Databricks Zerobus Ingest SDK for Python

Public Preview: This SDK is supported for production use cases and is available to all customers. Databricks is actively working on stabilizing the Zerobus Ingest SDK for Python. Minor version updates may include backwards-incompatible changes.

We are keen to hear feedback from you on this SDK. Please file issues, and we will address them.

The Databricks Zerobus Ingest SDK for Python provides a high-performance client for ingesting data directly into Databricks Delta tables using the Zerobus streaming protocol. | See also the SDK for Rust | See also the SDK for Java

Table of Contents

• Disclaimer
• Features
• Requirements
• Quick Start User Guide
  • Prerequisites
  • Installation
  • Choose Your Serialization Format
  • Option 1: Using JSON (Simplest)
  • Option 2: Using Protocol Buffers
• Usage Examples
  • JSON Examples
  • Protocol Buffer Examples
• Authentication
• Configuration
• Error Handling
• API Reference
• Best Practices

Features

• High-throughput ingestion: Optimized for high-volume data ingestion
• Automatic recovery: Built-in retry and recovery mechanisms
• Flexible configuration: Customizable stream behavior and timeouts
• Multiple serialization formats: Support for JSON and Protocol Buffers
• OAuth 2.0 authentication: Secure authentication with client credentials
• Configurable TLS: Custom TLS configuration support for advanced security requirements
• Sync and Async support: Both synchronous and asynchronous APIs
• Comprehensive logging: Detailed logging using Python's standard logging framework

Requirements

Runtime Requirements

• Python: 3.9 or higher
• Databricks workspace with Zerobus access enabled

Dependencies

• protobuf >= 4.25.0, < 7.0
• grpcio >= 1.60.0, < 2.0
• requests >= 2.28.1, < 3

Quick Start User Guide

Prerequisites

Before using the SDK, you'll need the following:

1. Workspace URL and Workspace ID

After logging into your Databricks workspace, look at the browser URL:

https://<databricks-instance>.cloud.databricks.com/o=<workspace-id>

• Workspace URL: The part before /o= → https://<databricks-instance>.cloud.databricks.com
• Workspace ID: The part after /o= → <workspace-id>

Note: The examples above show AWS endpoints (.cloud.databricks.com). For Azure deployments, the workspace URL will be https://<databricks-instance>.azuredatabricks.net.

Example:

• Full URL: https://dbc-a1b2c3d4-e5f6.cloud.databricks.com/o=1234567890123456
• Workspace URL: https://dbc-a1b2c3d4-e5f6.cloud.databricks.com
• Workspace ID: 1234567890123456

2. Create a Delta Table

Create a table using Databricks SQL:

CREATE TABLE <catalog_name>.default.air_quality (
    device_name STRING,
    temp INT,
    humidity BIGINT
)
USING DELTA;

Replace <catalog_name> with your catalog name (e.g., main).

3. Create a Service Principal

1. Navigate to Settings > Identity and Access in your Databricks workspace
2. Click Service principals and create a new service principal
3. Generate a new secret for the service principal and save it securely
4. Grant the following permissions:
   • USE_CATALOG on the catalog (e.g., main)
   • USE_SCHEMA on the schema (e.g., default)
   • MODIFY and SELECT on the table (e.g., air_quality)

Grant permissions using SQL:

-- Grant catalog permission
GRANT USE CATALOG ON CATALOG <catalog_name> TO `<service-principal-application-id>`;

-- Grant schema permission
GRANT USE SCHEMA ON SCHEMA <catalog_name>.default TO `<service-principal-application-id>`;

-- Grant table permissions
GRANT SELECT, MODIFY ON TABLE <catalog_name>.default.air_quality TO `<service-principal-application-id>`;

Installation

From PyPI

Install the latest stable version using pip:

pip install databricks-zerobus-ingest-sdk

From Source

Clone the repository and install from source:

git clone https://github.com/databricks/zerobus-sdk-py.git
cd zerobus-sdk-py
pip install -e .

