什么＆＃34; vcore-seconds＆＃34;在hadoop工作日志意味着什么？

Question

Job Counters
    Launched map tasks=3
    Launched reduce tasks=45
    Data-local map tasks=1
    Rack-local map tasks=2
    Total time spent by all maps in occupied slots (ms)=29338
    Total time spent by all reduces in occupied slots (ms)=200225
    Total time spent by all map tasks (ms)=29338
    Total time spent by all reduce tasks (ms)=200225
    Total vcore-seconds taken by all map tasks=29338
    Total vcore-seconds taken by all reduce tasks=200225
    Total megabyte-seconds taken by all map tasks=30042112
    Total megabyte-seconds taken by all reduce tasks=205030400

＆＃34; vcore-seconds＆＃34;是什么意思和＆＃34; vcore-seconds＆＃34;和＆＃34;花费的总时间＆＃34;

Answer 1

没有关于此指标的官方文档，但如果我理解正常（see here），则vcore-seconds是Hadoop为某些任务分配vcore的秒数之和。

我认为此度量标准显示MapReduce应用程序在Map和Reduce阶段花费了多少时间，而不涉及其他任务（计划任务，随机播放和排序中间键等等）