ivankelly commented on a change in pull request #898: Bookies should prioritize 
recovery reads/writes
URL: https://github.com/apache/bookkeeper/pull/898#discussion_r169886152

 File path: bookkeeper-proto/src/main/proto/BookkeeperProtocol.proto
 @@ -90,8 +90,9 @@ message ReadRequest {
     enum Flag {
         FENCE_LEDGER = 1;
         ENTRY_PIGGYBACK = 2;
+        HIGH_PRIORITY = 3;
-    optional Flag flag = 100;
+    repeated Flag flag = 100;
 Review comment:
   > hmm I think this changes too much for a portback. i know repeated field is 
compatible with optional. However I am not sure how it would impact other 
existing code logic. I don't feel comfortable with change, especially this is 
coupled with a portback change.
   The code changes required are forced by the change because the api for 
accessing repeated is completely different than that for accessing an optional.
   I agree with what you're saying though, I was actually expecting this to 
fail BC in CI as enums in protobuf don't take kindly to new additions, so I was 
surprised when it past. My contingency was to add something like you suggest, 
though a boolean. An int is a good idea though. I'll leave everything else the 
same with regards to BookieClient.

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