Refactor how we launch spot instances (#366)

* use create_instances for spot instances too * deprecate --ec2-spot-request-duration * remove unused date utilities for translating durations into expirations * add changelog
nchammas · Nov 21, 2023 · 0a7821b · 0a7821b
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diff --git a/CHANGES.md b/CHANGES.md
@@ -8,11 +8,13 @@
 
 * [#348]: Bumped default Spark to 3.2; dropped support for Python 3.6; added CI build for Python 3.10.
 * [#361]: Migrated from AdoptOpenJDK, which is deprecated, to Adoptium OpenJDK.
-* [#362]: Improved Flintrock's ability to cleanup after launch failures.
+* [#362][#366]: Improved Flintrock's ability to cleanup after launch failures.
+* [#366]: Deprecated `--ec2-spot-request-duration`, which is not needed for one-time spot instances launched using the RunInstances API.
 
 [#348]: https://github.com/nchammas/flintrock/pull/348
 [#361]: https://github.com/nchammas/flintrock/pull/361
 [#362]: https://github.com/nchammas/flintrock/pull/362
+[#366]: https://github.com/nchammas/flintrock/pull/366
 
 ## [2.0.0] - 2021-06-10
 

diff --git a/flintrock/config.yaml.template b/flintrock/config.yaml.template
@@ -35,7 +35,6 @@ providers:
     # ami: ami-61bbf104  # CentOS 7, us-east-1
     # user: centos
     # spot-price: <price>
-    # spot-request-duration: 7d  # duration a spot request is valid, supports d/h/m/s (e.g. 4d 3h 2m 1s)
     # vpc-id: <id>
     # subnet-id: <id>
     # placement-group: <name>

diff --git a/flintrock/ec2.py b/flintrock/ec2.py
@@ -27,7 +27,6 @@
 )
 from .ssh import generate_ssh_key_pair
 from .services import SecurityGroupRule
-from .util import duration_to_expiration
 
 logger = logging.getLogger('flintrock.ec2')
 
@@ -275,7 +274,6 @@ def add_slaves(
         identity_file: str,
         num_slaves: int,
         spot_price: float,
-        spot_request_duration: str,
         min_root_ebs_size_gb: int,
         tags: list,
         assume_yes: bool,
@@ -321,7 +319,6 @@ def add_slaves(
                 num_instances=num_slaves,
                 region=self.region,
                 spot_price=spot_price,
-                spot_request_valid_until=duration_to_expiration(spot_request_duration),
                 ami=self.master_instance.image_id,
                 assume_yes=assume_yes,
                 key_name=self.master_instance.key_name,
@@ -704,7 +701,6 @@ def _create_instances(
     num_instances,
     region,
     spot_price,
-    spot_request_valid_until,
     ami,
     assume_yes,
     key_name,
@@ -724,7 +720,6 @@ def _create_instances(
     ec2 = boto3.resource(service_name='ec2', region_name=region)
 
     cluster_instances = []
-    spot_requests = []
     common_launch_specs = {
         'ImageId': ami,
         'KeyName': key_name,
@@ -733,7 +728,6 @@ def _create_instances(
         'Placement': {
             'AvailabilityZone': availability_zone,
             'Tenancy': tenancy,
-            'GroupName': placement_group,
         },
         'SecurityGroupIds': security_group_ids,
         'SubnetId': subnet_id,
@@ -748,80 +742,36 @@ def _create_instances(
         ],
     }
 
