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Description of problem:
In a replicated topology, if a supplier has not received any direct update for a long time (for example 3 months). When this supplier receive a direct update, its RUVelement will be selected for each replication session (lowest csn) and the session will start by scanning 3 months of updates before finding something to send.
The consequences are
- the replication session will last a long time preventing others suppliers to send their own updates
- the replication session will be inefficient, sending few updates in a long delay
- Showing an false alarming replication lag with RUV comparison tools (a 3 months lag where actually this is a single update missing).
- risk of apparent replication breakage if the consumer closes the inactive replication connection (idletimeout or nsidletimeout)
Version-Release number of selected component (if applicable):
All version
How reproducible:
Steps to Reproduce:
1. 4 suppliers
2. configure idletimeout=15s
2. one update on all suppliers
3. multiple updates (200K) on 3 out 4 suppliers. One supplier without any update.
3. check all suppliers are in sync
4. update the last supplier.
5. wait 1min
6. do a single update on the 3 others
Actual results:
Likely the updates (6) are not replicated or with a long delay
Expected results:
replication should get in sync in few seconds.
Additional info:
An option is that each replica registers a slapi_eq_repeat task, that will do a dummy update on keep alive entry.
It should use a non indexed attribute (description ?). something like
dn: cn=keep alive 1, cn=<suffix>
objetclass:..
description: touch at 2022-07-29 13:34:19
Note that the upstream ticket is replication agreement focus. I think it could rather be replica oriented, like tombstone trimming thread (eq_cb_reap_tombstones).
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (389-ds-base bug fix and enhancement update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2023:2274