Choose Your Serialization Format

The SDK supports two serialization formats:

1. JSON - Simple, no schema compilation needed. Good for getting started.
2. Protocol Buffers (Default to maintain backwards compatibility) - Strongly-typed schemas. More efficient over the wire.

Option 1: Using JSON

Write Your Client Code (JSON)

Synchronous Example:

import json
import logging
from zerobus.sdk.sync import ZerobusSdk
from zerobus.sdk.shared import RecordType, StreamConfigurationOptions, TableProperties

# Configure logging (optional but recommended)
logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s"
)

# Configuration
# For AWS:
server_endpoint = "1234567890123456.zerobus.us-west-2.cloud.databricks.com"
workspace_url = "https://dbc-a1b2c3d4-e5f6.cloud.databricks.com"
# For Azure:
# server_endpoint = "1234567890123456.zerobus.us-west-2.azuredatabricks.net"
# workspace_url = "https://dbc-a1b2c3d4-e5f6.azuredatabricks.net"

table_name = "main.default.air_quality"
client_id = "your-service-principal-application-id"
client_secret = "your-service-principal-secret"

# Initialize SDK
sdk = ZerobusSdk(server_endpoint, workspace_url)

# Configure table properties
table_properties = TableProperties(table_name)

# Configure stream with JSON record type
options = StreamConfigurationOptions(record_type=RecordType.JSON)

# Create stream
stream = sdk.create_stream(client_id, client_secret, table_properties, options)

try:
    # Ingest records
    for i in range(100):
        # Create JSON record
        record_dict = {
            "device_name": f"sensor-{i % 10}",
            "temp": 20 + (i % 15),
            "humidity": 50 + (i % 40)
        }
        json_record = json.dumps(record_dict)

        ack = stream.ingest_record(json_record)
        ack.wait_for_ack()  # Optional: Wait for durability confirmation

        print(f"Ingested record {i + 1}")

    print("Successfully ingested 100 records!")
finally:
    stream.close()

Asynchronous Example:

import asyncio
import json
import logging
from zerobus.sdk.aio import ZerobusSdk
from zerobus.sdk.shared import RecordType, StreamConfigurationOptions, TableProperties

# Configure logging (optional but recommended)
logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s"
)

async def main():
    # Configuration
    # For AWS:
    server_endpoint = "1234567890123456.zerobus.us-west-2.cloud.databricks.com"
    workspace_url = "https://dbc-a1b2c3d4-e5f6.cloud.databricks.com"
    # For Azure:
    # server_endpoint = "1234567890123456.zerobus.us-west-2.azuredatabricks.net"
    # workspace_url = "https://dbc-a1b2c3d4-e5f6.azuredatabricks.net"

    table_name = "main.default.air_quality"
    client_id = "your-service-principal-application-id"
    client_secret = "your-service-principal-secret"

    # Initialize SDK
    sdk = ZerobusSdk(server_endpoint, workspace_url)

    # Configure table properties
    table_properties = TableProperties(table_name)

    # Configure stream with JSON record type
    options = StreamConfigurationOptions(record_type=RecordType.JSON)

    # Create stream
    stream = await sdk.create_stream(client_id, client_secret, table_properties, options)

    try:
        # Ingest records
        for i in range(100):
            # Create JSON record
            record_dict = {
                "device_name": f"sensor-{i % 10}",
                "temp": 20 + (i % 15),
                "humidity": 50 + (i % 40)
            }
            json_record = json.dumps(record_dict)

            future = await stream.ingest_record(json_record)
            await future  # Optional: Wait for durability confirmation

            print(f"Ingested record {i + 1}")

        print("Successfully ingested 100 records!")
    finally:
        await stream.close()

asyncio.run(main())

Option 2: Using Protocol Buffers

You'll need to define and compile a protobuf schema.

