#!/usr/bin/env python
+# Copyright (C) The Arvados Authors. All rights reserved.
+#
+# SPDX-License-Identifier: AGPL-3.0
from __future__ import absolute_import, print_function
import functools
import logging
import time
+import re
import libcloud.common.types as cloud_types
+from libcloud.common.exceptions import BaseHTTPError
+
import pykka
from .. import \
arvados_node_missing, RetryMixin
from ...clientactor import _notify_subscribers
from ... import config
+from .transitions import transitions
+
+QuotaExceeded = "QuotaExceeded"
class ComputeNodeStateChangeBase(config.actor_class, RetryMixin):
"""Base class for actors that change a compute node's state.
self.cloud_size = cloud_size
self.arvados_node = None
self.cloud_node = None
+ self.error = None
if arvados_node is None:
self._later.create_arvados_node()
else:
def create_cloud_node(self):
self._logger.info("Sending create_node request for node size %s.",
self.cloud_size.name)
- self.cloud_node = self._cloud.create_node(self.cloud_size,
- self.arvados_node)
- if not self.cloud_node.size:
- self.cloud_node.size = self.cloud_size
+ try:
+ self.cloud_node = self._cloud.create_node(self.cloud_size,
+ self.arvados_node)
+ except BaseHTTPError as e:
+ if e.code == 429 or "RequestLimitExceeded" in e.message:
+ # Don't consider API rate limits to be quota errors.
+ # re-raise so the Retry logic applies.
+ raise
+
+ # The set of possible error codes / messages isn't documented for
+ # all clouds, so use a keyword heuristic to determine if the
+ # failure is likely due to a quota.
+ if re.search(r'(exceed|quota|limit)', e.message, re.I):
+ self.error = QuotaExceeded
+ self._logger.warning("Quota exceeded: %s", e)
+ self._finished()
+ return
+ else:
+ # Something else happened, re-raise so the Retry logic applies.
+ raise
+ except Exception as e:
+ raise
+
+ # The information included in the node size object we get from libcloud
+ # is inconsistent between cloud drivers. Replace libcloud NodeSize
+ # object with compatible CloudSizeWrapper object which merges the size
+ # info reported from the cloud with size information from the
+ # configuration file.
+ self.cloud_node.size = self.cloud_size
+
self._logger.info("Cloud node %s created.", self.cloud_node.id)
self._later.update_arvados_node_properties()
"""
# Reasons for a shutdown to be cancelled.
WINDOW_CLOSED = "shutdown window closed"
- NODE_BROKEN = "cloud failed to shut down broken node"
+ DESTROY_FAILED = "destroy_node failed"
def __init__(self, timer_actor, cloud_client, arvados_client, node_monitor,
cancellable=True, retry_wait=1, max_retry_wait=180):
self.success = success_flag
return super(ComputeNodeShutdownActor, self)._finished()
- def cancel_shutdown(self, reason):
+ def cancel_shutdown(self, reason, **kwargs):
self.cancel_reason = reason
self._logger.info("Shutdown cancelled: %s.", reason)
self._finished(success_flag=False)
- def _stop_if_window_closed(orig_func):
+ def _cancel_on_exception(orig_func):
@functools.wraps(orig_func)
- def stop_wrapper(self, *args, **kwargs):
- if (self.cancellable and
- (self._monitor.shutdown_eligible().get() is not True)):
- self._later.cancel_shutdown(self.WINDOW_CLOSED)
- return None
- else:
+ def finish_wrapper(self, *args, **kwargs):
+ try:
return orig_func(self, *args, **kwargs)
- return stop_wrapper
+ except Exception as error:
+ self._logger.error("Actor error %s", error)
+ self._logger.debug("", exc_info=True)
+ self._later.cancel_shutdown("Unhandled exception %s" % error, try_resume=False)
+ return finish_wrapper
- @ComputeNodeStateChangeBase._finish_on_exception
- @_stop_if_window_closed
- @RetryMixin._retry()
+ @_cancel_on_exception
def shutdown_node(self):
- self._logger.info("Starting shutdown")
- if not self._cloud.destroy_node(self.cloud_node):
- if self._cloud.broken(self.cloud_node):
- self._later.cancel_shutdown(self.NODE_BROKEN)
+ if self.cancellable:
+ self._logger.info("Checking that node is still eligible for shutdown")
+ eligible, reason = self._monitor.shutdown_eligible().get()
+ if not eligible:
+ self.cancel_shutdown("No longer eligible for shut down because %s" % reason,
+ try_resume=True)
return
- else:
- # Force a retry.
