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<div class="subTitle">org.apache.hadoop.hbase.client.coprocessor</div>
<h2 title="Class AggregationClient" class="title">Class AggregationClient</h2>
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<li>org.apache.hadoop.hbase.client.coprocessor.AggregationClient</li>
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<pre>@InterfaceAudience.Public
public class <a href="../../../../../../src-html/org/apache/hadoop/hbase/client/coprocessor/AggregationClient.html#line.82">AggregationClient</a>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>
implements <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a></pre>
<div class="block">This client class is for invoking the aggregate functions deployed on the
Region Server side via the AggregateService. This class will implement the
supporting functionality for summing/processing the individual results
obtained from the AggregateService for each region.
<p>
This will serve as the client side handler for invoking the aggregate
functions.
For all aggregate functions,
<ul>
<li>start row &lt; end row is an essential condition (if they are not
<a href="../../../../../../org/apache/hadoop/hbase/HConstants.html#EMPTY_BYTE_ARRAY"><code>HConstants.EMPTY_BYTE_ARRAY</code></a>)
<li>Column family can't be null. In case where multiple families are
provided, an IOException will be thrown. An optional column qualifier can
also be defined.</li>
<li>For methods to find maximum, minimum, sum, rowcount, it returns the
parameter type. For average and std, it returns a double value. For row
count, it returns a long value.</li>
</ul>
<p>Call <a href="../../../../../../org/apache/hadoop/hbase/client/coprocessor/AggregationClient.html#close--"><code>close()</code></a> when done.</div>
</li>
</ul>
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<caption><span>Nested Classes</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Class and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>(package private) static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/client/coprocessor/AggregationClient.AggregationClientRpcController.html" title="class in org.apache.hadoop.hbase.client.coprocessor">AggregationClient.AggregationClientRpcController</a></span></code>
<div class="block">An RpcController implementation for use here in this endpoint.</div>
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<th class="colLast" scope="col">Field and Description</th>
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<td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/client/Connection.html" title="interface in org.apache.hadoop.hbase.client">Connection</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/client/coprocessor/AggregationClient.html#connection">connection</a></span></code>&nbsp;</td>
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<tr class="rowColor">
<td class="colFirst"><code>private static org.slf4j.Logger</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/client/coprocessor/AggregationClient.html#log">log</a></span></code>&nbsp;</td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/client/coprocessor/AggregationClient.html#AggregationClient-org.apache.hadoop.conf.Configuration-">AggregationClient</a></span>(org.apache.hadoop.conf.Configuration&nbsp;cfg)</code>
<div class="block">Constructor with Conf object</div>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code>&lt;R,S,P extends com.google.protobuf.Message,Q extends com.google.protobuf.Message,T extends com.google.protobuf.Message&gt;<br>double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/client/coprocessor/AggregationClient.html#avg-org.apache.hadoop.hbase.client.Table-org.apache.hadoop.hbase.coprocessor.ColumnInterpreter-org.apache.hadoop.hbase.client.Scan-">avg</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/client/Table.html" title="interface in org.apache.hadoop.hbase.client">Table</a>&nbsp;table,
<a href="../../../../../../org/apache/hadoop/hbase/coprocessor/ColumnInterpreter.html" title="class in org.apache.hadoop.hbase.coprocessor">ColumnInterpreter</a>&lt;R,S,P,Q,T&gt;&nbsp;ci,
<a href="../../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client">Scan</a>&nbsp;scan)</code>
<div class="block">This is the client side interface/handle for calling the average method for
a given cf-cq combination.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>&lt;R,S,P extends com.google.protobuf.Message,Q extends com.google.protobuf.Message,T extends com.google.protobuf.Message&gt;<br>double</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/client/coprocessor/AggregationClient.html#avg-org.apache.hadoop.hbase.TableName-org.apache.hadoop.hbase.coprocessor.ColumnInterpreter-org.apache.hadoop.hbase.client.Scan-">avg</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/TableName.html" title="class in org.apache.hadoop.hbase">TableName</a>&nbsp;tableName,
<a href="../../../../../../org/apache/hadoop/hbase/coprocessor/ColumnInterpreter.html" title="class in org.apache.hadoop.hbase.coprocessor">ColumnInterpreter</a>&lt;R,S,P,Q,T&gt;&nbsp;ci,
<a href="../../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client">Scan</a>&nbsp;scan)</code>
<div class="block">This is the client side interface/handle for calling the average method for
a given cf-cq combination.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/client/coprocessor/AggregationClient.html#close--">close</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>private &lt;R,S,P extends com.google.protobuf.Message,Q extends com.google.protobuf.Message,T extends com.google.protobuf.Message&gt;<br><a href="../../../../../../org/apache/hadoop/hbase/util/Pair.html" title="class in org.apache.hadoop.hbase.util">Pair</a>&lt;S,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/client/coprocessor/AggregationClient.html#getAvgArgs-org.apache.hadoop.hbase.client.Table-org.apache.hadoop.hbase.coprocessor.ColumnInterpreter-org.apache.hadoop.hbase.client.Scan-">getAvgArgs</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/client/Table.html" title="interface in org.apache.hadoop.hbase.client">Table</a>&nbsp;table,
