mirror of
https://github.com/berkeleydb/je.git
synced 2024-11-15 01:46:24 +00:00
473 lines
21 KiB
HTML
473 lines
21 KiB
HTML
|
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
|
|||
|
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|||
|
|
<html xmlns="http://www.w3.org/1999/xhtml">
|
|||
|
|
<head>
|
|||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
|
|||
|
|
<title>Chapter 4. Utilities</title>
|
|||
|
|
<link rel="stylesheet" href="gettingStarted.css" type="text/css" />
|
|||
|
|
<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
|
|||
|
|
<link rel="start" href="index.html" title="Getting Started with Berkeley DB, Java Edition High Availability Applications" />
|
|||
|
|
<link rel="up" href="index.html" title="Getting Started with Berkeley DB, Java Edition High Availability Applications" />
|
|||
|
|
<link rel="prev" href="runtransaction.html" title="Example Run Transaction Class" />
|
|||
|
|
<link rel="next" href="logfile-restore.html" title="Restoring Log Files" />
|
|||
|
|
</head>
|
|||
|
|
<body>
|
|||
|
|
<div xmlns="" class="navheader">
|
|||
|
|
<div class="libver">
|
|||
|
|
<p>Library Version 12.2.7.5</p>
|
|||
|
|
</div>
|
|||
|
|
<table width="100%" summary="Navigation header">
|
|||
|
|
<tr>
|
|||
|
|
<th colspan="3" align="center">Chapter 4. Utilities</th>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td width="20%" align="left"><a accesskey="p" href="runtransaction.html">Prev</a> </td>
|
|||
|
|
<th width="60%" align="center"> </th>
|
|||
|
|
<td width="20%" align="right"> <a accesskey="n" href="logfile-restore.html">Next</a></td>
|
|||
|
|
</tr>
|
|||
|
|
</table>
|
|||
|
|
<hr />
|
|||
|
|
</div>
|
|||
|
|
<div class="chapter" lang="en" xml:lang="en">
|
|||
|
|
<div class="titlepage">
|
|||
|
|
<div>
|
|||
|
|
<div>
|
|||
|
|
<h2 class="title"><a id="utilities"></a>Chapter 4. Utilities</h2>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
<div class="toc">
|
|||
|
|
<p>
|
|||
|
|
<b>Table of Contents</b>
|
|||
|
|
</p>
|
|||
|
|
<dl>
|
|||
|
|
<dt>
|
|||
|
|
<span class="sect1">
|
|||
|
|
<a href="utilities.html#groupadmin">Administering the Replication Group</a>
|
|||
|
|
</span>
|
|||
|
|
</dt>
|
|||
|
|
<dd>
|
|||
|
|
<dl>
|
|||
|
|
<dt>
|
|||
|
|
<span class="sect2">
|
|||
|
|
<a href="utilities.html#listmembers">Listing Group Members</a>
|
|||
|
|
</span>
|
|||
|
|
</dt>
|
|||
|
|
<dt>
|
|||
|
|
<span class="sect2">
|
|||
|
|
<a href="utilities.html#locate-master">Locating the Current Master</a>
|
|||
|
|
</span>
|
|||
|
|
</dt>
|
|||
|
|
<dt>
|
|||
|
|
<span class="sect2">
|
|||
|
|
<a href="utilities.html#node-addremove">Adding and Removing Nodes from the Group</a>
|
|||
|
|
</span>
|
|||
|
|
</dt>
|
|||
|
|
</dl>
|
|||
|
|
</dd>
|
|||
|
|
<dt>
|
|||
|
|
<span class="sect1">
|
|||
|
|
<a href="logfile-restore.html">Restoring Log Files</a>
|
|||
|
|
</span>
|
|||
|
|
</dt>
|
|||
|
|
<dd>
|
|||
|
|
<dl>
|
|||
|
|
<dt>
|
|||
|
|
<span class="sect2">
|
|||
|
|
<a href="logfile-restore.html#logfilereclaim">Reclaiming Log Files</a>
|
|||
|
|
</span>
|
|||
|
|
</dt>
|
|||
|
|
<dt>
|
|||
|
|
<span class="sect2">
|
|||
|
|
<a href="logfile-restore.html#repdiskthresh">Suspending Writes Due to Disk Thresholds</a>
|
|||
|
|
</span>
|
|||
|
|
</dt>
|
|||
|
|
</dl>
|
|||
|
|
</dd>
|
|||
|
|
<dt>
|
|||
|
|
<span class="sect1">
|
|||
|
|
<a href="dbbackup.html">Backing up a Replicated Application</a>
|
|||
|
|
</span>
|
|||
|
|
</dt>
|
|||
|
|
<dt>
|
|||
|
|
<span class="sect1">
|
|||
|
|
<a href="enablerep.html">Converting Existing Environments for Replication</a>
|
|||
|
|
</span>
|
|||
|
|
</dt>
|
|||
|
|
</dl>
|
|||
|
|
</div>
|
|||
|
|
<p>
|
|||
|
|
This chapter discusses the APIs that you use to administer and
|
|||
|
|
manage your replication group.
