roger v1.0.0 Roger.Partition.Global

Coordinates the global Roger partition state

Each Roger partition has a single place where global state is kept. Global state (and global coordination) is needed for the following things:

  • Job cancellation; when cancelling a job, we store the job ID globally; when the cancelled job is started, we check the job id against this list of cancelled ids.

  • Queue keys; some jobs dictate that they cannot be queued when there is already a job queued with an identical queue key; if so, the job fails to enqueue.

  • Execution keys; jobs which have the same execution key cannot be executed concurrently and need to wait on one another.

  • Pause states; it is globally stored which queues are currently paused.

The per-partition Global process stores all this information. It provides hooks to persist the information between partition / node restarts. By default, the global state is loaded from and written to the filesystem, but it is possible to override the persister, like this:

config :roger, Roger.Partition.Global,
  persister: Your.PersisterModule

The persister module must implement the Roger.Partition.Global.StatePersister behaviour, which provides simple load and save functions.

Summary

Functions

Mark a job id as cancelled

Check whether a given job id has been marked cancelled

Check whether a given execution key has been set

Get the set of paused queues for the given partition_id

Cluster-wide pausing of the given queue in the given partition_id

Cluster-wide pausing of the given queue in the given partition_id

Check whether a given queue key has been marked enqueued

Remove the given execution key

Remove a given queue key

Functions

cancel_job(partition_id, job_id)
cancel_job(partition_id :: String.t, job_id :: String.t) :: :ok

Mark a job id as cancelled.

This does not check for the validity of the job id. The job will not be removed from the queue, but instead will be removed as soon as it’s dequeued.

When a job is currently executing, the process of a running job will be killed.

cancelled?(partition_id, job_id, remove \\ nil)
cancelled?(partition_id :: String.t, job_id :: String.t, remove :: :remove) :: boolean

Check whether a given job id has been marked cancelled

executing?(partition_id, execution_key, add \\ nil)
executing?(partition_id :: String.t, execution_key :: String.t, add :: :add) :: boolean

Check whether a given execution key has been set

queue_get_paused(partition_id)
queue_get_paused(partition_id :: String.t) :: {:ok, MapSet.t}

Get the set of paused queues for the given partition_id.

queue_pause(partition_id, queue)
queue_pause(partition_id :: String.t, queue :: any) :: :ok

Cluster-wide pausing of the given queue in the given partition_id.

queue_resume(partition_id, queue)
queue_resume(partition_id :: String.t, queue :: any) :: :ok

Cluster-wide pausing of the given queue in the given partition_id.

queued?(partition_id, queue_key, add \\ nil)
queued?(partition_id :: String.t, queue_key :: String.t, add :: :add) :: boolean

Check whether a given queue key has been marked enqueued

remove_executed(partition_id, execution_key)
remove_executed(partition_id :: String.t, execution_key :: String.t) :: :ok

Remove the given execution key

remove_queued(partition_id, queue_key)
remove_queued(partition_id :: String.t, queue_key :: String.t) :: :ok

Remove a given queue key