Back in 2018, now five years ago, we published a blog post describing our 400+ node Elasticsearch cluster. In that post we brought up an important topic: So far, we have elected to not upgrade the cluster. We would like to, but so far there have been more urgent tasks. How we...
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How we upgraded an old, 3PB large, Elasticsearch cluster without downtime. Part 2 - Two consistent clusters
This is part 2 in our series on how we upgraded our Elasticsearch cluster without downtime and minimal user impact. As described in Part 1, our requirements were to both provide a smooth transition between two different versions of our system, while still keeping the opportunities for a rollback open. With that in mind it was obvious from the beginning... Read the story