dajac commented on code in PR #13623:
URL: https://github.com/apache/kafka/pull/13623#discussion_r1182595446
##########
core/src/test/scala/unit/kafka/log/LogCleanerTest.scala:
##########
@@ -62,6 +65,33 @@ class LogCleanerTest {
Utils.delete(tmpdir)
}
+ @Test
+ def testRemoveMetricsOnClose(): Unit = {
+ val mockMetricsGroupCtor = mockConstruction(classOf[KafkaMetricsGroup])
+ try {
+ val logCleaner = new LogCleaner(new CleanerConfig(true),
+ logDirs = Array(TestUtils.tempDir()),
+ logs = new Pool[TopicPartition, UnifiedLog](),
+ logDirFailureChannel = new LogDirFailureChannel(1),
+ time = time)
+
+ // shutdown logCleaner so that metrics are removed
+ logCleaner.shutdown()
+
+ val mockMetricsGroup = mockMetricsGroupCtor.constructed.get(0)
+ val numMetricsRegistered = 5
+ verify(mockMetricsGroup,
times(numMetricsRegistered)).newGauge(anyString(), any())
+ verify(mockMetricsGroup,
times(numMetricsRegistered)).removeMetric(anyString())
Review Comment:
nit: Should we actually verify that `removeMetric` was called for the metric
name that we expected?
##########
core/src/main/scala/kafka/log/LogCleaner.scala:
##########
@@ -124,29 +124,37 @@ class LogCleaner(initialConfig: CleanerConfig,
private def maxOverCleanerThreads(f: CleanerThread => Double): Int =
cleaners.foldLeft(0.0d)((max: Double, thread: CleanerThread) =>
math.max(max, f(thread))).toInt
+ private val maxBufferUtilizationPercentMetricName =
"max-buffer-utilization-percent"
+ private val cleanerRecopyPercentMetricName = "cleaner-recopy-percent"
+ private val maxCleanTimeMetricName = "max-clean-time-secs"
+ private val maxCompactionDelayMetricsName = "max-compaction-delay-secs"
+ private val deadThreadCountMetricName = "DeadThreadCount"
+ private val metricNames = Set.apply(maxBufferUtilizationPercentMetricName,
Review Comment:
Could we move those to the companion object? Moreover, as they are
constants, they should start with a capital letter. There is also an extra
space after `=` for some of them. You can also use `Set(..)` instead of
`Set.apply()`.
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