Details
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Type:
New Feature
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Status: Closed
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Priority:
Major - P3
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Resolution: Fixed
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Affects Version/s: None
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Fix Version/s: WT2.6.1
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Labels:None
Description
Mathias Stearn asks:
Currently, we implement our "j:true" write concern by passing "sync=true" to begin_transaction(), which causes commit_transaction() to block until durable. Unfortunately, this doesn't allow us to do anything else on that thread while we wait. In particular, when a user specifies both "w:majority" and "j:true" it would be nice to be able to wait for both replication and journaling at the same time.
This is a reasonable request and I'll look into an API that implements this. Although not directly related it is in the same ballpark as WT-1754.
Activity
Author:
{u'username': u'sueloverso', u'name': u'Susan LoVerso', u'email': u'sue@wiredtiger.com'}Message: Add example code for background sync. WT-1908
Branch: develop
https://github.com/wiredtiger/wiredtiger/commit/b73ef6808942deaad5f37fd16bcb4cf371b197ca
Author:
{u'username': u'sueloverso', u'name': u'Susan LoVerso', u'email': u'sue@wiredtiger.com'}Message: Refactor setting background sync LSN to its own functions. WT-1908
Branch: develop
https://github.com/wiredtiger/wiredtiger/commit/78a2e9c80a1287a07983fa1b0351f1dcf08e0b22
Author:
{u'username': u'sueloverso', u'name': u'Susan LoVerso', u'email': u'sue@wiredtiger.com'}Message: Make default transaction_sync timeout to be forever. WT-1908
Branch: develop
https://github.com/wiredtiger/wiredtiger/commit/d3b914224f99eb90ba574c72cf7d6b36a0264718
Author:
{u'username': u'sueloverso', u'name': u'Susan LoVerso', u'email': u'sue@wiredtiger.com'}Message: The log_close_server handles more than closing. Rename function and
fields. WT-1908
Branch: develop
https://github.com/wiredtiger/wiredtiger/commit/f1be38004d13c02a4b30ff5db78689fce03778ef
Author:
{u'username': u'michaelcahill', u'name': u'Michael Cahill', u'email': u'michael.cahill@mongodb.com'}Message: Merge pull request #1943 from wiredtiger/transaction-background
Add a background transaction sync mechanism. WT-1908
Branch: develop
https://github.com/wiredtiger/wiredtiger/commit/5258cbc9c39616778b3a7fd9f3f5bc37ebb24e0d
Michael Cahill I have created a pull request with one possible implementation for this feature. I added a new type of sync method to the transaction_sync configuration list called "background". I also added a WT_SESSION::transaction_sync API with a timeout to check for whether it is sync'ed. Let me know what you think.