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From "Bill Farner" <>
Subject Re: Review Request 24078: Add an InstanceUpdater to fit into rolling update coordination in the scheduler.
Date Thu, 31 Jul 2014 23:52:34 GMT

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(Updated July 31, 2014, 11:52 p.m.)

Review request for Aurora, David McLaughlin, Kevin Sweeney, and Maxim Khutornenko.


fixed typos

Bugs: AURORA-621

Repository: aurora


Note: this is one part of the epic AURORA-610, and is currently unwired code.

This implements the logic to initiate a change from a possibly-absent current task state to
a possibly-absent desired state.  I worked with Maxim on this, and we started with a state
machine approach.  After some more careful thought, i pushed for a convergence function, which
is implemented here.

There are a few invariants assumed/designed here, which i've called out in the javadoc for

The caller of this function will be responsible for implementing the TaskController interface.
 As for integration, this will mean:
  - maintaining one InstanceUpdater for each in-flight instance update
  - subscribing to task pubsub events and routing them to the appropriate InstanceUpdater's
  - discarding terminal InstanceUpdaters (those which have called TaskController#updateCompleted())
  - scheduling delayed calls to evaluate() based on the job's update parameters

My advice for reviewing is to first scan the evaluate() function (without skipping out to
helper functions), then dive into handleActualAndDesiredPresent().  Think of evaluate() as
something that may be called arbitrarily, and attempts to gracefully move a task from the
actual state to the desired state.  Next, look at the unit test to see how the calls should
look to turn this function into an event-driven convergence function.

Diffs (updated)

  src/main/java/org/apache/aurora/scheduler/updater/ PRE-CREATION 
  src/main/java/org/apache/aurora/scheduler/updater/ PRE-CREATION 
  src/test/java/org/apache/aurora/scheduler/updater/ PRE-CREATION



./gradlew build -Pq, 100% instruction and branch test coverage.


Bill Farner

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