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This feature is available starting in StarTree release 0.14.0. It must be enabled on demand — contact your StarTree representative to have it activated for your environment.
This guide walks through connecting an S3 Data Lake to StarTree using the Data Portal UI. No API calls or JSON configuration required — Data Portal guides you through catalog connection, table selection, and onboarding setup through a point-and-click interface.
Looking for the API-based approach? See S3: Onboarding via API.

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Overview

S3 Data Lake connects to raw Parquet files stored directly in an S3 bucket — no catalog service required. StarTree scans the specified S3 prefix, discovers Parquet files, and makes them queryable through Pinot.

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Prerequisites

Before starting, ensure you have:
  • StarTree 0.14.0 or later with the external table Beta feature enabled for your environment.
  • AWS credentials (access key + secret key) with s3:GetObject and s3:ListBucket permissions on the source bucket and prefix.
  • The bucket name, key prefix, and AWS region for your Parquet data.

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Step 1: Open the External Tables

  1. Log in to Data Portal.
  2. In the left navigation, go to Tables.
  3. Click + Connect External Table.
The wizard opens with a connection configuration screen.

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Step 2: Select S3 Data Lake

Choose S3 Data Lake as the catalog type. Fill in the connection details:
FieldDescription
S3 BucketName of the S3 bucket containing your Parquet files.
PrefixKey prefix (folder path) pointing to the Parquet data, e.g. path/to/parquet/data/. The prefix is passed to the S3 ListObjectsV2 API and will match all objects whose keys start with this string.
RegionAWS region where the bucket is located.
Access KeyAWS access key ID.
Secret KeyAWS secret access key.
Click Validate Connection. Data Portal calls the catalog’s validate endpoint and confirms credentials and connectivity before proceeding.

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Step 3: Browse and Select a Table

Once the connection is validated:
  1. Data Portal lists the available S3 prefixes (directories) under your configured prefix.
  2. Select a prefix to view the Parquet files it contains.
  3. Click the table (prefix) you want to onboard.
StarTree samples the Parquet files to derive a schema automatically.

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Step 4: Review the Schema

The auto-generated Pinot schema is displayed for review. You can:
  • Set a time column — select the column to use as the Pinot time dimension (optional; leave blank for no time partitioning).
  • Rename the schema — provide a custom schema name, or accept the default derived from the prefix.
Click Next when the schema looks correct.

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Step 5: Configure the Table

Review and adjust the table configuration:
SettingDefaultNotes
Onboarding scheduleEvery 5 minutesCron expression controlling how often new Parquet files are onboarded.
Null handlingEnabledRequired for schemas that include nullable columns.
Segment push typeAppendEach new batch of Parquet files is ingested as a new set of Pinot segments.
Click Create Table to register the schema and table with Pinot. Data Portal automatically triggers the first onboarding run immediately after creation — no manual step required.

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Step 6: Monitor Onboarding

Once the table is created, onboarding starts automatically. The table detail view shows the status in real time:
  • Running — the task is actively reading Parquet files and building Pinot segments.
  • Completed — onboarding finished successfully.
  • Failed — onboarding encountered an error. The error message and the number of files discovered vs. segments generated are surfaced to help diagnose the issue.
For deeper observability — watcher status, checkpoint values, and per-file counts — see the Observability page.

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Pausing Onboarding

To pause scheduled onboarding from Data Portal:
  1. Open the table in the Tables view.
  2. Click Pause Sync. This sets "enabled": "false" on the ExternalTableSyncTask. Any run currently in progress completes normally. Existing segments and the last checkpoint are preserved — when you re-enable, onboarding resumes from where it left off.

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Frequently Asked Questions

The Validate step fails — what should I check?
  • Confirm the access key has s3:GetObject and s3:ListBucket permissions on the bucket and prefix.
  • Verify the region matches where your S3 bucket is located.
  • Check that the prefix ends with / if it’s a folder path.
Can I onboard multiple prefixes from the same bucket? Yes. Each prefix is registered as an independent Pinot table with its own onboarding schedule. Start the wizard again and use the same bucket with a different prefix.
The table was created but onboarding hasn’t started — what should I check? Data Portal triggers the first onboarding run automatically after table creation. If onboarding hasn’t started, check the table’s detail page for an error status and review the error message. You can also trigger a run manually via the trigger API.