dlmarion commented on code in PR #6146:
URL: https://github.com/apache/accumulo/pull/6146#discussion_r2848936760


##########
server/tserver/src/main/java/org/apache/accumulo/tserver/ScanServer.java:
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@@ -477,6 +488,77 @@ public void run() {
     }
   }
 
+  // Visible for testing
+  protected boolean isAllowed(TableId tid) {
+    Boolean result = allowedTables.get(tid);
+    if (result == null) {
+      // Clear the cache and try again, maybe there
+      // is a race condition in table creation and
+      // scan
+      updateAllowedTables(true);
+      result = allowedTables.get(tid);

Review Comment:
   What type of exception do you think should be propagated back to the client? 
ScanServerBusy so that it tries another server?
   



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