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locking problem

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Joey Hess 2019-03-07 15:22:23 -04:00
parent 4efd431136
commit 7e35c81ada
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18
doc/todo/import_tree.mdwn
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@ -10,6 +10,24 @@ this.
## implementation notes ## implementation notes
* updateExportTreeFromLog deadlocks when running git-annex export because
it locks the export db first.
Could switch to fine-grained locking, but Command.Export would need to
lock and flush writes to the database many times, and that may be too
expensive.
How about this: Make an action that waits to lock the export db and
runs updateExportTreeFromLog. While the update is running take an
exclusive lock on an update lock file. Only lock the database using that,
in Command.Export etc.
Then, in ExportImport, it only has to try to run that action;
if the action fails due to the lock being held by the same or another
process, it suffices to take a shared lock of the update lock file
(and immediately release it), in order to wait for the update to
complete.
* Need to support annex-tracking-branch configuration, which documentation * Need to support annex-tracking-branch configuration, which documentation
says makes git-annex sync and assistant do imports. says makes git-annex sync and assistant do imports.