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

    https://github.com/apache/flink/pull/5465#discussion_r169100675
  
    --- Diff: 
flink-contrib/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBMapState.java
 ---
    @@ -400,7 +410,7 @@ public UV setValue(UV value) {
        /** An auxiliary utility to scan all entries under the given key. */
        private abstract class RocksDBMapIterator<T> implements Iterator<T> {
     
    -           static final int CACHE_SIZE_BASE = 1;
    +           static final int CACHE_SIZE_BASE = 32;
    --- End diff --
    
    Why is 32 the magic value and not 16 or 64? Just asking :)


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