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Maniphest T76689

Duplicate roots for some view-topiclist rev API requests
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Description

There is some kind of issue that can cause duplicate roots (topics) in view-topiclist requests. I noticed it when working on https://gerrit.wikimedia.org/r/#/c/170998/ , but it turns out that it's present on master and even production.

Production example: https://www.mediawiki.org/w/api.php?action=flow&format=jsonfm&page=Talk%3AFlow_QA&submodule=view-topiclist&vtloffset-dir=rev&vtllimit=10&vtloffset-id=rqe9hb1t8yarz97m

Paste for posterity:

P124 Masterwork From Distant Lands
1{
2 "flow": {
3 "view-topiclist": {
4 "result": {
5 "topiclist": {
6 "submitted": {
7 "offset-dir": "rev",
8 "sortby": "newest",
9 "savesortby": false,
10 "offset-id": "rqe9hb1t8yarz97m",
11 "offset": null,
12 "limit": 10,
13 "render": false,
14 "toconly": false
15 },
16 "errors": [],
17 "sortby": "",
18 "workflowId": "rl7itnpkdbwa8b5w",
19 "roots": [
20 "ry51fussyfpos7k9",
21 "ry4n6b5cpy6y9o4h",
22 "rs9l9vau450s2nvr",
23 "rqgvx99tpd5njsdj",
24 "s0f6tno1s2qnzx47",
25 "ry62pq3us5tys0ra",
26 "ry51fussyfpos7k9",
27 "ry4n6b5cpy6y9o4h",
28 "rs9l9vau450s2nvr",
29 "rqgvx99tpd5njsdj"
30 ],
31 "posts": {
32 "ry51fussyfpos7k9": [
33 "ry51fusuik5c4ea1"
34 ],
35 "ry51fusw2okzgkzt": [
36 "ry51fusw2okzgkzt"
37 ],
38 "ry4n6b5cpy6y9o4h": [
39 "ry4n6b5ea2mlluu9"
40 ],
41 "ry4n6b5fu728y1k1": [
42 "ry4n6b5fu728y1k1"
43 ],
44 "rs9l9vau450s2nvr": [
45 "rs9l9vavo9gfeulj"
46 ],
47 "rs9l9vavobfgiwkn": [
48 "rs9l9vavobfgiwkn"
49 ],
50 "rs9lajhsbpq7kjfo": [
51 "rs9lajhsbpq7kjfo"
52 ],
53 "ry4ind992ypo37j2": [
54 "ry4ind992ypo37j2"
55 ],
56 "rqgvx99tpd5njsdj": [
57 "s1cjhwxz5ltcxlr6"
58 ],
59 "rqgvx99ydqglkciv": [
60 "rqgvx99ydqglkciv"
61 ],
62 "s0f6tno1s2qnzx47": [
63 "s0f6tno6gg1m0h9j"
64 ],
65 "s0f6tno6gi0n4j8n": [
66 "s0f6tno6gi0n4j8n"
67 ],
68 "ry62pq3us5tys0ra": [
69 "ry62pq3wca9m47h2"
70 ],
71 "ry62pq3zgj4wskwm": [
72 "ry62pq3zgj4wskwm"
73 ]
74 },
75 "revisions": {
76 "ry51fusuik5c4ea1": {
77 "workflowId": "ry51fussyfpos7k9",
78 "revisionId": "ry51fusuik5c4ea1",
79 "timestamp": "20140708232334",
80 "changeType": "new-post",
81 "dateFormats": [],
82 "properties": {
83 "topic-of-post": {
84 "plaintext": "Foo"
85 }
86 },
87 "isOriginalContent": true,
88 "isModerated": false,
89 "links": {
90 "topic-history": {
91 "url": "/w/index.php?title=Topic:Ry51fussyfpos7k9&action=history",
92 "title": "History"
93 },
94 "topic": {
95 "url": "/wiki/Topic:Ry51fussyfpos7k9",
96 "title": "topic"
97 },
98 "post": {
99 "url": "/w/index.php?title=Topic:Ry51fussyfpos7k9&topic_showPostId=ry51fussyfpos7k9#flow-post-ry51fussyfpos7k9",
100 "title": "post"
101 },
102 "topic-revision": {
103 "url": "/w/index.php?title=Topic:Ry51fussyfpos7k9&topic_revId=ry51fusuik5c4ea1&action=single-view",
104 "title": "topic revision"
105 },
106 "watch-topic": {
107 "url": "/w/index.php?title=Topic:Ry51fussyfpos7k9&action=watch",
