< Marvin> the prefect worker is ready the work queue is read Prefect Community #ask-marvin

The status of a Prefect deployment being "not ready" can be caused by a few different issues: 1. Work Pool and Queue Issues: If the deployment is not properly associated with a work pool or the work pool is not in the correct state, it could lead to the deployment being unready. 2. Recent Deployment Updates: When a deployment is updated (e.g., to change the associated work pool), its status might temporarily change to unready. This behavior is discussed in PrefectHQ issue #12773. 3. Incorrect Status Updates: There have been issues where deployment statuses weren't being updated correctly, for example, when a work pool with a running worker didn't update a newly created deployment to READY. This issue is being tracked and fixed in PR PrefectHQ pull/14095. 4. Code Deviations in Deployment Status Handling: There was a reported discrepancy in the deployment status handling code compared to the cloud implementation. This issue was tracked in PrefectHQ pull/13921. For more detailed information, you can explore the following links: - Issue about adding deployment status events - Fix stale deployment statuses - Proposed code changes to fix deployment status behavior In summary, the "not ready" status can be attributed to updates in the deployment, incorrect status updates, or issues with the work pool and its queues. Ensuring that your work pool and queues are correctly set up and checking for any temporary update-related status changes should help in identifying and resolving the issue.

Dijar Vrella

07/07/2024, 2:08 PM

@Marvin when I run prefect deployment run I get creating flow run for deployment and then it says Block not found

Marvin

07/07/2024, 2:09 PM

The error message "Block not found" during

prefect deployment run

could be due to several issues related to the configuration and registration of blocks. Here are some key points to investigate: 1. Block Registration: Ensure that the block you are trying to use is properly registered. For example, if you have a custom block, it should be registered with Prefect before using it in a deployment:

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bash
   prefect block register --file <your_block_file>.py

2. Block Type Hint: An issue can arise if the flow uses a block as a parameter type hint but the parameters are not correctly populated. Check that the block parameters match what is expected by the flow. You can see a related issue in GitHub here. 3. Block Storage: Verify that the storage block referenced by the deployment exists and is properly configured. This can be particularly relevant when using storage options like S3 or GitLab that may require additional setup. 4. Deployment Configuration: Ensure the deployment configuration is correct and references valid blocks. For example:

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yaml
   name: <deployment_name>
   description: <description>
   version: <version>
   work_queue_name: <queue_name>
   tags: []
   parameters: {}
   schedule: null
   infra_overrides: {}
   storage: <storage_block_reference>
   infrastructure: <infrastructure_block_reference>

5. Block Existence Check: If the block does not exist or is misspelled in the deployment script, you will encounter this error. Double-check the block names and their existence in the Prefect UI or using CLI:

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bash
   prefect block ls

For more specifics, you can refer to the issues and discussions related to block-related errors: - Selecting and Invoking Flow Runs with Blocks - GitLab-Repository Class Unfindable Issue Summary: Verify block registration, configuration, and existence to ensure they are properly referenced in the deployment. Recheck the deployment YAML and block type hints used in your flow. Refer to related issues and documentation to address block-related errors.

Dijar Vrella

07/07/2024, 2:27 PM

@Marvin I have a worker job base template config which has this part configured: "registry_credentials": { "title": "Registry Credentials", "description": "Credentials for logging into a Docker registry to pull images from.", "allOf": [ { "$ref": "#/definitions/DockerRegistryCredentials" } ], "default": { "$ref": { "block_document_id": "e0e320a2-0bc0-4f9f-8fea-07a78985567c" } } How to make it block_document_id be dynamic or using some static name I configure for it?

Marvin

07/07/2024, 2:28 PM

To make the

block_document_id

dynamic or use a static name that you configure for it, you can adapt your configuration to reference the block by name rather than a hardcoded

block_document_id

. For instance, you might first create or ensure that you have a block with a known name, and then dynamically reference that block in your configuration. Here's an example of a Python script that shows how you can dynamically fetch block IDs by name and update the worker config accordingly:

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python
from prefect import flows
from prefect.blocks.core import Block

# Load a block using its name
def get_block_id_by_name(block_type: str, block_name: str) -> str:
    block = Block.load(block_type=block_type, name=block_name)
    return block.id

# Example usage, replace 'DockerRegistryCredentials' and 'my-docker-credentials' with your actual block type and name
block_id = get_block_id_by_name('DockerRegistryCredentials', 'my-docker-credentials')

# Updated worker base template config with dynamic block ID
worker_job_config = {
    "registry_credentials": {
        "title": "Registry Credentials",
        "description": "Credentials for logging into a Docker registry to pull images from.",
        "allOf": [
            {
                "$ref": "#/definitions/DockerRegistryCredentials"
            }
        ],
        "default": {
            "$ref": {
                "block_document_id": block_id
            }
        }
    }
}

print(worker_job_config)

In this script: 1. get_block_id_by_name
: A function that fetches the block ID based on the block type and name. 2. Dynamic Block ID Fetching: Replace

'DockerRegistryCredentials'

and

'my-docker-credentials'

with your actual block type and name. Alternatively, if you want to use a static name directly in your configuration you can replace the default block document reference with the static name. Prefect's configuration can dynamically resolve the block as long as the name is unique. Configure the worker base template config to look something like:

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yaml
registry_credentials:
  title: "Registry Credentials"
  description: "Credentials for logging into a Docker registry to pull images from."
  allOf:
    - $ref: "#/definitions/DockerRegistryCredentials"
  default:
    $ref:
      block_document_name: "my-docker-credentials"

This way, instead of referencing the block by its ID, it references it by name, making the configuration more flexible and easier to manage without needing to change hardcoded IDs. ### Summary: The approaches above ensure that your worker configuration remains dynamic, either by fetching and setting the block ID programmatically or by referencing the block using a static name in the configuration.

