What causes ERR_CHANNEL_MUST_BE_REOPENED?

A fatal error occurred on the server side invalidating the channel state. The channel was superseded by another client opening a channel with the same name. A row sequence gap was detected causing the channel to become invalid (ERR_CHANNEL_MUST_BE_REOPENED_DUE_TO_ROW_SEQ_GAP). Network disconnection caused the channel's server-side state to become inconsistent. Snowflake service maintenance requiring channel re-establishment

How do I fix ERR_CHANNEL_MUST_BE_REOPENED?

Get the last committed offset before closing: String lastOffset = channel.getLatestCommittedOffsetToken().. Close the invalid channel: channel.close().. Reopen with the same channel name: client.openChannel(OpenChannelRequest.builder(channelName)...).. Replay all rows with offset tokens after the lastOffset value to prevent data loss.. Implement an automatic reopen-on-error handler in the streaming client.

High severityexecutionSnowflake →

Power BI Refresh Error:
ERR_CHANNEL_MUST_BE_REOPENED

What does this error mean?

The Snowpipe Streaming channel has entered an unrecoverable error state and must be explicitly closed and reopened before streaming can resume. Any in-flight rows after the last committed offset must be replayed.

Common causes

1A fatal error occurred on the server side invalidating the channel state
2The channel was superseded by another client opening a channel with the same name
3A row sequence gap was detected causing the channel to become invalid (ERR_CHANNEL_MUST_BE_REOPENED_DUE_TO_ROW_SEQ_GAP)
4Network disconnection caused the channel's server-side state to become inconsistent
5Snowflake service maintenance requiring channel re-establishment

How to fix it

1Get the last committed offset before closing: String lastOffset = channel.getLatestCommittedOffsetToken().
2Close the invalid channel: channel.close().
3Reopen with the same channel name: client.openChannel(OpenChannelRequest.builder(channelName)...).
4Replay all rows with offset tokens after the lastOffset value to prevent data loss.
5Implement an automatic reopen-on-error handler in the streaming client.

Frequently asked questions

What happens to rows inserted after the last committed offset when the channel fails?

They are not committed to Snowflake. After reopening the channel, replay these rows using the offset tokens from your source system to ensure exactly-once delivery.

Can multiple clients open channels with the same name?

The second open supersedes the first — the first channel receives ERR_CHANNEL_MUST_BE_REOPENED. Only one active client should own a channel name at a time.

Official documentation: https://docs.snowflake.com/en/user-guide/snowpipe-streaming/snowpipe-streaming-high-performance-error-handling