108 "title": "Watch"
109 },
110 "unwatch-topic": {
111 "url": "/w/index.php?title=Topic:Ry51fussyfpos7k9&action=unwatch",
112 "title": "Unwatch"
113 }
114 },
115 "actions": {
116 "reply": {
117 "url": "/w/index.php?title=Topic:Ry51fussyfpos7k9&action=reply&topic_postId=ry51fussyfpos7k9#flow-reply-ry51fussyfpos7k9",
118 "title": "Reply"
119 },
120 "edit": {
121 "url": "/w/index.php?title=Topic:Ry51fussyfpos7k9&action=edit-title&topic_revId=ry51fusuik5c4ea1",
122 "title": "Edit title"
123 },
124 "hide": {
125 "url": "/w/index.php?title=Topic:Ry51fussyfpos7k9&action=moderate-topic&topic_moderationState=hide",
126 "title": "Hide topic"
127 },
128 "summarize": {
129 "url": "/w/index.php?title=Topic:Ry51fussyfpos7k9&action=edit-topic-summary",
130 "title": "Summarize"
131 }
132 },
133 "size": {
134 "old": 0,
135 "new": 3
136 },
137 "author": {
138 "name": "198.73.209.5",
139 "wiki": "mediawikiwiki",
140 "gender": "unknown",
141 "links": {
142 "contribs": {
143 "url": "/wiki/Special:Contributions/198.73.209.5",
144 "title": "Contributions/198.73.209.5",
145 "exists": true
146 },
147 "userpage": {
148 "url": "/wiki/User:198.73.209.5",
149 "title": "198.73.209.5",
150 "exists": false
151 },
152 "talk": {
153 "url": "/wiki/User_talk:198.73.209.5",
154 "title": "User talk:198.73.209.5",
155 "exists": false
156 }
157 },
158 "id": 0
159 },
160 "lastEditUser": {
161 "name": null,
162 "wiki": null,
163 "gender": "unknown",
164 "links": [],
165 "id": null
166 },
167 "lastEditId": null,
168 "previousRevisionId": null,
169 "content": {
170 "content": "Foo",
171 "format": "plaintext"
172 },
173 "watchable": false,
174 "replyToId": null,
175 "postId": "ry51fussyfpos7k9",
176 "isMaxThreadingDepth": false,
177 "creator": {
178 "name": "198.73.209.5",
179 "wiki": "mediawikiwiki",
180 "gender": "unknown",
181 "links": {
182 "contribs": {
183 "url": "/wiki/Special:Contributions/198.73.209.5",
184 "title": "Contributions/198.73.209.5",
185 "exists": true
186 },
187 "userpage": {
188 "url": "/wiki/User:198.73.209.5",
189 "title": "198.73.209.5",
190 "exists": false
191 },
192 "talk": {
193 "url": "/wiki/User_talk:198.73.209.5",
194 "title": "User talk:198.73.209.5",
195 "exists": false
196 }
197 },
198 "id": 0
199 },
200 "replies": [
201 "ry51fusw2okzgkzt"
202 ],
203 "reply_count": 1,
204 "last_updated_readable": "23:23, 8 July 2014",
205 "last_updated": 1404861814000
206 },
207 "ry51fusw2okzgkzt": {
208 "workflowId": "ry51fussyfpos7k9",
209 "revisionId": "ry51fusw2okzgkzt",
210 "timestamp": "20140708232334",
211 "changeType": "reply",
212 "dateFormats": [],
213 "properties": [],
214 "isOriginalContent": true,
215 "isModerated": false,
216 "links": {
217 "topic-history": {
218 "url": "/w/index.php?title=Topic:Ry51fussyfpos7k9&action=history",
219 "title": "History"
220 },
221 "topic": {
222 "url": "/wiki/Topic:Ry51fussyfpos7k9",
223 "title": "topic"
224 },
225 "post": {
