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import pytest
from tests.beeswax.impala_beeswax import ImpalaBeeswaxException
from tests.common.impala_test_suite import ImpalaTestSuite
from tests.common.impala_cluster import ImpalaCluster
from tests.verifiers.metric_verifier import MetricVerifier

class TestFragmentLifecycle(ImpalaTestSuite):
  """Using the debug action interface, check that failed queries correctly clean up *all*
  fragments"""

  IN_FLIGHT_FRAGMENTS = "impala-server.num-fragments-in-flight"
  @classmethod
  def get_workload(self):
    return 'functional'

  @pytest.mark.execute_serially
  def test_failure_in_prepare(self):
    # Fail the scan node
    verifiers = [ MetricVerifier(i.service) for i in ImpalaCluster().impalads ]
    self.client.execute("SET DEBUG_ACTION='-1:0:PREPARE:FAIL'");
    try:
      self.client.execute("SELECT COUNT(*) FROM functional.alltypes")
      assert "Query should have thrown an error"
    except ImpalaBeeswaxException:
      pass

    for v in verifiers:
      v.wait_for_metric(self.IN_FLIGHT_FRAGMENTS, 0)

  @pytest.mark.execute_serially
  def test_failure_in_prepare_multi_fragment(self):
    # Test that if one fragment fails that the others are cleaned up during the ensuing
    # cancellation.
    verifiers = [ MetricVerifier(i.service) for i in ImpalaCluster().impalads ]
    # Fail the scan node
    self.client.execute("SET DEBUG_ACTION='-1:0:PREPARE:FAIL'");

    # Force a query plan that will have three fragments or more.
    try:
      self.client.execute("SELECT COUNT(*) FROM functional.alltypes a JOIN [SHUFFLE] \
        functional.alltypes b on a.id = b.id")
      assert "Query should have thrown an error"
    except ImpalaBeeswaxException:
      pass

    for v in verifiers:
      # Long timeout required because fragments may be blocked while sending data. The
      # default value of --datastream_sender_timeout_ms is 120s before they wake up and
      # cancel themselves.
      #
      # TODO: Fix when we have cancellable RPCs.
      v.wait_for_metric(self.IN_FLIGHT_FRAGMENTS, 0, timeout=125)