This section focus on Monitor v1.3, as it introduces multiple improved compared to v1.2
This section focus on Monitor v1.2.1, as it introduces multiple improved compared to v1.2.0
Variables removed as unused or deprecated:
@ -101,12 +101,12 @@ The Monitor Module has several internal threads. There are currently 5 main thre
* monitor_ping_thread: main thread and scheduler for the ping checks
* monitor_read_only_thread: main thread and scheduler for the read only checks
* monitor_replication_lag_thread: main thread and scheduler for the replication lag checks
Up to version v1.2 the above threads but *Monitor* were also responsible to perform the checks
Up to version v1.2.0 the above threads but *Monitor* were also responsible to perform the checks
Thread Pool
===========
The implementation in v1.2 has a limitation with SSL implementation: with SSL, `connect()` is a blocking call, causing the threads to stall while performing the connect phase.
Version v1.3 tries to overcome this limitation with a new implementation. Now:
The implementation in v1.2.0 has a limitation with SSL implementation: with SSL, `connect()` is a blocking call, causing the threads to stall while performing the connect phase.
Version v1.2.1 tries to overcome this limitation with a new implementation. Now:
* *Monitor* initializes a Thread Pool of workers and creates a queue;
* *monitor_connect_thread*, *monitor_ping_thread*, *monitor_read_only_thread* and *monitor_replication_lag_thread* are producers that generate tasks and sent them to the workers using the queue;
* the workers process the tasks and perform the requires actions;
René Cannaò
10 years ago