Hi all, I'm micro-testing a simple update pattern (key + short json document) on my local workstation (8 core intel CPU, 8 gig of RAM, 10K disk) to get baseline before moving to cluster on AWS. With Riak I get about 60 mods/s before maxing out (as compared to approx 3000 mods/s on a vanilla MySQL using exactly the same code).
It feels like I must be doing something hideously wrong. (For the record, I'm a decent Java programmer but a riak/erlang n00b). Riak is installed via a vanilla Ununtu 12.04 package as described in the docs. The test ran on the same disk as the mentioned MySQL test. The same Java code was doing both tests (just a DAO swapped). The bucket was using n_val = 1. The problem seems to be in high disk-writing, despite the low load. Here's what iostat says during the run: [...] wrqm/s : 434.50 w/s: 182.90 wkB/s: 2618.00 avgrq-sz: 28.63 [...] %util: 10.60 Which seems to be too much considering the small load (the stored JSON blobs are roughly 1K each). I'm using the official PB Java client. This is an evaluation for a customer. Any hint of what I'm missing or what the problem could be would be appreciated. Cheers /Lars J. Nilsson Executive VP, Cubeia Ltd +46 (0) 704 / 10 69 53
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