|
|||
|
|
</p>
|
|||
|
|
<div class="sect1" lang="en" xml:lang="en">
|
|||
|
|
<div class="titlepage">
|
|||
|
|
<div>
|
|||
|
|
<div>
|
|||
|
|
<h2 class="title" style="clear: both"><a id="groupadmin"></a>Administering the Replication Group</h2>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
<div class="toc">
|
|||
|
|
<dl>
|
|||
|
|
<dt>
|
|||
|
|
<span class="sect2">
|
|||
|
|
<a href="utilities.html#listmembers">Listing Group Members</a>
|
|||
|
|
</span>
|
|||
|
|
</dt>
|
|||
|
|
<dt>
|
|||
|
|
<span class="sect2">
|
|||
|
|
<a href="utilities.html#locate-master">Locating the Current Master</a>
|
|||
|
|
</span>
|
|||
|
|
</dt>
|
|||
|
|
<dt>
|
|||
|
|
<span class="sect2">
|
|||
|
|
<a href="utilities.html#node-addremove">Adding and Removing Nodes from the Group</a>
|
|||
|
|
</span>
|
|||
|
|
</dt>
|
|||
|
|
</dl>
|
|||
|
|
</div>
|
|||
|
|
<p>
|
|||
|
|
There are a series of administrative activities that an
|
|||
|
|
application might want to take relative to a replication group.
|
|||
|
|
These activities can be performed by electable or secondary nodes in the
|
|||
|
|
replication group, or by applications that do not have access to
|
|||
|
|
a replicated environment (in other words, utilities designed to
|
|||
|
|
help administer and monitor the group). All of these functions
|
|||
|
|
can be accessed using the <a class="ulink" href="../java/com/sleepycat/je/rep/util/ReplicationGroupAdmin.html" target="_top">ReplicationGroupAdmin</a> class.
|
|||
|
|
</p>
|
|||
|
|
<p>
|
|||
|
|
You can use the <a class="ulink" href="../java/com/sleepycat/je/rep/util/ReplicationGroupAdmin.html" target="_top">ReplicationGroupAdmin</a> class to:
|
|||
|
|
</p>
|
|||
|
|
<div class="orderedlist">
|
|||
|
|
<ol type="1">
|
|||
|
|
<li>
|
|||
|
|
<p>
|
|||
|
|
List replication group members.
|
|||
|
|
</p>
|
|||
|
|
</li>
|
|||
|
|
<li>
|
|||
|
|
<p>
|
|||
|
|
Locate the current Master.
|
|||
|
|
</p>
|
|||
|
|
</li>
|
|||
|
|
<li>
|
|||
|
|
<p>
|
|||
|
|
Remove electable nodes from the replication group.
|
|||
|
|
</p>
|
|||
|
|
</li>
|
|||
|
|
</ol>
|
|||
|
|
</div>
|
|||
|
|
<p>
|
|||
|
|
You instantiate an instance of the <a class="ulink" href="../java/com/sleepycat/je/rep/util/ReplicationGroupAdmin.html" target="_top">ReplicationGroupAdmin</a>
|
|||
|
|
class by providing it with the name of the replication group
|
|||
|
|
that you want to administer, as well as a <a class="ulink" href="http://java.sun.com/j2se/1.5/docs/api/java/util/Set.html" target="_top">Set</a> of
|
|||
|
|
<a class="ulink" href="http://java.sun.com/j2se/1.5/docs/api/java/net/InetSocketAddress.html" target="_top">InetSocketAddress</a> objects. The <a class="ulink" href="http://java.sun.com/j2se/1.5/docs/api/java/net/InetSocketAddress.html" target="_top">InetSocketAddress</a> objects
|
|||
|
|
are used as a list of helper hosts that the application can use
|
|||
|
|
to perform administrative functions. For example:
|
|||
|
|
</p>
|
|||
|
|
<pre class="programlisting">...
