Details
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Wish
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Status: Resolved
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Blocker
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Resolution: Not A Problem
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None
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Description
Scenario:
Datacenter 1 (Main) -> One Application Server (Client Node CN1) and One DB
Server (Server Node SN1).
Datacenter 2 (Recovery) -> One Application Server (Client Node CN2) and One
DB Server (Server Node SN2).
Usually, all the user requests go to CN1 but not CN2. So, technically we will
not run CN2. So forget about CN2. I will tell you why it's used later.
So there are three nodes here running -> CN1, SN1, SN2.
Question 1:
We don't use Apache Ignite for cache purposes, but we will use it for disk
persistent storage. And we don't need Ignite for partitioning data (we will
think about it later). Now, how to make sure that the data that is being
stored in SN1 will be replicated to SN2. We want SN2 to be backup node for
SN1. Is that possible? If so, how?
Conditions:
1. CN1 usually should not make connections with SN2 (since it's backup).
2. SN1 and SN2 link will be very fragile and of less bandwidth. Usually,
both will be in different network segments.
Question 2:
Let's say SN1 is down. Now, will the queries automatically reach SN2 without
doing anything? And if SN1 is restarted, can we expect the queries to reach
SN1 instead of SN2, as CN1 - SN2 link is slow?
Question 3 :
After a few months, we will flip the entire setup, making DC2 as Main and
DC1 as Recovery. In this case, CN2 will make connections to SN2 and CN1 will
not be running. How to quickly switch so that SN2 is replicated almost with
SN1 and be ready to serve requests from CN2?
PS: We are using JDBC Thin Client, so if possible please answer in that context with examples.