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# to you under the Apache License, Version 2.0 (the
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# under the License.
# Impala tests for Hive Metastore, covering the expected propagation
# of metadata from Hive to Impala or Impala to Hive. Each test
# modifies the metadata via Hive and checks that the modification
# succeeded by querying Impala, or vice versa.
import requests
import time
import json
from tests.common.environ import build_flavor_timeout
class EventProcessorUtils(object):
DEFAULT_CATALOG_URL = "http://localhost:25020"
def wait_for_event_processing(hive_client, timeout=10):
"""Waits till the event processor has synced to the latest event id from metastore
or the timeout value in seconds whichever is earlier"""
success = False
assert timeout > 0
assert hive_client is not None
current_event_id = EventProcessorUtils.get_current_notification_id(hive_client)
end_time = time.time() + timeout
while time.time() < end_time:
new_event_id = EventProcessorUtils.get_last_synced_event_id()
if new_event_id >= current_event_id:
success = True
if not success:
raise Exception(
"Event processor did not sync till last known event id{0} \
within {1} seconds".format(current_event_id, timeout))
# Wait for catalog update to be propagated.
time.sleep(build_flavor_timeout(6, slow_build_timeout=10))
return success
def get_event_processor_metrics():
"""Scrapes the catalog's /events webpage and return a dictionary with the event
processor metrics."""
response = requests.get("%s/events?json" % EventProcessorUtils.DEFAULT_CATALOG_URL)
assert response.status_code ==
varz_json = json.loads(response.text)
metrics = varz_json["event_processor_metrics"].strip().splitlines()
# Helper to strip a pair of elements
def strip_pair(p):
return (p[0].strip(), p[1].strip())
pairs = [strip_pair(kv.split(':')) for kv in metrics if kv]
return dict(pairs)
def get_last_synced_event_id():
"""Returns the last_synced_event_id."""
metrics = EventProcessorUtils.get_event_processor_metrics()
assert 'last-synced-event-id' in metrics.keys()
return int(metrics['last-synced-event-id'])
def get_event_processor_status():
Returns the current status of the EventsProcessor
metrics = EventProcessorUtils.get_event_processor_metrics()
assert 'status' in metrics.keys()
return metrics['status']
def get_current_notification_id(hive_client):
"""Returns the current notification from metastore"""
assert hive_client is not None
return hive_client.get_current_notificationEventId()