Neha Narkhede created KAFKA-841:
-----------------------------------
Summary: Merge the partition and replica state machines into a
single unified state machine in the controller
Key: KAFKA-841
URL: https://issues.apache.org/jira/browse/KAFKA-841
Project: Kafka
Issue Type: Improvement
Components: controller
Affects Versions: 0.8.1
Reporter: Neha Narkhede
Assignee: Neha Narkhede
After using the controller for a while as part of 0.8, I think it might be
worth looking into merging the separate state machines into a single unified
one. The reason is most events end up invoking state transitions on both
partitions and replicas. Initially, the thought of separating the two was to
handle cases which only touch one state machine (for example, changing the
replication factor or changing the number of partitions online). However, these
features also would end up touching both state machines. The complexity comes
from the correct ordering that one has to ensure between the operations on both
these state machines (KAFKA-831). Due to this, some state transitions are
unable to batch RPCs and/or zookeeper writes/reads since they need to happen in
each of the state machines separately. Since this will significantly change
controller code, I'm filing this for 0.8.1
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
