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[core] Avoid terminating cluster for resources unavailability #2170

Merged
merged 13 commits into from
Jul 3, 2023
Merged

[core] Avoid terminating cluster for resources unavailability #2170

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ff7272e
fix key interruption
Michaelvll Jul 1, 2023
460ceaf
fix
Michaelvll Jul 2, 2023
1d10976
format
Michaelvll Jul 2, 2023
c485ffe
fix spot
Michaelvll Jul 2, 2023
98bb90a
fix comment
Michaelvll Jul 2, 2023
148bad0
Address comments
Michaelvll Jul 3, 2023
318c114
Update sky/backends/cloud_vm_ray_backend.py
Michaelvll Jul 3, 2023
fd09434
revert log lib
Michaelvll Jul 3, 2023
1194bbd
revert log_lib
Michaelvll Jul 3, 2023
a8d2840
Merge branch 'master' of github.com:skypilot-org/skypilot into avoid-…
Michaelvll Jul 3, 2023
7908c32
Update sky/backends/backend_utils.py
Michaelvll Jul 3, 2023
b1f638e
Merge branch 'avoid-terminate-cluster-for-resources-unavailability' o…
Michaelvll Jul 3, 2023
949c4fb
better logging
Michaelvll Jul 3, 2023
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18 changes: 11 additions & 7 deletions sky/backends/backend_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2047,7 +2047,7 @@ def _update_cluster_status(
def _refresh_cluster_record(
cluster_name: str,
*,
force_refresh: bool = False,
force_refresh_statuses: Optional[Set[status_lib.ClusterStatus]] = None,
acquire_per_cluster_status_lock: bool = True
) -> Optional[Dict[str, Any]]:
"""Refresh the cluster, and return the possibly updated record.
Expand All @@ -2058,8 +2058,10 @@ def _refresh_cluster_record(

Args:
cluster_name: The name of the cluster.
force_refresh: if True, refresh the cluster status even if it may be
skipped. Otherwise (the default), only refresh if the cluster:
force_refresh_statuses: if specified, refresh the cluster has one of
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the specified statuses. Additionally, clusters satisfying the
following conditions will always be refreshed no matter the
argument is specified or not:
1. is a spot cluster, or
2. is a non-spot cluster, is not STOPPED, and autostop is set.
acquire_per_cluster_status_lock: Whether to acquire the per-cluster lock
Expand Down Expand Up @@ -2089,7 +2091,9 @@ def _refresh_cluster_record(
use_spot = handle.launched_resources.use_spot
has_autostop = (record['status'] != status_lib.ClusterStatus.STOPPED and
record['autostop'] >= 0)
if force_refresh or has_autostop or use_spot:
force_refresh_for_cluster = (force_refresh_statuses is not None and
record['status'] in force_refresh_statuses)
if force_refresh_for_cluster or has_autostop or use_spot:
record = _update_cluster_status(
cluster_name,
acquire_per_cluster_status_lock=acquire_per_cluster_status_lock)
Expand All @@ -2100,7 +2104,7 @@ def _refresh_cluster_record(
def refresh_cluster_status_handle(
cluster_name: str,
*,
force_refresh: bool = False,
force_refresh_statuses: Optional[Set[status_lib.ClusterStatus]] = None,
acquire_per_cluster_status_lock: bool = True,
) -> Tuple[Optional[status_lib.ClusterStatus],
Optional[backends.ResourceHandle]]:
Expand All @@ -2112,7 +2116,7 @@ def refresh_cluster_status_handle(
"""
record = _refresh_cluster_record(
cluster_name,
force_refresh=force_refresh,
force_refresh_statuses=force_refresh_statuses,
acquire_per_cluster_status_lock=acquire_per_cluster_status_lock)
if record is None:
return None, None
Expand Down Expand Up @@ -2331,7 +2335,7 @@ def _refresh_cluster(cluster_name):
try:
record = _refresh_cluster_record(
cluster_name,
force_refresh=True,
force_refresh_statuses=set(status_lib.ClusterStatus),
acquire_per_cluster_status_lock=True)
except (exceptions.ClusterStatusFetchingError,
exceptions.CloudUserIdentityError,
Expand Down
18 changes: 17 additions & 1 deletion sky/backends/cloud_vm_ray_backend.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3746,7 +3746,23 @@ def _check_existing_cluster(
cluster_name)
prev_cluster_status, handle = (
backend_utils.refresh_cluster_status_handle(
cluster_name, acquire_per_cluster_status_lock=False))
cluster_name,
# We force refresh for the init status to determine the actual
# state of a previous cluster in INIT state.
#
# This is important for the case, where an existing cluster is
# transitioned into INIT state due to key interruption during
# launching, with the following steps:
# (1) launch, after answering prompt immediately ctrl-c;
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What happens if we do these two steps for a new cluster name? I imagine with this PR, at step 2 we should not set it to STOPPED and we should do the provisioning loop as usual.