Define Your Protocol Buffer Schema

Create a file named record.proto:

syntax = "proto2";

message AirQuality {
    optional string device_name = 1;
    optional int32 temp = 2;
    optional int64 humidity = 3;
}

Compile the protobuf:

pip install "grpcio-tools>=1.60.0,<2.0"
python -m grpc_tools.protoc --python_out=. --proto_path=. record.proto

This generates a record_pb2.py file compatible with protobuf 6.x.

Generate Protocol Buffer Schema from Unity Catalog (Alternative)

Instead of manually writing your protobuf schema, you can automatically generate it from an existing Unity Catalog table using the included generate_proto.py tool.

Basic Usage:

python -m zerobus.tools.generate_proto \
    --uc-endpoint "https://dbc-a1b2c3d4-e5f6.cloud.databricks.com" \
    --client-id "your-service-principal-application-id" \
    --client-secret "your-service-principal-secret" \
    --table "main.default.air_quality" \
    --output "record.proto" \
    --proto-msg "AirQuality"

Parameters:

• --uc-endpoint: Your workspace URL (required)
• --client-id: Service principal application ID (required)
• --client-secret: Service principal secret (required)
• --table: Fully qualified table name in format catalog.schema.table (required)
• --output: Output path for the generated proto file (required)
• --proto-msg: Name of the protobuf message (optional, defaults to table name)

After generating, compile it as shown above.

Type Mappings:

Delta Type	Proto2 Type
INT, SMALLINT, SHORT	int32
BIGINT, LONG	int64
FLOAT	float
DOUBLE	double
STRING, VARCHAR	string
BOOLEAN	bool
BINARY	bytes
DATE	int32
TIMESTAMP	int64
ARRAY<type>	repeated type
MAP<key, value>	map<key, value>
STRUCT<fields>	nested message

Write Your Client Code (Protocol Buffers)

Synchronous Example:

import logging
from zerobus.sdk.sync import ZerobusSdk
from zerobus.sdk.shared import TableProperties
import record_pb2

# Configure logging (optional but recommended)
logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s"
)

# Configuration
# For AWS:
server_endpoint = "1234567890123456.zerobus.us-west-2.cloud.databricks.com"
workspace_url = "https://dbc-a1b2c3d4-e5f6.cloud.databricks.com"
# For Azure:
# server_endpoint = "1234567890123456.zerobus.us-west-2.azuredatabricks.net"
# workspace_url = "https://dbc-a1b2c3d4-e5f6.azuredatabricks.net"

table_name = "main.default.air_quality"
client_id = "your-service-principal-application-id"
client_secret = "your-service-principal-secret"

# Initialize SDK
sdk = ZerobusSdk(server_endpoint, workspace_url)

# Configure table properties with protobuf descriptor
table_properties = TableProperties(table_name, record_pb2.AirQuality.DESCRIPTOR)

# Create stream
stream = sdk.create_stream(client_id, client_secret, table_properties)

try:
    # Ingest records
    for i in range(100):
        record = record_pb2.AirQuality(
            device_name=f"sensor-{i % 10}",
            temp=20 + (i % 15),
            humidity=50 + (i % 40)
        )

        ack = stream.ingest_record(record)
        ack.wait_for_ack()  # Optional: Wait for durability confirmation

        print(f"Ingested record {i + 1}")

    print("Successfully ingested 100 records!")
finally:
    stream.close()

Asynchronous Example:

import asyncio
import logging
from zerobus.sdk.aio import ZerobusSdk
from zerobus.sdk.shared import TableProperties
import record_pb2

# Configure logging (optional but recommended)
logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s"
)

async def main():
    # Configuration
    # For AWS:
    server_endpoint = "1234567890123456.zerobus.us-west-2.cloud.databricks.com"
    workspace_url = "https://dbc-a1b2c3d4-e5f6.cloud.databricks.com"
    # For Azure:
    # server_endpoint = "1234567890123456.zerobus.us-west-2.azuredatabricks.net"
    # workspace_url = "https://dbc-a1b2c3d4-e5f6.azuredatabricks.net"

    table_name = "main.default.air_quality"
    client_id = "your-service-principal-application-id"
    client_secret = "your-service-principal-secret"

