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from tests.common.impala_test_suite import ImpalaTestSuite


class TestJvmMetrics(ImpalaTestSuite):
  """Class for checking JVM Metrics."""

  def test_jvm_metrics(self):
    """The following metrics should exist and come from the JVM."""
    impalad = self.impalad_test_service
    # These metrics can't possibly be zero, so we assert that
    # they're positive.
    NON_ZERO_METRICS = [
      "jvm.heap.current-usage-bytes",
      "jvm.heap.max-usage-bytes",
      "jvm.non-heap.committed-usage-bytes",
      "jvm.total.current-usage-bytes",
    ]
    for m in NON_ZERO_METRICS:
      assert impalad.get_metric_value(m) > 0

    # One can imagine somehow there being no GCs, so do
    # a weaker assertion that they're non-negative and non-None.
    for m in ["jvm.gc_count", "jvm.gc_time_millis"]:
      assert impalad.get_metric_value(m) >= 0