OpenStack: Support newer, more scalable version of etcd server #7147
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etcd prior to v3.4.20 had a scalability bug that limited the number of possible simultaneous client watches, and hence the maximum number of cluster nodes in a Calico+OpenStack installation. Hence we'd like to support etcd v3.4.20 and later. However, etcd v3.4 only supports URL paths with '/v3beta/' or '/v3/', and not the '/v3alpha/' that is hardcoded in our documented version of the etcd3gw package (previously known as etcd3-gateway). Hence we also need to: - document using a newer etcd3gw that supports the newer URL paths, namely version 1.0.1 - add a Calico config option to control that (bearing in mind that etcd3gw's default is still '/v3alpha/', and that some users might still be using older etcd servers, and so we can't just hardcode a newer setting).
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Please see projectcalico/calico#7147 for more detail.
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Please see projectcalico/calico#7147 for more detail.
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Description
etcd prior to v3.4.20 had a scalability bug that limited the number of possible simultaneous client watches, and hence the maximum number of cluster nodes in a Calico+OpenStack installation. Hence we'd like to support etcd v3.4.20 and later.
However, etcd v3.4 only supports URL paths with '/v3beta/' or '/v3/', and not the '/v3alpha/' that is hardcoded in our documented version of the etcd3gw package (previously known as etcd3-gateway). Hence we also need to:
document using a newer etcd3gw that supports the newer URL paths, namely version 1.0.1
add a Calico config option to control that (bearing in mind that etcd3gw's default is still '/v3alpha/', and that some users might still be using older etcd servers, and so we can't just hardcode a newer setting).
Release Note