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Important

Helios features are now enabled during weekly update windows and are no longer directly tied to SingleStore engine releases. Refer to the release notes to view the latest features available in your Helios cluster.

SET LEAF

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The SET LEAF command sets a sync variable to propagate to all leaves in the cluster.

Syntax

SET LEAF variable_name = value

Arguments

  • variable_name: name of the sync variable.

  • value: value to be assigned to the sync variable.

Remarks

  • variable_name must be a sync variable that can sync to all nodes (aggregators and leaves).

  • You cannot this command on a non-sync variable.

  • This command must be run on the master aggregator.

Examples

Example 1

The following example syncs the variable regexp_format to all leaves. SET LEAF can be run on regexp_format because regexp_format is a variable that can sync to all nodes (leaves and aggregators).

SET LEAF regexp_format = "extended";

Retrieve the variable’s value:

SELECT @@regexp_format;
+-----------------+
| @@regexp_format |
+-----------------+
| extended        |
+-----------------+

Example 2

The following example attempts to sync the variable auto_attach to all leaves. SET LEAF fails because auto_attach is a variable that can sync to all aggregators, only.

SET LEAF auto_attach = 1;
ERROR 2324 (HY000): This cluster-wide variable exists only on
aggregators, it's not possible to set a value for leaves

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Verification instructions

Note: You must install cosign to verify the authenticity of the SingleStore file.

Use the following steps to verify the authenticity of singlestoredb-server, singlestoredb-toolbox, singlestoredb-studio, and singlestore-client SingleStore files that have been downloaded.

You may perform the following steps on any computer that can run cosign, such as the main deployment host of the cluster.

  1. (Optional) Run the following command to view the associated signature files.

    curl undefined

  2. Download the signature file from the SingleStore release server.

    • Option 1: Click the Download Signature button next to the SingleStore file.

    • Option 2: Copy and paste the following URL into the address bar of your browser and save the signature file.

    • Option 3: Run the following command to download the signature file.

      curl -O undefined

  3. After the signature file has been downloaded, run the following command to verify the authenticity of the SingleStore file.

    echo -n undefined |
        cosign verify-blob --certificate-oidc-issuer https://oidc.eks.us-east-1.amazonaws.com/id/CCDCDBA1379A5596AB5B2E46DCA385BC \
          --certificate-identity https://kubernetes.io/namespaces/freya-production/serviceaccounts/job-worker \
          --bundle undefined \
          --new-bundle-format -
    Verified OK

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