August 2015
Intermediate to advanced
278 pages
5h 54m
English
Content preview from Learning YARNBecome 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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Monitoring NodeManager's health
NodeManager is a per-node daemon running on all the slave nodes of the cluster. All the NodeManager nodes are worker nodes that perform application execution. For efficient scheduling, it is important for the ResourceManager to monitor the health of these nodes. Health may include memory, CPU, network usage, and so on. The ResourceManager daemon will not schedule any new application execution requests to an unhealthy NodeManager.
The health checker script
YARN defines a mechanism to monitor health of a node using a script. An administrator needs to define a shell script to monitor the node. If the script returns ERROR as the first word in any of the output lines, then the ResourceManager marks the node as UNHEALTHY ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.