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