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load_state()

This operation returns the load status of a specific collection.

Request syntax

load_state(
    collection_name: str,
    partition_names: list[str] | None
    using: str = "default",
    timeout: float | None
) -> LoadState

PARAMETERS:

  • collection_name (str) -

    [REQUIRED]

    The name of a collection.

  • partition_names (list[str]) -

    A list of partition names.

    If any partition names are specified, releasing any of these partitions results in the return of a NotLoad state.

  • using (string) -

    The alias of the employed connection.

    The default value is default, indicating that this operation employs the default connection.

  • timeout (float | None)

    The timeout duration for this operation. Setting this to None indicates that this operation timeouts when any response arrives or any error occurs.

RETURN TYPE:

LoadState

RETURNS: A LoadState object that indicates the load status of the specified collection.

The possible states are as follows:

  • Loaded

    Indicates that the specified collection is loaded.

  • Loading

    Indicates that the specified collection is being loaded.

  • NotExist

    Indicates that the specified collection does not exist.

    Including a non-existing partition in partition_names results in a MilvusException.

  • NotLoad

    Indicates that the specified collection is not loaded.

EXCEPTIONS:

  • MilvusException

    This exception will be raised when any error occurs during this operation.

Examples

from pymilvus import (
    connections, 
    Collection, 
    CollectionSchema, 
    FieldSchema, 
    DataType, 
    utility,
)

# Connect to localhost:19530
connections.connect()

# Create a collection
collection = Collection(
    name="test_collection",
    schema=CollectionSchema([
        FieldSchema("id", DataType.INT64, is_primary=True),
        FieldSchema("vector", DataType.FLOAT_VECTOR, dim=5)
    ])
)

# Set the index parameters
index_params = {
    "index_type": "AUTOINDEX",
    "metric_type": "COSINE",
    "params": {
        "nprobe": 10
    }
}

# Create an index on the vector field
collection.create_index(
    field_name="vector", 
    index_params=index_params, 
    timeout=None
)

# Load the collection
collection.load()

# Create two partitions
partition1 = collection.create_partition("partition1")
partition2 = collection.create_partition("partition2")

# Check the load
utility.load_state(
    collection_name="test_collection",
    partition_names=["partition1", "partition2"],
    using=using,
    timeout=timeout,
) # <LoadState: Loaded>

# Release a partition
partition2.release()

utility.load_state(collection_name="test_collection") # <LoadState: Loaded>

utility.load_state(
    collection_name="test_collection",
    partition_names=["partition1", "partition2"],
) # <LoadState: NotLoad>

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