Fix revision cooking errors with the vault for large revision log
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Authored by anlambert on Jul 26 2019, 5:26 PM.

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ardumont
douardda

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rDVAU9f673806699a: cookers.revision_*: Fix storage timeouts when fetching a large revision log

Summary

This fixes a vault issue similar to a one that happened when cooking a directory (T1177).

When cooking a gitfast archive for a given revision, fetching the associated revision log
must be performed client-side in a paginated way to avoid storage timeouts when the total
number of revisions to fetch is pretty large.

Related T1934

Diff Detail

Repository

rDVAU Software Heritage Vault

Branch

fix-revision-cooking-timeout

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Buildable 7046
Build 9925: tox-on-jenkins	Jenkins
Build 9924: arc lint + arc unit

Event Timeline

anlambert created this revision.Jul 26 2019, 5:26 PM

Herald added a reviewer: Reviewers. · View Herald TranscriptJul 26 2019, 5:26 PM

Build is green
See https://jenkins.softwareheritage.org/job/DVAU/job/tox/84/ for more details.

Harbormaster completed remote builds in B7045: Diff 6005.Jul 26 2019, 5:28 PM

anlambert retitled this revision from Fix revision cooking errors in the vault for large revision log to Fix revision cooking errors with the vault for large revision log.Jul 26 2019, 5:28 PM

Update: Add missing Yields section in docstring

Build is green
See https://jenkins.softwareheritage.org/job/DVAU/job/tox/86/ for more details.

Harbormaster completed remote builds in B7046: Diff 6006.Jul 26 2019, 5:35 PM

ardumont added a subscriber: ardumont.Jul 26 2019, 6:14 PM

ardumont added inline comments.

swh/vault/cookers/utils.py
28	Wouldn't that bubble up (since you increment it below) when the revisions are numerous? I'd call that function with `max_revs=per_page`. What did i miss?

For the sake of my question ;)

Other than that sounds good.

This revision now requires changes to proceed.Jul 26 2019, 6:19 PM

anlambert added inline comments.Jul 26 2019, 7:01 PM

swh/vault/cookers/utils.py
28	Nope, it will work as expected. `get_revisions_walker` instantiates a revision iterator, the important part here is the `state` parameter enabling to continue the iteration from where you left it the last time you used it. As I can't guess the number of revisions to walk, I am forced to continually increment the `max_revs` parameter. But the number of revisions returned at each iteration step will be `per_page` or less if we hit the initial revision in the log.

anlambert added inline comments.Jul 26 2019, 7:05 PM

swh/vault/cookers/utils.py
28	~~But the number of revisions returned at each iteration step will be per_page or less if we hit the initial revision in the log.~~ But the number of revisions returned by each instantiated iterator will be `per_page` or less if we hit the initial revision in the log. This is clearer ;-)

ardumont accepted this revision.Jul 26 2019, 8:37 PM

ardumont added inline comments.

swh/vault/cookers/utils.py
28	Ok, thanks for the clarification. (I remembered the state was important ;)

This revision is now accepted and ready to land.Jul 26 2019, 8:37 PM

I'm not against this diff as quick solution for the problem, but I'm disappointed that this pagination stuff is not properly managed in the (client part) storage itself. What the point of having a client implementation of the storage if we do not abstract these kind of 'basic' behaviors?