<a href="../../../../../../org/apache/hadoop/hbase/coprocessor/ColumnInterpreter.html" title="class in org.apache.hadoop.hbase.coprocessor">ColumnInterpreter</a>&lt;R,S,P,Q,T&gt;&nbsp;ci,
<a href="../../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client">Scan</a>&nbsp;scan)</code>
<div class="block">It computes average while fetching sum and row count from all the
corresponding regions.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>private &lt;R,S,P extends com.google.protobuf.Message,Q extends com.google.protobuf.Message,T extends com.google.protobuf.Message&gt;<br><a href="../../../../../../org/apache/hadoop/hbase/util/Pair.html" title="class in org.apache.hadoop.hbase.util">Pair</a>&lt;S,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/client/coprocessor/AggregationClient.html#getAvgArgs-org.apache.hadoop.hbase.TableName-org.apache.hadoop.hbase.coprocessor.ColumnInterpreter-org.apache.hadoop.hbase.client.Scan-">getAvgArgs</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/TableName.html" title="class in org.apache.hadoop.hbase">TableName</a>&nbsp;tableName,
<a href="../../../../../../org/apache/hadoop/hbase/coprocessor/ColumnInterpreter.html" title="class in org.apache.hadoop.hbase.coprocessor">ColumnInterpreter</a>&lt;R,S,P,Q,T&gt;&nbsp;ci,
<a href="../../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client">Scan</a>&nbsp;scan)</code>
<div class="block">It computes average while fetching sum and row count from all the
corresponding regions.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>(package private) byte[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/client/coprocessor/AggregationClient.html#getBytesFromResponse-com.google.protobuf.ByteString-">getBytesFromResponse</a></span>(com.google.protobuf.ByteString&nbsp;response)</code>&nbsp;</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>private &lt;R,S,P extends com.google.protobuf.Message,Q extends com.google.protobuf.Message,T extends com.google.protobuf.Message&gt;<br><a href="../../../../../../org/apache/hadoop/hbase/util/Pair.html" title="class in org.apache.hadoop.hbase.util">Pair</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/NavigableMap.html?is-external=true" title="class or interface in java.util">NavigableMap</a>&lt;byte[],<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;S&gt;&gt;,<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;S&gt;&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/client/coprocessor/AggregationClient.html#getMedianArgs-org.apache.hadoop.hbase.client.Table-org.apache.hadoop.hbase.coprocessor.ColumnInterpreter-org.apache.hadoop.hbase.client.Scan-">getMedianArgs</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/client/Table.html" title="interface in org.apache.hadoop.hbase.client">Table</a>&nbsp;table,
<a href="../../../../../../org/apache/hadoop/hbase/coprocessor/ColumnInterpreter.html" title="class in org.apache.hadoop.hbase.coprocessor">ColumnInterpreter</a>&lt;R,S,P,Q,T&gt;&nbsp;ci,
<a href="../../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client">Scan</a>&nbsp;scan)</code>
<div class="block">It helps locate the region with median for a given column whose weight
is specified in an optional column.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>private &lt;R,S,P extends com.google.protobuf.Message,Q extends com.google.protobuf.Message,T extends com.google.protobuf.Message&gt;<br><a href="../../../../../../org/apache/hadoop/hbase/util/Pair.html" title="class in org.apache.hadoop.hbase.util">Pair</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;S&gt;,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/client/coprocessor/AggregationClient.html#getStdArgs-org.apache.hadoop.hbase.client.Table-org.apache.hadoop.hbase.coprocessor.ColumnInterpreter-org.apache.hadoop.hbase.client.Scan-">getStdArgs</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/client/Table.html" title="interface in org.apache.hadoop.hbase.client">Table</a>&nbsp;table,
<a href="../../../../../../org/apache/hadoop/hbase/coprocessor/ColumnInterpreter.html" title="class in org.apache.hadoop.hbase.coprocessor">ColumnInterpreter</a>&lt;R,S,P,Q,T&gt;&nbsp;ci,
<a href="../../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client">Scan</a>&nbsp;scan)</code>
<div class="block">It computes a global standard deviation for a given column and its value.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>&lt;R,S,P extends com.google.protobuf.Message,Q extends com.google.protobuf.Message,T extends com.google.protobuf.Message&gt;<br>R</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/client/coprocessor/AggregationClient.html#max-org.apache.hadoop.hbase.client.Table-org.apache.hadoop.hbase.coprocessor.ColumnInterpreter-org.apache.hadoop.hbase.client.Scan-">max</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/client/Table.html" title="interface in org.apache.hadoop.hbase.client">Table</a>&nbsp;table,
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<a href="../../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client">Scan</a>&nbsp;scan)</code>
<div class="block">It gives the maximum value of a column for a given column family for the
given range.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>&lt;R,S,P extends com.google.protobuf.Message,Q extends com.google.protobuf.Message,T extends com.google.protobuf.Message&gt;<br>R</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/client/coprocessor/AggregationClient.html#max-org.apache.hadoop.hbase.TableName-org.apache.hadoop.hbase.coprocessor.ColumnInterpreter-org.apache.hadoop.hbase.client.Scan-">max</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/TableName.html" title="class in org.apache.hadoop.hbase">TableName</a>&nbsp;tableName,
