@Override
  public TableBuilderBase setRequestAttribute(String key, byte[] value) {
    if (this.requestAttributes.isEmpty()) {
      this.requestAttributes = new HashMap<>();
    }
    this.requestAttributes.put(key, value);
    return this;
  }
Base class for all table builders.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/TableBuilderBase.java