+    if spot_price:
+        common_launch_specs.update({
+            'InstanceMarketOptions': {
+                'MarketType': 'spot',
+                'SpotOptions': {
+                    'SpotInstanceType': 'one-time',
+                    'MaxPrice': str(spot_price),
+                    'InstanceInterruptionBehavior': 'terminate',
+                },
+            }
+        })
+    else:
+        common_launch_specs.update({
+            'InstanceInitiatedShutdownBehavior': instance_initiated_shutdown_behavior,
+        })
+        # This can't be part of the previous update because we need a deep merge.
+        common_launch_specs['Placement'].update({
+            'GroupName': placement_group,
+        })
+
     try:
-        if spot_price:
-            user_data = base64.b64encode(user_data.encode('utf-8')).decode()
-            logger.info("Requesting {c} spot instances at a max price of ${p}...".format(
-                c=num_instances, p=spot_price))
-            client = ec2.meta.client
-            spot_requests = client.request_spot_instances(
-                SpotPrice=str(spot_price),
-                InstanceCount=num_instances,
-                ValidUntil=spot_request_valid_until,
-                LaunchSpecification=common_launch_specs,
-            )['SpotInstanceRequests']
-
-            request_ids = [r['SpotInstanceRequestId'] for r in spot_requests]
-            pending_request_ids = request_ids
-
-            while pending_request_ids:
-                logger.info("{grant} of {req} instances granted. Waiting...".format(
-                    grant=num_instances - len(pending_request_ids),
-                    req=num_instances))
-                time.sleep(30)
-                spot_requests = client.describe_spot_instance_requests(
-                    SpotInstanceRequestIds=request_ids)['SpotInstanceRequests']
-
-                failed_requests = [r for r in spot_requests if r['State'] == 'failed']
-                if failed_requests:
-                    failure_reasons = {r['Status']['Code'] for r in failed_requests}
-                    raise Error(
-                        "The spot request failed for the following reason{s}: {reasons}"
-                        .format(
-                            s='' if len(failure_reasons) == 1 else 's',
-                            reasons=', '.join(failure_reasons)))
-
-                pending_request_ids = [
-                    r['SpotInstanceRequestId'] for r in spot_requests
-                    if r['State'] == 'open']
-
-            logger.info("All {c} instances granted.".format(c=num_instances))
-
-            cluster_instances = list(
-                ec2.instances.filter(
-                    Filters=[
-                        {'Name': 'instance-id', 'Values': [r['InstanceId'] for r in spot_requests]}
-                    ]))
-        else:
-            cluster_instances = ec2.create_instances(
-                MinCount=num_instances,
-                MaxCount=num_instances,
-                # Shutdown Behavior is specific to on-demand instances.
-                InstanceInitiatedShutdownBehavior=instance_initiated_shutdown_behavior,
-                **common_launch_specs,
-            )
+        cluster_instances = ec2.create_instances(
+            MinCount=num_instances,
+            MaxCount=num_instances,
+            **common_launch_specs,
+        )
         return cluster_instances
     except (Exception, KeyboardInterrupt) as e:
         if not isinstance(e, KeyboardInterrupt):
             print(e, file=sys.stderr)
-        if spot_requests:
-            request_ids = [r['SpotInstanceRequestId'] for r in spot_requests]
-            if any([r['State'] != 'active' for r in spot_requests]):
-                print("Canceling spot instance requests...", file=sys.stderr)
-                client.cancel_spot_instance_requests(
-                    SpotInstanceRequestIds=request_ids)
-            # Make sure we have the latest information on any launched spot instances.
-            spot_requests = client.describe_spot_instance_requests(
-                SpotInstanceRequestIds=request_ids)['SpotInstanceRequests']
-            instance_ids = [
-                r['InstanceId'] for r in spot_requests
-                if 'InstanceId' in r]
-            if instance_ids:
-                cluster_instances = list(
-                    ec2.instances.filter(
-                        Filters=[
-                            {'Name': 'instance-id', 'Values': instance_ids}
-                        ]))
         raise InterruptedEC2Operation(instances=cluster_instances) from e
 
 
@@ -842,7 +792,6 @@ def launch(
         user,
         security_groups,
         spot_price=None,
-        spot_request_duration=None,
         min_root_ebs_size_gb,
         vpc_id,
         subnet_id,
@@ -916,7 +865,6 @@ def launch(
     common_instance_spec = {
         'region': region,
         'spot_price': spot_price,
-        'spot_request_valid_until': duration_to_expiration(spot_request_duration),
         'ami': ami,
         'assume_yes': assume_yes,
         'key_name': key_name,

diff --git a/flintrock/flintrock.py b/flintrock/flintrock.py
@@ -39,6 +39,11 @@
 else:
     THIS_DIR = os.path.dirname(os.path.realpath(__file__))
 
+EC2_SPOT_REQUEST_DURATION_DEPRECATION_MESSAGE = (
+    "Deprecation: --ec2-spot-request-duration is deprecated. One-time spot instances do "
+    "not support a request duration. "
+    "For more information see: https://github.com/nchammas/flintrock/pull/366"
+)
 
 logger = logging.getLogger('flintrock.flintrock')
 
@@ -345,8 +350,8 @@ def cli(cli_context, config, provider, debug):
               help="Additional security groups names to assign to the instances. "
                    "You can specify this option multiple times.")
 @click.option('--ec2-spot-price', type=float)
-@click.option('--ec2-spot-request-duration', default='7d',
-              help="Duration a spot request is valid (e.g. 3d 2h 1m).")
+@click.option('--ec2-spot-request-duration',
+              help="(DEPRECATED) Duration a spot request is valid (e.g. 3d 2h 1m).")
 @click.option('--ec2-min-root-ebs-size-gb', type=int, default=30)
 @click.option('--ec2-vpc-id', default='', help="Leave empty for default VPC.")
 @click.option('--ec2-subnet-id', default='')
@@ -414,6 +419,9 @@ def launch(
     """
     Launch a new cluster.
     """
+    if ec2_spot_request_duration:
+        logger.warning(EC2_SPOT_REQUEST_DURATION_DEPRECATION_MESSAGE)
+
     provider = cli_context.obj['provider']
     services = []
 
