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Add section on mttr; cite nicolas/devaraj blog and point at hbase-8389 varun comments 

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1486358 13f79535-47bb-0310-9956-ffa450edef68
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Michael Stack 2013-05-25 20:30:43 +00:00
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@ -1172,6 +1172,14 @@ of all regions.
see the graphs on the tail of <link xlink:href="https://issues.apache.org/jira/browse/HBASE-7008">HBASE-7008 Set scanner caching to a better default</link>
where our Lars Hofhansl tries various data sizes w/ Nagle's on and off measuring the effect.</para>
</section>
<section xml:id="mttr">
<title>Better Mean Time to Recover (MTTR)</title>
<para>See the Deveraj Das an Nicolas Liochon blog post
<link xlink:href="http://hortonworks.com/blog/introduction-to-hbase-mean-time-to-recover-mttr/">Introduction to HBase Mean Time to Recover (MTTR)</link>
for a brief introduction. The issue <link xlink:href="https://issues.apache.org/jira/browse/HBASE-8389">HBASE-8354 forces Namenode into loop with lease recovery requests</link>
is messy but has a bunch of good discussion toward the end on low timeouts and how to effect faster recovery including citation of fixes
added to HDFS. Read the Varun Sharma comments.</para>
</section>
</section>