CCAH-CCA-500-1題:What is the maximum amount of virtual memory allocated......

1. What is the maximum amount of virtual memory allocated for each map task before YARN will kill its Container?

Your cluster’s mapred-start.xml includes the following parameters

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<name>mapreduce.map.memory.mb</name>

<value>4096</value>

<name>mapreduce.reduce.memory.mb</name>

<value>8192</value>

And any cluster’s yarn-site.xml includes the following parameters

<name>yarn.nodemanager.vmen-pmen-ration</name>

<value>2.1</value>

What is the maximum amount of virtual memory allocated for each map task before YARN will kill its Container?

A. 4 GB         B. 17.2 GB        C. 8.9GB        D. 8.2 GB       E. 24.6 GB

問題:

  每個map任務,在運作時,虛拟記憶體能夠配置設定到多大時，就會被Yarn資料總管kill掉？

解析:

   參數yarn.nodemanager.vmen-pmen-ration ：

          是指每機關的實體記憶體總量對應的虛拟記憶體量，預設是2.1，表示每使用1MB的實體記憶體，最多可以使用2.1MB的虛拟記憶體總量。

是以map memory 目前設定是4096Mb,那麼vm的最大配置設定為(4096Mb*2.1)/1024Mb=8.4G,那麼接近答案的是D.