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RUBY-247 Improved replica set docs.

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This commit is contained in:
Kyle Banker 2011-03-12 08:40:29 -05:00
parent 2b7739a257
commit 6a46bf7aef
2 changed files with 9 additions and 6 deletions
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7
docs/REPLICA_SETS.md
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@ -6,12 +6,13 @@ Here follow a few considerations for those using the MongoDB Ruby driver with [r
First, make sure that you've configured and initialized a replica set. First, make sure that you've configured and initialized a replica set.
Use `ReplSetConnection.new` to connect to a replica set: Use `ReplSetConnection.new` to connect to a replica set. This method, which accepts a variable number of arugments,
takes a list of seed nodes followed by any connection options. You'll want to specify at least two seed nodes. This gives
the driver more chances to connect in the event that any one seed node is offline. Once the driver connects, it will
cache the replica set topology as reported by the given seed node and use that information if a failover is later required.
@connection = ReplSetConnection.new(['n1.mydb.net', 27017], ['n2.mydb.net', 27017], ['n3.mydb.net', 27017]) @connection = ReplSetConnection.new(['n1.mydb.net', 27017], ['n2.mydb.net', 27017], ['n3.mydb.net', 27017])
The driver will attempt to connect to a master node and, when found, will replace all seed nodes with known members of the replica set.
### Read slaves ### Read slaves
If you want to read from a seconday node, you can pass :read_secondary => true to ReplSetConnection#new. If you want to read from a seconday node, you can pass :read_secondary => true to ReplSetConnection#new.

8
lib/mongo/repl_set_connection.rb
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@ -29,8 +29,8 @@ module Mongo
# Connection#arbiters. This is useful if your application needs to connect manually to nodes other # Connection#arbiters. This is useful if your application needs to connect manually to nodes other
# than the primary. # than the primary.
# #
# @param [Array] args A list of host-port pairs ending with a hash containing any options. See # @param [Array] args A list of host-port pairs to be used as seed nodes followed by a
# the examples below for exactly how to use the constructor. # hash containing any options. See the examples below for exactly how to use the constructor.
# #
# @option options [String] :rs_name (nil) The name of the replica set to connect to. You # @option options [String] :rs_name (nil) The name of the replica set to connect to. You
# can use this option to verify that you're connecting to the right replica set. # can use this option to verify that you're connecting to the right replica set.
@ -47,7 +47,9 @@ module Mongo
# this is the number of seconds to wait for a new connection to be released before throwing an exception. # this is the number of seconds to wait for a new connection to be released before throwing an exception.
# Note: this setting is relevant only for multi-threaded applications. # Note: this setting is relevant only for multi-threaded applications.
# #
# @example Connect to a replica set and provide two seed nodes: # @example Connect to a replica set and provide two seed nodes. Note that the number of seed nodes does
# not have to be equal to the number of replica set members. The purpose of seed nodes is to permit
# the driver to find at least one replica set member even if a member is down.
# ReplSetConnection.new(['localhost', 30000], ['localhost', 30001]) # ReplSetConnection.new(['localhost', 30000], ['localhost', 30001])
# #
# @example Connect to a replica set providing two seed nodes and ensuring a connection to the replica set named 'prod': # @example Connect to a replica set providing two seed nodes and ensuring a connection to the replica set named 'prod':