[SERVER-50119] Create merged oplog buffer iterator for resharding Created: 05/Aug/20  Updated: 06/Dec/22  Resolved: 02/Nov/20

Status: Closed
Project: Core Server
Component/s: Sharding
Affects Version/s: None
Fix Version/s: None

Type: Task Priority: Major - P3
Reporter: Max Hirschhorn Assignee: [DO NOT USE] Backlog - Sharding Team
Resolution: Won't Do Votes: 0
Labels: PM-234-M2, PM-234-T-oplog-apply
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Gantt Dependency
has to be done after SERVER-50118 Create oplog buffer iterator for resh... Closed
Assigned Teams:
Sharding
Participants:

 Description   

Each oplog buffer iterator represents an _id-sorted stream on the oplog buffer collection for a particular donor shard. The oplog buffer iterators for all donor shards should be merged together as a single _id-sorted stream. Consider reusing the AsyncResultsMerger or pieces of it.



 Comments   
Comment by Max Hirschhorn [ 02/Nov/20 ]

The oplog application rules for resharding permit the oplog entries from each donor shard to be applied independently. There is no longer a need to merge the oplog buffer iterators.

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