[FLINK-20332] Add workers recovered from previous attempt to pending resources

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Won't Do
• Component/s: Runtime / Coordination
• Labels: pull-request-available
• Assignee: Xintong Song
• Reporter: Xintong Song
• Created: 25/Nov/20 02:51
• Updated: 26/Feb/21 10:31
• Resolved: 26/Feb/21 10:30

Description

For active deployments (Native K8s/Yarn/Mesos), after a JM failover, workers from previous attempt should register to the new JM. Depending on the order that slot requests and TM registrations arrive at the RM, it could happen that RM allocates unnecessary new resources while there are recovered resources that can be reused.

A potential improvement is to add recovered workers to pending resources, so that RM knows what resources are expected to be available soon and decide whether to allocate new resources accordingly.

See also the discussion in FLINK-20249.

Issue Links

• relates to: FLINK-20249 Rethink the necessity of the k8s internal Service even in non-HA mode
• links to: GitHub Pull Request #15001