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Do not restart cluster when scaling up #4964

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Do not restart cluster when scaling up #4964

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1f18573
k8s: use dedicated method to compute old conf hash
alenkacz May 27, 2022
e46291c
k8s: ignore seed_servers field when computing config hash
alenkacz May 28, 2022
1f2496c
k8s: add integration test for scaling up
alenkacz May 30, 2022
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6 changes: 3 additions & 3 deletions src/go/k8s/pkg/resources/configmap_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -104,7 +104,7 @@ func TestEnsureConfigMap_AdditionalConfig(t *testing.T) {
name: "Primitive object in additional configuration",
additionalConfiguration: map[string]string{"redpanda.transactional_id_expiration_ms": "25920000000"},
expectedStrings: []string{"transactional_id_expiration_ms: 25920000000"},
expectedHash: "0cb36f0be0d64032a61eb51a5d2985ea",
expectedHash: "66339723e4a05fd6ddf0c69a1c21ef50",
},
{
name: "Complex struct in additional configuration",
Expand All @@ -114,15 +114,15 @@ func TestEnsureConfigMap_AdditionalConfig(t *testing.T) {
- address: 0.0.0.0
port: 8081
name: external`},
expectedHash: "4697714fe9b8f8bcaebb814b93f2b8f6",
expectedHash: "13f15bd68fe224846f532c29a10eb3b0",
},
{
name: "shadow index cache directory",
expectedStrings: []string{
`cloud_storage_cache_directory: /var/lib/shadow-index-cache`,
`cloud_storage_cache_size: "10737418240"`,
},
expectedHash: "2f51e71fa4b673fb105f98cb09cb7a00",
expectedHash: "27a43c846e6c990e60307fb3b88f91c4",
},
}
for _, tc := range testcases {
Expand Down
8 changes: 8 additions & 0 deletions src/go/k8s/pkg/resources/configuration/configuration.go
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Expand Up @@ -120,6 +120,7 @@ func (c *GlobalConfiguration) GetNodeConfigurationHash() (string, error) {
clone := *c
// clean any cluster property from config before serializing
clone.ClusterConfiguration = nil
removeIgnoredFields(&clone)
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I think probably we don't need to clone the object, but the code above seems to suggest we do a deep copy, while in practice it's doing a shallow one and the object is probably being modified

props := clone.NodeConfiguration.Redpanda.Other
clone.NodeConfiguration.Redpanda.Other = make(map[string]interface{})
for k, v := range props {
Expand All @@ -139,6 +140,7 @@ func (c *GlobalConfiguration) GetNodeConfigurationHash() (string, error) {
// is default behavior prior to centralized configuration feature was developed
func (c *GlobalConfiguration) GetAllConfigurationHash() (string, error) {
clone := *c
removeIgnoredFields(&clone)
serialized, err := clone.Serialize()
if err != nil {
return "", err
Expand All @@ -147,6 +149,12 @@ func (c *GlobalConfiguration) GetAllConfigurationHash() (string, error) {
return fmt.Sprintf("%x", md5Hash), nil
}

func removeIgnoredFields(clone *GlobalConfiguration) {
// ignore seeds for hash computation so that changes in this field don't
// trigger cluster restats
clone.NodeConfiguration.Redpanda.SeedServers = []config.SeedServer{}
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I think there are other cases where we iterate over the replicas to create urls, such as for panda proxy and schema registry

}

// GetAdditionalRedpandaProperty retrieves a configuration option
func (c *GlobalConfiguration) GetAdditionalRedpandaProperty(
prop string,
Expand Down
21 changes: 21 additions & 0 deletions src/go/k8s/pkg/resources/configuration/configuration_test.go
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Expand Up @@ -14,6 +14,7 @@ import (
"testing"

"github.com/redpanda-data/redpanda/src/go/k8s/pkg/resources/configuration"
rpkcfg "github.com/redpanda-data/redpanda/src/go/rpk/pkg/config"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
Expand Down Expand Up @@ -123,3 +124,23 @@ func TestStringSliceProperties(t *testing.T) {
})
}
}

func TestHash_SeedServersNoHashChange(t *testing.T) {
cfg := configuration.For("v22.1.1-test")
cfg.NodeConfiguration.Redpanda.SeedServers = []rpkcfg.SeedServer{}
nodeConfHash, err := cfg.GetNodeConfigurationHash()
require.NoError(t, err)
allConfHash, err := cfg.GetAllConfigurationHash()
require.NoError(t, err)

cfg.NodeConfiguration.Redpanda.SeedServers = []rpkcfg.SeedServer{{Host: rpkcfg.SocketAddress{Address: "redpanda.com", Port: 9090}}}
nodeConfHashNew, err := cfg.GetNodeConfigurationHash()
require.NoError(t, err)
allConfHashNew, err := cfg.GetAllConfigurationHash()
require.NoError(t, err)

// seed servers should not change hash to not require restart (e.g. when
// scaling up/down cluster)
require.Equal(t, allConfHash, allConfHashNew, "all conf")
require.Equal(t, nodeConfHash, nodeConfHashNew, "node conf")
}