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| <h2 title="Interface RegionNormalizer" class="title">Interface RegionNormalizer</h2> |
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| <pre>@InterfaceAudience.Private |
| interface <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/normalizer/RegionNormalizer.html#line.38">RegionNormalizer</a> |
| extends org.apache.hadoop.conf.Configurable</pre> |
| <div class="block">Performs "normalization" of regions of a table, making sure that suboptimal |
| choice of split keys doesn't leave cluster in a situation when some regions are |
| substantially larger than others for considerable amount of time. |
| |
| Users who want to use this feature could either use default <a href="../../../../../../org/apache/hadoop/hbase/master/normalizer/SimpleRegionNormalizer.html" title="class in org.apache.hadoop.hbase.master.normalizer"><code>SimpleRegionNormalizer</code></a> |
| or plug in their own implementation. Please note that overly aggressive normalization rules |
| (attempting to make all regions perfectly equal in size) could potentially lead to |
| "split/merge storms".</div> |
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| <td class="colFirst"><code><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><<a href="../../../../../../org/apache/hadoop/hbase/master/normalizer/NormalizationPlan.html" title="interface in org.apache.hadoop.hbase.master.normalizer">NormalizationPlan</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/normalizer/RegionNormalizer.html#computePlansForTable-org.apache.hadoop.hbase.client.TableDescriptor-">computePlansForTable</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/client/TableDescriptor.html" title="interface in org.apache.hadoop.hbase.client">TableDescriptor</a> tableDescriptor)</code> |
| <div class="block">Computes a list of normalizer actions to perform on the target table.</div> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/normalizer/RegionNormalizer.html#setMasterServices-org.apache.hadoop.hbase.master.MasterServices-">setMasterServices</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/master/MasterServices.html" title="interface in org.apache.hadoop.hbase.master">MasterServices</a> masterServices)</code> |
| <div class="block">Set the master service.</div> |
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| <code>getConf, setConf</code></li> |
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| <h4>setMasterServices</h4> |
| <pre>void <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/normalizer/RegionNormalizer.html#line.44">setMasterServices</a>(<a href="../../../../../../org/apache/hadoop/hbase/master/MasterServices.html" title="interface in org.apache.hadoop.hbase.master">MasterServices</a> masterServices)</pre> |
| <div class="block">Set the master service. Must be called before first call to |
| <a href="../../../../../../org/apache/hadoop/hbase/master/normalizer/RegionNormalizer.html#computePlansForTable-org.apache.hadoop.hbase.client.TableDescriptor-"><code>computePlansForTable(TableDescriptor)</code></a>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>masterServices</code> - master services to use</dd> |
| </dl> |
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| <h4>computePlansForTable</h4> |
| <pre><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><<a href="../../../../../../org/apache/hadoop/hbase/master/normalizer/NormalizationPlan.html" title="interface in org.apache.hadoop.hbase.master.normalizer">NormalizationPlan</a>> <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/normalizer/RegionNormalizer.html#line.53">computePlansForTable</a>(<a href="../../../../../../org/apache/hadoop/hbase/client/TableDescriptor.html" title="interface in org.apache.hadoop.hbase.client">TableDescriptor</a> tableDescriptor)</pre> |
| <div class="block">Computes a list of normalizer actions to perform on the target table. This is the primary |
| entry-point from the Master driving a normalization activity.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>tableDescriptor</code> - table descriptor for table which needs normalize</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>A list of the normalization actions to perform, or an empty list |
| if there's nothing to do.</dd> |
| </dl> |
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