Don't calculate deltas when viewing issues because that's done in a task

When an upload completes, it kicks off a task to calculate deltas.  So, there is no reason to do the same work when viewing the code review issue.

Since calculating deltas is done in a task, it has a deadline of 10 minutes and automatically retries, so there is no need to implement our own retry logic or to display an error message to the user.

Calculating deltas while the base files were still being uploaded (because the user views the issue while still uploading) caused a race condition that over-wrote the patch in a non-transactional way.  Delta calculation in a task does not have that risk because the task is only enqueue after the upload is complete.

BUG=https://code.google.com/p/rietveld/issues/detail?id=357

[jrobbins (corp), 2014-07-15 19:58:35]

PTAL.  This should avoid some corrupted code review issues.

[iannucci, 2014-07-17 18:37:22]

lgtm. I assume that this means that the delta links will just not be visible
until the task queue task completes?

Would it be better to have a cron job which just looks for all Patchsets which
have deltas_calculated=False? Then the immediate task queue is an optimization
over the cron job, but the system will stabilize towards a good state.

[jrobbins (corp), 2014-07-17 18:56:38]

On 2014/07/17 18:37:22, iannucci wrote:
> lgtm. I assume that this means that the delta links will just not be visible
> until the task queue task completes?

Right, if you view the issue while still uploading or immediately after, the
"Delta from patch set" column is just empty for a little while.

> Would it be better to have a cron job which just looks for all Patchsets which
> have deltas_calculated=False? Then the immediate task queue is an optimization
> over the cron job, but the system will stabilize towards a good state.

Good point, I'll add a TODO to consider adding a cron job in the future.  I
think the idea definitely has potential, but on the downside, it adds complexity
and potentially masks failures that should be noticed and fixed.  I think we
always need the task because people tend to upload and then view the diff online
soon after.

[iannucci, 2014-07-17 19:02:26]

On 2014/07/17 18:56:38, jrobbins (corp) wrote:
> On 2014/07/17 18:37:22, iannucci wrote:
> > lgtm. I assume that this means that the delta links will just not be visible
> > until the task queue task completes?
> 
> Right, if you view the issue while still uploading or immediately after, the
> "Delta from patch set" column is just empty for a little while.
> 
> > Would it be better to have a cron job which just looks for all Patchsets
which
> > have deltas_calculated=False? Then the immediate task queue is an
optimization
> > over the cron job, but the system will stabilize towards a good state.
> 
> Good point, I'll add a TODO to consider adding a cron job in the future.  I
> think the idea definitely has potential, but on the downside, it adds
complexity
> and potentially masks failures that should be noticed and fixed.  I think we
> always need the task because people tend to upload and then view the diff
online
> soon after.

Fair point. If things were more transaction-oriented I think the task queue
tasks would be fine (since you can transactionally queue a task along with the
data store writes).

[jrobbins (corp), 2014-07-17 19:20:06]

Committed as
https://code.google.com/p/rietveld/source/detail?r=bdb32f6d8b0922d3c417659e27...

[mcourtney1961, 2018-06-10 21:39:14]

On 2014/07/15 19:58:35, jrobbins (corp) wrote:
> PTAL.  This should avoid some corrupted code review issues.

Cool thank you!

[mcourtney1961, 2018-06-10 21:40:29]

On 2014/07/17 18:37:22, iannucci wrote:
> lgtm. I assume that this means that the delta links will just not be visible
> until the task queue task completes?
> 
> Would it be better to have a cron job which just looks for all Patchsets which
> have deltas_calculated=False? Then the immediate task queue is an optimization
> over the cron job, but the system will stabilize towards a good state.

Ifk!

[lehmanpstrik, 2021-07-07 00:41:22]

On 2018/06/10 21:40:29, mcourtney1961 wrote:
> On 2014/07/17 18:37:22, iannucci wrote:
> > lgtm. I assume that this means that the delta links will just not be visible
> > until the task queue task completes?
> > 
> > Would it be better to have a cron job which just looks for all Patchsets
which
> > have deltas_calculated=False? Then the immediate task queue is an
optimization
> > over the cron job, but the system will stabilize towards a good state.
> 
> Ifk!

[lehmanpstrik, 2021-08-06 02:29:37]

Shop are u


Holen Sie sich Outlook für Android<https://aka.ms/AAb9ysg>
________________________________
From: lehmanpstrik@gmail.com <lehmanpstrik@gmail.com>
Sent: Wednesday, July 7, 2021 1:41:22 AM
To: jrobbins@chromium.org <jrobbins@chromium.org>; iannucci@chromium.org
<iannucci@chromium.org>; jrobbins@google.com <jrobbins@google.com>;
ajaramillo1629@gmail.com <ajaramillo1629@gmail.com>; mcourtney1961@yahoo.com
<mcourtney1961@yahoo.com>
Cc: codereview-list@groups.google.com <codereview-list@groups.google.com>;
reply@codereview-hr.appspotmail.com <reply@codereview-hr.appspotmail.com>
Subject: Re: Don't calculate deltas when viewing issues because that's done in a
task (issue 112320044 by jrobbins@chromium.org)

On 2018/06/10 21:40:29, mcourtney1961 wrote:
> On 2014/07/17 18:37:22, iannucci wrote:
> > lgtm. I assume that this means that the delta links will just not be
visible
> > until the task queue task completes?
> >
> > Would it be better to have a cron job which just looks for all
Patchsets which
> > have deltas_calculated=False? Then the immediate task queue is an
optimization
> > over the cron job, but the system will stabilize towards a good
state.
>
> Ifk!



https://codereview.appspot.com/112320044/

[rheysiahwati, 2022-10-07 15:40:52]

Minta kode

[riswanceggu, 2022-10-07 16:30:42]

Kode whatsapp

[yaninabeatriz30, 2023-04-14 06:44:44]

On 2015/06/05 00:13:16, ajaramillo1629 wrote: