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java.lang.UnsupportedOperationException: 	at java.util.Collections$UnmodifiableCollection.clear(Collections.java:1094)	at io.confluent.connect.hdfs.DataWriter.onPartitionsAssigned(DataWriter.java:207)	at io.confluent.connect.hdfs.HdfsSinkTask.onPartitionsAssigned(HdfsSinkTask.java:103)	at org.apache.kafka.connect.runtime.WorkerSinkTask$HandleRebalance.onPartitionsAssigned(WorkerSinkTask.java:369)	at org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.onJoinComplete(ConsumerCoordinator.java:189)	at org.apache.kafka.clients.consumer.internals.AbstractCoordinator.ensureActiveGroup(AbstractCoordinator.java:227)	at org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.ensurePartitionAssignment(ConsumerCoordinator.java:306)	at org.apache.kafka.clients.consumer.KafkaConsumer.pollOnce(KafkaConsumer.java:861)	at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:829)	at org.apache.kafka.connect.runtime.WorkerSinkTask.poll(WorkerSinkTask.java:171)	at org.apache.kafka.connect.runtime.WorkerSinkTaskThread.iteration(WorkerSinkTaskThread.java:90)	at org.apache.kafka.connect.runtime.WorkerSinkTaskThread.execute(WorkerSinkTaskThread.java:58)	at org.apache.kafka.connect.util.ShutdownableThread.run(ShutdownableThread.java:82)