RussellSpitzer commented on code in PR #15670:
URL: https://github.com/apache/iceberg/pull/15670#discussion_r3016681217


##########
spark/v4.1/spark/src/main/java/org/apache/iceberg/spark/source/AsyncSparkMicroBatchPlanner.java:
##########
@@ -90,10 +89,13 @@ class AsyncSparkMicroBatchPlanner extends 
BaseSparkMicroBatchPlanner implements
     this.minQueuedRows = readConf().maxRecordsPerMicroBatch();
     this.lastOffsetForTriggerAvailableNow = lastOffsetForTriggerAvailableNow;
     this.planFilesCache = 
Caffeine.newBuilder().maximumSize(PLAN_FILES_CACHE_MAX_SIZE).build();
-    this.queue = new LinkedBlockingQueue<>();
+    this.queue = new LinkedBlockingDeque<>();
 
     table().refresh();
-    // Synchronously add data to the queue to meet our initial constraints
+
+    // Synchronously add data to the queue to meet our initial constraints.
+    // For Trigger.AvailableNow, constructor-time preload is normally 
initialized from
+    // latestOffset(...) with no explicit end offset, so bounded preload must 
stop at the cap.

Review Comment:
   i'm not sure I understand this comment, what is the cap?



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