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HBASE-4456 [doc] Add a section about RS failover (Misty Stanley-Jones)

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Michael Stack 2014-05-28 23:10:21 -07:00
parent 9fc9c0f210
commit 2db8aafe7d
1 changed files with 20 additions and 8 deletions
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src/main/docbkx/book.xml
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@ -2193,17 +2193,29 @@ rs.close();
</para>
</section>
<section xml:id="regions.arch.assignment.failover">
<section
xml:id="regions.arch.assignment.failover">
<title>Failover</title>
<para>When a RegionServer fails (short version):
<orderedlist>
<listitem><para>The regions immediately become unavailable because the RegionServer is down.</para>
<para>When a RegionServer fails: <orderedlist>
<listitem>
<para>The regions immediately become unavailable because the RegionServer is
down.</para>
</listitem>
<listitem><para>The Master will detect that the RegionServer has failed.</para>
<listitem>
<para>The Master will detect that the RegionServer has failed.</para>
</listitem>
<listitem><para>The region assignments will be considered invalid and will be re-assigned just
<listitem>
<para>The region assignments will be considered invalid and will be re-assigned just
like the startup sequence.</para>
</listitem>
<listitem>
<para>In-flight queries are re-tried, and not lost.</para>
</listitem>
<listitem>
<para>Operations are switched to a new RegionServer within the following amount of
time:</para>
<programlisting>ZooKeeper session timeout + split time + assignment/replay time</programlisting>
</listitem>
</orderedlist>
</para>
</section>