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A comment on Ubuntu 16.04: “Out of memory” errors after upgrade to 4.4.0-59. Parent comment

Re:Ubuntu 16.04: “Out of memory” errors after upgrade to 4.4... by eikenberry on Sunday January 29, 2017 @04:54AM (#13513388)
> [...] a bit of swap can really save you some problems.

And cause a bunch more. Have you ever had to debug a race that is only triggered when a process hits swap. Not fun at all.

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Re:Ubuntu 16.04: “Out of memory” errors after upgrade to 4.4... by sscarduzio on Sunday January 29, 2017 @06:43AM (#13513694)
Yes I did, and the swappy machine started responding just a tad too slowly to other nodes' pings, engaging into a loop of join/parting the cluster, causing replication to kick in all the time and a whole "highly available" critical cluster of 9 nodes was unable to handle traffic (too busy replicating) causing millions in losses. So yeah, don't use swap in servers.

Ironically, if the node had crashed for OoM, the cluster would have survived just fine.

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