public Builder clearHdfsDataSource() {
        if (hdfsDataSourceBuilder_ == null) {
          if (dataSourceCase_ == 20) {
            dataSourceCase_ = 0;
            dataSource_ = null;
            onChanged();
          }
        } else {
          if (dataSourceCase_ == 20) {
            dataSourceCase_ = 0;
            dataSource_ = null;
          }
          hdfsDataSourceBuilder_.clear();
        }
        return this;
      }
<pre>
An HDFS cluster data source.
</pre>

<code>.google.storagetransfer.v1.HdfsData hdfs_data_source = 20;</code>
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java