public RocksDbTableDescriptor<K, V> withMaxFileOpeningThreads(int maxFileOpeningThreads) {
    this.maxFileOpeningThreads = maxFileOpeningThreads;
    return this;
  }
Sets the number of threads used to open DB files.
If max_open_files is -1, DB will open all files on DB::Open(). You can use this option to increase the number of
threads used to open files.
<p>
Default is 16.
<p>
@param maxFileOpeningThreads The number of threads to use when opening DB files.
@return the table descriptor instance
samza-kv-rocksdb/src/main/java/org/apache/samza/storage/kv/descriptors/RocksDbTableDescriptor.java