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2017-03-21 10:29:27 0 举报Hadoop自带Writable类层次结构
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AbstractMapWritable
BooleanWritable
LongWritable
org.apache.hadoop.io.Writable
+ write (DataOutput out) : void+ readFields (DataInput in) : void
ByteWritable
Text
DoubleWritable
org.apache.hadoop.io.WritableComparable
IntWritable
TwoDArrayWritable
MD5Hash
ArrayWritable
VIntWritable
NullWritable
SortedMapWritable
VLongWritable
primitives
BytesWritable
other
GenericWritable
MapWritable
ObjectWritable
FloatWritable
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