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<div class="subTitle">com.sleepycat.je.rep.util</div>
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<h2 title="Class DbResetRepGroup" class="title">Class DbResetRepGroup</h2>
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<br>
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<pre>public class <span class="typeNameLabel">DbResetRepGroup</span>
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extends java.lang.Object</pre>
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<div class="block">A utility to reset the members of a replication group, replacing the group
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with a new group consisting of a single new member as described by the
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arguments supplied to the utility.
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<p>
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This utility is useful when a copy of an existing replicated environment
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needs to be used at a different site, with the same data, but with a
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different initial node that can be used to grow the replication group as
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usual. The utility can also be used to change the group name associated with
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the environment.
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<p>
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The reset environment has a different identity from the environment before
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the reset operation although it contains the same application data. To avoid
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confusion, the reset environment is assigned a new internal unique id. The
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unique id is checked whenever nodes attempt to communicate with each other
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and ensure that all nodes in a group are dealing with the same data.
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<p>
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The reset process is typically accomplished using the steps outlined below.
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It's good practice to back up your environment before running any utilities
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that modify an environment.
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<ol>
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<li>Use <code>DbResetRepGroup</code> to reset an existing environment.
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<code>DbResetRepGroup</code> can be used as a command line utility, and must be
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executed locally on the host specified in the -nodeHostPort argument. The
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host must also contain the environment directory.
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Alternatively, <code>DbResetRepGroup</code> may be used programmatically through
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the provided APIs.</li>
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<li>Once reset, the environment can be opened with a
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<code>ReplicatedEnvironment</code>, using the same node configuration as the one
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that was passed in to the utility. No helper host configuration is needed.
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Since the group consists of a single node, it will assume the role of a
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Master, so long as it is created as an electable node.
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<li>Additional nodes may now be created and can join the group as newly
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created replicas, as described in <code>ReplicatedEnvironment</code>. Since these
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new nodes are empty, they should be configured to use the new master as
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their helper node, and will go through the
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<a href="../../../../../../ReplicationGuide/lifecycle.html#lifecycle-nodestartup"> replication node lifecycle</a>
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to populate their environment directories. In this case, there will be data
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in the converted master that can only be transferred to the replica through
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a file copy executed with the help of a
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<a href="../../../../../com/sleepycat/je/rep/NetworkRestore.html" title="class in com.sleepycat.je.rep"><code>NetworkRestore</code></a></li>
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</ol>
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<p>
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For example:
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<pre class="code">
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// Run the utility on a copy of an existing replicated environment. Usually
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// this environment will have originated on a different node and its
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// replication group information will contain meta data referring to its
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// previous host. The utility will reset this metadata so that it has a
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// rep group (UniversalRepGroup) with a single node named nodeMars. The node
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// is associated with the machine mars and will communicate on port 5001.
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DbResetRepGroup resetUtility =
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new DbResetRepGroup(envDirMars, // env home dir
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"UniversalRepGroup", // group name
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"nodeMars", // node name
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"mars:5001"); // node host,port
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resetUtility.reset();
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// Open the reset environment; it will take on the role of master.
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ReplicatedEnvironment nodeMars = new ReplicatedEnvironment(envDirMars, ...);
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...
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// Bring up additional nodes, which will be initialized from
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// nodeMars. For example, from the machine venus you can now add a new
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// member to the group(UniversalRepGroup) as below.
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ReplicationConfig repConfig = null;
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try {
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repConfig = new ReplicationConfig("UniversalRepGroup", // groupName
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"nodeVenus", // nodeName
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"venus:5008"); // nodeHostPort
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repConfig.setHelperHosts("mars:5001");
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nodeVenus = new ReplicatedEnvironment(envDirB, repConfig, envConfig);
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} catch (InsufficientLogException insufficientLogEx) {
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// log files will be copied from another node in the group
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NetworkRestore restore = new NetworkRestore();
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restore.execute(insufficientLogEx, new NetworkRestoreConfig());
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// try opening the node now that the environment files have been
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// restored on this machine.
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nodeVenus = new ReplicatedEnvironment(envDirVenus,
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repConfig,
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envConfig);
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}
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...
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</pre></div>
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</li>
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<h3>Constructor Summary</h3>
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<tr class="altColor">
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../com/sleepycat/je/rep/util/DbResetRepGroup.html#DbResetRepGroup-java.io.File-java.lang.String-java.lang.String-java.lang.String-">DbResetRepGroup</a></span>(java.io.File envHome,
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java.lang.String groupName,
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java.lang.String nodeName,
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java.lang.String nodeHostPort)</code>
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<div class="block">Create a DbResetRepGroup object for this node.</div>
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</td>
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</tr>
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</table>
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<tr>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colLast" scope="col">Method and Description</th>
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<tr id="i0" class="altColor">
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<td class="colFirst"><code>static void</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/sleepycat/je/rep/util/DbResetRepGroup.html#main-java.lang.String:A-">main</a></span>(java.lang.String[] args)</code>
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<div class="block">Usage:</div>
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</td>
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</tr>
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<tr id="i1" class="rowColor">
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<td class="colFirst"><code>void</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/sleepycat/je/rep/util/DbResetRepGroup.html#reset--">reset</a></span>()</code>
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<div class="block">Replaces the existing group with the new group having a single new node
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as described by the constructor arguments.</div>
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</td>
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</tr>
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</table>
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<h3>Methods inherited from class java.lang.Object</h3>
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<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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</ul>
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</li>
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</ul>
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</li>
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</ul>
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</div>
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<div class="details">
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<!-- ========= CONSTRUCTOR DETAIL ======== -->
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<ul class="blockList">
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<li class="blockList"><a name="constructor.detail">
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<!-- -->
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</a>
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<h3>Constructor Detail</h3>
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<a name="DbResetRepGroup-java.io.File-java.lang.String-java.lang.String-java.lang.String-">
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<!-- -->
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</a>
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<li class="blockList">
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<h4>DbResetRepGroup</h4>
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<pre>public DbResetRepGroup(java.io.File envHome,
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java.lang.String groupName,
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java.lang.String nodeName,
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java.lang.String nodeHostPort)</pre>
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<div class="block">Create a DbResetRepGroup object for this node.</div>
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<dl>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>envHome</code> - The node's replicated environment directory. The
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directory must be accessible on this host.</dd>
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<dd><code>groupName</code> - The name of the new replication group</dd>
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<dd><code>nodeName</code> - The node's name</dd>
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<dd><code>nodeHostPort</code> - The host and port for this node. The utility
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must be executed on this host.</dd>
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</dl>
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</li>
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</ul>
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</li>
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</ul>
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<!-- ============ METHOD DETAIL ========== -->
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<ul class="blockList">
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<li class="blockList"><a name="method.detail">
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<!-- -->
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</a>
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<h3>Method Detail</h3>
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<a name="main-java.lang.String:A-">
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<!-- -->
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</a>
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<ul class="blockList">
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<h4>main</h4>
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<pre>public static void main(java.lang.String[] args)</pre>
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<div class="block">Usage:
|
||
|
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<pre>
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||
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java -cp je.jar com.sleepycat.je.rep.util.DbResetRepGroup
|
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-h <dir> # environment home directory
|
||
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-groupName <group name> # replication group name
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||
|
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-nodeName <node name> # replicated node name
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||
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-nodeHostPort <host name:port number> # host name or IP address
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and port number to use
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|
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for this node
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