Troubleshooting “InputStream not fully consumed” Error During Data Ingestion

This article describes the root cause, investigation approach, and recommended resolutions for ingestion failures triggered by the error:

InputStream not fully consumed – Expected bytes read: X | Actual: Y

This issue typically occurs when a source file is incomplete, corrupted, or improperly formatted during ingestion into Amperity.

Problem: 

A customer encountered a failure ingesting the feed Experian:customer_attributes_temp (df-6edgbm) with the following error:

Feed: Experian:customer_attributes_temp (df-6edgbm) failed with: InputStream not fully consumed - Expected bytes read: 4047774661 | Actual: 3746356404

Root Cause:

The failure occurred because the input stream ended prematurely, meaning:

  • The file did not match the expected size, OR

  • The source file was incomplete or truncated during transfer, OR

  • Formatting issues interrupted the parser before reaching the end of the file.

Additional ingest errors confirmed data quality issues:

  • 'Unexpected character following quote: A'

  • 'Data cell exceeded the maximum size of 65536 while reading'

These errors suggest malformed CSV content.

Solution:

Follow these steps to resolve the “InputStream not fully consumed” error during data ingestion:

  1. Check the Data Source: Please verify the completeness and integrity of the data feed. Ensure that the file has been fully transferred and matches the expected size.
  2. Fix Data Formatting Issues: Look for any formatting issues in the data, especially unexpected characters or improperly closed quotes, which could cause parsing issues.
  3. Check for Large Data Cells: Ensure that no data cells exceed the 65,536 character limit.
  4. Retry the Ingestion Process: After addressing the above issues, please try re-running the data ingestion process to see if the errors are resolved.