    # Initialize SDK
    sdk = ZerobusSdk(server_endpoint, workspace_url)

    # Configure table properties with protobuf descriptor
    table_properties = TableProperties(table_name, record_pb2.AirQuality.DESCRIPTOR)

    # Create stream
    stream = await sdk.create_stream(client_id, client_secret, table_properties)

    try:
        # Ingest records
        for i in range(100):
            record = record_pb2.AirQuality(
                device_name=f"sensor-{i % 10}",
                temp=20 + (i % 15),
                humidity=50 + (i % 40)
            )

            future = await stream.ingest_record(record)
            await future  # Optional: Wait for durability confirmation

            print(f"Ingested record {i + 1}")

        print("Successfully ingested 100 records!")
    finally:
        await stream.close()

asyncio.run(main())

Usage Examples

See the examples/ directory for complete, runnable examples in both JSON and protobuf formats (sync and async variants). See examples/README.md for detailed instructions.

JSON Examples

Blocking Ingestion (JSON)

import json
import logging
from zerobus.sdk.sync import ZerobusSdk
from zerobus.sdk.shared import RecordType, StreamConfigurationOptions, TableProperties

logging.basicConfig(level=logging.INFO)

sdk = ZerobusSdk(server_endpoint, workspace_url)
table_properties = TableProperties(table_name)
options = StreamConfigurationOptions(record_type=RecordType.JSON)
stream = sdk.create_stream(client_id, client_secret, table_properties, options)

try:
    for i in range(1000):
        record_dict = {
            "device_name": f"sensor-{i}",
            "temp": 20 + i % 15,
            "humidity": 50 + i % 40
        }
        json_record = json.dumps(record_dict)

        ack = stream.ingest_record(json_record)
        ack.wait_for_ack()  # Optional: Wait for durability confirmation
finally:
    stream.close()

Non-Blocking Ingestion (JSON)

import asyncio
import json
import logging
from zerobus.sdk.aio import ZerobusSdk
from zerobus.sdk.shared import RecordType, StreamConfigurationOptions, TableProperties

logging.basicConfig(level=logging.INFO)

async def main():
    options = StreamConfigurationOptions(
        record_type=RecordType.JSON,
        max_inflight_records=50000,
        ack_callback=lambda response: print(
            f"Acknowledged offset: {response.durability_ack_up_to_offset}"
        )
    )

    sdk = ZerobusSdk(server_endpoint, workspace_url)
    table_properties = TableProperties(table_name)
    stream = await sdk.create_stream(client_id, client_secret, table_properties, options)

    futures = []
    try:
        for i in range(100000):
            record_dict = {
                "device_name": f"sensor-{i % 10}",
                "temp": 20 + i % 15,
                "humidity": 50 + i % 40
            }
            json_record = json.dumps(record_dict)

            future = await stream.ingest_record(json_record)
            futures.append(future)

        await stream.flush()
        await asyncio.gather(*futures)
    finally:
        await stream.close()

asyncio.run(main())

Protocol Buffer Examples

Blocking Ingestion (Protobuf)

import logging
from zerobus.sdk.sync import ZerobusSdk
from zerobus.sdk.shared import TableProperties
import record_pb2

logging.basicConfig(level=logging.INFO)

sdk = ZerobusSdk(server_endpoint, workspace_url)
table_properties = TableProperties(table_name, record_pb2.AirQuality.DESCRIPTOR)
stream = sdk.create_stream(client_id, client_secret, table_properties)

try:
    for i in range(1000):
        record = record_pb2.AirQuality(
            device_name=f"sensor-{i}",
            temp=20 + i % 15,
            humidity=50 + i % 40
        )

        ack = stream.ingest_record(record)
        ack.wait_for_ack()  # Optional: Wait for durability confirmation
finally:
    stream.close()

