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[BP 7.0.2] - XDCR - backfill req handler may not get correct throughSeqnos if pipeline is paused

Description

For 7.0, we have the following lines:

https://github.com/couchbase/goxdcr/blob/d90bca90e8195c66250c434418825c744216420a/backfill_manager/backfill_request_handler.go#L440-L445

Normally, when raising a backfill, XDCR will go figure out the throughSeqno and compile a backfill task for each VB going from 0 to whatever the throughSeqno is.

When the pipeline is stopped and not running, it will retrieve 0. Instead, it should follow the other path of 

https://github.com/couchbase/goxdcr/blob/d90bca90e8195c66250c434418825c744216420a/backfill_manager/backfill_request_handler.go#L867

and capture checkpoint number, in case the pipeline is stopped.

For 7.0, it's not a huge issue because the first call only happens during pipeline runtime. (Can consider this for backport just in case).

However, this is a hole that should be fixed in preparation for 7.1 and the work.

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CB robot August 9, 2021 at 8:42 PM

Build couchbase-server-7.0.1-5995 contains goxdcr commit 8a49a40 with commit message:
- backfill req handler may not get correct throughSeqnos if pipeline is paused

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Zendesk Support

Created August 6, 2021 at 12:24 AM
Updated October 14, 2021 at 1:29 PM
Resolved August 9, 2021 at 8:44 PM
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