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how to dump tasktracker thread using java tool like jmap,jstack and so on?

Question asked by tony on Aug 17, 2014
how to dump tasktracker thread using java tool like jmap,jstack and so on?
when i dump it , the error as below
jdk1.6.0_29]# bin/jstack 25028
25028: Unable to open socket file: target process not responding or HotSpot VM not loaded
The -F option can be used when the target process is not responding

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