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make NextCloud WORM file system friendly #24596

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merged 3 commits into from
Sep 16, 2022
Merged

make NextCloud WORM file system friendly #24596

merged 3 commits into from
Sep 16, 2022

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kofemann
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@kofemann kofemann commented Dec 7, 2020

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@kofemann kofemann changed the title Dcache worm make NextCloud WORM file system friendly Dec 7, 2020
@kofemann kofemann mentioned this pull request Dec 7, 2020
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@kofemann kofemann force-pushed the dcache-worm branch 2 times, most recently from 8136009 to 75b3261 Compare December 22, 2020 10:28
@rullzer
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rullzer commented Feb 11, 2021

@kofemann as far I know you have been running with this in production for some time now right?
Any reason this PR is still a draft?

@kofemann
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@rullzer We would like to run some tests to validate that other things (like apps) are not broken. Do you have a testsuite that we can run locally?

@PVince81
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the code looks fine to me in general, I'm hoping that the extra unlink will not cause much extra overhead, but we're talking about local storage anyway so should be fine. @icewind1991 thoughts ?

@PVince81
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@kofemann please rebase and resolve the conflicts

@PVince81
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regarding tests, at least the ones with regular storage, are already running in our CI so if something is broken we'll likely see this immediately

@kofemann
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@PVince81 Thanks for the update. Actually, since 2 weeks we run this code with nextcloud 22.2.3 in a production. Up to now we haven't seen any issues.

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@PVince81 Thanks for the update. Actually, since 2 weeks we run this code with nextcloud 22.2.3 in a production. Up to now we haven't seen any issues.

that's great to hear! I took the liberty to click "ready for review"

@PVince81 PVince81 marked this pull request as ready for review January 28, 2022 14:38
@PVince81 PVince81 self-assigned this Jan 28, 2022
@szaimen szaimen added 3. to review Waiting for reviews enhancement labels Jan 31, 2022
@szaimen szaimen added this to the Nextcloud 24 milestone Jan 31, 2022
@PVince81
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PVince81 commented Feb 7, 2022

some strange errors in multiple places:

1) Test\Cache\FileCacheTest::testGarbageCollectLeaveRecentKeys
InvalidArgumentException: Username is invalid because files already exist for this user

I'm wondering if the change in this PR somehow interferes with test cleanup, but I can't see how

@kofemann
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kofemann commented Feb 7, 2022

This is obviously something that I have to look at. Is it possible to run the test manually?

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PVince81 commented Feb 7, 2022

This is obviously something that I have to look at. Is it possible to run the test manually?

see https://docs.nextcloud.com/server/latest/developer_manual/core/unit-testing.html#bootstrapping-nextcloud

this is how I usually test locally:
./autotest.sh sqlite tests/lib/Cache/FileCacheTest.php

@icewind1991
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I would expect a filesystem to be smart enough to handle the "truncate an existing file and write to it" case, but I'm fine adding some logic for it.

It should only unlink if the file already exists though.

icewind1991
icewind1991 requested changes Feb 15, 2022
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Please add a check if the file exists before deleting it

@skjnldsv skjnldsv mentioned this pull request Mar 24, 2022
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@blizzz blizzz mentioned this pull request Mar 31, 2022
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@kofemann
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I have added a coifing option control this behavior. A check before unlink will issue unnecessary stat call.

@blizzz blizzz mentioned this pull request Apr 7, 2022
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@blizzz blizzz mentioned this pull request Apr 13, 2022
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@kofemann
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@icewind1991 any plans to include this into NC24?

@blizzz blizzz modified the milestones: Nextcloud 24, Nextcloud 25 Apr 21, 2022
This was referenced Aug 12, 2022
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@kofemann
files: make OC\Files\Storage\Local WORM friendly
b6065a2 
Some filesystems run as a Write-Once-Read-Many storages. This
makes them impossible to use with NexeCloud, as the file system
layers uses `truncate` syscall (through file_put_contents function).

As Nextcloud is never updates existing files, removing the old entry
and creatint a new one on update will allow NextCoud to update on such
file systems.

Update Local#fopen and Local#file_put_contents to remote existing
file before truncating.

Signed-off-by: Tigran Mkrtchyan <[email protected]>
@kofemann kofemann force-pushed the dcache-worm branch 3 times, most recently from 677382f to 9bf9c94 Compare August 25, 2022 09:37
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rebased on top of current master

This was referenced Aug 30, 2022
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@blizzz blizzz mentioned this pull request Sep 9, 2022
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@skjnldsv skjnldsv mentioned this pull request Sep 15, 2022
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PVince81
PVince81 approved these changes Sep 16, 2022
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👍

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@kofemann the code looks fine. please sign off your commits, see https://github.com/nextcloud/server/pull/24596/checks?check_run_id=8012932504

I'll try and find a second reviewer to get this in. thanks!

CarlSchwan
CarlSchwan approved these changes Sep 16, 2022
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lib/private/Files/Storage/Local.php Outdated Show resolved Hide resolved
@kofemann
config: add a switch to control truncate before update
f41209a 
To avoid extra truncate on non WORM file systems, add a new config
option `localstorage.unlink_on_truncate`, which defaults to false.

The OC\Files\Storage\Local is update to respect that option.

Signed-off-by: Tigran Mkrtchyan <[email protected]>
@PVince81 PVince81 added 4. to release Ready to be released and/or waiting for tests to finish and removed 3. to review Waiting for reviews labels Sep 16, 2022
@PVince81 PVince81 merged commit 1025d04 into nextcloud:master Sep 16, 2022
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@CarlSchwan CarlSchwan CarlSchwan approved these changes

@PVince81 PVince81 PVince81 approved these changes

@artonge artonge Awaiting requested review from artonge

@icewind1991 icewind1991 Awaiting requested review from icewind1991

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@PVince81 PVince81

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7 participants
@kofemann @rullzer @PVince81 @icewind1991 @CarlSchwan @blizzz @szaimen