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分享org.apache.hadoop.io.BytesWritable.Comparator 源码阅读
public static class Comparator extends WritableComparator {
public Comparator() {
super(BytesWritable.class);
}
/**
* Compare the buffers in serialized form.
*/
@Override
public int compare(byte[] b1, int s1, int l1,
byte[] b2, int s2, int l2) {
return compareBytes(b1, s1+LENGTH_BYTES, l1-LENGTH_BYTES,
b2, s2+LENGTH_BYTES, l2-LENGTH_BYTES);
}
}
比较时前后为什么要去掉四个字节呢？？请大神指教
public Comparator() {
super(BytesWritable.class);
}
/**
* Compare the buffers in serialized form.
*/
@Override
public int compare(byte[] b1, int s1, int l1,
byte[] b2, int s2, int l2) {
return compareBytes(b1, s1+LENGTH_BYTES, l1-LENGTH_BYTES,
b2, s2+LENGTH_BYTES, l2-LENGTH_BYTES);
}
}
比较时前后为什么要去掉四个字节呢？？请大神指教
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