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Why do we need an 'arbiter' in MongoDB replication?


Why do we need an 'arbiter' in MongoDB replication?

By : Yvonne Doll
Date : November 28 2020, 01:01 AM
Any of those help I created a spreadsheet to better illustrate the effect of Arbiter nodes in a Replica Set.
code :


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MongoDB Arbiter AWS EC2

MongoDB Arbiter AWS EC2


By : Abrar
Date : March 29 2020, 07:55 AM
this one helps. I would not use Amazon Micro for an Arbiter as Micro instances can have long lags in processing which could trigger the replication threshold for non-response. In this case you will go into Secondary only ready only mode and your app can't do any writes as once the arbiter has voted it can't revote.
Go with at least m1.small as you are guaranteed computing power or as someone else suggested throw it as a share on another instance.
Migrate MongoDB arbiter

Migrate MongoDB arbiter


By : angyalg
Date : March 29 2020, 07:55 AM
help you fix your problem In fact it is much simpler:
Start the new arbiter Connect to the primary member
code :
cfg = rs.conf()
cfg.members[0].host = newhost
rs.reconfig(cfg)
MongoDb arbiter can be used with multiple replicaSets?

MongoDb arbiter can be used with multiple replicaSets?


By : Christoph Dorn
Date : March 29 2020, 07:55 AM
hop of those help? You can have multiple arbiter processes running on a single server (different ports). They are quite lightweight in terms of resources, as all they are doing is voting. You should look into starting the arbiters with the following arguments to keep them as lightweight as possible (from the Command Line Parameters Page):
--smallfiles - Use a smaller initial file size (16MB) and maximum size (512MB) --nojournal - Disable journaling. In v2.0+, journaling is on by default for 64-bit
Issue with Arbiter feature compatibility after upgrade of replica set of two nodes with Arbiter to 3.6

Issue with Arbiter feature compatibility after upgrade of replica set of two nodes with Arbiter to 3.6


By : user7716272
Date : March 29 2020, 07:55 AM
Two nodes MongoDB replica set without arbiter

Two nodes MongoDB replica set without arbiter


By : Bon Coin
Date : March 29 2020, 07:55 AM
hope this fix your issue Short answer: don't.
Long answer: the way automatic failover works in MongoDB is that a replica set needs a qualified majority to successfully elect a new primary. Delayed members do have votes in elections. So if either of your nodes fails the replica set finds out that it doesn't have this majority and the current primary steps down even if it didn't fail. So what you essentially do is doubling the chances of making your replica set fail. An arbiter is a very cheap process, in term of RAM usage, CPU and even disk space when run with --smallfiles --no-journal --noprealloc or the equivalent options set in the config file. Note that the mentioned options are safe to use, since an arbiter essentially only checks the heartbeats of the data bearing nodes. You could put the arbiter on the application server for example.
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