zachjsh commented on code in PR #16719:
URL: https://github.com/apache/druid/pull/16719#discussion_r1672822867
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server/src/main/java/org/apache/druid/server/coordinator/duty/KillUnusedSegments.java:
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@@ -75,14 +77,23 @@ public class KillUnusedSegments implements CoordinatorDuty
private final Duration durationToRetain;
private final boolean ignoreDurationToRetain;
private final int maxSegmentsToKill;
+ private final Duration bufferPeriod;
/**
* Used to keep track of the last interval end time that was killed for each
* datasource.
*/
private final Map<String, DateTime> datasourceToLastKillIntervalEnd;
+
+ /**
+ * State that is maintained in the duty to determine if the duty needs to
run or not.
+ */
private DateTime lastKillTime;
- private final Duration bufferPeriod;
+
+ /**
+ * Round-robin iterator of the datasources to kill. It's updated in every
run by the duty.
+ */
+ private final RoundRobinIterator datasourceIterator;
Review Comment:
Is this iterator thread safe? What protects this duty from only having one
thread running at a given time?
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