[SERVER-26356] disallow support for linearizable reads with pv0 Created: 27/Sep/16  Updated: 19/Nov/16  Resolved: 15/Nov/16

Status: Closed
Project: Core Server
Component/s: Replication
Affects Version/s: None
Fix Version/s: 3.4.0-rc4

Type: Task Priority: Major - P3
Reporter: Eric Milkie Assignee: Judah Schvimer
Resolution: Done Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Related
is related to SERVER-27025 enable linearizable read concern and ... Closed
Backwards Compatibility: Fully Compatible
Sprint: Repl 2016-11-21
Participants:

 Comments   
Comment by Githook User [ 15/Nov/16 ]

Author:

{u'username': u'judahschvimer', u'name': u'Judah Schvimer', u'email': u'judah@mongodb.com'}

Message: SERVER-26356 disable linearizable read concern with pv0
Branch: master
https://github.com/mongodb/mongo/commit/84d33796a712e389395df98cca13c9e88f9490b1

Comment by Judah Schvimer [ 28/Oct/16 ]

The linearizable read test fails with PV0 because it assumes that a partitioned primary will stay primary for a minute, during which we test that a linearizable read fails. In PV0 the partitioned primary steps down much faster. We should replace this test (or add an extra test) that has a primary, secondary, and arbiter, and puts a partition between the secondary and the other two nodes. This way the primary stays primary but can't satisfy linearizable reads. Alternatively we can just pause replication on two of the secondaries instead of creating a partition. Both of these tests are implementation specific to some extent, which could be one negative.

Comment by Judah Schvimer [ 26/Oct/16 ]

If we don't enable the tests, we need to disallow support for pv0.

Comment by Eric Milkie [ 14/Oct/16 ]

I almost got this working except that apply_batch_only_goes_forward.js hangs in the replica_set_legacy suite. I didn't get a chance to debug why, but I am concerned that it is a real deadlock.

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