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Any use of Connection from @@ -264,21 +270,49 @@ extends <a href="../../../../../org/apache/hadoop/hbase/CoprocessorEnvironment.h <p>Using a Connection to get at a local resource -- say a Region that is on the local Server or using Admin Interface from a Coprocessor hosted on the Master -- will result in a - short-circuit of the RPC framework to make a direct invocation avoiding RPC (and - protobuf marshalling/unmarshalling).</div> + short-circuit of the RPC framework to make a direct invocation avoiding RPC. +<p> + Note: If you want to create Connection with your own Configuration and NOT use the RegionServer + Connection (though its cache of locations will be warm, and its life-cycle is not the concern + of the CP), see <a href="../../../../../org/apache/hadoop/hbase/coprocessor/RegionCoprocessorEnvironment.html#createConnection-org.apache.hadoop.conf.Configuration-"><code>createConnection(Configuration)</code></a>.</div> <dl> <dt><span class="returnLabel">Returns:</span></dt> <dd>The host's Connection to the Cluster.</dd> </dl> </li> </ul> +<a name="createConnection-org.apache.hadoop.conf.Configuration-"> +<!-- --> +</a> +<ul class="blockList"> +<li class="blockList"> +<h4>createConnection</h4> +<pre><a href="../../../../../org/apache/hadoop/hbase/client/Connection.html" title="interface in org.apache.hadoop.hbase.client">Connection</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/coprocessor/RegionCoprocessorEnvironment.html#line.88">createConnection</a>(org.apache.hadoop.conf.Configuration conf) + throws <a href="http://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true"; title="class or interface in java.io">IOException</a></pre> +<div class="block">Creates a cluster connection using the passed configuration. + <p>Using this Connection to get at a local resource -- say a Region that is on the local + Server or using Admin Interface from a Coprocessor hosted on the Master -- will result in a + short-circuit of the RPC framework to make a direct invocation avoiding RPC. + <p> + Note: HBase will NOT cache/maintain this Connection. If Coprocessors need to cache and reuse + this connection, it has to be done by Coprocessors. Also make sure to close it after use.</div> +<dl> +<dt><span class="paramLabel">Parameters:</span></dt> +<dd><code>conf</code> - configuration</dd> +<dt><span class="returnLabel">Returns:</span></dt> +<dd>Connection created using the passed conf.</dd> +<dt><span class="throwsLabel">Throws:</span></dt> +<dd><code><a href="http://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true"; title="class or interface in java.io">IOException</a></code></dd> +</dl> +</li> +</ul> <a name="getMetricRegistryForRegionServer--"> <!-- --> </a> <ul class="blockListLast"> <li class="blockList"> <h4>getMetricRegistryForRegionServer</h4> -<pre><a href="../../../../../org/apache/hadoop/hbase/metrics/MetricRegistry.html" title="interface in org.apache.hadoop.hbase.metrics">MetricRegistry</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/coprocessor/RegionCoprocessorEnvironment.html#line.87">getMetricRegistryForRegionServer</a>()</pre> +<pre><a href="../../../../../org/apache/hadoop/hbase/metrics/MetricRegistry.html" title="interface in org.apache.hadoop.hbase.metrics">MetricRegistry</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/coprocessor/RegionCoprocessorEnvironment.html#line.105">getMetricRegistryForRegionServer</a>()</pre> <div class="block">Returns a MetricRegistry that can be used to track metrics at the region server level. All metrics tracked at this level will be shared by all the coprocessor instances of the same class in the same region server process. Note that there will be one
