aweisberg commented on code in PR #4111:
URL: https://github.com/apache/cassandra/pull/4111#discussion_r2122019667


##########
src/java/org/apache/cassandra/service/accord/txn/TxnQuery.java:
##########
@@ -217,6 +217,9 @@ public Result compute(TxnId txnId, Timestamp executeAt, 
Seekables<?, ?> keys, @N
                 
ClientRequestsMetricsHolder.accordWriteMetrics.accordMigrationRejects.mark();
             else
                 
ClientRequestsMetricsHolder.accordReadMetrics.accordMigrationRejects.mark();
+            // Prevent writes from being applied
+            if (update != null)
+                ((TxnUpdate)update).failCondition();

Review Comment:
   It should be deterministic. Live migration is predicated on this being true. 
That said the checks `TxnQuery` still needs to be updated to be done using the 
information from the actual epoch rather than the arbitrary current epoch.



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