Non-Blocking Ingestion (Protobuf)

import asyncio
import logging
from zerobus.sdk.aio import ZerobusSdk
from zerobus.sdk.shared import TableProperties, StreamConfigurationOptions
import record_pb2

logging.basicConfig(level=logging.INFO)

async def main():
    options = StreamConfigurationOptions(
        max_inflight_records=50000,
        ack_callback=lambda response: print(
            f"Acknowledged offset: {response.durability_ack_up_to_offset}"
        )
    )

    sdk = ZerobusSdk(server_endpoint, workspace_url)
    table_properties = TableProperties(table_name, record_pb2.AirQuality.DESCRIPTOR)
    stream = await sdk.create_stream(client_id, client_secret, table_properties, options)

    futures = []
    try:
        for i in range(100000):
            record = record_pb2.AirQuality(
                device_name=f"sensor-{i % 10}",
                temp=20 + i % 15,
                humidity=50 + i % 40
            )

            future = await stream.ingest_record(record)
            futures.append(future)

        await stream.flush()
        await asyncio.gather(*futures)
    finally:
        await stream.close()

asyncio.run(main())

Authentication

The SDK uses OAuth 2.0 Client Credentials for authentication:

from zerobus.sdk.sync import ZerobusSdk
from zerobus.sdk.shared import TableProperties
import record_pb2

sdk = ZerobusSdk(server_endpoint, workspace_url)
table_properties = TableProperties(table_name, record_pb2.AirQuality.DESCRIPTOR)

# Create stream with OAuth authentication
stream = sdk.create_stream(client_id, client_secret, table_properties)

The SDK automatically handles OAuth 2.0 authentication and uses secure TLS connections with system CA certificates by default.

For advanced use cases requiring custom authentication headers or TLS configuration, see the HeadersProvider and TlsConfig sections in the API Reference below.

Configuration

Stream Configuration Options

Option	Default	Description
record_type	RecordType.PROTO	Serialization format: RecordType.PROTO or RecordType.JSON
max_inflight_records	50000	Maximum number of unacknowledged records
recovery	True	Enable automatic stream recovery
recovery_timeout_ms	15000	Timeout for recovery operations (ms)
recovery_backoff_ms	2000	Delay between recovery attempts (ms)
recovery_retries	3	Maximum number of recovery attempts
flush_timeout_ms	300000	Timeout for flush operations (ms)
server_lack_of_ack_timeout_ms	60000	Server acknowledgment timeout (ms)
ack_callback	None	Callback invoked on record acknowledgment

Example Configuration

from zerobus.sdk.shared import StreamConfigurationOptions

options = StreamConfigurationOptions(
    max_inflight_records=10000,
    recovery=True,
    recovery_timeout_ms=20000,
    ack_callback=lambda response: print(
        f"Ack: {response.durability_ack_up_to_offset}"
    )
)

stream = sdk.create_stream(
    client_id,
    client_secret,
    table_properties,
    options
)

Error Handling

The SDK raises two types of exceptions:

• ZerobusException: Retriable errors (e.g., network issues, temporary server errors)
• NonRetriableException: Non-retriable errors (e.g., invalid credentials, missing table)

from zerobus.sdk.shared import ZerobusException, NonRetriableException

try:
    stream.ingest_record(record)
except NonRetriableException as e:
    # Fatal error - do not retry
    print(f"Non-retriable error: {e}")
    raise
except ZerobusException as e:
    # Retriable error - can retry with backoff
    print(f"Retriable error: {e}")
    # Implement retry logic

API Reference

ZerobusSdk

Main entry point for the SDK.

Synchronous API:

from zerobus.sdk.sync import ZerobusSdk

sdk = ZerobusSdk(server_endpoint, unity_catalog_endpoint)

Constructor Parameters:

• server_endpoint (str) - The Zerobus gRPC endpoint (e.g., <workspace-id>.zerobus.<region>.cloud.databricks.com for AWS, or <workspace-id>.zerobus.<region>.azuredatabricks.net for Azure)
• unity_catalog_endpoint (str) - The Unity Catalog endpoint (your workspace URL)

Methods:

def create_stream(
    client_id: str,
    client_secret: str,
    table_properties: TableProperties,
    options: StreamConfigurationOptions = None,
    tls_config: TlsConfig = None,
    headers_provider: HeadersProvider = None
) -> ZerobusStream

Creates a new ingestion stream using OAuth 2.0 Client Credentials authentication.

