[jira] [Created] (KAFKA-12421) Improve controller's atomic grouping

["Jose Armando Garcia Sancio (Jira)" <ji...@apache.org>]

Jose Armando Garcia Sancio created KAFKA-12421:
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             Summary: Improve controller's atomic grouping
                 Key: KAFKA-12421
                 URL: https://issues.apache.org/jira/browse/KAFKA-12421
             Project: Kafka
          Issue Type: Improvement
          Components: controller
            Reporter: Jose Armando Garcia Sancio


The current controller implementation atomically appends to the metadata log by making sure that all required records are on the same batch. The controller groups all of the records that result from an RPC into one batch. Some of the RPCs are:
 # Client quota changes
 # Configuration changes
 # Feature changes
 # Topic creation

This is good enough for correctness but it is more aggressive than necessary. For example, for topic creation since errors are reported independently, the controller only needs to guarantee that all of the records for one topic are committed atomically.



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