Benjamin Mahler created MESOS-7688: -------------------------------------- Summary: Improve master failover performance by reducing unnecessary agent retries. Key: MESOS-7688 URL: https://issues.apache.org/jira/browse/MESOS-7688 Project: Mesos Issue Type: Improvement Components: agent, master Reporter: Benjamin Mahler
Currently, during a failover the agents will (re-)register with the master. While the master is recovering, the master may drop messages from the agents, and so the agents must retry registration using a backoff mechanism. For large clusters, there can be a lot of overhead in processing unnecessary retries from the agents, given that these messages must be deserialized and contain all of the task / executor information many times over. In order to reduce this overhead, the idea is to avoid the need for agents to blindly retry (re-)registration with the master. Two approaches for this are: (1) Update the MasterInfo in ZK when the master is recovered. This is a bit of an abuse of MasterInfo unfortunately, but the idea is for agents to only (re-)register when they see that the master reaches a recovered state. Once recovered, the master will not drop messages, and therefore agents only need to retry when the connection breaks. (2) Have the master reply with a retry message when it's in the recovering state, so that agents get a clear signal that their messages were dropped. This one is less optimal, because the master may have to process a lot of messages and send retries, but once the master is recovered, the master will process only a single (re-)registration from each agent. Here, agents only retry when the connection breaks or they get a retry message. -- This message was sent by Atlassian JIRA (v6.4.14#64029)