select and get duplicated records with hive when a .defalte file greater than 64MB was loaded to a hive table

we occasionally have some compressed file larger than 160MB in .deflate format. And it was load to hive using an external table, say table T_A.
when select count from T_A we got more records,70% more! compared with that we use "hadoop fs -text /xxxxx |wc -l" to check the file.
any clue for this? how could it happened?

the large .deflate file was due to imperfect processing , when we fixed it and get files less than 64M. the above problem did not come up. But since it is not guaranteed that a larger file would not show up again. is there any way to avoid this subject ?

cheers!
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