|
|||
|
|
|
|||
|
|
Set<InetSocketAddress> helpers =
|
|||
|
|
new HashSet<InetSocketAddress>();
|
|||
|
|
InetSocketAddress helper1 =
|
|||
|
|
new InetSocketAddress("node1.example.com", 1550);
|
|||
|
|
InetSocketAddress helper2 =
|
|||
|
|
new InetSocketAddress("node2.example.com", 1550);
|
|||
|
|
|
|||
|
|
helpers.add(helper1);
|
|||
|
|
helpers.add(helper2);
|
|||
|
|
|
|||
|
|
ReplicationGroupAdmin rga =
|
|||
|
|
new ReplicationGroupAdmin("test_rep_group", helpers); </pre>
|
|||
|
|
<div class="sect2" lang="en" xml:lang="en">
|
|||
|
|
<div class="titlepage">
|
|||
|
|
<div>
|
|||
|
|
<div>
|
|||
|
|
<h3 class="title"><a id="listmembers"></a>Listing Group Members</h3>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
<p>
|
|||
|
|
To list all the members of a replication group, use the
|
|||
|
|
<a class="ulink" href="../java/com/sleepycat/je/rep/util/ReplicationGroupAdmin.html#getGroup()" target="_top">ReplicationGroupAdmin.getGroup()</a> method. This returns an
|
|||
|
|
instance of <a class="ulink" href="../java/com/sleepycat/je/rep/ReplicationGroup.html" target="_top">ReplicationGroup</a>. You then can then:
|
|||
|
|
</p>
|
|||
|
|
<div class="orderedlist">
|
|||
|
|
<ol type="1">
|
|||
|
|
<li>
|
|||
|
|
<p>
|
|||
|
|
use the <a class="ulink" href="../java/com/sleepycat/je/rep/ReplicationGroup.html#getNodes()" target="_top">ReplicationGroup.getNodes()</a> method to locate
|
|||
|
|
all the nodes in the replication group.
|
|||
|
|
</p>
|
|||
|
|
</li>
|
|||
|
|
<li>
|
|||
|
|
<p>
|
|||
|
|
use the <a class="ulink" href="../java/com/sleepycat/je/rep/ReplicationGroup.html#getElectableNodes()" target="_top">ReplicationGroup.getElectableNodes()</a> method to locate all
|
|||
|
|
the electable nodes in the replication group.
|
|||
|
|
</p>
|
|||
|
|
</li>
|
|||
|
|
<li>
|
|||
|
|
<p>
|
|||
|
|
use the <a class="ulink" href="../java/com/sleepycat/je/rep/ReplicationGroup.html#getSecondaryNodes()" target="_top">ReplicationGroup.getSecondaryNodes()</a>
|
|||
|
|
method to locate all the secondary nodes in the
|
|||
|
|
replication group.
|
|||
|
|
</p>
|
|||
|
|
</li>
|
|||
|
|
<li>
|
|||
|
|
<p>
|
|||
|
|
use <a class="ulink" href="../java/com/sleepycat/je/rep/ReplicationGroup.html#getMonitorNodes()" target="_top">ReplicationGroup.getMonitorNodes()</a> to locate all the
|
|||
|
|
monitor nodes that currently belong to the replication
|
|||
|
|
group.
|
|||
|
|
</p>
|
|||
|
|
</li>
|
|||
|
|
</ol>
|
|||
|
|
</div>
|
|||
|
|
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
|
|||
|
|
<h3 class="title">Note</h3>
|
|||
|
|
<p>
|
|||
|
|
In order to obtain a <a class="ulink" href="../java/com/sleepycat/je/rep/ReplicationGroup.html" target="_top">ReplicationGroup</a> object,
|
|||
|
|
the process must be able to discover the current
|
|||
|
|
Master. This means that the helper nodes you provide
|
|||
|
|
when you instantiate the <a class="ulink" href="../java/com/sleepycat/je/rep/util/ReplicationGroupAdmin.html" target="_top">ReplicationGroupAdmin</a> class
|
|||
|
|
must be reachable and able to identify the current
|
|||
|
|
Master. If they cannot, then these methods throw an
|
|||
|
|
<a class="ulink" href="../java/com/sleepycat/je/rep/UnknownMasterException.html" target="_top">UnknownMasterException</a>.
