PgPool复制-直接插入Master，它将复制到Slave

Question

I am looking at PostgreSQL 9.4 Streaming Replication with PgPool for Load Balancing vs. using PgPool replication. Since PgPool replication is statement / middleware based does it mean that if I directly update the Master outside of PgPool it will not replicate? Will PgPool detect that the master and slave are out of sync?

Thanks in advance for your help.

Answer 1

If I directly update the Master outside of PgPool it will not replicate?

You are correct.

Will PgPool detect that the master and slave are out of sync?

Sort of--it can monitor statements and check to see if all servers return the same result depending on configuration settings such as replication_stop_on_mismatch .

Overall, pgpool replication is quite crude, you ought to use the built-in streaming replication feature unless you have a really good reason otherwise.