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<a href="../../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client">Scan</a>&nbsp;scan)</code>
<div class="block">It gives the maximum value of a column for a given column family for the
given range.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>&lt;R,S,P extends com.google.protobuf.Message,Q extends com.google.protobuf.Message,T extends com.google.protobuf.Message&gt;<br>R</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/client/coprocessor/AggregationClient.html#median-org.apache.hadoop.hbase.client.Table-org.apache.hadoop.hbase.coprocessor.ColumnInterpreter-org.apache.hadoop.hbase.client.Scan-">median</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/client/Table.html" title="interface in org.apache.hadoop.hbase.client">Table</a>&nbsp;table,
<a href="../../../../../../org/apache/hadoop/hbase/coprocessor/ColumnInterpreter.html" title="class in org.apache.hadoop.hbase.coprocessor">ColumnInterpreter</a>&lt;R,S,P,Q,T&gt;&nbsp;ci,
<a href="../../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client">Scan</a>&nbsp;scan)</code>
<div class="block">This is the client side interface/handler for calling the median method for a
given cf-cq combination.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>&lt;R,S,P extends com.google.protobuf.Message,Q extends com.google.protobuf.Message,T extends com.google.protobuf.Message&gt;<br>R</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/client/coprocessor/AggregationClient.html#median-org.apache.hadoop.hbase.TableName-org.apache.hadoop.hbase.coprocessor.ColumnInterpreter-org.apache.hadoop.hbase.client.Scan-">median</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/TableName.html" title="class in org.apache.hadoop.hbase">TableName</a>&nbsp;tableName,
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<a href="../../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client">Scan</a>&nbsp;scan)</code>
<div class="block">This is the client side interface/handler for calling the median method for a
given cf-cq combination.</div>
</td>
</tr>
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<td class="colFirst"><code>&lt;R,S,P extends com.google.protobuf.Message,Q extends com.google.protobuf.Message,T extends com.google.protobuf.Message&gt;<br>R</code></td>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>&lt;R, S&gt;</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></code> - The caller is supposed to handle the exception as they are thrown
&amp; propagated to it.</dd>
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</li>
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<div class="block">It gives the row count, by summing up the individual results obtained from
regions. In case the qualifier is null, FirstKeyValueFilter is used to
optimised the operation. In case qualifier is provided, I can't use the
filter as it may set the flag to skip to next row, but the value read is
not of the given filter: in this case, this particular row will not be
counted ==&gt; an error.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>table</code> - table to scan.</dd>
<dd><code>ci</code> - the user's ColumnInterpreter implementation</dd>
<dd><code>scan</code> - the HBase scan object to use to read data from HBase</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>&lt;R, S&gt;</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></code> - The caller is supposed to handle the exception as they are thrown
&amp; propagated to it.</dd>
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<div class="block">It sums up the value returned from various regions. In case qualifier is
null, summation of all the column qualifiers in the given family is done.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>tableName</code> - the name of the table to scan</dd>
<dd><code>ci</code> - the user's ColumnInterpreter implementation</dd>
<dd><code>scan</code> - the HBase scan object to use to read data from HBase</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>sum &lt;S&gt;</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></code> - The caller is supposed to handle the exception as they are thrown
&amp; propagated to it.</dd>
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throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></pre>
<div class="block">It sums up the value returned from various regions. In case qualifier is
null, summation of all the column qualifiers in the given family is done.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>table</code> - table to scan.</dd>
<dd><code>ci</code> - the user's ColumnInterpreter implementation</dd>
<dd><code>scan</code> - the HBase scan object to use to read data from HBase</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>sum &lt;S&gt;</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></code> - The caller is supposed to handle the exception as they are thrown
&amp; propagated to it.</dd>
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throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></pre>
<div class="block">It computes average while fetching sum and row count from all the
corresponding regions. Approach is to compute a global sum of region level
sum and rowcount and then compute the average.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>tableName</code> - the name of the table to scan</dd>
<dd><code>scan</code> - the HBase scan object to use to read data from HBase</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></code> - The caller is supposed to handle the exception as they are thrown
