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Replication Methods
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<div class="sect1" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h2 class="title" style="clear: both"><a id="repset_timeout"></a>DB_ENV->rep_set_timeout()</h2>
</div>
</div>
</div>
<pre class="programlisting">#include <db.h>
int
DB_ENV->rep_set_timeout(DB_ENV *env, int which, u_int32_t timeout); </pre>
<p>
The <code class="methodname">DB_ENV->rep_set_timeout()</code> method
specifies a variety of replication timeout values.
</p>
<p>
The database environment's replication subsystem may also be
configured using the environment's <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file. The syntax
of the entry in that file is a single line with the string
"rep_set_timeout", one or more whitespace characters, and the
<span class="bold"><strong>which</strong></span> parameter specified as a
string and the timeout. For example,
"rep_set_timeout DB_REP_CONNECTION_RETRY 15000000" specifies the
connection retry timeout for 15 seconds. Because the <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a>
file is read when the database environment is opened, it will
silently overrule configuration done before that time.
</p>
<p>
The <code class="methodname">DB_ENV->rep_set_timeout()</code> method
configures a database environment, not only operations performed
using the specified <a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a>
handle.
</p>
<p>
The <code class="methodname">DB_ENV->rep_set_timeout()</code> method may not be
called to set the master lease timeout after the
<a class="xref" href="repmgrstart.html" title="DB_ENV->repmgr_start()">DB_ENV->repmgr_start()</a> method or the
<a class="xref" href="repstart.html" title="DB_ENV->rep_start()">DB_ENV->rep_start()</a>
method is called. For all other timeouts, the
<code class="methodname">DB_ENV->rep_set_timeout()</code>
method may be called at any time during the life of the application.
</p>
<p>
The <code class="methodname">DB_ENV->rep_set_timeout()</code> <span>
<span>
method returns a non-zero error value on failure and 0 on success.
</span>
</span>
</p>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp3858760"></a>Parameters</h3>
</div>
</div>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp3859232"></a>which</h4>
</div>
</div>
</div>
<p>
The <span class="bold"><strong>which</strong></span> parameter must
be set to one of the following values:
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p><a id="set_timeout_DB_REP_ACK_TIMEOUT"></a>
<code class="literal">DB_REP_ACK_TIMEOUT</code>
</p>
<p>
Configure the amount of time the Replication
Manager's transport function waits to collect
enough acknowledgments from replication group
clients, before giving up and returning a failure
indication. The default wait time is 1 second.
Automatic takeover of a subordinate process is most
reliable when this value is the same on all sites in
the replication group.
</p>
</li>
<li>
<p>
<code class="literal">DB_REP_CHECKPOINT_DELAY</code>
</p>
<p>
Configure the amount of time a master site will
delay between completing a checkpoint and writing
a checkpoint record into the log. This delay
allows clients to complete their own checkpoints
before the master requires completion of them.
The default is 30 seconds. If all databases in the
environment, and the environment's transaction
log, are configured to reside in memory (never
preserved to disk), then, although checkpoints are
still necessary, the delay is not useful and
should be set to 0.
</p>
</li>
<li>
<p>
<code class="literal">DB_REP_CONNECTION_RETRY</code>
</p>
<p>
Configure the amount of time the Replication
Manager will wait before trying to re-establish a
connection to another site after a communication
failure. The default wait time is 30 seconds.
</p>
</li>
<li>
<p>
<code class="literal">DB_REP_ELECTION_TIMEOUT</code>
</p>
<p>
The timeout period for an election. The default
timeout is 2 seconds.
</p>
</li>
<li>
<p><a id="set_timeout_DB_REP_ELECTION_RETRY"></a>
<code class="literal">DB_REP_ELECTION_RETRY</code>
</p>
<p>
Configure the amount of time the Replication
Manager will wait before retrying a failed
election. The default wait time is 10 seconds.
In preferred master mode, a shorter wait time is
recommended to facilitate automatic takeovers,
so the default wait time is reduced to 1 second.
