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| <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"> |
| <bean id="cacheCfgBase" class="org.apache.ignite.cache.CacheConfiguration" abstract="true"> |
| ... |
| <property name="affinityMapper"> |
| <bean class="org.apache.ignite.igfs.IgfsGroupDataBlocksKeyMapper"> |
| <!-- How many sequential blocks will be stored on the same node. --> |
| <property name="groupSize" value="512"/> |
| </bean> |
| </property> |
| ... |
| </bean> |
| </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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| <code>ignite, log</code></li> |
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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> |
| </td> |
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| <tr class="rowColor"> |
| <td class="colOne"><code><strong><a href="../../../../org/apache/ignite/igfs/IgfsGroupDataBlocksKeyMapper.html#IgfsGroupDataBlocksKeyMapper(int)">IgfsGroupDataBlocksKeyMapper</a></strong>(int 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> 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> |
| </td> |
| </tr> |
| <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> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/ignite/igfs/IgfsGroupDataBlocksKeyMapper.html" title="class in org.apache.ignite.igfs">IgfsGroupDataBlocksKeyMapper</a></code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/ignite/igfs/IgfsGroupDataBlocksKeyMapper.html#setGroupSize(int)">setGroupSize</a></strong>(int grpSize)</code> |
| <div class="block">Set group size.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <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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| <h3>Methods inherited from class org.apache.ignite.internal.processors.cache.GridCacheDefaultAffinityKeyMapper</h3> |
| <code>affinityKeyPropertyName, ignite, reset</code></li> |
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| <a name="DFLT_GRP_SIZE"> |
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| <h4>DFLT_GRP_SIZE</h4> |
| <pre>public static final 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 IgfsGroupDataBlocksKeyMapper()</pre> |
| <div class="block">Default constructor.</div> |
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| <a name="IgfsGroupDataBlocksKeyMapper(int)"> |
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| <h4>IgfsGroupDataBlocksKeyMapper</h4> |
| <pre>public IgfsGroupDataBlocksKeyMapper(int 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> |
| </li> |
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| <h4>affinityKey</h4> |
| <pre>public <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> 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> 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> in interface <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> in class <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> |
| </li> |
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| <a name="getGroupSize()"> |
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| <h4>getGroupSize</h4> |
| <pre>public int 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> |
| </li> |
| </ul> |
| <a name="setGroupSize(int)"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>setGroupSize</h4> |
| <pre>public <a href="../../../../org/apache/ignite/igfs/IgfsGroupDataBlocksKeyMapper.html" title="class in org.apache.ignite.igfs">IgfsGroupDataBlocksKeyMapper</a> setGroupSize(int 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> |
| <dt><span class="strong">Returns:</span></dt><dd><code>this</code> for chaining.</dd></dl> |
| </li> |
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| <h4>toString</h4> |
| <pre>public <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> toString()</pre> |
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