hive process stuck at HashMap

[Haitao Yao]

hi, all
        today we found one of our hive process stuck , all the threads are 
stopped at  ava.util.HashMap.getEntry(HashMap.java:347),  here's the stack(full 
stack log is attached):

        "Thread-903" prio=10 tid=0x00002aaab8200000 nid=0x2838 runnable 
[0x000000004261b000]
   java.lang.Thread.State: RUNNABLE
        at java.util.HashMap.getEntry(HashMap.java:347)
        at java.util.HashMap.containsKey(HashMap.java:335)
        at java.util.HashSet.contains(HashSet.java:184)
        at 
org.apache.hadoop.hive.ql.QueryPlan.updateCountersInQueryPlan(QueryPlan.java:308)
        at org.apache.hadoop.hive.ql.QueryPlan.getQueryPlan(QueryPlan.java:424)
        
        the cpu usage is very high, 


        hive release: 0.8.1

        Is there any bugs here? 

        thanks

jstack.23806.log
Description: Binary data