如题，flink在使用StreamingFileSink是报错：
java.lang.UnsupportedOperationException: Recoverable writers on Hadoop are only supported for HDFS and for Hadoop version 2.7 or newer
at org.apache.flink.runtime.fs.hdfs.HadoopRecoverableWriter.<init>(HadoopRecoverableWriter.java:57)
at org.apache.flink.runtime.fs.hdfs.HadoopFileSystem.createRecoverableWriter(HadoopFileSystem.java:202)
at org.apache.flink.core.fs.SafetyNetWrapperFileSystem.createRecoverableWriter(SafetyNetWrapperFileSystem.java:69)
at org.apache.flink.streaming.api.functions.sink.filesystem.Buckets.<init>(Buckets.java:112)
at org.apache.flink.streaming.api.functions.sink.filesystem.StreamingFileSink$RowFormatBuilder.createBuckets(StreamingFileSink.java:242)
at org.apache.flink.streaming.api.functions.sink.filesystem.StreamingFileSink.initializeState(StreamingFileSink.java:327)
at org.apache.flink.streaming.util.functions.StreamingFunctionUtils.tryRestoreFunction(StreamingFunctionUtils.java:178)
at org.apache.flink.streaming.util.functions.StreamingFunctionUtils.restoreFunctionState(StreamingFunctionUtils.java:160)
at org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.initializeState(AbstractUdfStreamOperator.java:96)
at org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:281)
at org.apache.flink.streaming.runtime.tasks.StreamTask.initializeState(StreamTask.java:878)
at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:392)
at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:705)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:530)
at java.lang.Thread.run(Thread.java:748)
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原文链接：https://blog.csdn.net/u013220482/article/details/100901471
出现以上问题是因为flink-hadoop的驱动包版本太低。替换掉flink lib目录下面的flink-shaded-hadoop-2-uber-*.jar。选择版本大于2.7的驱动包。如图：
