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2013-11-05T17:30:01.927
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2015-03-18T14:44:24.520
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2015-03-18T14:44:24.520
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9
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text
Body
This is was a confusing API choice that we regret in PyMongo 2.x. We will merge all the client classes into MongoClient in PyMongo 3, in April 2015: <a href="http://emptysqua.re/blog/good-idea-at-the-time-pymongo-mongoreplicasetclient/" rel="nofollow">http://emptysqua.re/blog/good-idea-at-the-time-pymongo-mongoreplicasetclient/</a> Meanwhile: <ol> <li>Use MongoReplicaSetClient when you plan to connect to a whole replica set. MongoClient only connects to one member.</li> <li>A single MongoReplicaSetClient can be used to perform primary or secondary reads, as well as more sophisticated decision-making with read preferences, see <a href="http://emptysqua.re/blog/reading-from-mongodb-replica-sets-with-pymongo/" rel="nofollow">my blog post on the subject</a>. A MongoClient will connect to one member of the replica set (the primary) and always read from it, unless you make a direct connection to a secondary using MongoClient, in which case it will always read from that secondary.</li> <li>MongoReplicaSetClient monitors the set's health with a background thread that periodically checks on all the members. The client tracks whether members are up, it tracks their ping times, and it notices when a member is added. This will reduce the number of exceptions you see on a flaky network or when the replica set's configuration changes, and it allows the client to correctly implement read preferences.</li> <li>A MongoReplicaSetClient does in fact connect to all members, whereas a MongoClient only connects to one member. MongoReplicaSetClient tries to connect to each member listed in the connection string; as soon as it connects to one it asks that member for a list of all other members. From this point forward it ignores your connection string and uses the list it got from the member it connected to.</li> </ol>
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singulars
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1. This table or related slice is empty.
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1. POpymongo: Advantage of using MongoReplicaSetClient?
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1. USA. Jesse Jiryu Davis
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1. USA. Jesse Jiryu Davis
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