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7org.apache.hadoop.metrics.spi (Hadoop 0.20.1 API)
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83Package org.apache.hadoop.metrics.spi
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85The Service Provider Interface for the Metrics API.
86<P>
87<B>See:</B>
88<BR>
89&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<A HREF="#package_description"><B>Description</B></A>
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98<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/AbstractMetricsContext.html" title="class in org.apache.hadoop.metrics.spi">AbstractMetricsContext</A></B></TD>
99<TD>The main class of the Service Provider Interface.</TD>
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102<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/CompositeContext.html" title="class in org.apache.hadoop.metrics.spi">CompositeContext</A></B></TD>
103<TD>&nbsp;</TD>
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106<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/MetricsRecordImpl.html" title="class in org.apache.hadoop.metrics.spi">MetricsRecordImpl</A></B></TD>
107<TD>An implementation of MetricsRecord.</TD>
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110<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/MetricValue.html" title="class in org.apache.hadoop.metrics.spi">MetricValue</A></B></TD>
111<TD>A Number that is either an absolute or an incremental amount.</TD>
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114<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/NullContext.html" title="class in org.apache.hadoop.metrics.spi">NullContext</A></B></TD>
115<TD>Null metrics context: a metrics context which does nothing.</TD>
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118<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/NullContextWithUpdateThread.html" title="class in org.apache.hadoop.metrics.spi">NullContextWithUpdateThread</A></B></TD>
119<TD>A null context which has a thread calling
120 periodically when monitoring is started.</TD>
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123<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/OutputRecord.html" title="class in org.apache.hadoop.metrics.spi">OutputRecord</A></B></TD>
124<TD>Represents a record of metric data to be sent to a metrics system.</TD>
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127<TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/metrics/spi/Util.html" title="class in org.apache.hadoop.metrics.spi">Util</A></B></TD>
128<TD>Static utility methods</TD>
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132
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135Package org.apache.hadoop.metrics.spi Description
136</H2>
137
138<P>
139The Service Provider Interface for the Metrics API.  This package provides
140an interface allowing a variety of metrics reporting implementations to be
141plugged in to the Metrics API.  Examples of such implementations can be found
142in the packages <code>org.apache.hadoop.metrics.file</code> and
143<code>org.apache.hadoop.metrics.ganglia</code>.<p/>
144
145Plugging in an implementation involves writing a concrete subclass of
146<code>AbstractMetricsContext</code>.  The subclass should get its
147 configuration information using the <code>getAttribute(<i>attributeName</i>)</code>
148 method.
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