GitHub user dguy opened a pull request:

    KAFKA-5152: move state restoration out of rebalance and into poll loop

    In `onPartitionsAssigned`: 
    1. release all locks for non-assigned suspended tasks.
    2. resume any suspended tasks.
    3. Create new tasks, but don't attempt to take the state lock.
    4. Pause partitions for any new tasks.
    5. set the state to `PARTITIONS_ASSIGNED`
    In `StreamThread#runLoop`
    1. poll
    2. if state is `PARTITIONS_ASSIGNED`
     2.1  attempt to initialize any new tasks, i.e, take out the state locks 
and init state stores
     2.2 restore some data for changelogs, i.e., poll once on the restore 
consumer and return the partitions that have been fully restored
     2.3 update tasks with restored partitions and move any that have completed 
restoration to running
     2.4 resume consumption for any tasks where all partitions have been 
     2.5 if all active tasks are running, transition to `RUNNING` and assign 
standby partitions to the restoreConsumer.

You can merge this pull request into a Git repository by running:

    $ git pull 0.11.0-restore-on-poll

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #3653
commit 27016b9e9706ee95bcedd9a1408c71e62a0f178e
Author: Damian Guy <>
Date:   2017-08-09T19:02:17Z

    restore state on the poll loop


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