| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
| <!-- NewPage --> |
| <html lang="en"> |
| <head> |
| <!-- Generated by javadoc --> |
| <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> |
| <title>MasterCoprocessorEnvironment (Apache HBase 3.0.0-alpha-2-SNAPSHOT API)</title> |
| <link rel="stylesheet" type="text/css" href="../../../../../stylesheet.css" title="Style"> |
| <script type="text/javascript" src="../../../../../script.js"></script> |
| </head> |
| <body> |
| <script type="text/javascript"><!-- |
| try { |
| if (location.href.indexOf('is-external=true') == -1) { |
| parent.document.title="MasterCoprocessorEnvironment (Apache HBase 3.0.0-alpha-2-SNAPSHOT API)"; |
| } |
| } |
| catch(err) { |
| } |
| //--> |
| var methods = {"i0":6,"i1":6,"i2":6,"i3":6}; |
| var tabs = {65535:["t0","All Methods"],2:["t2","Instance Methods"],4:["t3","Abstract Methods"]}; |
| var altColor = "altColor"; |
| var rowColor = "rowColor"; |
| var tableTab = "tableTab"; |
| var activeTableTab = "activeTableTab"; |
| </script> |
| <noscript> |
| <div>JavaScript is disabled on your browser.</div> |
| </noscript> |
| <!-- ========= START OF TOP NAVBAR ======= --> |
| <div class="topNav"><a name="navbar.top"> |
| <!-- --> |
| </a> |
| <div class="skipNav"><a href="#skip.navbar.top" title="Skip navigation links">Skip navigation links</a></div> |
| <a name="navbar.top.firstrow"> |
| <!-- --> |
| </a> |
| <ul class="navList" title="Navigation"> |
| <li><a href="../../../../../overview-summary.html">Overview</a></li> |
| <li><a href="package-summary.html">Package</a></li> |
| <li class="navBarCell1Rev">Class</li> |
| <li><a href="class-use/MasterCoprocessorEnvironment.html">Use</a></li> |
| <li><a href="package-tree.html">Tree</a></li> |
| <li><a href="../../../../../deprecated-list.html">Deprecated</a></li> |
| <li><a href="../../../../../index-all.html">Index</a></li> |
| <li><a href="../../../../../help-doc.html">Help</a></li> |
| </ul> |
| </div> |
| <div class="subNav"> |
| <ul class="navList"> |
| <li><a href="../../../../../org/apache/hadoop/hbase/coprocessor/MasterCoprocessor.html" title="interface in org.apache.hadoop.hbase.coprocessor"><span class="typeNameLink">Prev Class</span></a></li> |
| <li><a href="../../../../../org/apache/hadoop/hbase/coprocessor/MasterObserver.html" title="interface in org.apache.hadoop.hbase.coprocessor"><span class="typeNameLink">Next Class</span></a></li> |
| </ul> |
| <ul class="navList"> |
| <li><a href="../../../../../index.html?org/apache/hadoop/hbase/coprocessor/MasterCoprocessorEnvironment.html" target="_top">Frames</a></li> |
| <li><a href="MasterCoprocessorEnvironment.html" target="_top">No Frames</a></li> |
| </ul> |
| <ul class="navList" id="allclasses_navbar_top"> |
| <li><a href="../../../../../allclasses-noframe.html">All Classes</a></li> |
| </ul> |
| <div> |
| <script type="text/javascript"><!-- |
| allClassesLink = document.getElementById("allclasses_navbar_top"); |
| if(window==top) { |
| allClassesLink.style.display = "block"; |
| } |
| else { |
| allClassesLink.style.display = "none"; |
| } |
| //--> |
| </script> |
| </div> |
| <div> |
| <ul class="subNavList"> |
| <li>Summary: </li> |
| <li>Nested | </li> |
| <li>Field | </li> |
| <li>Constr | </li> |
| <li><a href="#method.summary">Method</a></li> |
| </ul> |
| <ul class="subNavList"> |
| <li>Detail: </li> |
| <li>Field | </li> |
| <li>Constr | </li> |
| <li><a href="#method.detail">Method</a></li> |
| </ul> |
| </div> |
| <a name="skip.navbar.top"> |
| <!-- --> |
| </a></div> |
| <!-- ========= END OF TOP NAVBAR ========= --> |
| <!-- ======== START OF CLASS DATA ======== --> |
| <div class="header"> |
| <div class="subTitle">org.apache.hadoop.hbase.coprocessor</div> |
| <h2 title="Interface MasterCoprocessorEnvironment" class="title">Interface MasterCoprocessorEnvironment</h2> |
| </div> |
| <div class="contentContainer"> |
| <div class="description"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <dl> |
| <dt>All Superinterfaces:</dt> |
