jacek-lewandowski commented on a change in pull request #1276:
URL: https://github.com/apache/cassandra/pull/1276#discussion_r829149729



##########
File path: src/java/org/apache/cassandra/service/StartupChecks.java
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@@ -569,6 +586,14 @@ public FileVisitResult preVisitDirectory(Path dir, 
BasicFileAttributes attrs) th
                                                          "upgradesstables",
                                                          
Joiner.on(",").join(invalid)));
 
+            if (!withIllegalGenId.isEmpty())
+                throw new StartupException(StartupException.ERR_WRONG_CONFIG,
+                                           "UUID generation identifiers are 
disabled but some sstables have been " +
+                                           "created with UUID generation 
identifier. You have to either delete those " +
+                                           "sstables (if you are ok with 
loosing that data on this node, and then let " +
+                                           "the repair bring them back) or 
enabled UUID based generation identifers in " +

Review comment:
       I'll replace it with:
   
   ```java
                   throw new StartupException(StartupException.ERR_WRONG_CONFIG,
                                              "UUID generation identifiers are 
disabled but some sstables have been " +
                                              "created with UUID generation 
identifier. You have to either delete those " +
                                              "sstables or enabled UUID based 
generation identifers in cassandra.yaml " +
                                              
"(enable_uuid_generation_identifiers). The list of affected sstables is: " +
                                              Joiner.on(", 
").join(withIllegalGenId) + ". If you decide to delete sstables, " +
                                              "and have that data replicated 
over other healthy nodes, those will be brought" +
                                              "back during repair");
   ```




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