We recently upgraded three elasticsearch clusters from 0.20.2 to 1.1.1 in one big step.
We did it without any downtime by setting up parallel clusters running 1.1.1. Since our data is changing all the time we created the parallel clusters by first adding machines and shards to the existing clusters and then we manually cut off the extra machines, renamed the cluster and started them and we have a complete copy of our existing system. We only had to pause updates to the clusters for a couple of hours while rewiring some logic, and reading never stopped. -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/elasticsearch/1d52a48d-d6b0-43c7-ac1b-62fe629c390f%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
