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HBASE-6701 Revisit thrust of paragraph on splitting (Misty Stanley-Jones)

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Michael Stack 2014-06-02 10:02:23 -07:00
parent db9cb9ca08
commit 6fdf737171
1 changed files with 8 additions and 8 deletions
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src/main/docbkx/configuration.xml
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@ -1374,14 +1374,14 @@ index e70ebc6..96f8c27 100644
<para>See <xref linkend="master.processes.loadbalancer" /> for more information on the LoadBalancer.
</para>
</section>
<section xml:id="disabling.blockcache"><title>Disabling Blockcache</title>
<para>Do not turn off block cache (You'd do it by setting <varname>hbase.block.cache.size</varname> to zero).
Currently we do not do well if you do this because the regionserver will spend all its time loading hfile
indices over and over again. In fact, in later versions of HBase, it is not possible to disable the
block cache completely.
HBase will cache meta blocks -- the INDEX and BLOOM blocks -- even if the block cache
is disabled.</para>
</section>
<section xml:id="disabling.blockcache"><title>Disabling Blockcache</title>
<para>Do not turn off block cache (You'd do it by setting <varname>hbase.block.cache.size</varname> to zero).
Currently we do not do well if you do this because the regionserver will spend all its time loading hfile
indices over and over again. If your working set it such that block cache does you no good, at least
size the block cache such that hfile indices will stay up in the cache (you can get a rough idea
on the size you need by surveying regionserver UIs; you'll see index block size accounted near the
top of the webpage).</para>
</section>
<section xml:id="nagles">
<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,