clickzetta-realtime-sync-pipeline

name

clickzetta-realtime-sync-pipeline

description

Create and manage ClickZetta Lakehouse real-time sync tasks (single-table), syncing data from external sources to Lakehouse in real time. Supports Kafka, MySQL, PostgreSQL, and other data sources as the source, with Lakehouse as the target. Real-time sync tasks are continuously running streaming tasks — no scheduling required; they start running upon submission. Triggered when the user says "Studio real-time sync", "realtime sync", "single-table CDC sync", "real-time data sync", "Kafka real-time sync to Lakehouse", "MySQL single-table real-time sync", "single-table real-time sync", "real-time data migration". Covers real-time sync task creation, data source configuration, column mapping (including JSONPath computed columns), deployment, and operations — all ClickZetta Studio specific logic. Keywords: real-time sync, single table, Kafka source, MySQL source, streaming, CDC

Single-table Real-time Sync Pipeline Workflow

Wizard: Collect Required Information

Before creating a real-time sync task, use an interactive question tool (e.g., question) to collect the following information via option menus. If no such tool is available, list all questions in text at once:

Ask the user two questions: (1) What is the data source type — Kafka (topic real-time ingestion, supports JSON message parsing), MySQL/Aurora MySQL (single-table CDC), PostgreSQL/Aurora PG (single-table CDC), or SQL Server (single-table CDC)? (2) What is the sync granularity — single table/topic (supported by this skill, fine-grained configuration) or full database/multi-table (use clickzetta-cdc-sync-pipeline instead)?

If the user has already provided sufficient information, proceed directly to the workflow without showing the menu.

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Applicable Scenarios

• Sync data from external sources to Lakehouse in real time (low latency, continuously running)
• Kafka Topic → Lakehouse table (supports JSON message parsing)
• MySQL / PostgreSQL / SQL Server databases → Lakehouse table (CDC change capture)
• High data freshness requirements — second-level or minute-level latency
• Single source table/topic to single target table real-time sync
• Keywords: real-time sync, CDC, streaming sync, Kafka real-time sync

Comparison with Other Sync Methods

Dimension	Real-time Sync (This Skill)	Batch Sync	Multi-table Real-time Sync
Task Type ID	14 (REALTIME/CDC)	10 / 291	281
Sync Granularity	Single table/topic	Single/multi-table	Full database/multi-table
Run Mode	Continuously running (streaming)	Scheduled (batch)	Continuously running (streaming)
Scheduling	Not required, runs upon submission	Cron expression required	Not required, runs upon submission
Latency	Seconds to minutes	Depends on schedule interval	Seconds to minutes
Applicable Skill	clickzetta-realtime-sync-pipeline	clickzetta-batch-sync-pipeline	clickzetta-cdc-sync-pipeline

Prerequisites

• ClickZetta Lakehouse Studio account with permissions to create sync tasks and target tables
• Source data source already configured in Studio (Kafka / MySQL / PostgreSQL / SQL Server, etc.)
• Target Lakehouse data source available
• Sync VCluster available (real-time sync task_type=14 requires a Sync VCluster)
• Execution environment (one of the following, cz-cli preferred):
  • cz-cli path: cz-cli installed (brew install cz-cli or refer to official docs) and cz-cli setup completed
  • MCP path: clickzetta-studio-mcp tools available (create_task, save_integration_task, publish_task, list_data_sources, LH_show_object_list, etc.)

Environment Detection (Read Before Execution)

Before starting any operation, determine the current execution environment:

Step 1: Check if cz-cli is available

cz-cli --version

• If command exists → use cz-cli path (see "cz-cli Alternative Path" section at the end of this document)
• If command not found → continue to check MCP

Step 2: Check if MCP is available (only when cz-cli is unavailable)

Try calling the list_data_sources tool to query the data source list.

