determine storageEngine specificity in docs (DOCS-4856)

[DOCS-5141] can you document more behavior for read isolation Created: 31/Mar/15  Updated: 11/Jan/17  Resolved: 21/May/15

Status: Closed
Project: Documentation
Component/s: Server
Affects Version/s: None
Fix Version/s: 01112017-cleanup

Type: Sub-task Priority: Major - P3
Reporter: Mark Callaghan Assignee: David Storch
Resolution: Done Votes: 0
Labels: pull-request
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Related
related to DOCS-5259 Audit read-preference sections Closed
is related to SERVER-17975 Stale reads with WriteConcern Majorit... Closed
Participants:
Days since reply: 8 years, 39 weeks ago

 Description   

Cursor/transaction isolation is more interesting now that we have mmapv1, WiredTiger and RocksDB. Some doc updates have been done:
https://jira.mongodb.org/browse/DOCS-4681
https://jira.mongodb.org/browse/DOCS-2908

Can we also update the docs to state that WiredTiger uses a snapshot per network call for queries as Dan mentions here?
https://groups.google.com/forum/#!topic/mongodb-dev/XXk-OsujsKw



 Comments   
Comment by Githook User [ 21/May/15 ]

Author:

{u'username': u'dstorch', u'name': u'David Storch', u'email': u'david.storch@10gen.com'}

Message: DOCS-5141 clean up documentation of isolation guarantees

Signed-off-by: kay <kay.kim@10gen.com>
Branch: v2.6
https://github.com/mongodb/docs/commit/aecfb5918c342f7f744f324e1130d6ea5be9eba8

Comment by Githook User [ 21/May/15 ]

Author:

{u'username': u'dstorch', u'name': u'David Storch', u'email': u'david.storch@10gen.com'}

Message: DOCS-5141 clean up documentation of isolation guarantees

Signed-off-by: kay <kay.kim@10gen.com>
Branch: master
https://github.com/mongodb/docs/commit/0e81c4fcb8b140fa84aeca510c491ea005c5ecc7

Comment by Daniel Pasette (Inactive) [ 03/Apr/15 ]

Hi Mark,
Sorry about the confusion, at the time I made that statement (on Dec. 4th) it was true that WT used a snapshot per network roundtrip. We had to later introduce yielding within each roundtrip late that month. We will update the Concurrency FAQ to make it a bit more clear and add some more examples, but in essence, both MMAP and WT provide the same read isolation guarantees in 3.0.

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