Problem which is not close socket on hive

gistfile1.txt

Environment:
 CentOS 5.8 x64
 CDH3u4
   hadoop-0.20-0.20.2+923.256-1
   hadoop-0.20-{namenode,secondarynamenode,jobtracker,tasktracker,daanode}-0.20.2+923.256-1
   hadoop-0.20-conf-pseudo-0.20.2+923.256-1(but same error was occurred on not pseudo env)
 apache hive-0.8.1(but same error was occurred on hive 0.9)

Procedure for reproduction:
 1. Set up hadoop
 2. Prepare data file and link.txt:
    data:
      $ hadoop fs -cat /path/to/data/2012-07-01/20120701.csv 
      1, 20120701 00:00:00
      2, 20120701 00:00:01
      3, 20120701 01:12:45
    link.txt
      $ cat link.txt
       /path/to/data/2012-07-01//*

 2. On hive, create table like below:
   CREATE TABLE user_logs(id INT, created_at STRING) 
   row format delimited fields terminated by ',' lines terminated by '\n' 
   stored as inputformat 'org.apache.hadoop.hive.ql.io.SymlinkTextInputFormat' 
   outputformat 'org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat';

 3. Put link.txt to /user/hive/warehouse/user_logs

 4. Open another session(A session), and watch socket,
   $ netstat -a | grep CLOSE_WAIT
    tcp        1      0 localhost:48121             localhost:50010             CLOSE_WAIT  
    tcp        1      0 localhost:48124             localhost:50010             CLOSE_WAIT  
   $ 

 5. Return to hive session, execute this,
   $ select * from user_logs;
 
 6. Return to A session, watch socket again,
   $ netstat -a | grep CLOSE_WAIT
   tcp        1      0 localhost:48121             localhost:50010             CLOSE_WAIT
   tcp        1      0 localhost:48124             localhost:50010             CLOSE_WAIT
   tcp        1      0 localhost:48166             localhost:50010             CLOSE_WAIT

 If you makes any partitions, you'll watch unclosed socket whose count equals partitions by once.