/** * This is only visible because * {@link org.apache.flink.streaming.runtime.operators.GenericWriteAheadSink} uses the * checkpoint stream factory to write write-ahead logs. <b>This should not be used for * anything else.</b> */ public CheckpointStreamFactory createCheckpointStreamFactory(StreamOperator<?> operator) throws IOException { return stateBackend.createStreamFactory( getEnvironment().getJobID(), createOperatorIdentifier(operator, configuration.getVertexID())); }