mirror of
https://github.com/hanzoai/tasks.git
synced 2026-10-04 02:04:03 +00:00
Tim Deeb-SwihartandGitHub
be7b5514a5
## What changed? Both our PostgreSQL and MySQL database backends will now automatically reconnect to the database when certain errors occur: all errors chosen have been experienced when testing this behavior through an AWS Aurora RDS failover of either MySQL or PostgreSQL. For both backends we will reconnect when we see: - `ECONNRESET` - `ECONNABORTED` - `ECONNREFUSED` - `io.EOF` - `io.ErrUnexpectedEOF` - `database/sql/driver.ErrBadConn` for postgres we will also reconnect on the following SQLStates: - `25006` read-only transaction - `57P03` cannot connect now - `0A000` feature not supported, but ONLY when the message is `cannot set transaction read-write mode during recovery` for mysql we will also reconnect when we see the following error codes: - `1040` too many connections - `1792` read-only transaction (SQLstate `25006`) - `1836` running in read-only mode This logic is easily extensible should we discover more failure modes over time ## Why? We've had multiple community reports of Temporal problems during RDS failover. One part of this is the fact that we wouldn't necessarily reconnect; we were at the whims of our chosen SQL abstraction's connection pooling logic. ## How did you test it? I manually tested this functionality in the presence of repeated RDS failovers: - [x] postgres12 plugin with pq driver - [x] postgres12 plugin with pgx driver - [x] mysql plugin Automated testing will be added to our regular testing pipelines once our infrastructure friends have added the support I need (it's in progress) ## Potential risks We're concerned there's a correctness issue in our PostgreSQL backend that's related to our behavior during an RDS failover. If we merge this before I figure out what's going on, we could hide the issue and make it harder to reproduce. ## Documentation N/A ## Is hotfix candidate? Yes?
86 lines
2.6 KiB
Go
86 lines
2.6 KiB
Go
// The MIT License
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//
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// Copyright (c) 2020 Temporal Technologies Inc. All rights reserved.
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//
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// Copyright (c) 2020 Uber Technologies, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package sql
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import (
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"go.temporal.io/server/common/config"
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"go.temporal.io/server/common/log"
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"go.temporal.io/server/common/metrics"
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"go.temporal.io/server/common/persistence/sql/sqlplugin"
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"go.temporal.io/server/common/resolver"
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)
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// VerifyCompatibleVersion ensures that the installed version of temporal and visibility
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// is greater than or equal to the expected version.
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func VerifyCompatibleVersion(
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cfg config.Persistence,
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r resolver.ServiceResolver,
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) error {
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if err := checkMainDatabase(cfg, r); err != nil {
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return err
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}
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if cfg.VisibilityConfigExist() {
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return checkVisibilityDatabase(cfg, r)
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}
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return nil
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}
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func checkMainDatabase(
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cfg config.Persistence,
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r resolver.ServiceResolver,
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) error {
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ds, ok := cfg.DataStores[cfg.DefaultStore]
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if ok && ds.SQL != nil {
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return checkCompatibleVersion(ds.SQL, r, sqlplugin.DbKindMain)
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}
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return nil
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}
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func checkVisibilityDatabase(
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cfg config.Persistence,
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r resolver.ServiceResolver,
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) error {
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ds, ok := cfg.DataStores[cfg.VisibilityStore]
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if ok && ds.SQL != nil {
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return checkCompatibleVersion(ds.SQL, r, sqlplugin.DbKindVisibility)
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}
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return nil
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}
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func checkCompatibleVersion(
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cfg *config.SQL,
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r resolver.ServiceResolver,
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dbKind sqlplugin.DbKind,
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) error {
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db, err := NewSQLAdminDB(dbKind, cfg, r, log.NewNoopLogger(), metrics.NoopMetricsHandler)
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if err != nil {
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return err
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}
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defer func() { _ = db.Close() }()
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return db.VerifyVersion()
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}
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