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Migrate Data from HDF5 to Milvus

This topic describes how to import data in HDF5 files into Milvus using MilvusDM, an open-source tool specifically designed for Milvus data migration.

Prerequisites

You need to install MilvusDM before migrating Milvus data.

1. Download YAML file

Download the M2H.yaml file.

$ wget https://raw.githubusercontent.com/milvus-io/milvus-tools/main/yamls/M2H.yaml

2. Set the parameters

Configuration parameters include:

Parameter Description Example
milvus_version Version of Milvus. 2.0.0
data_path Path to the HDF5 files. Set either data_path or data_dir. - /Users/zilliz/float_1.h5
- /Users/zilliz/float_2.h5
data_dir Directory of the HDF5 files. Set either data_path or data_dir. '/Users/zilliz/Desktop/HDF5_data'
dest_host Milvus server address. '127.0.0.1'
dest_port Milvus server port. 19530
mode Mode of migration, including skip, append, and overwrite. This parameter works only when the specified collection name exists in the Milvus library.
  • skip refers to skipping data migration if the specified collection or partition already exists.
  • append refers to appending data if the specified collection or partition already exists.
  • overwrite refers to deleting existing data before insertion if the specified collection or partition already exists.
  • 'append'
    dest_collection_name Name of the collection to import data to. 'test_float'
    dest_partition_name (optional) Name of the partition to import data to. 'partition_1'
    collection_parameter Collection-specific information including vector dimension, index file size, and similarity metric. "dimension: 512
    index_file_size: 1024
    metric_type: 'HAMMING'"

    The following two examples of configuration are for your reference. The first example sets the parameter data_path while the second sets data_dir. You can set either data_path or data_dir according to your need.

    Example 1

    H2M:
      milvus-version: 2.0.0
      data_path:
        - /Users/zilliz/float_1.h5
        - /Users/zilliz/float_2.h5
      data_dir:
      dest_host: '127.0.0.1'
      dest_port: 19530
      mode: 'overwrite'        # 'skip/append/overwrite'
      dest_collection_name: 'test_float'
      dest_partition_name: 'partition_1'
      collection_parameter:
        dimension: 128
        index_file_size: 1024
        metric_type: 'L2'
    

    Example 2

    H2M:
      milvus_version: 2.0.0
      data_path:
      data_dir: '/Users/zilliz/HDF5_data'
      dest_host: '127.0.0.1'
      dest_port: 19530
      mode: 'append'        # 'skip/append/overwrite'
      dest_collection_name: 'test_binary'
      dest_partition_name: 
      collection_parameter:
        dimension: 512
        index_file_size: 1024
        metric_type: 'HAMMING'
    

    3. Migrate data from HDF5 to Milvus

    Run MilvusDM to import data in HDF5 files into Milvus with the following command.

    $ milvusdm --yaml H2M.yaml
    

    What's next

    • If you are interested in migrating data in other forms into Milvus,
    • If you are looking for information about how to migrate data from Milvus 1.x to Milvus 2.0,
    • If you are interested in learning more about the data migration tool,
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