Thanks a lot Christian :) I had not meant by any mean last Friday to overload the cluster ... I did it nonetheless. Your page on how to 'keep an eye on it' will really be useful! Cheers Joseph
On Sun, Mar 8, 2015 at 8:26 PM, Leila Zia leila@wikimedia.org wrote:
This is really useful, Christian. Thanks for explaining and documenting it.
Leila
On Sat, Mar 7, 2015 at 6:14 AM, Christian Aistleitner < christian@quelltextlich.at> wrote:
Hi,
around running jobs on the Analytics cluster, I've sometime seen people say in IRC: “Let's run this heavy job. I'll keep an eye on it”.
But more often than not, this seems to have meant: “Let's just run this heavy job and wait. If QChris joins IRC, let's hope he doesn't ping us about having overloaded the cluster.”
That's not nice^Wscalable ;-)
So just in case someone is vague on how to “keep an eye on it”, I did a short write-up at:
https://wikitech.wikimedia.org/wiki/Analytics/Cluster/Hadoop/Load
which details on detecting how the cluster is doing on a very high level. Especially, it allows you to detect if the cluster got stalled, and if it did, it tells you what to do.
Have fun, Christian
P.S.: The above URL has diagrams! Click the URL!
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