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<div class="subTitle">org.apache.ignite.igfs</div>
<h2 title="Class IgfsGroupDataBlocksKeyMapper" class="title">Class IgfsGroupDataBlocksKeyMapper</h2>
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<li>org.apache.ignite.internal.processors.cache.GridCacheDefaultAffinityKeyMapper</li>
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<li>org.apache.ignite.igfs.IgfsGroupDataBlocksKeyMapper</li>
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<pre>public class <span class="strong">IgfsGroupDataBlocksKeyMapper</span>
extends org.apache.ignite.internal.processors.cache.GridCacheDefaultAffinityKeyMapper</pre>
<div class="block"><code>IGFS</code> class providing ability to group file's data blocks together on one node.
All blocks within the same group are guaranteed to be cached together on the same node.
Group size parameter controls how many sequential blocks will be cached together on the same node.
<p>
For example, if block size is <code>64kb</code> and group size is <code>256</code>, then each group will contain
<code>64kb * 256 = 16Mb</code>. Larger group sizes would reduce number of splits required to run map-reduce
tasks, but will increase inequality of data size being stored on different nodes.
<p>
Note that <a href="../../../../org/apache/ignite/igfs/IgfsGroupDataBlocksKeyMapper.html#getGroupSize()"><code>getGroupSize()</code></a> parameter must correlate to Hadoop split size parameter defined
in Hadoop via <code>mapred.max.split.size</code> property. Ideally you want all blocks accessed
within one split to be mapped to <code>1</code> group, so they can be located on the same grid node.
For example, default Hadoop split size is <code>64mb</code> and default <code>IGFS</code> block size
is <code>64kb</code>. This means that to make sure that each split goes only through blocks on
the same node (without hopping between nodes over network), we have to make the <a href="../../../../org/apache/ignite/igfs/IgfsGroupDataBlocksKeyMapper.html#getGroupSize()"><code>getGroupSize()</code></a>
value be equal to <code>64mb / 64kb = 1024</code>.
<p>
It is required for <code>IGFS</code> data cache to be configured with this mapper. Here is an
example of how it can be specified in XML configuration:
<pre name="code" class="xml">
&lt;bean id="cacheCfgBase" class="org.apache.ignite.cache.CacheConfiguration" abstract="true"&gt;
...
&lt;property name="affinityMapper"&gt;
&lt;bean class="org.apache.ignite.igfs.IgfsGroupDataBlocksKeyMapper"&gt;
&lt;!-- How many sequential blocks will be stored on the same node. --&gt;
&lt;property name="groupSize" value="512"/&gt;
&lt;/bean&gt;
&lt;/property&gt;
...
&lt;/bean&gt;
</pre></div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../serialized-form.html#org.apache.ignite.igfs.IgfsGroupDataBlocksKeyMapper">Serialized Form</a></dd></dl>
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/ignite/igfs/IgfsGroupDataBlocksKeyMapper.html#DFLT_GRP_SIZE">DFLT_GRP_SIZE</a></strong></code>
<div class="block">Default group size.</div>
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<td class="colOne"><code><strong><a href="../../../../org/apache/ignite/igfs/IgfsGroupDataBlocksKeyMapper.html#IgfsGroupDataBlocksKeyMapper()">IgfsGroupDataBlocksKeyMapper</a></strong>()</code>
<div class="block">Default constructor.</div>
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<td class="colOne"><code><strong><a href="../../../../org/apache/ignite/igfs/IgfsGroupDataBlocksKeyMapper.html#IgfsGroupDataBlocksKeyMapper(int)">IgfsGroupDataBlocksKeyMapper</a></strong>(int&nbsp;grpSize)</code>
<div class="block">Constructs affinity mapper to group several data blocks with the same key.</div>
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<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/ignite/igfs/IgfsGroupDataBlocksKeyMapper.html#affinityKey(java.lang.Object)">affinityKey</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;key)</code>
<div class="block">If key class has annotation <a href="../../../../org/apache/ignite/cache/affinity/AffinityKeyMapped.html" title="annotation in org.apache.ignite.cache.affinity"><code>AffinityKeyMapped</code></a>,
then the value of annotated method or field will be used to get affinity value instead
of the key itself.</div>
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<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/ignite/igfs/IgfsGroupDataBlocksKeyMapper.html#getGroupSize()">getGroupSize</a></strong>()</code>
