HBASE-11083 allows ExportSnapshot to limit bandwidth usage.
Here is one approach for backporting:
Create the following classes (class name is tentative):
each of which extends the corresponding ThrottledInputStream in hadoop-1 / hadoop-2
ExportSnapshot would reference util.ThrottledInputStream, depending on which compatibility module gets bundled.
ThrottledInputStream.java in hadoop-1 branch was backported through
MAPREDUCE-5081 which went into 1.2.0 release.
We need to decide how hadoop releases earlier than 1.2.0 should be supported.
Second approach for backporting is to make a copy of ThrottledInputStream and include it in hbase codebase.