Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/4668#discussion_r138876371
  
    --- Diff: 
flink-runtime/src/main/java/org/apache/flink/runtime/operators/util/BitSet.java 
---
    @@ -56,8 +56,7 @@ public void setMemorySegment(MemorySegment memorySegment, 
int offset) {
         * @param index - position
         */
        public void set(int index) {
    -           Preconditions.checkArgument(index < bitLength && index >= 0, 
    -                   String.format("Input Index[%d] is larger than BitSet 
available size[%d].", index, bitLength));
    +           Preconditions.checkArgument(index < bitLength && index >= 0);
    --- End diff --
    
    Just noticed your reply to the same comment on the JIRA issue. You are of 
course right, the varargs will create and fill an array which adds overhead.
    
    So +1 to keep it as it is.


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