|
|||
|
|
</p>
|
|||
|
|
</div>
|
|||
|
|
<p>
|
|||
|
|
All of these methods return a set of <a class="ulink" href="../java/com/sleepycat/je/rep/ReplicationNode.html" target="_top">ReplicationNode</a> objects, which
|
|||
|
|
you can then use to query for node information, such as its
|
|||
|
|
name, the <a class="ulink" href="http://java.sun.com/j2se/1.5/docs/api/java/net/InetSocketAddress.html" target="_top">InetSocketAddress</a> where the node is located,
|
|||
|
|
and the node's type.
|
|||
|
|
</p>
|
|||
|
|
<p>
|
|||
|
|
For example:
|
|||
|
|
</p>
|
|||
|
|
<pre class="programlisting">...
|
|||
|
|
|
|||
|
|
Set<InetSocketAddress> helpers =
|
|||
|
|
new HashSet<InetSocketAddress>();
|
|||
|
|
InetSocketAddress helper1 =
|
|||
|
|
new InetSocketAddress("node1.example.com", 1550);
|
|||
|
|
InetSocketAddress helper2 =
|
|||
|
|
new InetSocketAddress("node2.example.com", 1550);
|
|||
|
|
|
|||
|
|
helpers.add(helper1);
|
|||
|
|
helpers.add(helper2);
|
|||
|
|
|
|||
|
|
ReplicationGroupAdmin rga =
|
|||
|
|
new ReplicationGroupAdmin("test_rep_group", helpers);
|
|||
|
|
|
|||
|
|
try {
|
|||
|
|
ReplicationGroup rg = rga.getGroup();
|
|||
|
|
for (ReplicationNode rn : rg.getElectableNodes()) {
|
|||
|
|
// Do something with the replication node.
|
|||
|
|
}
|
|||
|
|
} catch (UnknownMasterException ume) {
|
|||
|
|
// Can't find a master
|
|||
|
|
} </pre>
|
|||
|
|
</div>
|
|||
|
|
<div class="sect2" lang="en" xml:lang="en">
|
|||
|
|
<div class="titlepage">
|
|||
|
|
<div>
|
|||
|
|
<div>
|
|||
|
|
<h3 class="title"><a id="locate-master"></a>Locating the Current Master</h3>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
<p>
|
|||
|
|
You can use the <a class="ulink" href="../java/com/sleepycat/je/rep/util/ReplicationGroupAdmin.html" target="_top">ReplicationGroupAdmin</a> class to locate the
|
|||
|
|
current Master in the replication group. This information
|
|||
|
|
is available using the
|
|||
|
|
<a class="ulink" href="../java/com/sleepycat/je/rep/util/ReplicationGroupAdmin.html#getMasterNodeName()" target="_top">ReplicationGroupAdmin.getMasterNodeName()</a> and
|
|||
|
|
<a class="ulink" href="../java/com/sleepycat/je/rep/util/ReplicationGroupAdmin.html#getMasterSocket()" target="_top">ReplicationGroupAdmin.getMasterSocket()</a> methods.
|
|||
|
|
</p>
|
|||
|
|
<p>
|
|||
|
|
<a class="ulink" href="../java/com/sleepycat/je/rep/util/ReplicationGroupAdmin.html#getMasterNodeName()" target="_top">ReplicationGroupAdmin.getMasterNodeName()</a> returns a string
|
|||
|
|
that holds the node name associated with the Master.
|
|||
|
|
</p>
|
|||
|
|
<p>
|
|||
|
|
<a class="ulink" href="../java/com/sleepycat/je/rep/util/ReplicationGroupAdmin.html#getMasterSocket()" target="_top">ReplicationGroupAdmin.getMasterSocket()</a> returns an
|
|||
|
|
<a class="ulink" href="http://java.sun.com/j2se/1.5/docs/api/java/net/InetSocketAddress.html" target="_top">InetSocketAddress</a> class object that represents the host
|
|||
|
|
and port where the Master can currently be found.
|
|||
|
|
</p>
|
|||
|
|
<p>
|
|||
|
|
Both methods will throw an <a class="ulink" href="../java/com/sleepycat/je/rep/UnknownMasterException.html" target="_top">UnknownMasterException</a> if the
|
|||
|
|
helper nodes are not able to identify the current Master.
