How to migrate a 'ReplicatedEnvironment' to a new set of servers?

Hi all

Our current 'ReplicatedEnvironment' must be migrated to a new set of servers with a new set of IP addresses.
Is it mandatory to have at least the connectivity between the "master" Server and the new servers?

I'm doing a local simulation as follows:
|-NodeName-|-GroupName-|--NodeHostPort--|---HelperHost---|----EnvHome----|
| Current1 | TEST      | 127.0.0.1:2001 | 127.0.0.1:2001 | ./envCurrent1 |
| Current2 | TEST      | 127.0.0.1:2002 | 127.0.0.1:2001 | ./envCurrent2 |
| Current3 | TEST      | 127.0.0.1:2003 | 127.0.0.1:2001 | ./envCurrent3 |
With success, he created a ReplicatedEnvironment with Current1 as master and Current2/3 as replicas.
Once the master and replicas are set, replica members are explicitly removed.
java -jar je-4.1.7.jar DbGroupAdmin -groupName TEST -helperHosts 127.0.0.1:2001 -removeMember Current2
java -jar je-4.1.7.jar DbGroupAdmin -groupName TEST -helperHosts 127.0.0.1:2001 -removeMember Current3
Then all the ReplicatedEnvironment are stop and I try to start a new ReplicatedEnvironment with the following configuration unsuccessfully :-(
|-NodeName-|-GroupName-|--NodeHostPort--|---HelperHost---|----EnvHome----|
| New1     | TEST      | 127.0.0.1:3001 | 127.0.0.1:3001 | ./envCurrent1 |
| New2     | TEST      | 127.0.0.1:3002 | 127.0.0.1:3001 | ./envNew2     |
| New3     | TEST      | 127.0.0.1:3003 | 127.0.0.1:3001 | ./envNew3     |
Each je.info.0 displays the following message: "new unknown node to the rep New1/2/3(-1) group.

So... is - it possible to somehow change the internal replication metadata to avoid the need for a "visibility on the network" between the old and the new infrastructure?

ARO
/ Caesar.

Caesar,

In a future release, we have a new feature that allows you to change the network address of a replicated environment, so you can do what you are trying to accomplish. This is a new option on DbGroupAdmin and a new method on ReplicationGroupAdmin:

updateAddress-
# update the network address of a
# node. The node should not be alive when
# address update

Note that it won't let you change the name of the node. The node name is unique for the Group and is immutable. To change the node name, you will need to remove and re-add the node. However, I don't think you really need to change the node name, network address.

However, I fear this is not available publicly yet. In 4.1.7 you will need to add the new nodes and remove old nodes, but as you say, it requires network connectivity.

Another option is to use DbDump to generate data on the application of one of the intermediate nodes. You would have to DbLoad which in a production node, use DbEnableReplication to reproduce and add nodes to the group.

I will also contact you by email to suggest another option.

Linda

Tags: Database

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