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Documentation: describe the change of WAL entries related to auth

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Hitoshi Mitake
2020-07-09 00:27:37 +09:00
parent 5a3da48cdf
commit 2c41d9960b
2 changed files with 3 additions and 1 deletions
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Documentation/upgrades/upgrade_3_5.md
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@@ -14,6 +14,8 @@ Before [starting an upgrade](#upgrade-procedure), read through the rest of this
**NOTE:** When [migrating from v2 with no v3 data](https://github.com/etcd-io/etcd/issues/9480), etcd server v3.2+ panics when etcd restores from existing snapshots but no v3 `ETCD_DATA_DIR/member/snap/db` file. This happens when the server had migrated from v2 with no previous v3 data. This also prevents accidental v3 data loss (e.g. `db` file might have been moved). etcd requires that post v3 migration can only happen with v3 data. Do not upgrade to newer v3 versions until v3.0 server contains v3 data.
**NOTE:** If your cluster enables auth, rolling upgrade from 3.4 or older version isn't supported because 3.5 [changes a format of WAL entries related to auth](https://github.com/etcd-io/etcd/pull/11943).
Highlighted breaking changes in 3.5.
#### Deprecated `etcd_debugging_mvcc_db_total_size_in_bytes` Prometheus metrics