|
|||
|
|
</p>
|
|||
|
|
<p>
|
|||
|
|
For example:
|
|||
|
|
</p>
|
|||
|
|
<pre class="programlisting">import java.net.InetSocketAddress;
|
|||
|
|
import java.util.HashSet;
|
|||
|
|
import java.util.Set;
|
|||
|
|
|
|||
|
|
import com.sleepycat.je.rep.UnknownMasterException;
|
|||
|
|
import com.sleepycat.je.rep.util.ReplicationGroupAdmin;
|
|||
|
|
|
|||
|
|
...
|
|||
|
|
|
|||
|
|
Set<InetSocketAddress> helpers =
|
|||
|
|
new HashSet<InetSocketAddress>();
|
|||
|
|
InetSocketAddress helper1 =
|
|||
|
|
new InetSocketAddress("node1.example.com", 1550);
|
|||
|
|
InetSocketAddress helper2 =
|
|||
|
|
new InetSocketAddress("node2.example.com", 1550);
|
|||
|
|
|
|||
|
|
helpers.add(helper1);
|
|||
|
|
helpers.add(helper2);
|
|||
|
|
|
|||
|
|
ReplicationGroupAdmin rga =
|
|||
|
|
new ReplicationGroupAdmin("test_rep_group", helpers);
|
|||
|
|
|
|||
|
|
try {
|
|||
|
|
InetSocketAddress master = rga.getMasterSocket();
|
|||
|
|
System.out.println("Master is on host " +
|
|||
|
|
master.getHostName() + " at port " +
|
|||
|
|
master.getPort());
|
|||
|
|
}
|
|||
|
|
} catch (UnknownMasterException ume) {
|
|||
|
|
// Can't find a master
|
|||
|
|
} </pre>
|
|||
|
|
</div>
|
|||
|
|
<div class="sect2" lang="en" xml:lang="en">
|
|||
|
|
<div class="titlepage">
|
|||
|
|
<div>
|
|||
|
|
<div>
|
|||
|
|
<h3 class="title"><a id="node-addremove"></a>Adding and Removing Nodes from the Group</h3>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
<p>
|
|||
|
|
In order to add nodes to a replication group, you simply
|
|||
|
|
start up a node and identify at least one helper node that
|
|||
|
|
can identify the current Master to the new node. After the
|
|||
|
|
new node has been populated with a current enough copy of
|
|||
|
|
the data contained on the Master, the new node is
|
|||
|
|
automatically a member of the replication group.
|
|||
|
|
</p>
|
|||
|
|
<p>
|
|||
|
|
An electable node's status as a member of the group is persistent.
|
|||
|
|
That is, it is a member of the group regardless of whether
|
|||
|
|
it is running, and whether other nodes in the group can
|
|||
|
|
reach it over the network. This means that for the purposes
|
|||
|
|
of elections and message acknowledgements, the node counts
|
|||
|
|
toward the total number of nodes that must respond and/or
|
|||
|
|
participate in an event.
|
|||
|
|
</p>
|
|||
|
|
<p>
|
|||
|
|
If, for example, you are using a durability guarantee that
|
|||
|
|
requires all electable nodes in the replication group to acknowledge
|
|||
|
|
a transaction commit on the Master, and if a node is down
|
|||
|
|
or otherwise unavailable for some reason, then the commit
|
|||
|
|
cannot complete on the Master because it will not receive
|
|||
|
|
acknowledgements from all the electable nodes in the replication
|
|||
|
|
group.
|
|||
|
|
</p>
|
|||
|
|
<p>
|
|||
|
|
Similarly, elections for Masters require a bare majority of
|
|||
|
|
electable nodes to participate in the election. If so many nodes are
|
|||
|
|
shutdown or unavailable due to a network partition event
|
|||
|
|
that a bare majority of electable nodes cannot be found to hold the
|
|||
|
|
election, then your replication group can perform no write
|
|||
|
|
activities. This situation persists until at least enough
|
|||
|
|
nodes come back online to represent a bare majority of the
|
|||
|
|
electable nodes belonging to the replication group.
|
|||
|
|
</p>
|
|||
|
|
<p>
|
|||
|
|
For this reason, if you have an electable node that you intend to
|
|||
|
|
shutdown for a long time, then you should remove that node
|
|||
|
|
from the replication group. You do this using the
|
|||
|
|
<a class="ulink" href="../java/com/sleepycat/je/rep/util/ReplicationGroupAdmin.html#removeMember(java.lang.String)" target="_top">ReplicationGroupAdmin.removeMember()</a> method. Note the
|
|||
|
|
following rules when using this method:
|
|||
|
|
</p>
|
|||
|
|
<div class="itemizedlist">
|
|||
|
|
<ul type="disc">
|
|||
|
|
<li>
|
|||
|
|
<p>
|
|||
|
|
For best results, shutdown the node before removing
|
|||
|
|
it.
