[Kde-pim] Review Request 111885: Avoid starting a database transaction in CollectionSync when no updates are needed

[Kevin Krammer]

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akonadi/collectionsync.cpp
<http://git.reviewboard.kde.org/r/111885/#comment27482>

    that doesn't quite match what the method does. It returns true if they nodes are different in some way



akonadi/collectionsync.cpp
<http://git.reviewboard.kde.org/r/111885/#comment27483>

    maybe early exit once the result is certain, avoiding all further checks?


- Kevin Krammer


On Aug. 5, 2013, 11:48 a.m., Alessandro Pignotti wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> http://git.reviewboard.kde.org/r/111885/
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> 
> (Updated Aug. 5, 2013, 11:48 a.m.)
> 
> 
> Review request for Akonadi.
> 
> 
> Description
> -------
> 
> Rationale: Unconditionally starting a transaction on every collection
> sync has an high overhead on disk activity since transaction bookkeping
> on the database requires writing to disk. Most often collection sync are
> unnecessary since collection are rarely modified, so we end up causing a
> write to disk on an operation which would be read-only.
> 
> The proposed solution is two run the collection sync in 2 phases:
> 
> 1) Without starting a transaction, the currently known local collections
> are loaded and are compared against the received remote ones. If no
> difference is found update is stopped right away
> 
> 2) If there are differences a transaction is started, local collections
> are loaded again to guarantee consistency and the update is applied
> inside the transaction
> 
> 
> This addresses bug 322083.
>     http://bugs.kde.org/show_bug.cgi?id=322083
> 
> 
> Diffs
> -----
> 
>   akonadi/collectionsync.cpp 0b85c2be168511486b484c7fcf8de3d157e876d4 
>   akonadi/collectionsync_p.h 2ea53c5e0f2d2ce8e1a684b8f685ab6683cd1493 
> 
> Diff: http://git.reviewboard.kde.org/r/111885/diff/
> 
> 
> Testing
> -------
> 
> Code builds and collection fetching seems to be working correctly
> 
> 
> Thanks,
> 
> Alessandro Pignotti
> 
>

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