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Add note that can OOME if many regions and MSLAB on 

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1406306 13f79535-47bb-0310-9956-ffa450edef68
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Michael Stack 2012-11-06 20:20:16 +00:00
parent 9b3e63dcb7
commit 1ed61755ad
1 changed files with 66 additions and 59 deletions
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9
src/docbkx/performance.xml
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@ -128,7 +128,14 @@
slides for background and detail<footnote><para>The latest jvms do better
regards fragmentation so make sure you are running a recent release.
Read down in the message,
<link xlink:href="http://osdir.com/ml/hotspot-gc-use/2011-11/msg00002.html">Identifying concurrent mode failures caused by fragmentation</link>.</para></footnote>.</para>
<link xlink:href="http://osdir.com/ml/hotspot-gc-use/2011-11/msg00002.html">Identifying concurrent mode failures caused by fragmentation</link>.</para></footnote>.
Be aware that when enabled, each MemStore instance will occupy at least
an MSLAB instance of memory. If you have thousands of regions or lots
of regions each with many column families, this allocation of MSLAB
may be responsible for a good portion of your heap allocation and in
an extreme case cause you to OOME. Disable MSLAB in this case, or
lower the amount of memory it uses or float less regions per server.
</para>
<para>For more information about GC logs, see <xref linkend="trouble.log.gc" />.
</para>
</section>