|
|||
|
|
</p>
|
|||
|
|
</li>
|
|||
|
|
<li>
|
|||
|
|
<p>
|
|||
|
|
You use the node's name (not the host/port pair) to identify the node
|
|||
|
|
you want to remove from the group. If the node name
|
|||
|
|
that you specify is unknown to the replication
|
|||
|
|
group, a <a class="ulink" href="../java/com/sleepycat/je/rep/MemberNotFoundException.html" target="_top">MemberNotFoundException</a> is thrown. If
|
|||
|
|
it names a secondary node, an
|
|||
|
|
<a class="ulink" href="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/IllegalArgumentException.html" target="_top">IllegalArgumentException</a> is thrown.
|
|||
|
|
</p>
|
|||
|
|
</li>
|
|||
|
|
<li>
|
|||
|
|
<p>
|
|||
|
|
Once removed, the electable node can no longer connect to the
|
|||
|
|
Master, nor can it participate in elections. If
|
|||
|
|
you want to reconnect the node to the Master (that
|
|||
|
|
is, you want to add it back to the replication group), you
|
|||
|
|
will have to do so using a different node name than
|
|||
|
|
the node was using when it was removed from the
|
|||
|
|
group.
|
|||
|
|
</p>
|
|||
|
|
</li>
|
|||
|
|
<li>
|
|||
|
|
<p>
|
|||
|
|
An active Master cannot be removed from the group. To
|
|||
|
|
remove the active Master, either shut it down or wait
|
|||
|
|
until it transitions to the Replica state.
|
|||
|
|
If you attempt to remove an active Master, a
|
|||
|
|
<a class="ulink" href="../java/com/sleepycat/je/rep/MasterStateException.html" target="_top">MasterStateException</a> is thrown.
|
|||
|
|
</p>
|
|||
|
|
</li>
|
|||
|
|
</ul>
|
|||
|
|
</div>
|
|||
|
|
<p>
|
|||
|
|
For example:
|
|||
|
|
</p>
|
|||
|
|
<pre class="programlisting">...
|
|||
|
|
|
|||
|
|
Set<InetSocketAddress> helpers =
|
|||
|
|
new HashSet<InetSocketAddress>();
|
|||
|
|
InetSocketAddress helper1 =
|
|||
|
|
new InetSocketAddress("node1.example.com", 1550);
|
|||
|
|
InetSocketAddress helper2 =
|
|||
|
|
new InetSocketAddress("node2.example.com", 1550);
|
|||
|
|
|
|||
|
|
helpers.add(helper1);
|
|||
|
|
helpers.add(helper2);
|
|||
|
|
|
|||
|
|
ReplicationGroupAdmin rga =
|
|||
|
|
new ReplicationGroupAdmin("test_rep_group", helpers);
|
|||
|
|
|
|||
|
|
try {
|
|||
|
|
rga.removeMember("NODE3");
|
|||
|
|
} catch (MemberNotFoundException mnfe) {
|
|||
|
|
// Specified a node name that is not known to the
|
|||
|
|
// replication group.
|
|||
|
|
} catch (MasterStateException mse) {
|
|||
|
|
// Tried to remove an active Master
|
|||
|
|
} </pre>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
<div class="navfooter">
|
|||
|
|
<hr />
|
|||
|
|
<table width="100%" summary="Navigation footer">
|
|||
|
|
<tr>
|
|||
|
|
<td width="40%" align="left"><a accesskey="p" href="runtransaction.html">Prev</a> </td>
|
|||
|
|
<td width="20%" align="center"> </td>
|
|||
|
|
<td width="40%" align="right"> <a accesskey="n" href="logfile-restore.html">Next</a></td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td width="40%" align="left" valign="top">Example Run Transaction Class </td>
|
|||
|
|
<td width="20%" align="center">
|
|||
|
|
<a accesskey="h" href="index.html">Home</a>
|
|||
|
|
</td>
|
|||
|
|
<td width="40%" align="right" valign="top"> Restoring Log Files</td>
|
|||
|
|
</tr>
|
|||
|
|
</table>
|
|||
|
|
</div>
|
|||
|
|
</body>
|
|||
|
|
</html>
|