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Pointed at oracle config. doc. for example of how other dbs have same issues we do w/ sys configs 

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1089149 13f79535-47bb-0310-9956-ffa450edef68
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Michael Stack 2011-04-05 18:12:47 +00:00
parent 66f9ba5bbc
commit dd6dca4d94
1 changed files with 10 additions and 5 deletions
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src/docbkx/getting_started.xml
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@ -329,10 +329,10 @@ stopping hbase...............</programlisting></para>
</indexterm>
</title>
<para>HBase is a database, it uses a lot of files all at the same time.
The default ulimit -n -- i.e. user file limit -- of 1024 on *nix systems
is insufficient. Any significant amount of loading will lead you to <link
xlink:href="http://wiki.apache.org/hadoop/Hbase/FAQ#A6">FAQ: Why do I
<para>HBase is a database. It uses a lot of files all at the same time.
The default ulimit -n -- i.e. user file limit -- of 1024 on most *nix systems
is insufficient (On mac os x its 256). Any significant amount of loading will
lead you to <link xlink:href="http://wiki.apache.org/hadoop/Hbase/FAQ#A6">FAQ: Why do I
see "java.io.IOException...(Too many open files)" in my logs?</link>.
You may also notice errors such as <programlisting>
2010-04-06 03:04:37,542 INFO org.apache.hadoop.hdfs.DFSClient: Exception increateBlockOutputStream java.io.EOFException
@ -343,7 +343,12 @@ stopping hbase...............</programlisting></para>
<varname>nproc</varname> setting; under load, a low-nproc
setting could manifest as <classname>OutOfMemoryError</classname>
<footnote><para>See Jack Levin's <link xlink:href="">major hdfs issues</link>
note up on the user list.</para></footnote>.
note up on the user list.</para></footnote>
<footnote><para>The requirement that a database requires upping of system limits
is not peculiar to HBase. See for example the section
<emphasis>Setting Shell Limits for the Oracle User</emphasis> in
<link xlink:href="http://www.akadia.com/services/ora_linux_install_10g.html">
Short Guide to install Oracle 10 on Linux</link>.</para></footnote>.
</para>
<para>To be clear, upping the file descriptors and nproc for the user who is