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public class StreamGraphHasherV2 implements StreamGraphHasher {

	private static final Logger LOG = LoggerFactory.getLogger(StreamGraphHasherV2.class);

	/**
	 * Returns a map with a hash for each {@link StreamNode} of the {@link
	 * StreamGraph}. The hash is used as the {@link JobVertexID} in order to
	 * identify nodes across job submissions if they didn't change.
	 *
	 * <p>The complete {@link StreamGraph} is traversed. The hash is either

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