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import pytest
from tests.common.custom_cluster_test_suite import CustomClusterTestSuite
from tests.common.environ import specific_build_type_timeout
from tests.common.skip import SkipIfBuildType
from tests.util.filesystem_utils import IS_ISILON

# IMPALA-6100: add additional margin for error for slow build types.
SLOW_BUILD_TIMEOUT=20000
DELAY_MS = specific_build_type_timeout(10000, slow_build_timeout=SLOW_BUILD_TIMEOUT)
# IMPALA-6381: Isilon can behave as a slow build.
if IS_ISILON:
  DELAY_MS = SLOW_BUILD_TIMEOUT

@SkipIfBuildType.not_dev_build
class TestExchangeDelays(CustomClusterTestSuite):
  """Tests for handling delays in finding data stream receivers"""

  @classmethod
  def get_workload(self):
    return 'functional-query'

  @pytest.mark.execute_serially
  @CustomClusterTestSuite.with_args(
      "--stress_datastream_recvr_delay_ms={0}".format(DELAY_MS)
      + " --datastream_sender_timeout_ms=5000")
  def test_exchange_small_delay(self, vector):
    """Test delays in registering data stream receivers where the first one or two
    batches will time out before the receiver registers, but subsequent batches will
    arrive after the receiver registers. Before IMPALA-2987, this scenario resulted in
    incorrect results.
    """
    self.run_test_case('QueryTest/exchange-delays', vector)

  @pytest.mark.execute_serially
  @CustomClusterTestSuite.with_args(
      "--stress_datastream_recvr_delay_ms={0}".format(DELAY_MS)
      + " --datastream_sender_timeout_ms=1")
  def test_exchange_large_delay(self, vector):
    """Test delays in registering data stream receivers where all of the batches sent
    will time out before the receiver registers. Before IMPALA-2987, this scenario
    resulted in the query hanging.
    """
    self.run_test_case('QueryTest/exchange-delays', vector)

    # Test the special case when no batches are sent and the EOS message times out.
    self.run_test_case('QueryTest/exchange-delays-zero-rows', vector)