fix(journal): retry read on empty tag

src/journal/src/Journal/Internal/BufferClaim.hs

@@ -31,6 +31,7 @@ commit :: BufferClaim -> Logger -> IO ()
 commit (BufferClaim bb) logger = do
   let Capacity frameLen = getCapacity bb
   logg logger ("commit, frameLen: " ++ show frameLen)
+  writeFrameType bb 0 Valid
   writeFrameLength bb 0 (HeaderLength (int2Int32 frameLen))
 
 abort :: BufferClaim -> IO ()

src/journal/src/Journal/MP.hs

@@ -90,7 +90,7 @@ readJournal jour = do
         readJournal jour
       else readJournal jour -- If len is negative then the writer hasn't
                             -- finished writing the padding yet.
-    else if len <= 0
+    else if len <= 0 || tag == Empty
          then readJournal jour
          else do
            assertMMsg (show len) (len > 0)