Mapper和Reducer还有Job.set中的数据类型关系是什么？
Mapper<Object, Text, IntWritable, IntWritable> Reducer<IntWritable, IntWritable, NullWritable, IntWritable> job.setOutputKeyClass(I…
如何读出Hadoop SequenceFile里面的图片？
首先我是这样将图片打包进SequenceFile的： FSDataInputStream in = null in = fs.open(new Path(uri)) //uri is the image location in HDFS byte b…
