dlmarion commented on code in PR #5497:
URL: https://github.com/apache/accumulo/pull/5497#discussion_r2056312896


##########
server/tserver/src/main/java/org/apache/accumulo/tserver/log/LogSorter.java:
##########
@@ -274,12 +274,7 @@ void writeBuffer(String destPath, 
List<Pair<LogFileKey,LogFileValue>> buffer, in
       var logFileKey = pair.getFirst();
       var logFileValue = pair.getSecond();
       Key k = logFileKey.toKey();
-      var list = keyListMap.putIfAbsent(k, logFileValue.mutations);
-      if (list != null) {
-        var muts = new ArrayList<>(list);
-        muts.addAll(logFileValue.mutations);
-        keyListMap.put(logFileKey.toKey(), muts);
-      }
+      keyListMap.computeIfAbsent(k, (key) -> new 
ArrayList<>()).addAll(logFileValue.mutations);

Review Comment:
   Do we need to optimize for the single key case so as not to copy the 
mutations?



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