Siddharth Wagle created AMBARI-20562:
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Summary: Perf: Asynchronous event handling server/agent
Key: AMBARI-20562
URL: https://issues.apache.org/jira/browse/AMBARI-20562
Project: Ambari
Issue Type: Epic
Reporter: Siddharth Wagle
Assignee: Siddharth Wagle
Priority: Critical
Ambari's internal event model is heavily fragmented with some of the events
that result in state transitions being synchronous in nature. The proposal of
this Epic is to standardize event handling on the server-side and utilize its
asynchronous nature to make architecture changes that are geared to towards
scaling up the performance of Ambari server. The goal is to support 5K active
nodes with this new architecture.
To summarize the entailment:
- Write a Global Event Observer to allow clients to subscribe to server side
events
- Use websocket protocol to reduce network chatter between agent and server
- Reduce the work server has to do to generate STATUS commands for heartbeats.
- Make execution commands leaner replacing the need for providing topology info
and configs with every command, instead rely on event model.
- Re-architect the agent to make it more intelligent towards maintaining daemon
status and configs.
- Reduce computation requirements for every heartbeat and allow for parallel
processing of agent side events
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