configuration over ENV

[Borzo-terrum]

Hi guys,

I use
greptimedb-operator - helm version 0.2.5
greptimedb-cluster - helm version 0.2.14

According to the documentation, I can set the settings using environment variables

Trying to set region_engine.mito.page_cache_size

GREPTIMEDB_DATANODE__REGION_ENGINE__MITO__PAGE_CACHE_SIZE

I get an error
datanode Error: 0: Failed to load layered config, at src/cmd/src/datanode.rs:152:10
datanode 1: Failed to load layered config, at /greptimedb/src/common/config/src/config.rs:79:14
datanode 2: invalid type: map, expected a sequence

Translated with www.DeepL.com/Translator (free version)

[zyy17]

We use config-rs to parse environment variables to config struct. Unfortunately, it doesn't support parsing struct list(The type of region_engine is list) from environment variable.

If you want to configure region_engine, you can use datanode.configData of greptimedb-cluster chart.

For example, you can create a values.yaml:

datanode:
  configData: |-
    [[region_engine]]
    [region_engine.mito]
    page_cache_size = "256MB"

Upgrade your cluster by the following command:

helm upgrade --install mycluster greptime/greptimedb-cluster --values ./values.yaml

We are considering extracting commonly used configurations to CRD fields that the user can configure easily without specifying environment variables or config data.

[Borzo-terrum]

thanks