r1=1462295&r2=1462296&view=diff
==============================================================================
--- hbase/trunk/src/docbkx/ops_mgt.xml (original)
+++ hbase/trunk/src/docbkx/ops_mgt.xml Thu Mar 28 20:41:09 2013
@@ -306,6 +306,15 @@ row10	c1	c2
        <para>Note: just like RowCounter, caching for the input Scan is configured via
<code>hbase.client.scanner.caching</code> in the
        job configuration. </para>
     </section>
+    <section xml:id="mlockall">
+        <title>mlockall</title>
+        <para>It is possible to optionally pin your servers in physical memory making
them less likely
+            to be swapped out in oversubscribed environments by having the servers call
+            <link xlink:href="http://linux.die.net/man/2/mlockall">mlockall</link>
on startup.
+            See <link xlink:href="https://issues.apache.org/jira/browse/HBASE-4391">HBASE-4391
Add ability to start RS as root and call mlockall</link>
+            for how to build the optional library and have it run on startup.
+        </para>
+    </section>
 
     </section>  <!--  tools -->
 



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