FrankChen021 commented on code in PR #19985:
URL: https://github.com/apache/druid/pull/19985#discussion_r3796307031


##########
server/src/main/java/org/apache/druid/segment/loading/SegmentLocalCacheManager.java:
##########
@@ -557,17 +559,31 @@ public AcquireSegmentAction acquireSegment(final 
DataSegment dataSegment, final
                   makeOnDemandLoadSupplier(hold.getEntry(), location),
                   hold
               );
+            } else {
+              locationFailures.add(
+                  StringUtils.format(
+                      "location[%s]: max[%,d] available[%,d]",

Review Comment:
   [P2] Free-space failures are reported as capacity failures
   
   When freeSpacePercent leaves insufficient physical disk space, reservation 
can fail even though configured available capacity is sufficient. This branch 
reports only max/available capacity and later claims the segment exceeded every 
location's capacity, misleading operators. Include the physical free-space 
constraint or distinguish the failure reason.



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