• If tool exists in tool list → use MCP path (default path in this document)
• If tool not found → stop execution and prompt the user:

  "Neither cz-cli nor MCP tools are available in the current environment. Please install one of them before retrying. cz-cli installation: brew install cz-cli or refer to official docs, then run cz-cli setup MCP installation: refer to clickzetta-studio-mcp configuration docs"

Workflow

Step 1: Confirm Sync VCluster Availability

Use LH_show_object_list (object_type='VCLUSTERS') to view available virtual clusters.
Filter for clusters where vcluster_type contains SYNC.
If no Sync VCluster is available, create one before proceeding.

Step 2: Find Available Data Sources

Use list_data_sources to view configured data source list.
Filter by type:
- Kafka: ds_type=2
- MySQL: ds_type=5
- PostgreSQL: ds_type=7
- SQL Server: ds_type=8
Record the source datasource_name and target Lakehouse datasource_name.

Step 3: Explore Source Data Structure (Optional)

Use list_namespaces to view the source data source's namespaces (databases/schemas).
Use list_metadata_objects to view tables/topics under a namespace.
Use get_metadata_detail to view the column structure of a specific table/topic.

Step 4: Create Real-time Sync Task

Use create_task to create the task:
- task_type: 14 (real-time sync)
- task_name: custom task name (recommend including source and target info, e.g., "rt_sync_kafka_orders")
- data_folder_id: target folder ID (obtainable via list_folders)

Record the returned task_id and studio_url.

Step 5: Configure Sync Content

Use save_integration_task to configure sync:
- task_id: task ID returned in Step 4
- source_datasource_name: source data source name
- source_schema: source database/schema (for Kafka, the namespace containing the topic)
- source_table: source table name or Kafka topic name
- source_ds_type: source type (2=Kafka, 5=MySQL, 7=PostgreSQL, 8=SQL Server)
- sink_datasource_name: target Lakehouse data source name
- sink_schema: target schema (default: public)
- sink_table: target table name (optional, defaults to same as source table)
- sink_ds_type: 1 (Lakehouse)

Note: The system automatically retrieves source and target metadata to generate column mappings. If the target table does not exist, it will be auto-created.

Step 6: Kafka JSON Message Parsing (Kafka Source Only)

If the Kafka topic message format is JSON, you can add computed columns in Studio UI to parse nested fields:

• Use JSONPath rules to parse content from the value field
• Examples: $.id extracts the top-level id field, $.data.code extracts a nested field
• By default, Kafka topic built-in fields (key, value, timestamp, partition, offset) are used for mapping
• Computed column configuration must be done in Studio UI (open via studio_url)

Step 7: Submit and Deploy

Real-time sync tasks do not require scheduling configuration (no need to call save_task_configuration).
Use publish_task to submit the task directly:
- task_id: task ID
- task_version: current version number (obtainable via get_task_detail)

The task starts running continuously upon submission.

Important: Real-time sync tasks do not support test runs in development state — submission is production deployment.

Step 8: Operations and Monitoring

After submission, manage real-time sync tasks in the Operations Center:

View task status: get_task_detail
View run history: list_task_run (note: real-time tasks run continuously, unlike batch tasks with periodic instances)

In Studio UI you can:
- Start/stop the task
- View sync latency and throughput
- View error logs

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Supported Data Sources

Source

Data Source	ds_type	Description
Kafka	2	Supports JSON message parsing (JSONPath computed columns)
MySQL	5	CDC change capture
PostgreSQL	7	CDC change capture
SQL Server	8	CDC change capture
Aurora MySQL	39	CDC change capture
Aurora PostgreSQL	40	CDC change capture
PolarDB MySQL	19	CDC change capture
PolarDB PostgreSQL	48	CDC change capture

Target

Data Source	ds_type
Lakehouse	1

Troubleshooting

Issue	Investigation
Task creation failed	Check if a Sync VCluster is available (LH_show_object_list to view VCLUSTERS, filter for SYNC type)
Source connection failed	Check data source connection info, network reachability, account permissions
No data consumed from Kafka	Check topic name, consumer offset settings, Kafka cluster connectivity
JSON parsing failed	Check JSONPath expression correctness, verify message format is valid JSON
Increasing sync latency	Check if Sync VCluster resources are sufficient, whether source data volume has spiked
Target table write failed	Check if target table exists, column type compatibility, sufficient permissions
Task stopped unexpectedly	Check execution logs (list_executions + get_execution_log) for specific errors

