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Status Under review
Workspace Data Replication: Change Data Capture
Created by Guest
Created on Nov 13, 2024

RELATED IDEAS

Ability to Reconnect during a failure on a highly available Database like Cockroach DB

See this idea on ideas.ibm.com

We are replicating data from DB2 to Cockroach DB using the CDC FlexRep flavor. And we have a highly available multi region/multi cluster Cockroach DB which allows client to access the database anytime. A client connecting to the Database uses a Network Load Balancer which decides which node is healthy and points the traffic to that node. During an event of a node failure we observe that CDC is able to identify the failure but instead of reconnecting to the database by making a new connection it keeps using the already established connection and retries there and eventually fails after the retry limit is reached. Having a feature to make new connections and then retrying a failed transaction will make the CDC a true highly available system.

 

Needed By Month
  • Guest
    Reply
    |     Mar 17, 2025

    When there is a node down scenario then we typically a client using a PostgreSQL gets an error with org.postgresql.util.PSQLException: ERROR: server Where as for an error that requires a transaction restart for Cockroach DB with a healthy DB connections receive a 40001 error cods. Attached are some of the common Cockroach DB errors that can be resolved by just retrying the UOW to the database using the same connection. https://www.cockroachlabs.com/docs/stable/common-errors

    But in case of a multi node Cockroach DB cluster and one node goes down CDC has to trap the org.postgresql.util.PSQLException: ERROR: server kind of error and then restart the subscription.

  • Admin
    Davendra Paltoo
    Reply
    |     Mar 17, 2025

    Can you please share if the "node down" situation will result in a different sql code returned from the database compared to the "not node down" scenario?

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