| <dd><a href="../../../../../org/apache/hadoop/hbase/CoprocessorEnvironment.html" title="interface in org.apache.hadoop.hbase">CoprocessorEnvironment</a><<a href="../../../../../org/apache/hadoop/hbase/coprocessor/MasterCoprocessor.html" title="interface in org.apache.hadoop.hbase.coprocessor">MasterCoprocessor</a>></dd> |
| </dl> |
| <dl> |
| <dt>All Known Implementing Classes:</dt> |
| <dd><a href="../../../../../org/apache/hadoop/hbase/master/MasterCoprocessorHost.MasterEnvironment.html" title="class in org.apache.hadoop.hbase.master">MasterCoprocessorHost.MasterEnvironment</a>, <a href="../../../../../org/apache/hadoop/hbase/master/MasterCoprocessorHost.MasterEnvironmentForCoreCoprocessors.html" title="class in org.apache.hadoop.hbase.master">MasterCoprocessorHost.MasterEnvironmentForCoreCoprocessors</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>@InterfaceAudience.LimitedPrivate(value="Coprocesssor") |
| @InterfaceStability.Evolving |
| public interface <a href="../../../../../src-html/org/apache/hadoop/hbase/coprocessor/MasterCoprocessorEnvironment.html#line.35">MasterCoprocessorEnvironment</a> |
| extends <a href="../../../../../org/apache/hadoop/hbase/CoprocessorEnvironment.html" title="interface in org.apache.hadoop.hbase">CoprocessorEnvironment</a><<a href="../../../../../org/apache/hadoop/hbase/coprocessor/MasterCoprocessor.html" title="interface in org.apache.hadoop.hbase.coprocessor">MasterCoprocessor</a>></pre> |
| </li> |
| </ul> |
| </div> |
| <div class="summary"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method.summary"> |
| <!-- --> |
| </a> |
| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </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><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/coprocessor/MasterCoprocessorEnvironment.html#createConnection-org.apache.hadoop.conf.Configuration-">createConnection</a></span>(org.apache.hadoop.conf.Configuration conf)</code> |
| <div class="block">Creates a cluster connection using the passed Configuration.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><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/coprocessor/MasterCoprocessorEnvironment.html#getConnection--">getConnection</a></span>()</code> |
| <div class="block">Returns the hosts' Connection to the Cluster.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/metrics/MetricRegistry.html" title="interface in org.apache.hadoop.hbase.metrics">MetricRegistry</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/coprocessor/MasterCoprocessorEnvironment.html#getMetricRegistryForMaster--">getMetricRegistryForMaster</a></span>()</code> |
| <div class="block">Returns a MetricRegistry that can be used to track metrics at the master level.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/coprocessor/MasterCoprocessorEnvironment.html#getServerName--">getServerName</a></span>()</code> </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a name="methods.inherited.from.class.org.apache.hadoop.hbase.CoprocessorEnvironment"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from interface org.apache.hadoop.hbase.<a href="../../../../../org/apache/hadoop/hbase/CoprocessorEnvironment.html" title="interface in org.apache.hadoop.hbase">CoprocessorEnvironment</a></h3> |
| <code><a href="../../../../../org/apache/hadoop/hbase/CoprocessorEnvironment.html#getClassLoader--">getClassLoader</a>, <a href="../../../../../org/apache/hadoop/hbase/CoprocessorEnvironment.html#getConfiguration--">getConfiguration</a>, <a href="../../../../../org/apache/hadoop/hbase/CoprocessorEnvironment.html#getHBaseVersion--">getHBaseVersion</a>, <a href="../../../../../org/apache/hadoop/hbase/CoprocessorEnvironment.html#getInstance--">getInstance</a>, <a href="../../../../../org/apache/hadoop/hbase/CoprocessorEnvironment.html#getLoadSequence--">getLoadSequence</a>, <a href="../../../../../org/apache/hadoop/hbase/CoprocessorEnvironment.html#getPriority--">getPriority</a>, <a href="../../../../../org/apache/hadoop/hbase/CoprocessorEnvironment.html#getVersion--">getVersion</a></code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ METHOD DETAIL ========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method.detail"> |