Dijar Vrella

07/07/2024, 2:34 PM

@Marvin how to set a default DockerRegistryCredentials, registry_credentials in worker base job template not to be using id but rather name?

Marvin

07/07/2024, 2:34 PM

To set a default

DockerRegistryCredentials

in a worker job template using a block name instead of an ID, you will need to adjust your configuration to dynamically resolve the block by name. Unfortunately, referencing blocks by name directly in YAML might not be straightforward, but you can achieve this programmatically, either through Prefect's API or inside your script. Here's how to approach it: ### Step 1: Load Block by Name Instead of hardcoding the block just by its ID in your configuration, you can fetch the block programmatically by its name. ### Example 1: Using Prefect's Python Interface

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python
from prefect.blocks.core import Block

# Load the block by name
docker_registry_credential = Block.load("DockerRegistryCredentials", name="my-docker-credentials")

# Get the block ID
block_id = docker_registry_credential.id

# Use this block_id in your worker configuration programmatically or print it to use in your YAML
print(block_id)

This script dynamically fetches the block ID by its name and prints it. You can incorporate this logic into your deployment script to automatically update the necessary configuration files or environment variables. ### Example 2: Python Script to Resolve and Set Default Block in Template You can also adjust your job template dynamically by embedding this logic inside your deployment configuration script:

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python
import yaml
from prefect.blocks.core import Block

# Function to update the worker job template
def update_worker_template(template_path, block_name):
    with open(template_path, 'r') as file:
        config = yaml.safe_load(file)
    
    # Fetch block by name
    docker_registry_credential = Block.load("DockerRegistryCredentials", name=block_name)
    block_id = docker_registry_credential.id

    # Update the config
    config['registry_credentials']['default']['$ref']['block_document_id'] = block_id

    # Write the updated config back
    with open(template_path, 'w') as file:
        yaml.safe_dump(config, file)

# Update your template with the specified block name
update_worker_template('worker_job_template.yaml', 'my-docker-credentials')

### Summary To programmatically set a default

DockerRegistryCredentials

using a block name instead of an ID: 1. Use Prefect's provided API to dynamically fetch the block by name and extract its ID. 2. Update the worker job configuration template with this ID programmatically. 3. Save the updated configuration, which ensures it references the correct block dynamically. This approach will ensure your deployment pipeline remains flexible and maintainable without hardcoding block IDs directly.

Dijar Vrella

07/07/2024, 2:38 PM

@Marvin but setting registry_credentials to this: title: "Registry Credentials" description: "Credentials for logging into a Docker registry to pull images from." allOf: - $ref: "#/definitions/DockerRegistryCredentials" default: $ref: block_document_name: "my-docker-credentials" Doesn't work (edited)

Marvin

07/07/2024, 2:38 PM

It seems there isn't native support for using

block_document_name

directly in YAML configuration for Prefect blocks. Prefect primarily identifies and references blocks using their

block_document_id

. Since setting the

registry_credentials

using

block_document_name

directly in the YAML doesn't work, you need a way to dynamically update your configuration programmatically. Here’s what you can do step-by-step: ### Step 1: Create or Identify the Block by Name Make sure that the Docker registry credentials block is created and saved with a known name, like

my-docker-credentials

. ### Step 2: Write a Python Script to Dynamically Update Configuration Use a Python script to fetch the block ID corresponding to the block name and update your YAML configuration file.

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python
import yaml
from prefect.blocks.storage import DockerRegistryCredentials

def update_worker_template(template_path, block_name):
    # Load the block by name
    block = DockerRegistryCredentials.load(name=block_name)
    block_id = block.id

    # Read the YAML file
    with open(template_path, 'r') as file:
        config = yaml.safe_load(file)
    
    # Update the config with the dynamically fetched block ID
    config['registry_credentials']['default']['$ref']['block_document_id'] = block_id

    # Write the updated config back to the file
    with open(template_path, 'w') as file:
        yaml.safe_dump(config, file)

# Call the function with the path to your template and the block name
update_worker_template('worker_job_template.yaml', 'my-docker-credentials')

### Step 3: Run the Script Before Deployment Include this script in your deployment pipeline to ensure that the YAML configuration file is updated with the correct block ID before it is used.

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bash
python update_worker_template.py

### Step 4: Worker Job Template (Post-Script Update) Your updated

worker_job_template.yaml

should look something like this:

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yaml
registry_credentials:
  title: "Registry Credentials"
  description: "Credentials for logging into a Docker registry to pull images from."
  allOf:
    - $ref: "#/definitions/DockerRegistryCredentials"
  default:
    $ref:
      block_document_id: "dynamically_injected_block_id"

### Quick Summary: 1. Create the block with a known name. 2. Write a Python Script to dynamically resolve the block's name to its ID. 3. Run the Script before using the YAML template to ensure it has the correct block ID. This approach provides a programmatically dynamic way to manage configuration, ensuring that your worker job templates always reference the correct

DockerRegistryCredentials

block without hardcoding the block ID.

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