zachjsh commented on code in PR #15710:
URL: https://github.com/apache/druid/pull/15710#discussion_r1456584149


##########
server/src/main/java/org/apache/druid/server/coordinator/duty/KillUnusedSegments.java:
##########
@@ -85,46 +92,56 @@ public KillUnusedSegments(
       DruidCoordinatorConfig config
   )
   {
+    if (config.getCoordinatorKillPeriod().getMillis() < 
config.getCoordinatorIndexingPeriod().getMillis()) {
+      throw InvalidInput.exception(
+          "druid.coordinator.kill.period[%s] must be >= 
druid.coordinator.period.indexingPeriod[%s]",
+          config.getCoordinatorKillPeriod(),
+          config.getCoordinatorIndexingPeriod()
+      );
+    }
+    if (config.getCoordinatorKillMaxSegments() < 0) {
+      throw InvalidInput.exception(
+          "druid.coordinator.kill.maxSegments[%s] is invalid. It must be a 
positive integer.",
+          config.getCoordinatorKillMaxSegments()
+      );
+    }
     this.period = config.getCoordinatorKillPeriod().getMillis();
-    Preconditions.checkArgument(
-        this.period >= config.getCoordinatorIndexingPeriod().getMillis(),
-        "coordinator kill period must be greater than or equal to 
druid.coordinator.period.indexingPeriod"
-    );
-
-    this.ignoreRetainDuration = 
config.getCoordinatorKillIgnoreDurationToRetain();
-    this.retainDuration = 
config.getCoordinatorKillDurationToRetain().getMillis();
-    if (this.ignoreRetainDuration) {
+    this.ignoreDurationToRetain = 
config.getCoordinatorKillIgnoreDurationToRetain();
+    this.durationToRetain = 
config.getCoordinatorKillDurationToRetain().getMillis();
+    if (this.ignoreDurationToRetain) {
       log.debug(
-          "druid.coordinator.kill.durationToRetain [%s] will be ignored when 
discovering segments to kill "
-          + "because you have set 
druid.coordinator.kill.ignoreDurationToRetain to True.",
-          this.retainDuration
+          "druid.coordinator.kill.durationToRetain[%s] will be ignored when 
discovering segments to kill "
+          + "because druid.coordinator.kill.ignoreDurationToRetain is set to 
true.",
+          this.durationToRetain
       );
     }
     this.bufferPeriod = config.getCoordinatorKillBufferPeriod().getMillis();
 
     this.maxSegmentsToKill = config.getCoordinatorKillMaxSegments();
-    Preconditions.checkArgument(this.maxSegmentsToKill > 0, "coordinator kill 
maxSegments must be > 0");
-
     datasourceToLastKillIntervalEnd = new ConcurrentHashMap<>();
 
     log.info(
-        "Kill Task scheduling enabled with period [%s], retainDuration [%s], 
bufferPeriod [%s], maxSegmentsToKill [%s]",
+        "Kill task scheduling enabled with period[%s], durationToRetain[%s], 
bufferPeriod[%s], maxSegmentsToKill[%s]",
         this.period,
-        this.ignoreRetainDuration ? "IGNORING" : this.retainDuration,
+        this.ignoreDurationToRetain ? "IGNORING" : this.durationToRetain,
         this.bufferPeriod,
         this.maxSegmentsToKill
     );
 
     this.segmentsMetadataManager = segmentsMetadataManager;
     this.overlordClient = overlordClient;
+    this.lastKillTime = DateTimes.nowUtc();
   }
 
   @Override
   public DruidCoordinatorRuntimeParams run(DruidCoordinatorRuntimeParams 
params)
   {
-    final long currentTimeMillis = System.currentTimeMillis();
-    if (lastKillTime + period > currentTimeMillis) {
-      log.debug("Skipping kill of unused segments as kill period has not 
elapsed yet.");
+    if (!canDutyRun()) {
+      log.info(
+          "Skipping KillUnusedSegments until period[%s] have elapsed after 
last kill time[%s].",

Review Comment:
   I would leave this as debug, as some configurations may run this duty with a 
small time period , like every minute, and don't think we want to log this 
every period.



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