| <!-- --> |
| </a> |
| <h3>Method Detail</h3> |
| <a name="getServerName--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getServerName</h4> |
| <pre><a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/coprocessor/MasterCoprocessorEnvironment.html#line.39">getServerName</a>()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Hosting Server's ServerName</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getConnection--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getConnection</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/MasterCoprocessorEnvironment.html#line.67">getConnection</a>()</pre> |
| <div class="block">Returns the hosts' Connection to the Cluster. <b>Do not close! This is a shared connection |
| with the hosting server. Throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/UnsupportedOperationException.html?is-external=true" title="class or interface in java.lang"><code>UnsupportedOperationException</code></a> if you try to close |
| or abort it</b>. |
| |
| For light-weight usage only. Heavy-duty usage will pull down |
| the hosting RegionServer responsiveness as well as that of other Coprocessors making use of |
| this Connection. Use to create table on start or to do administrative operations. Coprocessors |
| should create their own Connections if heavy usage to avoid impinging on hosting Server |
| operation. To create a Connection or if a Coprocessor requires a region with a particular |
| Configuration, use <a href="../../../../../org/apache/hadoop/hbase/client/ConnectionFactory.html" title="class in org.apache.hadoop.hbase.client"><code>ConnectionFactory</code></a> or |
| <a href="../../../../../org/apache/hadoop/hbase/coprocessor/MasterCoprocessorEnvironment.html#createConnection-org.apache.hadoop.conf.Configuration-"><code>createConnection(Configuration)</code></a>}. |
| |
| <p>Be aware that operations that make use of this Connection are executed as the RegionServer |
| User, the hbase super user that started this server process. Exercise caution running |
| operations as this User (See <a href="../../../../../org/apache/hadoop/hbase/coprocessor/MasterCoprocessorEnvironment.html#createConnection-org.apache.hadoop.conf.Configuration-"><code>createConnection(Configuration)</code></a>} to run as other than |
| the RegionServer User). |
| |
| <p>Be careful RPC'ing from a Coprocessor context. RPC's will fail, stall, retry, and/or crawl |
| because the remote side is not online, is struggling or it is on the other side of a network |
| partition. Any use of Connection from inside a Coprocessor must be able to handle all such |
| hiccups.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The host's Connection to the Cluster.</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../org/apache/hadoop/hbase/coprocessor/MasterCoprocessorEnvironment.html#createConnection-org.apache.hadoop.conf.Configuration-"><code>createConnection(Configuration)</code></a></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/MasterCoprocessorEnvironment.html#line.89">createConnection</a>(org.apache.hadoop.conf.Configuration conf) |
| throws <a href="https://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. |
| |
| Creating a Connection is a heavy-weight operation. The resultant Connection's cache of |
| region locations will be empty. Therefore you should cache and reuse Connections rather than |
| create a Connection on demand. Create on start of your Coprocessor. You will have to cast |
| the CoprocessorEnvironment appropriately to get at this API at start time because |
| Coprocessor start method is passed a subclass of this CoprocessorEnvironment or fetch |
| Connection using a synchronized accessor initializing the Connection on first access. Close |
| the returned Connection when done to free resources. Using this API rather |
| than <a href="../../../../../org/apache/hadoop/hbase/client/ConnectionFactory.html#createConnection-org.apache.hadoop.conf.Configuration-"><code>ConnectionFactory.createConnection(Configuration)</code></a> |