&amp; propagated to it.</dd>
</dl>
</li>
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throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></pre>
<div class="block">It computes average while fetching sum and row count from all the
corresponding regions. Approach is to compute a global sum of region level
sum and rowcount and then compute the average.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>table</code> - table to scan.</dd>
<dd><code>scan</code> - the HBase scan object to use to read data from HBase</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></code> - The caller is supposed to handle the exception as they are thrown
&amp; propagated to it.</dd>
</dl>
</li>
</ul>
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throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></pre>
<div class="block">This is the client side interface/handle for calling the average method for
a given cf-cq combination. It was necessary to add one more call stack as
its return type should be a decimal value, irrespective of what
columninterpreter says. So, this methods collects the necessary parameters
to compute the average and returs the double value.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>tableName</code> - the name of the table to scan</dd>
<dd><code>ci</code> - the user's ColumnInterpreter implementation</dd>
<dd><code>scan</code> - the HBase scan object to use to read data from HBase</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>&lt;R, S&gt;</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></code> - The caller is supposed to handle the exception as they are thrown
&amp; propagated to it.</dd>
</dl>
</li>
</ul>
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<div class="block">This is the client side interface/handle for calling the average method for
a given cf-cq combination. It was necessary to add one more call stack as
its return type should be a decimal value, irrespective of what
columninterpreter says. So, this methods collects the necessary parameters
to compute the average and returs the double value.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>table</code> - table to scan.</dd>
<dd><code>ci</code> - the user's ColumnInterpreter implementation</dd>
<dd><code>scan</code> - the HBase scan object to use to read data from HBase</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>&lt;R, S&gt;</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></code> - The caller is supposed to handle the exception as they are thrown
&amp; propagated to it.</dd>
</dl>
</li>
</ul>
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throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></pre>
<div class="block">It computes a global standard deviation for a given column and its value.
Standard deviation is square root of (average of squares -
average*average). From individual regions, it obtains sum, square sum and
number of rows. With these, the above values are computed to get the global
std.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>table</code> - table to scan.</dd>
<dd><code>scan</code> - the HBase scan object to use to read data from HBase</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>standard deviations</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></code> - The caller is supposed to handle the exception as they are thrown
&amp; propagated to it.</dd>
</dl>
</li>
</ul>
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throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></pre>
<div class="block">This is the client side interface/handle for calling the std method for a
given cf-cq combination. It was necessary to add one more call stack as its
return type should be a decimal value, irrespective of what
columninterpreter says. So, this methods collects the necessary parameters
to compute the std and returns the double value.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>tableName</code> - the name of the table to scan</dd>
<dd><code>ci</code> - the user's ColumnInterpreter implementation</dd>
<dd><code>scan</code> - the HBase scan object to use to read data from HBase</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>&lt;R, S&gt;</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></code> - The caller is supposed to handle the exception as they are thrown
&amp; propagated to it.</dd>
</dl>
</li>
</ul>
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throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></pre>
<div class="block">This is the client side interface/handle for calling the std method for a
given cf-cq combination. It was necessary to add one more call stack as its
return type should be a decimal value, irrespective of what
columninterpreter says. So, this methods collects the necessary parameters
to compute the std and returns the double value.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>table</code> - table to scan.</dd>
<dd><code>ci</code> - the user's ColumnInterpreter implementation</dd>
<dd><code>scan</code> - the HBase scan object to use to read data from HBase</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>&lt;R, S&gt;</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></code> - The caller is supposed to handle the exception as they are thrown
&amp; propagated to it.</dd>
</dl>
</li>
</ul>
<a name="getMedianArgs-org.apache.hadoop.hbase.client.Table-org.apache.hadoop.hbase.coprocessor.ColumnInterpreter-org.apache.hadoop.hbase.client.Scan-">
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throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></pre>
<div class="block">It helps locate the region with median for a given column whose weight
is specified in an optional column.
