MySQL Error 3921: Invalid ZSTD Compression Level

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Description

This error occurs in MySQL replication when an invalid `MASTER_ZSTD_COMPRESSION_LEVEL` is specified for a replication channel. It indicates that the configured compression level for replicating events using ZSTD is outside the permissible range or is otherwise not supported by the MySQL server version. This typically prevents replication from starting or continuing.

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Error Message

Invalid MASTER_ZSTD_COMPRESSION_LEVEL %u for channel '%s'.

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Known Causes

4 known causes

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Compression Level Out of Range

The specified `MASTER_ZSTD_COMPRESSION_LEVEL` value is not within the valid range, which is typically 0 to 19.

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Incorrect Data Type

The value provided for `MASTER_ZSTD_COMPRESSION_LEVEL` is not a valid integer, or includes non-numeric characters.

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Server Version Incompatibility

The MySQL server version in use does not support `MASTER_ZSTD_COMPRESSION_LEVEL`, or its valid range differs from what was configured.

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Typo or Misconfiguration

A simple typo in the `MASTER_ZSTD_COMPRESSION_LEVEL` parameter name or a misunderstanding of its required format has occurred.

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Solutions

Coming Soon

Detailed step-by-step solutions for this error are being prepared. In the meantime, try these general troubleshooting tips:

General Troubleshooting Tips

Check the error message carefully for specific details
Review recent changes that might have caused the error
Search for the exact error code in the official documentation
Check log files for additional context
Try restarting the application or service

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Related Errors

5 related errors