Does Percona XtraDB Cluster use binlog_checksum, and can it be safely set to NONE?

MySQL & MariaDB Percona XtraDB Cluster 8.x
1

Hello,

I have a doubt regarding binlog_checksum in Percona XtraDB Cluster (PXC 8.0.40).

By default, Percona (like standard MySQL) uses binlog_checksum=CRC32. My questions are:

  1. Does Percona XtraDB Cluster explicitly rely on the binlog_checksum setting for replication or internal consistency checks?
  2. Is it safe or recommended to change binlog_checksum to NONE on just one node of the cluster, or must this setting be uniform across all nodes?
  3. Could setting binlog_checksum=NONE cause replication issues or data inconsistency within the cluster?

I’d appreciate any guidance or best practices on managing the binlog_checksum setting within a Percona XtraDB Cluster.

Thanks in advance!

2

Hi,
Please find my answers inline.

  1. Does Percona XtraDB Cluster explicitly rely on the binlog_checksum setting for replication or internal consistency checks?

Percona XtraDB Cluster uses Galera synchronous replication, which operates differently from standard MySQL asynchronous replication that relies on the binary log. Galera replicates writesets (logical transactions), not binary log events.

binlog_checksum controls whether checksums are written in the binary log. It is mostly relevant for asynchronous replication (e.g., master-slave replication using binlogs).
In PXC, unless you are also using asynchronous replication (async slave) in parallel with Galera (so-called hybrid replication), the binlog_checksum setting is effectively unused for the core Galera replication.

  1. Is it safe or recommended to change binlog_checksum to NONE on just one node of the cluster, or must this setting be uniform across all nodes?

As explained above, if you are not using asynchronous replication anywhere with Galera, it doesn’t matter you are setting it NONE for one node or all. But it’s better to keep uniformity across the cluster.

  1. Could setting binlog_checksum=NONE cause replication issues or data inconsistency within the cluster?

This is covered in the above reply.

3

Perfect
Thank you very much!