| returns a Connection that will short-circuit RPC if the target is a local resource. Use |
| ConnectionFactory if you don't need this ability. |
| |
| <p>Be careful RPC'ing from a Coprocessor context. RPC's will fail, stall, retry, and/or crawl |
| because the remote side is not online, is struggling or it is on the other side of a network |
| partition. Any use of Connection from inside a Coprocessor must be able to handle all such |
| hiccups.</div> |
| <dl> |
| <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="https://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="getMetricRegistryForMaster--"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>getMetricRegistryForMaster</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/MasterCoprocessorEnvironment.html#line.98">getMetricRegistryForMaster</a>()</pre> |
| <div class="block">Returns a MetricRegistry that can be used to track metrics at the master level. |
| |
| <p>See ExampleMasterObserverWithMetrics class in the hbase-examples modules for examples |
| of how metrics can be instantiated and used.</p></div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>A MetricRegistry for the coprocessor class to track and export metrics.</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| </div> |
| <!-- ========= END OF CLASS DATA ========= --> |
| <!-- ======= START OF BOTTOM NAVBAR ====== --> |
| <div class="bottomNav"><a name="navbar.bottom"> |
| <!-- --> |
| </a> |
| <div class="skipNav"><a href="#skip.navbar.bottom" title="Skip navigation links">Skip navigation links</a></div> |
| <a name="navbar.bottom.firstrow"> |
| <!-- --> |
| </a> |
| <ul class="navList" title="Navigation"> |
| <li><a href="../../../../../overview-summary.html">Overview</a></li> |
| <li><a href="package-summary.html">Package</a></li> |
| <li class="navBarCell1Rev">Class</li> |
| <li><a href="class-use/MasterCoprocessorEnvironment.html">Use</a></li> |
| <li><a href="package-tree.html">Tree</a></li> |
| <li><a href="../../../../../deprecated-list.html">Deprecated</a></li> |
| <li><a href="../../../../../index-all.html">Index</a></li> |
| <li><a href="../../../../../help-doc.html">Help</a></li> |
| </ul> |
| </div> |
| <div class="subNav"> |
| <ul class="navList"> |
| <li><a href="../../../../../org/apache/hadoop/hbase/coprocessor/MasterCoprocessor.html" title="interface in org.apache.hadoop.hbase.coprocessor"><span class="typeNameLink">Prev Class</span></a></li> |
| <li><a href="../../../../../org/apache/hadoop/hbase/coprocessor/MasterObserver.html" title="interface in org.apache.hadoop.hbase.coprocessor"><span class="typeNameLink">Next Class</span></a></li> |
| </ul> |
| <ul class="navList"> |
| <li><a href="../../../../../index.html?org/apache/hadoop/hbase/coprocessor/MasterCoprocessorEnvironment.html" target="_top">Frames</a></li> |
| <li><a href="MasterCoprocessorEnvironment.html" target="_top">No Frames</a></li> |
| </ul> |
| <ul class="navList" id="allclasses_navbar_bottom"> |
| <li><a href="../../../../../allclasses-noframe.html">All Classes</a></li> |
| </ul> |
| <div> |
| <script type="text/javascript"><!-- |
| allClassesLink = document.getElementById("allclasses_navbar_bottom"); |
| if(window==top) { |
| allClassesLink.style.display = "block"; |
| } |
| else { |
| allClassesLink.style.display = "none"; |
| } |
| //--> |
| </script> |
| </div> |
| <div> |
| <ul class="subNavList"> |
| <li>Summary: </li> |
| <li>Nested | </li> |
| <li>Field | </li> |
| <li>Constr | </li> |
| <li><a href="#method.summary">Method</a></li> |
| </ul> |
| <ul class="subNavList"> |
| <li>Detail: </li> |
| <li>Field | </li> |
| <li>Constr | </li> |
| <li><a href="#method.detail">Method</a></li> |
| </ul> |
| </div> |
| <a name="skip.navbar.bottom"> |
| <!-- --> |
| </a></div> |
| <!-- ======== END OF BOTTOM NAVBAR ======= --> |
| <p class="legalCopy"><small>Copyright © 2007–2021 <a href="https://www.apache.org/">The Apache Software Foundation</a>. All rights reserved.</small></p> |
| </body> |
| </html> |