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HBASE-11909 Documented how to find the current number of 

regions and why the numbers in the UI might not agree with hbck output
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Misty Stanley-Jones 2014-09-10 06:54:59 +10:00
parent f7bcf3df6b
commit f5fde94035
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src/main/docbkx/ops_mgt.xml
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@ -2062,6 +2062,17 @@ hbase> restore_snapshot 'myTableSnapshot-122112'
xrefstyle="template:above" /> should be.</emphasis> So, if your data is compressed and xrefstyle="template:above" /> should be.</emphasis> So, if your data is compressed and
replicated 3 ways by HDFS, "9 Gb region" means 9 Gb of compressed data. HDFS replication replicated 3 ways by HDFS, "9 Gb region" means 9 Gb of compressed data. HDFS replication
factor only affects your disk usage and is invisible to most HBase code.</para> factor only affects your disk usage and is invisible to most HBase code.</para>
<section>
<title>Viewing the Current Number of Regions</title>
<para>You can view the current number of regions for a given table using the HMaster UI. In
the <guilabel>Tables</guilabel> section, the number of online regions for each table is
listed in the <guilabel>Online Regions</guilabel> column. This total only includes the
in-memory state and does not include disabled or offline regions. If you do not want to
use the HMaster UI, you can determine the number of regions by counting the number of
subdirectories of the /hbase/&lt;table&gt;/ subdirectories in HDFS, or by running the
<command>bin/hbase hbck</command> command. Each of these methods may return a slightly
different number, depending on the status of each region.</para>
</section>
<section <section
xml:id="ops.capacity.regions.count"> xml:id="ops.capacity.regions.count">
<title>Number of regions per RS - upper bound</title> <title>Number of regions per RS - upper bound</title>