- raise cloud_types.LibcloudError("destroy_node failed")
- self._logger.info("Shutdown success")
+ self._destroy_node()
+
+ def _destroy_node(self):
+ self._logger.info("Starting shutdown")
arv_node = self._arvados_node()
- if arv_node is None:
- self._finished(success_flag=True)
+ if self._cloud.destroy_node(self.cloud_node):
+ self._logger.info("Shutdown success")
+ if arv_node:
+ self._later.clean_arvados_node(arv_node)
+ else:
+ self._finished(success_flag=True)
else:
- self._later.clean_arvados_node(arv_node)
+ self.cancel_shutdown(self.DESTROY_FAILED, try_resume=False)
@ComputeNodeStateChangeBase._finish_on_exception
@RetryMixin._retry(config.ARVADOS_ERRORS)
self._clean_arvados_node(arvados_node, "Shut down by Node Manager")
self._finished(success_flag=True)
- # Make the decorator available to subclasses.
- _stop_if_window_closed = staticmethod(_stop_if_window_closed)
-
-class ComputeNodeUpdateActor(config.actor_class):
+class ComputeNodeUpdateActor(config.actor_class, RetryMixin):
"""Actor to dispatch one-off cloud management requests.
This actor receives requests for small cloud updates, and
this to perform maintenance tasks on themselves. Having a
dedicated actor for this gives us the opportunity to control the
flow of requests; e.g., by backing off when errors occur.
-
- This actor is most like a "traditional" Pykka actor: there's no
- subscribing, but instead methods return real driver results. If
- you're interested in those results, you should get them from the
- Future that the proxy method returns. Be prepared to handle exceptions
- from the cloud driver when you do.
"""
- def __init__(self, cloud_factory, max_retry_wait=180):
+ def __init__(self, cloud_factory, timer_actor, max_retry_wait=180):
super(ComputeNodeUpdateActor, self).__init__()
+ RetryMixin.__init__(self, 1, max_retry_wait,
+ None, cloud_factory(), timer_actor)
self._cloud = cloud_factory()
- self.max_retry_wait = max_retry_wait
- self.error_streak = 0
- self.next_request_time = time.time()
+ self._later = self.actor_ref.tell_proxy()
- def _throttle_errors(orig_func):
- @functools.wraps(orig_func)
- def throttle_wrapper(self, *args, **kwargs):
- throttle_time = self.next_request_time - time.time()
- if throttle_time > 0:
- time.sleep(throttle_time)
- self.next_request_time = time.time()
- try:
- result = orig_func(self, *args, **kwargs)
- except Exception as error:
- self.error_streak += 1
- self.next_request_time += min(2 ** self.error_streak,
- self.max_retry_wait)
- raise
- else:
- self.error_streak = 0
- return result
- return throttle_wrapper
+ def _set_logger(self):
+ self._logger = logging.getLogger("%s.%s" % (self.__class__.__name__, self.actor_urn[33:]))
- @_throttle_errors
+ def on_start(self):
+ self._set_logger()
+
+ @RetryMixin._retry()
def sync_node(self, cloud_node, arvados_node):
return self._cloud.sync_node(cloud_node, arvados_node)
):
super(ComputeNodeMonitorActor, self).__init__()
self._later = self.actor_ref.tell_proxy()
- self._last_log = None
self._shutdowns = shutdown_timer
self._cloud_node_fqdn = cloud_fqdn_func
self._timer = timer_actor
self.subscribers.add(subscriber)
def _debug(self, msg, *args):
- if msg == self._last_log:
- return
- self._last_log = msg
self._logger.debug(msg, *args)
- def in_state(self, *states):
- # Return a boolean to say whether or not our Arvados node record is in
- # one of the given states. If state information is not
- # available--because this node has no Arvados record, the record is
- # stale, or the record has no state information--return None.
- if (self.arvados_node is None) or not timestamp_fresh(
- arvados_node_mtime(self.arvados_node), self.node_stale_after):
- return None
+ def get_state(self):
+ """Get node state, one of ['unpaired', 'busy', 'idle', 'down']."""
+
+ # If this node is not associated with an Arvados node, return 'unpaired'.
+ if self.arvados_node is None:
+ return 'unpaired'
+
state = self.arvados_node['crunch_worker_state']
- if not state:
- return None
- result = state in states
- if state == 'idle':
- result = result and not self.arvados_node['job_uuid']
- return result
+
+ # If state information is not available because it is missing or the
+ # record is stale, return 'down'.
+ if not state or not timestamp_fresh(arvados_node_mtime(self.arvados_node),
+ self.node_stale_after):
+ state = 'down'
+
+ # There's a window between when a node pings for the first time and the
+ # value of 'slurm_state' is synchronized by crunch-dispatch. In this
+ # window, the node will still report as 'down'. Check that
+ # first_ping_at is truthy and consider the node 'idle' during the
+ # initial boot grace period.
