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RUBY-174 doc updates for reads from secondaries

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This commit is contained in:
Kyle Banker 2010-11-24 14:01:39 -05:00
parent e621db732e
commit 1c982aa7a7
1 changed files with 10 additions and 6 deletions
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16
docs/REPLICA_SETS.md
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@ -6,16 +6,20 @@ 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.
Connecting to a replica set from the Ruby driver is easy. If you only want to specify a single node, simply pass that node to `Connection.new`:
Use `Connection.multi` to connect to a replica set:
@connection = Connection.new('foo.local', 27017)
@connection = Connection.multi([['n1.mydb.net', 27017], ['n2.mydb.net', 27017], ['n3.mydb.net', 27017]])
If you want to pass in multiple seed nodes, use `Connection.multi`:
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.
@connection = Connection.multi([['n1.mydb.net', 27017],
['n2.mydb.net', 27017], ['n3.mydb.net', 27017]])
### Read slaves
In both cases, the driver will attempt to connect to a master node and, when found, will merge any other known members of the replica set into the seed list.
If you want to read from a seconday node, you can pass :read_secondary => true.
@connection = Connection.multi([['n1.mydb.net', 27017], ['n2.mydb.net', 27017], ['n3.mydb.net', 27017]],
:read_secondary => true)
A random secondary will be chosen to be read from. In a typical multi-process Ruby application, you'll have a good distribution of reads across secondary nodes.
### Connection Failures