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We won't set it to stop for a new cluster, because the new cluster will only have the following two cases:

  1. the cluster is provisioned, but not correctly setup yet. Then the cluster will be in INIT state, and our failover will still be triggered.
  2. the cluster is not provisioned. Then the cluster will be removed from the cluster table when we refresh the status, so the failover will be correctly triggered as well.

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This repro gave

Running task on cluster dbg2...
I 07-03 09:45:21 cloud_vm_ray_backend.py:3788] The cluster 'dbg2' was autodowned or manually terminated on the cloud console. Using the same resources as the previously terminated one to provision a new cluster.
I 07-03 09:45:21 cloud_vm_ray_backend.py:3813] Creating a new cluster: "dbg2" [1x AWS(m6i.large)].

Maybe we should change L3788's logging to (or something more clear):

The cluster 'dbg2' (status: XXX) was not found on the cloud: it may be autodowned, manually terminated, or its launch never succeeded. Provisioning a new cluster by using the same resources as its original launch.

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@Michaelvll Michaelvll Jul 3, 2023 •
edited
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Good point! Updated the logging. Tested again with:

  • sky launch -c min --cloud gcp --cpus 2; manually terminate the cluster on the console; python -c 'import sky; sky.launch(sky.Task(), cluster_name="min")' again

# (2) launch again.
# If we don't refresh the state of the cluster and reset it back
# to STOPPED, our failover logic will consider it as an abnormal
# cluster after hitting resources capacity limit on the cloud,
# and will start failover. This is not desired, because the user
# may want to keep the data on the disk of that cluster.
force_refresh_statuses={status_lib.ClusterStatus.INIT},
acquire_per_cluster_status_lock=False,
))
if prev_cluster_status is not None:
assert handle is not None
# Cluster already exists.
Expand Down
3 changes: 2 additions & 1 deletion sky/spot/controller.py
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Original file line number Diff line number Diff line change
Expand Up @@ -201,7 +201,8 @@ def _run_one_task(self, task_id: int, task: 'sky.Task') -> bool:
# determine whether the cluster is preempted.
(cluster_status,
handle) = backend_utils.refresh_cluster_status_handle(
cluster_name, force_refresh=True)
cluster_name,
force_refresh_statuses=set(status_lib.ClusterStatus))

if cluster_status != status_lib.ClusterStatus.UP:
# The cluster is (partially) preempted. It can be down, INIT
Expand Down
3 changes: 2 additions & 1 deletion sky/spot/recovery_strategy.py
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Expand Up @@ -182,7 +182,8 @@ def _wait_until_job_starts_on_cluster(self) -> Optional[float]:
try:
cluster_status, _ = (
backend_utils.refresh_cluster_status_handle(
self.cluster_name, force_refresh=True))
self.cluster_name,
force_refresh_statuses=set(status_lib.ClusterStatus)))
except Exception as e: # pylint: disable=broad-except
# If any unexpected error happens, retry the job checking
# loop.
Expand Down
13 changes: 7 additions & 6 deletions sky/spot/spot_utils.py
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Expand Up @@ -749,13 +749,14 @@ def is_spot_controller_up(
identity.
"""
try:
# Set force_refresh=False to make sure the refresh only happens when the
# controller is INIT/UP. This optimization avoids unnecessary costly
# refresh when the controller is already stopped. This optimization is
# based on the assumption that the user will not start the controller
# manually from the cloud console.
# Set force_refresh_statuses=None to make sure the refresh only happens
# when the controller is INIT/UP (triggered in these statuses as the
# autostop is always set for spot controller). This optimization avoids
# unnecessary costly refresh when the controller is already stopped.
# This optimization is based on the assumption that the user will not
# start the controller manually from the cloud console.
controller_status, handle = backend_utils.refresh_cluster_status_handle(
SPOT_CONTROLLER_NAME, force_refresh=False)
SPOT_CONTROLLER_NAME, force_refresh_statuses=None)
except exceptions.ClusterStatusFetchingError as e:
# We do not catch the exceptions related to the cluster owner identity
# mismatch, please refer to the comment in
Expand Down
2 changes: 1 addition & 1 deletion tests/test_spot.py
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Expand Up @@ -103,7 +103,7 @@ def test_down_spot_controller(self, _mock_cluster_state, monkeypatch):
def mock_cluster_refresh_up(
cluster_name: str,
*,
force_refresh: bool = False,
force_refresh_statuses: bool = False,
acquire_per_cluster_status_lock: bool = True,
):
record = global_user_state.get_cluster_from_name(cluster_name)
Expand Down