October 2017
Intermediate to advanced
340 pages
9h 46m
English
Content preview from Learning Ceph - Second Edition
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CRUSH Lookup
Any client that intends to issue reads or writes to the cluster needs to perform a lookup operation to know where the objects in question belong.
If the client doesn't have a current CRUSH map, for example when performing the first operations of a new run, it connects to one of the cluster's monitor nodes to request the latest CRUSH map. This map contains the state, topology, and configuration of the cluster. Each object is run through a fast hashing function then a bitmask is applied to ensure that the mapping function's range aligns with the key space dictated by the number of PGs in the pool. This is essentially a modulo operation. ...
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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.