<div class="block">Get group size.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/ignite/igfs/IgfsGroupDataBlocksKeyMapper.html#setGroupSize(int)">setGroupSize</a></strong>(int&nbsp;grpSize)</code>
<div class="block">Set group size.</div>
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<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/ignite/igfs/IgfsGroupDataBlocksKeyMapper.html#toString()">toString</a></strong>()</code></td>
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<h4>DFLT_GRP_SIZE</h4>
<pre>public static final&nbsp;int DFLT_GRP_SIZE</pre>
<div class="block">Default group size.</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../constant-values.html#org.apache.ignite.igfs.IgfsGroupDataBlocksKeyMapper.DFLT_GRP_SIZE">Constant Field Values</a></dd></dl>
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<h4>IgfsGroupDataBlocksKeyMapper</h4>
<pre>public&nbsp;IgfsGroupDataBlocksKeyMapper()</pre>
<div class="block">Default constructor.</div>
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<h4>IgfsGroupDataBlocksKeyMapper</h4>
<pre>public&nbsp;IgfsGroupDataBlocksKeyMapper(int&nbsp;grpSize)</pre>
<div class="block">Constructs affinity mapper to group several data blocks with the same key.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>grpSize</code> - Size of the group in blocks.</dd></dl>
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<h4>affinityKey</h4>
<pre>public&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;affinityKey(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;key)</pre>
<div class="block">If key class has annotation <a href="../../../../org/apache/ignite/cache/affinity/AffinityKeyMapped.html" title="annotation in org.apache.ignite.cache.affinity"><code>AffinityKeyMapped</code></a>,
then the value of annotated method or field will be used to get affinity value instead
of the key itself. If there is no annotation, then the key is returned as is.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../org/apache/ignite/cache/affinity/AffinityKeyMapper.html#affinityKey(java.lang.Object)">affinityKey</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/ignite/cache/affinity/AffinityKeyMapper.html" title="interface in org.apache.ignite.cache.affinity">AffinityKeyMapper</a></code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code>affinityKey</code>&nbsp;in class&nbsp;<code>org.apache.ignite.internal.processors.cache.GridCacheDefaultAffinityKeyMapper</code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>key</code> - Key to get affinity key for.</dd>
<dt><span class="strong">Returns:</span></dt><dd>Affinity key for given key.</dd></dl>
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<h4>getGroupSize</h4>
<pre>public&nbsp;int&nbsp;getGroupSize()</pre>
<div class="block">Get group size.
<p>
Group size defines how many sequential file blocks will reside on the same node. This parameter
must correlate to Hadoop split size parameter defined in Hadoop via <code>mapred.max.split.size</code>
property. Ideally you want all blocks accessed within one split to be mapped to <code>1</code> group,
so they can be located on the same grid node. For example, default Hadoop split size is <code>64mb</code>
and default <code>IGFS</code> block size is <code>64kb</code>. This means that to make sure that each split
goes only through blocks on the same node (without hopping between nodes over network), we have to
make the group size be equal to <code>64mb / 64kb = 1024</code>.
<p>
Defaults to <a href="../../../../org/apache/ignite/igfs/IgfsGroupDataBlocksKeyMapper.html#DFLT_GRP_SIZE"><code>DFLT_GRP_SIZE</code></a>.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>Group size.</dd></dl>
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<h4>setGroupSize</h4>
<pre>public&nbsp;void&nbsp;setGroupSize(int&nbsp;grpSize)</pre>
<div class="block">Set group size. See <a href="../../../../org/apache/ignite/igfs/IgfsGroupDataBlocksKeyMapper.html#getGroupSize()"><code>getGroupSize()</code></a> for more information.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>grpSize</code> - Group size.</dd></dl>
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<h4>toString</h4>
<pre>public&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;toString()</pre>
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