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Hadoop >> mail # user >> datanode is slow


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datanode is slow
I use Hbase0.94 and CDH4. There are 25729 tcp connections in one
machine,example:
hadoop@apayhbs081 ~ $ netstat -a | wc -l
25729

The linux configration is :
       soft    core            0
       hard    rss             10000
       hard    nproc           20
       soft    nproc           20
       hard    nproc           50
       hard    nproc           0
       maxlogins       4
       nproc          20480
        nofile         204800
When there are 25729 tcp connections in one machine, the datanode is very
slow.
How can I resolve the question?