Add generated metrics
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Michael Stack
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<h1>
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HBase Metrics
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<h2 class="h3"> Introduction </h2>
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<div class="section">
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<p>
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HBase emits Hadoop <a href="http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/metrics/package-summary.html">metrics</a>.
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</p>
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<h2 class="h3">HOWTO</h2>
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<div class="section">
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<p>First read up on Hadoop <a href="http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/metrics/package-summary.html">metrics</a>.
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If you are using ganglia, the <a href="http://wiki.apache.org/hadoop/GangliaMetrics">GangliaMetrics</a>
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wiki page is useful read.</p>
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<p>To have HBase emit metrics, edit <span class="codefrag">$HBASE_HOME/conf/hadoop-metrics.properties</span>
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and enable metric 'contexts' per plugin. As of this writing, hadoop supports
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<strong>file</strong> and <strong>ganglia</strong> plugins.
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Yes, the hbase metrics files is named hadoop-metrics rather than
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<em>hbase-metrics</em> because currently at least the hadoop metrics system has the
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properties filename hardcoded. Per metrics <em>context</em>,
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comment out the NullContext and enable one or more plugins instead.
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</p>
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<p>
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If you enable the <em>hbase</em> context, on regionservers you'll see total requests since last
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metric emission, count of regions and storefiles as well as a count of memcache size.
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On the master, you'll see a count of the cluster's requests.
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</p>
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<p>
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Enabling the <em>rpc</em> context is good if you are interested in seeing
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metrics on each hbase rpc method invocation (counts and time taken).
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</p>
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<p>
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The <em>jvm</em> context is
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useful for long-term stats on running hbase jvms -- memory used, thread counts, etc.
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As of this writing, if more than one jvm is running emitting metrics, at least
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in ganglia, the stats are aggregated rather than reported per instance.
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</p>
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Copyright ©
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2008 <a href="http://www.apache.org/licenses/">The Apache Software Foundation.</a>
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/BaseFont /Helvetica
|
||||
/Encoding /WinAnsiEncoding >>
|
||||
endobj
|
||||
25 0 obj
|
||||
<< /Type /Font
|
||||
/Subtype /Type1
|
||||
/Name /F9
|
||||
/BaseFont /Courier
|
||||
/Encoding /WinAnsiEncoding >>
|
||||
endobj
|
||||
26 0 obj
|
||||
<< /Type /Font
|
||||
/Subtype /Type1
|
||||
/Name /F2
|
||||
/BaseFont /Helvetica-Oblique
|
||||
/Encoding /WinAnsiEncoding >>
|
||||
endobj
|
||||
27 0 obj
|
||||
<< /Type /Font
|
||||
/Subtype /Type1
|
||||
/Name /F7
|
||||
/BaseFont /Times-Bold
|
||||
/Encoding /WinAnsiEncoding >>
|
||||
endobj
|
||||
1 0 obj
|
||||
<< /Type /Pages
|
||||
/Count 2
|
||||
/Kids [6 0 R 13 0 R ] >>
|
||||
endobj
|
||||
2 0 obj
|
||||
<< /Type /Catalog
|
||||
/Pages 1 0 R
|
||||
/Outlines 18 0 R
|
||||
/PageMode /UseOutlines
|
||||
>>
|
||||
endobj
|
||||
3 0 obj
|
||||
<<
|
||||
/Font << /F3 21 0 R /F5 22 0 R /F1 24 0 R /F6 23 0 R /F9 25 0 R /F2 26 0 R /F7 27 0 R >>
|
||||
/ProcSet [ /PDF /ImageC /Text ] >>
|
||||
endobj
|
||||
9 0 obj
|
||||
<<
|
||||
/S /GoTo
|
||||
/D [13 0 R /XYZ 85.0 659.0 null]
|
||||
>>
|
||||
endobj
|
||||
11 0 obj
|
||||
<<
|
||||
/S /GoTo
|
||||
/D [13 0 R /XYZ 85.0 606.666 null]
|
||||
>>
|
||||
endobj
|
||||
18 0 obj
|
||||
<<
|
||||
/First 19 0 R
|
||||
/Last 20 0 R
|
||||
>> endobj
|
||||
xref
|
||||
0 28
|
||||
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|
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||||
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||||
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|
||||
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|
||||
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|
||||
0000004599 00000 n
|
||||
trailer
|
||||
<<
|
||||
/Size 28
|
||||
/Root 2 0 R
|
||||
/Info 4 0 R
|
||||
>>
|
||||
startxref
|
||||
5190
|
||||
%%EOF
|
||||
Loading…
Reference in New Issue