[SERVER-28808] (v3.2) applyChunkOpsDeprecated should do a write before trying to confirm the migration commit (applyOps) succeeded despite errors Created: 14/Apr/17  Updated: 29/Jan/18  Resolved: 08/May/17

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

Type: Bug Priority: Major - P3
Reporter: Dianna Hohensee (Inactive) Assignee: Dianna Hohensee (Inactive)
Resolution: Won't Fix Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Duplicate
duplicates SERVER-23944 Failure to commit chunk migration due... Closed
Backwards Compatibility: Fully Compatible
Operating System: ALL
Sprint: Sharding 2017-05-08, Sharding 2017-05-29
Participants:

 Description   

BF-5149 (v3.2 failure) is an fassert in the migration critical section, where the shard cannot tell whether the commit was successful or not. This is because it tries to check whether the applyOps succeeded or not by doing a followup query. However, this query can be sent to secondaries, and the shard does not always have the latest config opTime to make sure what is seen on the secondary is the latest information.

v3.4 changes the behavior by trying to do a successful write to the config primary, so as the acquire the latest config opTime, before sending the query that can target secondaries. We could add the same thing to v3.2.

This solution doesn't cover all edge cases. For v3.6, we intend to do SERVER-26886 to eliminate the fassert potential, but we don't currently have any intentions for backport of such a fix.



 Comments   
Comment by Dianna Hohensee (Inactive) [ 08/May/17 ]

Closing as won't fix. The dependent BFs have been marked as trivial. Any new related v3.2 BFs should be marked as trivial as well.

Comment by Kaloian Manassiev [ 18/Apr/17 ]

Since it is only 3.2 we won't fix it. Assigning to Dianna to close and figure out what to do with the build failures.

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