@@ -511,7 +519,6 @@ def launch(
             user=ec2_user,
             security_groups=ec2_security_groups,
             spot_price=ec2_spot_price,
-            spot_request_duration=ec2_spot_request_duration,
             min_root_ebs_size_gb=ec2_min_root_ebs_size_gb,
             vpc_id=ec2_vpc_id,
             subnet_id=ec2_subnet_id,
@@ -787,8 +794,8 @@ def stop(cli_context, cluster_name, ec2_region, ec2_vpc_id, assume_yes):
               help="Path to SSH .pem file for accessing nodes.")
 @click.option('--ec2-user')
 @click.option('--ec2-spot-price', type=float)
-@click.option('--ec2-spot-request-duration', default='7d',
-              help="Duration a spot request is valid (e.g. 3d 2h 1m).")
+@click.option('--ec2-spot-request-duration',
+              help="(DEPRECATED) Duration a spot request is valid (e.g. 3d 2h 1m).")
 @click.option('--ec2-min-root-ebs-size-gb', type=int, default=30)
 @click.option('--assume-yes/--no-assume-yes', default=False)
 @click.option('--ec2-tag', 'ec2_tags',
@@ -816,6 +823,8 @@ def add_slaves(
     Flintrock will configure new slaves based on information queried
     automatically from the master.
     """
+    if ec2_spot_request_duration:
+        logger.warning(EC2_SPOT_REQUEST_DURATION_DEPRECATION_MESSAGE)
     provider = cli_context.obj['provider']
 
     option_requires(
@@ -842,7 +851,6 @@ def add_slaves(
         provider_options = {
             'min_root_ebs_size_gb': ec2_min_root_ebs_size_gb,
             'spot_price': ec2_spot_price,
-            'spot_request_duration': ec2_spot_request_duration,
             'tags': ec2_tags
         }
     else:

diff --git a/flintrock/util.py b/flintrock/util.py
@@ -1,7 +1,5 @@
 import os
 import sys
-from datetime import datetime, timedelta, timezone
-from decimal import Decimal
 
 FROZEN = getattr(sys, 'frozen', False)
 
@@ -20,47 +18,6 @@ def get_subprocess_env() -> dict:
     return env
 
 
-def duration_to_timedelta(duration_string):
-    """
-    Convert a time duration string (e.g. 3h 4m 10s) into a timedelta
-    """
-
-    duration_string = duration_string.lower()
-
-    total_seconds = Decimal('0')
-
-    prev_num = []
-    for character in duration_string:
-        if character.isalpha():
-            if prev_num:
-                num = Decimal(''.join(prev_num))
-                if character == 'd':
-                    total_seconds += num * 60 * 60 * 24
-                elif character == 'h':
-                    total_seconds += num * 60 * 60
-                elif character == 'm':
-                    total_seconds += num * 60
-                elif character == 's':
-                    total_seconds += num
-                prev_num = []
-
-        elif character.isnumeric() or character == '.':
-            prev_num.append(character)
-
-    return timedelta(seconds=float(total_seconds))
-
-
-def duration_to_expiration(duration_string):
-    default_duration = timedelta(days=7)
-
-    if not duration_string:
-        expiration = datetime.now(tz=timezone.utc) + default_duration
-    else:
-        expiration = datetime.now(tz=timezone.utc) + duration_to_timedelta(duration_string)
-
-    return expiration
-
-
 def spark_hadoop_build_version(hadoop_version: str) -> str:
     """
     Given a Hadoop version, determine the Hadoop build of Spark to use.

diff --git a/tests/test_util.py b/tests/test_util.py
@@ -1,23 +1,4 @@
-from datetime import datetime, timedelta, timezone
-from flintrock.util import (
-    duration_to_timedelta,
-    duration_to_expiration,
-    spark_hadoop_build_version,
-)
-from freezegun import freeze_time
-
-
-def test_duration_to_timedelta():
-    assert duration_to_timedelta('1d') == timedelta(days=1)
-    assert duration_to_timedelta('3d2h1m') == timedelta(days=3, hours=2, minutes=1)
-    assert duration_to_timedelta('4d 2h 1m 5s') == timedelta(days=4, hours=2, minutes=1, seconds=5)
-    assert duration_to_timedelta('36h') == timedelta(hours=36)
-    assert duration_to_timedelta('7d') == timedelta(days=7)
-
-
-@freeze_time("2012-01-14")
-def test_duration_to_expiration():
-    assert duration_to_expiration('5m') == datetime.now(tz=timezone.utc) + timedelta(minutes=5)
+from flintrock.util import spark_hadoop_build_version
 
 
 def test_spark_hadoop_build_version():