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From ch huang <justlo...@gmail.com>
Subject about hadoop memory usage
Date Wed, 20 Nov 2013 06:50:53 GMT
hi,all:
       if i allocate 2G memory to NN, and i get memory usage info from jmx
interface ,i add the max value of heapmemoryusage and nonheapmemorusage
,the total number is not equal 2G ,the value is 1950.5M ,why? ,BTW ,what's
the "committed" and "init" means?


  "HeapMemoryUsage" : {
      "committed" : 312344576,
      "init" : 258443648,
      "max" : 1908932608,
      "used" : 36133888
    },
    "NonHeapMemoryUsage" : {
      "committed" : 30408704,
      "init" : 24313856,
      "max" : 136314880,
      "used" : 29665296
    },

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