Parameters:

• client_id (str) - OAuth client ID (ignored if headers_provider is provided)
• client_secret (str) - OAuth client secret (ignored if headers_provider is provided)
• table_properties (TableProperties) - Target table configuration
• options (StreamConfigurationOptions) - Stream behavior configuration (optional)
• tls_config (TlsConfig) - Custom TLS configuration (optional, defaults to SecureTlsConfig)
• headers_provider (HeadersProvider) - Custom headers provider (optional, defaults to OAuth)

Automatically includes these headers (when using default OAuth):

• "authorization": "Bearer <oauth_token>" (fetched via OAuth 2.0 Client Credentials flow)
• "x-databricks-zerobus-table-name": "<table_name>"

Returns a ZerobusStream instance.

---

Asynchronous API:

from zerobus.sdk.aio import ZerobusSdk

sdk = ZerobusSdk(server_endpoint, unity_catalog_endpoint)

Methods:

async def create_stream(
    client_id: str,
    client_secret: str,
    table_properties: TableProperties,
    options: StreamConfigurationOptions = None,
    tls_config: TlsConfig = None,
    headers_provider: HeadersProvider = None
) -> ZerobusStream

Creates a new ingestion stream using OAuth 2.0 Client Credentials authentication.

Parameters:

• client_id (str) - OAuth client ID (ignored if headers_provider is provided)
• client_secret (str) - OAuth client secret (ignored if headers_provider is provided)
• table_properties (TableProperties) - Target table configuration
• options (StreamConfigurationOptions) - Stream behavior configuration (optional)
• tls_config (TlsConfig) - Custom TLS configuration (optional, defaults to SecureTlsConfig)
• headers_provider (HeadersProvider) - Custom headers provider (optional, defaults to OAuth)

Automatically includes these headers (when using default OAuth):

• "authorization": "Bearer <oauth_token>" (fetched via OAuth 2.0 Client Credentials flow)
• "x-databricks-zerobus-table-name": "<table_name>"

Returns a ZerobusStream instance.

---

ZerobusStream

Represents an active ingestion stream.

Synchronous Methods:

def ingest_record(record: Union[str, bytes, Message]) -> RecordAcknowledgment

Ingests a single record. Pass a JSON string (JSON mode) or protobuf message/bytes (protobuf mode). Returns a RecordAcknowledgment for tracking.

def flush() -> None

Flushes all pending records and waits for server acknowledgment. Does not close the stream.

def close() -> None

Flushes and closes the stream gracefully. Always call in a finally block.

def get_state() -> StreamState

Returns the current stream state.

@property
def stream_id() -> str

Returns the unique stream ID assigned by the server.

---

Asynchronous Methods:

async def ingest_record(record: Union[str, bytes, Message]) -> Awaitable

Ingests a single record. Pass a JSON string (JSON mode) or protobuf message/bytes (protobuf mode). Returns an awaitable that completes when the record is durably written.

async def flush() -> None

Flushes all pending records and waits for server acknowledgment. Does not close the stream.

async def close() -> None

Flushes and closes the stream gracefully. Always call in a finally block.

def get_state() -> StreamState

Returns the current stream state.

@property
def stream_id() -> str

Returns the unique stream ID assigned by the server.

---

TableProperties

Configuration for the target table.

Constructor:

TableProperties(table_name: str, descriptor: Descriptor = None)

Parameters:

• table_name (str) - Fully qualified table name (e.g., catalog.schema.table)
• descriptor (Descriptor) - Protobuf message descriptor (e.g., MyMessage.DESCRIPTOR). Required for protobuf mode, not needed for JSON mode.

