In this blog, we’ll discuss how the Percona XtraDB Cluster threading model works.
Percona XtraDB Cluster (PXC) creates a different set of threads to service its operations. These threads are in addition to existing MySQL threads. Let’s understand what these threads are and how they’re used. There are three main groups of threads:
-
Applier thread(s)
- Applier threads are meant to apply write-sets that the
node receives from other nodes (through cluster).
(write-message is directed through
gcv_recv_thread
.) - The number of applier threads is controlled using the
wsrep_slave_thread
configuration. (The default value is 1, so at least one wsrep applier thread …
- Applier threads are meant to apply write-sets that the
node receives from other nodes (through cluster).
(write-message is directed through