| Commit message (Collapse) | Author | Age |
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Also fixed a bug in makeRunner; run' leaves the mvar empty so have to
refill it.
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Writes are optimised by queueing up multiple writes when possible.
The queue is flushed after the Annex monad action finishes. That makes it
happen on program termination, and also whenever a nested Annex monad action
finishes.
Reads are optimised by checking once (per AnnexState) if the database
exists. If the database doesn't exist yet, all reads return mempty.
Reads also cause queued writes to be flushed, so reads will always be
consistent with writes (as long as they're made inside the same Annex monad).
A future optimisation path would be to determine when that's not necessary,
which is probably most of the time, and avoid flushing unncessarily.
Design notes for this commit:
- separate reads from writes
- reuse a handle which is left open until program
exit or until the MVar goes out of scope (and autoclosed then)
- writes are queued
- queue is flushed periodically
- immediate queue flush before any read
- auto-flush queue when database handle is garbage collected
- flush queue on exit from Annex monad
(Note that this may happen repeatedly for a single database connection;
or a connection may be reused for multiple Annex monad actions,
possibly even concurrent ones.)
- if database does not exist (or is empty) the handle
is not opened by reads; reads instead return empty results
- writes open the handle if it was not open previously
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Fsck can use the queue for efficiency since it is write-heavy, and only
reads a value before writing it. But, the queue is not suited to the Keys
database.
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In v6 unlocked mode, this fixes a problem that was making eg,
echo > file cause the assistant to copy the file to the annex object,
instead of hard linking it. That because 2 change events were seen
(one for opening the file and one for closing) and processed together
the file was then locked down twice. Which meant it had mutiple hard links,
and so prevented linkAnnex from hard linking it.
There might be scenarios where multiple events come in, but staggered such
that a file gets locked down repeatedly, and it would still be copied to
the annex object in that case.
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This can happen when ingesting a new file in either locked or unlocked
mode, when some unlocked files in the repo use the same key, and the
content was not locally available before.
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Seems to basically work now!
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This fixes a race where the modified file ended up in annex/objects, and
the InodeCache stored in the database was for the modified version, so
git-annex didn't know it had gotten modified.
The race could occur when the smudge filter was running; now it gets the
InodeCache before generating the Key, which avoids the race.
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no behavior changes
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Files are not yet added to v6 repos in unlocked mode.
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Caused by AMP.. Since I've finally upgraded my dev laptop to 7.10,
I may start missing imports that are not needed with it but are with older
versions..
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were present. Probably caused by a change to what git status displays in this situation. Fixed by treating files git thinks are modified the same as typechanged files.
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Joey Hess
https://me.yahoo.com/a/EbvxpTI_xP9Aod7Mg4cwGhgjrCrdM5s-#7c0f4
frost.kristian@75a6b6a25121f985cd8708f98c691d41716ac720
cbaines
https://openid.stackexchange.com/user/e65e6d0e-58ba-41de-84cc-1f2ba54cf574
jhannwong@c9c7a67b5632a4bbc0c959cfeb3d340e02f28565
sts