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Build # 1779

Build Type

push

travis-ci

Committed by web-flow

Commit Message

Refactor subjob start threading (#386)

This is a follow-up to the previous change to move subjob start off
of `SafeThread` to avoid taking down the master service. This change
further improves the behavior when a subjob start call fails.

- Instead of the `Slave` class starting a new thread to kick off a
  subjob, `ClusterMaster` starts the thread. This makes more sense
  since threads are only started to perform asynchronous actions in
  response to API requests and the `Slave` class shouldn't need to
  worry about that.
- In the case where a new subjob is not started and the slave is
  instead torn down, previously the teardown API call happened
  synchronously with the slave's API call to report a result (which
  is bad). The teardown API call is now asynchronous.
- Record error metric when subjob fails to start.
- Requeue subjobs when subjob fails to start because of a dead slave
  or an error on the slave side. Previously subjobs were only
  requeued if the slave was explicitly put in shutdown mode.

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