[SERVER-36095] Remove support for parallel initial sync Created: 12/Jul/18  Updated: 20/Aug/18  Resolved: 20/Aug/18

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

Type: Task Priority: Major - P3
Reporter: Tess Avitabile (Inactive) Assignee: Matthew Russotto
Resolution: Duplicate Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Depends
is depended on by SERVER-36096 Convert CollectionCloner to use DBCli... Closed
Duplicate
duplicates SERVER-33998 Remove the parallelCollectionScan com... Closed
Sprint: Repl 2018-07-30, Repl 2018-08-13, Repl 2018-08-27
Participants:

 Description   

There is unused code for using parallelCollectionScan in the CollectionCloner for initial sync. This was possible using the AsyncResultsMerger, which supports sending getMore commands for multiple cursors and processing the results asynchronously. However, for the Faster Initial Sync project, we are rewriting the CollectionCloner to use DBClientConnection. In order to support multiple cursors with DBClientConnection, we would need to create multiple data cloning threads. This is not worthwhile, since we are not currently using this functionality. WiredTiger does not support parallelCollectionScan and has no plans to do so.


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