From individual regions, it obtains sum of values and sum of weights.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>table</code> - table to scan.</dd>
<dd><code>ci</code> - the user's ColumnInterpreter implementation</dd>
<dd><code>scan</code> - the HBase scan object to use to read data from HBase</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>pair whose first element is a map between start row of the region
and (sum of values, sum of weights) for the region, the second element is
(sum of values, sum of weights) for all the regions chosen</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></code> - The caller is supposed to handle the exception as they are thrown
&amp; propagated to it.</dd>
</dl>
</li>
</ul>
<a name="median-org.apache.hadoop.hbase.TableName-org.apache.hadoop.hbase.coprocessor.ColumnInterpreter-org.apache.hadoop.hbase.client.Scan-">
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<h4>median</h4>
<pre>public&nbsp;&lt;R,S,P extends com.google.protobuf.Message,Q extends com.google.protobuf.Message,T extends com.google.protobuf.Message&gt;&nbsp;R&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/client/coprocessor/AggregationClient.html#line.753">median</a>(<a href="../../../../../../org/apache/hadoop/hbase/TableName.html" title="class in org.apache.hadoop.hbase">TableName</a>&nbsp;tableName,
<a href="../../../../../../org/apache/hadoop/hbase/coprocessor/ColumnInterpreter.html" title="class in org.apache.hadoop.hbase.coprocessor">ColumnInterpreter</a>&lt;R,S,P,Q,T&gt;&nbsp;ci,
<a href="../../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client">Scan</a>&nbsp;scan)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></pre>
<div class="block">This is the client side interface/handler for calling the median method for a
given cf-cq combination. This method collects the necessary parameters
to compute the median and returns the median.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>tableName</code> - the name of the table to scan</dd>
<dd><code>ci</code> - the user's ColumnInterpreter implementation</dd>
<dd><code>scan</code> - the HBase scan object to use to read data from HBase</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>R the median</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></code> - The caller is supposed to handle the exception as they are thrown
&amp; propagated to it.</dd>
</dl>
</li>
</ul>
<a name="median-org.apache.hadoop.hbase.client.Table-org.apache.hadoop.hbase.coprocessor.ColumnInterpreter-org.apache.hadoop.hbase.client.Scan-">
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<h4>median</h4>
<pre>public&nbsp;&lt;R,S,P extends com.google.protobuf.Message,Q extends com.google.protobuf.Message,T extends com.google.protobuf.Message&gt;&nbsp;R&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/client/coprocessor/AggregationClient.html#line.772">median</a>(<a href="../../../../../../org/apache/hadoop/hbase/client/Table.html" title="interface in org.apache.hadoop.hbase.client">Table</a>&nbsp;table,
<a href="../../../../../../org/apache/hadoop/hbase/coprocessor/ColumnInterpreter.html" title="class in org.apache.hadoop.hbase.coprocessor">ColumnInterpreter</a>&lt;R,S,P,Q,T&gt;&nbsp;ci,
<a href="../../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client">Scan</a>&nbsp;scan)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></pre>
<div class="block">This is the client side interface/handler for calling the median method for a
given cf-cq combination. This method collects the necessary parameters
to compute the median and returns the median.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>table</code> - table to scan.</dd>
<dd><code>ci</code> - the user's ColumnInterpreter implementation</dd>
<dd><code>scan</code> - the HBase scan object to use to read data from HBase</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>R the median</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></code> - The caller is supposed to handle the exception as they are thrown
&amp; propagated to it.</dd>
</dl>
</li>
</ul>
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<h4>getBytesFromResponse</h4>
<pre>byte[]&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/client/coprocessor/AggregationClient.html#line.846">getBytesFromResponse</a>(com.google.protobuf.ByteString&nbsp;response)</pre>
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