Refactoring

application/src/main/java/org/thingsboard/server/service/edge/rpc/fetch/GeneralEdgeEventFetcher.java

@@ -36,7 +36,9 @@ public class GeneralEdgeEventFetcher implements EdgeEventFetcher {
     private boolean seqIdNewCycleStarted;
     private Long maxReadRecordsCount;
     private final EdgeEventService edgeEventService;
-    // Subtract from queueStartTs to ensure no data is lost due to potential misordering of edge events by created_time.
+    // Subtract from queueStartTs to compensate for possible misalignment between `created_time` and `seqId`.
+    // This ensures early events with lower seqId are not skipped due to partitioning by `created_time`.
+    // See: edge_event is partitioned by created_time but sorted by seqId during retrieval.
     private final long misorderingCompensationMillis;
 
     @Override

application/src/main/resources/thingsboard.yml

@@ -1480,8 +1480,10 @@ edges:
     no_read_records_sleep: "${EDGES_NO_READ_RECORDS_SLEEP:1000}"
     # Number of milliseconds to wait before resending failed batch of edge events to edge
     sleep_between_batches: "${EDGES_SLEEP_BETWEEN_BATCHES:60000}"
-    # Number of milliseconds to subtract from queue start timestamp to compensate for potential
+    # Time (in milliseconds) to subtract from the start timestamp when fetching edge events.
-    # misordering of edge events by created_time. Prevents skipping early events.
+    # This compensates for possible misordering between `created_time` (used for partitioning)
+    # and `seqId` (used for sorting). Without this, events with smaller seqId but larger created_time
+    # might be skipped, especially across partition boundaries.
     misordering_compensation_millis: "${EDGES_MISORDERING_COMPENSATION_MILLIS:3600000}"
   # Max number of high priority edge events per edge session. No persistence - stored in memory
   max_high_priority_queue_size_per_session: "${EDGES_MAX_HIGH_PRIORITY_QUEUE_SIZE_PER_SESSION:10000}"