Examples:

# JSON mode
table_properties = TableProperties("catalog.schema.table")

# Protobuf mode (default)
table_properties = TableProperties("catalog.schema.table", record_pb2.MyMessage.DESCRIPTOR)

---

HeadersProvider

Abstract base class for providing authentication headers to gRPC streams.

Default: The SDK uses OAuthHeadersProvider internally, which handles OAuth 2.0 Client Credentials authentication automatically when you call create_stream().

Custom Implementation: For advanced use cases, you can implement a custom HeadersProvider by extending the base class and implementing the get_headers() method. Custom providers must include both the authorization and x-databricks-zerobus-table-name headers. See example files for implementation details.

---

TlsConfig

Abstract base class for configuring TLS/SSL settings for gRPC connections.

Default: The SDK uses SecureTlsConfig with system CA certificates automatically when you call create_stream().

Custom Implementation: For advanced use cases (custom CA certificates, mutual TLS, custom cipher suites), you can implement a custom TlsConfig by extending the base class and implementing the to_channel_credentials() method. See example files for implementation details.

---

StreamConfigurationOptions

Configuration options for stream behavior.

Constructor:

StreamConfigurationOptions(
    record_type: RecordType = RecordType.PROTO,
    max_inflight_records: int = 50000,
    recovery: bool = True,
    recovery_timeout_ms: int = 15000,
    recovery_backoff_ms: int = 2000,
    recovery_retries: int = 3,
    flush_timeout_ms: int = 300000,
    server_lack_of_ack_timeout_ms: int = 60000,
    ack_callback: Callable = None
)

Parameters:

• record_type (RecordType) - Serialization format: RecordType.PROTO (default) or RecordType.JSON
• max_inflight_records (int) - Maximum number of unacknowledged records (default: 50000)
• recovery (bool) - Enable or disable automatic stream recovery (default: True)
• recovery_timeout_ms (int) - Recovery operation timeout in milliseconds (default: 15000)
• recovery_backoff_ms (int) - Delay between recovery attempts in milliseconds (default: 2000)
• recovery_retries (int) - Maximum number of recovery attempts (default: 3)
• flush_timeout_ms (int) - Flush operation timeout in milliseconds (default: 300000)
• server_lack_of_ack_timeout_ms (int) - Server acknowledgment timeout in milliseconds (default: 60000)
• ack_callback (Callable) - Callback to be invoked when records are acknowledged by the server (default: None)

---

RecordAcknowledgment (Sync API only)

Future-like object for waiting on acknowledgments.

Methods:

def wait_for_ack(timeout_sec: float = None) -> None

Blocks until the record is acknowledged or timeout is reached.

def add_done_callback(callback: Callable) -> None

Adds a callback to be invoked when the record is acknowledged.

def is_done() -> bool

Returns True if the record has been acknowledged.

---

StreamState (Enum)

Represents the lifecycle state of a stream.

Values:

• UNINITIALIZED - Stream created but not yet initialized
• OPENED - Stream is open and accepting records
• FLUSHING - Stream is flushing pending records
• RECOVERING - Stream is recovering from a failure
• CLOSED - Stream has been gracefully closed
• FAILED - Stream has failed and cannot be recovered

---

ZerobusException

Base exception for retriable errors.

Constructor:

ZerobusException(message: str, cause: Exception = None)

---

NonRetriableException

Exception for non-retriable errors (extends ZerobusException).

Constructor:

NonRetriableException(message: str, cause: Exception = None)

Best Practices

1. Reuse SDK instances: Create one ZerobusSdk instance per application
2. Stream lifecycle: Always close streams in a finally block to ensure all records are flushed
3. Batch size: Adjust max_inflight_records based on your throughput requirements
4. Error handling: Implement proper retry logic for retriable errors
5. Monitoring: Use ack_callback to track ingestion progress
6. Choose the right API: Use sync API for low-volume, async API for high-volume ingestion
7. Token refresh: Tokens are automatically refreshed on stream creation and recovery