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Type: Improvement
Resolution: Fixed
Priority: Major - P3
Fix Version/s: 8.3.0-rc0, 8.2.7, 8.0.24
Affects Version/s: None
Component/s: None
Labels:
- range-deleter-improvements

Assigned Teams:

Cluster Scalability
Backwards Compatibility:
Fully Compatible
Backport Requested:

v8.2, v8.0
Sprint:
ClusterScalability Jan5-Jan19, ClusterScalability 19Jan-2Feb, ClusterScalability 2Feb-16Feb
Case:
Linked BF Score:
200
Story Points:
3
CAR Domain/s:
None

Aha! Reference:
None
Tracking Level:
None
Risk Status:
None
Exec Notes:
None
Goal Name(s):
None
Goal Link:
None

Today, when a cluster transitions from embedded to dedicated config servers we use transitionToDedicatedConfigServer() which uses removeShard().

We drain sharded collections and then use range deletions to remove any data from the embedded config server safely in case it gets added back to the cluster as a config shard. For any other removeShard operation, we don't complete range deletions because the shard will be removed.

Waiting on range deletions to transition to dedicated config servers is unnecessary. Atlas cannot complete the transition and reduce the tier to an M30 for a config server until range deletions are complete which can be very slow and resource intensive.

causes

SERVER-125663 Orphans accumulate after transitionToDedicatedConfigServer races with migration commit to drop config.rangeDeletions

Backlog

SERVER-119117 Exclusion of pending range deletions in transition to dedicated progress check can cause commit to fail

Closed

is depended on by

SERVER-125950 transitionToDedicated then transitionToConfigShard can lose the range deleter task collection index

Closed

TOOLS-4077 Investigate changes in SERVER-103990: Skip range deletions when transitioning from embedded to dedicated config servers

Closed

is related to

SERVER-77359 Allow enabling/disabling the range deleter at runtime

Closed

related to

SERVER-125663 Orphans accumulate after transitionToDedicatedConfigServer races with migration commit to drop config.rangeDeletions

Backlog

SERVER-115742 Presence of system.profile collections impairs transitionToDedicated completion

Closed

SERVER-125865 Revert "Skip range deletions when transitioning from embedded to dedicated config servers"

Closed

SERVER-70909 Avoid range deletions while draining a shard that is being removed

Closed

SERVER-118856 Circular dependency prevents active query checking during transitionToDedicatedConfigServer orphan cleanup

Blocked

SERVER-120946 Stop range deleter service when transitioning to dedicated config server

Needs Scheduling

(6 related to)

Assignee:: Abdul Qadeer
Reporter:: Ratika Gandhi
Participants:: Abdul Qadeer, Githook User, Ratika Gandhi
Votes:: 1 Vote for this issue
Watchers:: 15 Start watching this issue

Created:: Apr 17 2025 07:53:26 PM UTC
Updated:: May 07 2026 09:01:04 PM UTC
Resolved:: Feb 04 2026 02:38:49 PM UTC

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