</p>
</li>
<li>
<p><a id="set_timeout_DB_REP_FULL_ELECTION_TIMEOUT"></a>
<code class="literal">DB_REP_FULL_ELECTION_TIMEOUT</code>
</p>
<p>
An optional configuration timeout period to wait
for full election participation the first time the
replication group finds a master. By default this
option is turned off and normal election timeouts
are used. (See the
<a href="../../programmer_reference/rep_elect.html" class="olink">Elections</a>
section in the <em class="citetitle">Berkeley DB Programmer's Reference Guide</em>
for more information.)
</p>
</li>
<li>
<p><a id="set_timeout_DB_REP_HEARTBEAT_MONITOR"></a>
<code class="literal">DB_REP_HEARTBEAT_MONITOR</code>
</p>
<p>
The amount of time the Replication Manager,
running at a client site, waits for some message
activity on the connection from the master
(heartbeats or other messages) before concluding
that the connection has been lost. This timeout
should be of longer duration than the
<code class="literal">DB_REP_HEARTBEAT_SEND</code> timeout
to ensure that heartbeats are not missed. When 0
(the default), no monitoring is performed. In
preferred master mode the default is 2 seconds and
heartbeat monitoring cannot be turned off because
heartbeats are required for automatic takeovers.
</p>
</li>
<li>
<p><a id="set_timeout_DB_REP_HEARTBEAT_SEND"></a>
<code class="literal">DB_REP_HEARTBEAT_SEND</code>
</p>
<p>
The frequency at which the Replication Manager,
running at a master site, broadcasts a heartbeat
message in an otherwise idle system. Heartbeat
messages are used at client sites to monitor the
connection to the master and to help request missing
master changes in the absence of master activity.
When 0 (the default), no heartbeat messages will be
sent. In preferred master mode the default is 0.75
second and heartbeats cannot be turned off because
they are required for automatic takeovers.
</p>
</li>
<li>
<p>
<code class="literal">DB_REP_LEASE_TIMEOUT</code>
</p>
<p>
Configure the amount of time a client grants its
master lease to a master. When using master
leases all sites in a replication group must use
the same lease timeout value. There is no default
value. If leases are desired, this method must be
called prior to calling the
<a class="xref" href="repmgrstart.html" title="DB_ENV->repmgr_start()">DB_ENV->repmgr_start()</a>
method or the
<a class="xref" href="repstart.html" title="DB_ENV->rep_start()">DB_ENV->rep_start()</a>
method.
See also <a class="xref" href="repclockskew.html" title="DB_ENV->rep_set_clockskew()">DB_ENV->rep_set_clockskew()</a>
method, <a class="xref" href="repconfig.html" title="DB_ENV->rep_set_config()">DB_ENV->rep_set_config()</a>
method and <a href="../../programmer_reference/rep_lease.html" class="olink">Master leases</a>.
</p>
</li>
</ul>
</div>
</div>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp3892112"></a>timeout</h4>
</div>
</div>
</div>
<p>
The <span class="bold"><strong>timeout</strong></span> parameter is the timeout value. It
must be specified as an unsigned 32-bit number of microseconds, limiting the
maximum timeout to roughly 71 minutes.
</p>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp3866208"></a>Errors</h3>
</div>
</div>
</div>
<p>
The <code class="methodname">DB_ENV->rep_set_timeout()</code> <span>
<span>
method may fail and return one of the following non-zero errors:
</span>
</span>
</p>
<div class="sect3" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="idp3873976"></a>EINVAL</h4>
</div>
</div>
</div>
<p>
If setting the lease timeout and replication has already been
started; if turning off a heartbeat timeout in Replication
Manager preferred master mode; if setting a Replication
Manager timeout for a Base API application;
or if an invalid flag value or parameter was specified.
</p>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp3872896"></a>Class</h3>
</div>
</div>
</div>
<p>
<a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a>
</p>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp3875056"></a>See Also</h3>
</div>
</div>
</div>
<p>
<a class="xref" href="rep.html#replist" title="Replication and Related Methods">Replication and Related Methods</a>
</p>
</div>
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