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import signal
import time

from tests.common.custom_cluster_test_suite import CustomClusterTestSuite


class TestPauseMonitor(CustomClusterTestSuite):
  """Class for pause monitor tests."""

  @CustomClusterTestSuite.with_args("--logbuflevel=-1")
  def test_jvm_pause_monitor_logs_entries(self):
    """This test injects a non-GC pause and confirms that that the JVM pause
    monitor detects and logs it."""
    impalad = self.cluster.get_first_impalad()
    # Send a SIGSTOP for the process and block it for 5s.
    impalad.kill(signal.SIGSTOP)
    time.sleep(5)
    impalad.kill(signal.SIGCONT)
    # Wait for over a second for the cache metrics to expire.
    time.sleep(2)
    # Check that the pause is detected.
    self.assert_impalad_log_contains('INFO', "Detected pause in JVM or host machine")
    # Check that the metrics we have for this updated as well
    assert impalad.service.get_metric_value("jvm.gc_num_info_threshold_exceeded") > 0
    assert impalad.service.get_metric_value("jvm.gc_total_extra_sleep_time_millis") > 0