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Error codes available since Redis 2.8.

=over

=item E_NO_AUTH

Authentication required.

=item E_WRONG_TYPE

Operation against a key holding the wrong kind of value.

=item E_NO_REPLICAS

Not enough good slaves to write.

=item E_BUSY_KEY

Target key name already exists.

=back

Error codes available since Redis 3.0.

=over

=item E_CROSS_SLOT

Keys in request don't hash to the same slot.

=item E_TRY_AGAIN

Multiple keys request during rehashing of slot.

=item E_ASK

Redirection required. For more information see:
L<http://redis.io/topics/cluster-spec>

=item E_MOVED

Redirection required. For more information see:
L<http://redis.io/topics/cluster-spec>

=item E_CLUSTER_DOWN

The cluster is down or hash slot not served.

=back

=head1 DISCONNECTION

When the connection to the server is no longer needed you can close it in three
ways: call the method C<disconnect()>, send the C<QUIT> command or you can just
"forget" any references to an AnyEvent::RipeRedis object, but in this
case the client object is destroyed without calling any callbacks, including
the C<on_disconnect> callback, to avoid an unexpected behavior.

=head2 disconnect()

The method for synchronous disconnection. All uncompleted operations will be
aborted.

=head2 quit( [ $cb->( $reply, $err ) ] )

The method for asynchronous disconnection.

=head1 OTHER METHODS

=head2 info( [ $section ] [, $cb->( $reply, $err ) ] )

Gets and parses information and statistics about the server. The result
is passed to callback as a hash reference.

More information about C<INFO> command can be found here:
L<http://redis.io/commands/info>

=head2 host()

Gets current host of the client.

=head2 port()

Gets current port of the client.

=head2 select( $index, [, $cb->( $reply, $err ) ] )

Selects the database by numeric index.

=head2 database()

Gets selected database index.

=head2 utf8( [ $boolean ] )

Enables or disables UTF-8 mode.

=head2 connection_timeout( [ $fractional_seconds ] )

Gets or sets the C<connection_timeout> of the client. The C<undef> value resets
the C<connection_timeout> to default value.

=head2 read_timeout( [ $fractional_seconds ] )

Gets or sets the C<read_timeout> of the client.

=head2 reconnect( [ $boolean ] )

Enables or disables reconnection mode of the client.

=head2 reconnect_interval( [ $fractional_seconds ] )

Gets or sets C<reconnect_interval> of the client.

=head2 on_connect( [ $callback ] )

Gets or sets the C<on_connect> callback.

=head2 on_disconnect( [ $callback ] )

Gets or sets the C<on_disconnect> callback.

=head2 on_error( [ $callback ] )

Gets or sets the C<on_error> callback.