Sanil15 opened a new pull request #1227: SAMZA-2404: Container Placement Handler for dispatching container placement messages between metastore and JobCoordinator URL: https://github.com/apache/samza/pull/1227 **Design:** [SEP-22: Container Placements in Samza](https://cwiki.apache.org/confluence/display/SAMZA/SEP-22%3A+Container+Placements+in+Samza) **Changes:** : Following abilities are added as a part of this PR: 1. Container placement handler which is a stateless handler that periodically dispatches messages between the Metadata store and the Container Placement Service APIs running as a part of Job Coordinator 2. ContainerPlacementRequestMessage & ContainerPlacementResponseMessage are two POJO used to encapsulate request & response messages for container placement actions 3. Custom ObjectMapper for serializing and deserializing these messages is added as a part of ContainerPlacementMessageObjectMapper **Tests:** 1. Unit tests are added to test message serialization & deserialization 2. Unit tests to test ContainerPlacementHandler 2. Manual testing has been done to see reads / writes from meta-store **API Changes:**: 1. Adds two new public exposed API class: ContainerPlacementRequestMessage & ContainerPlacementResponseMessage in samza-api 2. ContainerPlacementRequestMessage are messages used to issue container placement actions, one can write these messages to meta-store using Meta-store writer 3. ContainerPlacementResponseMessage are messages used as a response to container placement actions, Job Coordinator writes these messages to Meta-store so external controllers can read response to the current actions **Upgrade Instructions:** Existing jobs with a persisted metastore will be able to ignore these newly populated messages because they have a different namespace **Usage Instructions:** An external controller / tool (ex: CoordinatorStreamWriter) would be able to issue such actions by writing to metastore (currently: CoordinatorStream)
---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services
