May 2017
Intermediate to advanced
348 pages
7h 8m
English
Content preview from Hadoop 2.x Administration CookbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Memory requirements
In this recipe, we will look at the memory requirements per node in the cluster, especially looking at the memory on Datanodes as a factor of storage.
Despite having large clusters with many Datanodes, it is of not much use if the nodes do not have sufficient memory to serve the requests. A Namenode stores the entire metadata in the memory and also has to take care of the block reports sent by the Datanodes in the cluster. The larger the cluster, the larger will be the block reports, and the more resources a Namenode will require.
The intent of this recipe is not to tune it for memory, but to give an estimate on the memory required per node.
Getting ready
To complete this recipe, the user must have completed the Disk space calculations ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.