Notes

Run Mode

• Real-time sync tasks are continuously running streaming tasks — they start running upon submission without scheduling
• Test runs in development state are not supported
• After stopping, manual restart is required

Sync VCluster Requirements

• Real-time sync tasks (task_type=14) must use a Sync VCluster
• Confirm a Sync VCluster is available before creating the task
• Check via LH_show_object_list (object_type='VCLUSTERS'), filter for clusters where vcluster_type contains SYNC

Kafka Source Special Notes

• Supports specifying consumer start offset (earliest / latest / specific offset)
• JSON messages can be parsed via JSONPath computed columns for nested fields
• Default fields include: key, value, timestamp, partition, offset

Choosing Between Single-table and Multi-table Real-time Sync

• Single-table real-time sync (this skill): suitable for fine-grained sync of a single table/topic
• Multi-table real-time sync (clickzetta-cdc-sync-pipeline): suitable for full database CDC, multi-table batch real-time sync
• If you need to sync all tables in a database, use multi-table real-time sync

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cz-cli Alternative Path

Use this section only when cz-cli is available and MCP is not. Step numbers correspond to the MCP path above. All operations are delegated to the built-in agent via cz-cli agent run, which has full Studio MCP tool access.

Single-table Real-time Sync (cz-cli Version)

Quick path: Create the task directly, then configure data source in Studio UI

# Step 1: Create real-time sync task (task_type=14, i.e., REALTIME/CDC)
cz-cli task create "rt_sync_<table>" --type REALTIME --folder <folder_name>
# Returns task_id and studio_url — complete data source configuration and column mapping at studio_url

# Step 2: After configuration, deploy the task (real-time sync needs no scheduling, runs continuously upon submission)
cz-cli task deploy "rt_sync_<table>" -y

Full agent path (when agent is needed for data source exploration and configuration):

# One-shot: let the agent complete the full real-time sync task creation
cz-cli agent run "Create a real-time sync task (task_type=14), sync data source <source_ds_name> <schema>.<table> (or Kafka topic <topic>) to Lakehouse public schema in real time, use Sync VCluster, task name rt_sync_<table>, place in <folder_name> folder" \
  --format a2a --dangerously-skip-permissions

For scenarios requiring fine-grained control, split into steps:

# Step 1: Confirm Sync VCluster availability
cz-cli agent run "List all available VClusters, filter for clusters where vcluster_type contains SYNC, confirm a Sync VCluster is available" \
  --format a2a --dangerously-skip-permissions

# Step 2: Find data sources
cz-cli agent run "List all configured data sources, filter by type (Kafka: ds_type=2, MySQL: ds_type=5, PostgreSQL: ds_type=7, SQL Server: ds_type=8), record source and target Lakehouse data source names" \
  --format a2a --dangerously-skip-permissions

# Step 3 (Optional): Explore source data structure
cz-cli agent run "View namespace list for data source <source_ds_name>, and the table/topic list and column structure under <schema>" \
  --format a2a --dangerously-skip-permissions

# Steps 4-5: Create and configure real-time sync task
cz-cli agent run "Create a real-time sync task (task_type=14), source datasource=<source_ds_name>, schema=<schema>, table=<table> (source_ds_type=<type>), target Lakehouse public.<table>, task name rt_sync_<table>" \
  --format a2a --dangerously-skip-permissions

# Step 7: Submit and deploy
cz-cli agent run "Submit real-time sync task rt_sync_<table> to start continuous running" \
  --format a2a --dangerously-skip-permissions

Note: Real-time sync tasks do not require scheduling configuration — they start running continuously upon submission. Kafka JSON message computed column configuration must be done in Studio UI.

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Operations and Monitoring (cz-cli Version)

# View recent run history
cz-cli runs list --task <task_name>

# View run details
cz-cli runs detail <run_id>

# View execution logs
cz-cli attempts log <run_id>

# Undeploy task (stop continuous running)
cz-cli task undeploy <task_name> -y