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HBASE-11986 Document MOB in Reference Guide

This commit is contained in:
Misty Stanley-Jones 2014-09-18 15:27:05 +10:00
parent d147eced57
commit 7cd71d1db6
3 changed files with 13 additions and 1 deletions
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2
src/main/docbkx/book.xml
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@ -4658,8 +4658,10 @@ if (result.isStale()) {
</section>
</chapter> <!-- architecture -->
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="hbase_apis.xml"/>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="external_apis.xml"/>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="hbase_mob.xml"/>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="thrift_filter_language.xml"/>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="cp.xml" />
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="performance.xml"/>

3
src/main/docbkx/ops_mgt.xml
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@ -2119,7 +2119,8 @@ hbase> restore_snapshot 'myTableSnapshot-122112'
<para>If you cannot estimate the size of your tables well, when starting off, it's probably
best to stick to the default region size, perhaps going smaller for hot tables (or
manually split hot regions to spread the load over the cluster), or go with larger region
sizes if your cell sizes tend to be largish (100k and up).</para>
sizes if your cell sizes tend to be largish (100k and up). See also the new feature <xref
linkend="mob"/>, introduced in HBase 2.0+.</para>
<para>In HBase 0.98, experimental stripe compactions feature was added that would allow for
larger regions, especially for log data. See <xref
linkend="ops.stripe" />.</para>

9
src/main/docbkx/schema_design.xml
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@ -464,6 +464,15 @@ public static byte[][] getHexSplits(String startKey, String endKey, int numRegio
less than the number of row versions. </para>
</section>
</section>
<section>
<title>Cell Size</title>
<para>HBase is optimized to handle cell sizes up to 100 KB very well, though it can technically
handle cell sizes from 1 kb to 10 MB. Objects between 1 MB and 64 MB are referred to as
Medium Objects (MOBs), and support for storing those objects directly in HBase is provided in
HBase 2.0+. See <xref linkend="mob"/>.</para>
<para>For storing objects larger than 64 MB or larger than 10 MB without MOB support, store the
objects directly in HDFS, and store a reference to the file path in HBase.</para>
</section>
<section
xml:id="supported.datatypes">
<title> Supported Datatypes </title>