+ if (state == 'down' and
+ self.arvados_node['first_ping_at'] and
+ timestamp_fresh(self.cloud_node_start_time,
+ self.boot_fail_after) and
+ not self._cloud.broken(self.cloud_node)):
+ state = 'idle'
+
+ # "missing" means last_ping_at is stale, this should be
+ # considered "down"
+ if arvados_node_missing(self.arvados_node, self.node_stale_after):
+ state = 'down'
+
+ # Turns out using 'job_uuid' this way is a bad idea. The node record
+ # is assigned the job_uuid before the job is locked (which removes it
+ # from the queue) which means the job will be double-counted as both in
+ # the wishlist and but also keeping a node busy. This end result is
+ # excess nodes being booted.
+ #if state == 'idle' and self.arvados_node['job_uuid']:
+ # state = 'busy'
+
+ return state
+
+ def in_state(self, *states):
+ return self.get_state() in states
def shutdown_eligible(self):
- """Return True if eligible for shutdown, or a string explaining why the node
- is not eligible for shutdown."""
+ """Determine if node is candidate for shut down.
- if not self._shutdowns.window_open():
- return "shutdown window is not open."
- if self.arvados_node is None:
- # Node is unpaired.
- # If it hasn't pinged Arvados after boot_fail seconds, shut it down
- if timestamp_fresh(self.cloud_node_start_time, self.boot_fail_after):
- return "node is still booting, will be considered a failed boot at %s" % time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(self.cloud_node_start_time + self.boot_fail_after))
- else:
- return True
- missing = arvados_node_missing(self.arvados_node, self.node_stale_after)
- if missing and self._cloud.broken(self.cloud_node):
- # Node is paired, but Arvados says it is missing and the cloud says the node
- # is in an error state, so shut it down.
- return True
- if missing is None and self._cloud.broken(self.cloud_node):
- self._logger.info(
- "Cloud node considered 'broken' but paired node %s last_ping_at is None, " +
- "cannot check node_stale_after (node may be shut down and we just haven't gotten the message yet).",
- self.arvados_node['uuid'])
- if self.in_state('idle'):
- return True
+ Returns a tuple of (boolean, string) where the first value is whether
+ the node is candidate for shut down, and the second value is the
+ reason for the decision.
+ """
+
+ # Collect states and then consult state transition table whether we
+ # should shut down. Possible states are:
+ # crunch_worker_state = ['unpaired', 'busy', 'idle', 'down']
+ # window = ["open", "closed"]
+ # boot_grace = ["boot wait", "boot exceeded"]
+ # idle_grace = ["not idle", "idle wait", "idle exceeded"]
+
+ if self.arvados_node and not timestamp_fresh(arvados_node_mtime(self.arvados_node), self.node_stale_after):
+ return (False, "node state is stale")
+
+ crunch_worker_state = self.get_state()
+
+ window = "open" if self._shutdowns.window_open() else "closed"
+
+ if timestamp_fresh(self.cloud_node_start_time, self.boot_fail_after):
+ boot_grace = "boot wait"
else:
- return "node is not idle."
+ boot_grace = "boot exceeded"
+
+ # API server side not implemented yet.
+ idle_grace = 'idle exceeded'
+
+ node_state = (crunch_worker_state, window, boot_grace, idle_grace)
+ t = transitions[node_state]
+ if t is not None:
+ # yes, shutdown eligible
+ return (True, "node state is %s" % (node_state,))
+ else:
+ # no, return a reason
+ return (False, "node state is %s" % (node_state,))
def consider_shutdown(self):
try:
+ eligible, reason = self.shutdown_eligible()
next_opening = self._shutdowns.next_opening()
- eligible = self.shutdown_eligible()
- if eligible is True:
- self._debug("Suggesting shutdown.")
+ if eligible:
+ self._debug("Suggesting shutdown because %s", reason)
_notify_subscribers(self.actor_ref.proxy(), self.subscribers)
- elif self._shutdowns.window_open():
- self._debug("Cannot shut down because %s", eligible)
- elif self.last_shutdown_opening != next_opening:
- self._debug("Shutdown window closed. Next at %s.",
- time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(next_opening)))
- self._timer.schedule(next_opening, self._later.consider_shutdown)
- self.last_shutdown_opening = next_opening
+ else:
+ self._debug("Not eligible for shut down because %s", reason)
+
+ if self.last_shutdown_opening != next_opening:
+ self._debug("Shutdown window closed. Next at %s.",
+ time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(next_opening)))
+ self._timer.schedule(next_opening, self._later.consider_shutdown)
+ self.last_shutdown_opening = next_opening
except Exception:
self._logger.exception("Unexpected exception")
projects / arvados.git / blobdiff