jmckenzie-dev commented on code in PR #3696:
URL: https://github.com/apache/cassandra/pull/3696#discussion_r1913737379


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src/java/org/apache/cassandra/config/Config.java:
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@@ -543,9 +543,12 @@ public static class SSTableConfig
     public volatile DurationSpec.IntMinutesBound index_summary_resize_interval 
= new DurationSpec.IntMinutesBound("60m");
 
     @Replaces(oldName = "gc_log_threshold_in_ms", converter = 
Converters.MILLIS_DURATION_INT, deprecated = true)
-    public volatile DurationSpec.IntMillisecondsBound gc_log_threshold = new 
DurationSpec.IntMillisecondsBound("200ms");
+    public volatile DurationSpec.IntMillisecondsBound gc_log_threshold = new 
DurationSpec.IntMillisecondsBound("20s");

Review Comment:
   Ah. So this was explicitly done for our internal build since we run ZGC only 
on this release and the logging volume was roughly doubled w/the switch to ZGC. 
Let me take a todo item to break out that threshold to offer a different value 
we rely on in the ZGC case instead of hijacking the default shared value, thus 
polluting the G1 / CMS cases.



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