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I've recently visited this post where you can find the tag while clicking on it, the page "Tagged questions" says "0 questions tagged" and not showing the question that is tagged. Though, while hovering the mouse over tag, it shows 1 question.

screenshot

So, why is this page not showing the tagged question?

Note that the question is posted 14 hours ago (with respect to this post). so, delay in update of the page is not the issue.

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  • oh! same issue with this!
    – Pandya
    Jun 18, 2016 at 4:42

1 Answer 1

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Well, that would seem to be my fault; I think our newly deployed changes to the code that does all the tag filter / combination / exclusion code is having a hard time with newly added tags. If I use my dev console to see what it is doing:

Parsing query...
query parsed, 0ms
Warning (invalid tags): grahas

Parsing query...
query parsed, 0ms
Warning (invalid tags): jyotish

(and with no tags that it considers "valid", it jumps into a "no results" short-cut)

The really odd thing is: it definitely knew about the tag against the question:

{
 "Id": 13725,
 "LastActivityDate": "2016-06-17T14:08:24Z",
 "CreationDate": "2016-06-17T14:08:24Z",
 ...
 "Tags": "|vedanta|jyotish|grahas|"
}

I've done a "dump" of the raw memory so I can reproduce it locally (just waiting for it to copy over the network), and I've restarted the service which has made it notice it:

Parsing query...
query parsed, 0ms
Switching to All over Newest/grahas (1)
Searching >>>: (all) (Newest, 1 candidates)
Filter...
Filter complete, 0ms
1 matches using 1 work units and 1 threads, related tags calculated: True
ran to completion: True (0, 0.0 %, 0 of 1)
SortRelatedTags...
SortRelatedTags complete, 0ms
kept 3 of 3 (3 question-tags)

but: this is definitely a bug and will be fixed ASAP.

Update: should be fixed now; the problem was that in part of the logic we "pre-explode" the synonyms so that we can quickly go from any tag to the effective tag; when new tags were added, the pre-exploded value was left at a default value ("no tag") unless the synonyms were re-exploded, which would happen if the synonyms were changed in some way (or if the data was re-initialized). So the relevant code interpreted the newly added tags as though they hadn't been included.

We now do a better job of handling this when new tags are added!

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  • Now, I can see that the page is showing that question... Is there any changes made?
    – Pandya
    Jun 18, 2016 at 9:18
  • @Pandya "Is there any changes made?" - see "and I've restarted the service which has made it notice it"; my current hypothesis is that a bit of code to update the counts against each tag is being bypassed in some scenario (it should run whenever the data changes)
    – Marc Gravell
    Jun 18, 2016 at 9:21
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    @Pandya absolutely! "this is definitely a bug and will be fixed ASAP" - if it is obvious I might get it done shortly, but: worst case it'll be my number one priority on Monday.
    – Marc Gravell
    Jun 18, 2016 at 9:32
  • May I know if it somehow affected older tags? A recent question on Meta Android.SE is currently not shown on questions list.
    – Meta Andrew T.
    Jun 18, 2016 at 15:39
  • @meatball not the same thing, but yes, there appears to be a difference there too; investigating (fixed for now)
    – Marc Gravell
    Jun 18, 2016 at 17:20
  • @meatball heh, after a lot of searching, it was an "off by one" error; basically, we dropped exactly one question when we loaded the engine. Thanks for spotting that - in this case, 2173 was the last question on the site, hence it fell between the cracks. Pushing out a fix.
    – Marc Gravell
    Jun 18, 2016 at 23:07
  • @MarcGravell thanks for the quick fix, cheers!
    – Meta Andrew T.
    Jun 18, 2016 at 23:16
  • @meatball what else was I going to do with a Saturday, eh? ;)
    – Marc Gravell
    Jun 18, 2016 at 23:23

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