[SPARK-32921] Extend MapOutputTracker to support tracking and serving the metadata about each merged shuffle partitions for a given shuffle in push-based shuffle scenario

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.1.0
• Fix Version/s: 3.2.0
• Component/s: Shuffle, Spark Core
• Assignee: Venkata krishnan Sowrirajan
• Reporter: Min Shen
• Created: 17/Sep/20 17:48
• Updated: 26/Apr/21 05:20
• Resolved: 26/Apr/21 05:20

Description

Similar to MapStatus, which tracks the metadata about each map task's shuffle output, we also need to track the metadata about each merged shuffle partition with push-based shuffle. We currently term this as MergeStatus.

Since MergeStatus tracks metadata from the perspective of reducer tasks, it's not efficient to break up the metadata tracked in a MergeStatus and spread it across multiple MapStatus.

Issue Links

• links to: [Github] Pull Request #30480 (Victsm)