226 "url": "/w/index.php?title=Topic:Ry51fussyfpos7k9&topic_showPostId=ry51fusw2okzgkzt#flow-post-ry51fusw2okzgkzt",
227 "title": "post"
228 },
229 "post-revision": {
230 "url": "/w/index.php?title=Topic:Ry51fussyfpos7k9&topic_postId=ry51fusw2okzgkzt&topic_revId=ry51fusw2okzgkzt&action=single-view",
231 "title": "post revision"
232 },
233 "watch-topic": {
234 "url": "/w/index.php?title=Topic:Ry51fussyfpos7k9&action=watch",
235 "title": "Watch"
236 },
237 "unwatch-topic": {
238 "url": "/w/index.php?title=Topic:Ry51fussyfpos7k9&action=unwatch",
239 "title": "Unwatch"
240 }
241 },
242 "actions": {
243 "reply": {
244 "url": "/w/index.php?title=Topic:Ry51fussyfpos7k9&action=reply&topic_postId=ry51fusw2okzgkzt#flow-post-ry51fusw2okzgkzt",
245 "title": "Reply"
246 },
247 "hide": {
248 "url": "/w/index.php?title=Topic:Ry51fussyfpos7k9&action=moderate-post&topic_postId=ry51fusw2okzgkzt&topic_moderationState=hide",
249 "title": "Hide"
250 },
251 "summarize": {
252 "url": "/w/index.php?title=Topic:Ry51fussyfpos7k9&action=edit-topic-summary",
253 "title": "Summarize"
254 }
255 },
256 "size": {
257 "old": 0,
258 "new": 43
259 },
260 "author": {
261 "name": "198.73.209.5",
262 "wiki": "mediawikiwiki",
263 "gender": "unknown",
264 "links": {
265 "contribs": {
266 "url": "/wiki/Special:Contributions/198.73.209.5",
267 "title": "Contributions/198.73.209.5",
268 "exists": true
269 },
270 "userpage": {
271 "url": "/wiki/User:198.73.209.5",
272 "title": "198.73.209.5",
273 "exists": false
274 },
275 "talk": {
276 "url": "/wiki/User_talk:198.73.209.5",
277 "title": "User talk:198.73.209.5",
278 "exists": false
279 }
280 },
281 "id": 0
282 },
283 "lastEditUser": {
284 "name": null,
285 "wiki": null,
286 "gender": "unknown",
287 "links": [],
288 "id": null
289 },
290 "lastEditId": null,
291 "previousRevisionId": null,
292 "content": {
293 "content": "<p data-parsoid='{\"dsr\":[0,3,0,0]}'>bar</p>",
294 "format": "html"
295 },
296 "watchable": false,
297 "replyToId": "ry51fussyfpos7k9",
298 "postId": "ry51fusw2okzgkzt",
299 "isMaxThreadingDepth": false,
300 "creator": {
301 "name": "198.73.209.5",
302 "wiki": "mediawikiwiki",
303 "gender": "unknown",
304 "links": {
305 "contribs": {
306 "url": "/wiki/Special:Contributions/198.73.209.5",
307 "title": "Contributions/198.73.209.5",
308 "exists": true
309 },
310 "userpage": {
311 "url": "/wiki/User:198.73.209.5",
312 "title": "198.73.209.5",
313 "exists": false
314 },
315 "talk": {
316 "url": "/wiki/User_talk:198.73.209.5",
317 "title": "User talk:198.73.209.5",
318 "exists": false
319 }
320 },
321 "id": 0
322 },
323 "replies": []
324 },
325 "ry4n6b5ea2mlluu9": {
326 "workflowId": "ry4n6b5cpy6y9o4h",
327 "revisionId": "ry4n6b5ea2mlluu9",
328 "timestamp": "20140708190725",
329 "changeType": "new-post",
330 "dateFormats": [],
331 "properties": {
332 "topic-of-post": {
333 "plaintext": "Manually add"
334 }
335 },
336 "isOriginalContent": true,
337 "isModerated": false,
338 "links": {
339 "topic-history": {
340 "url": "/w/index.php?title=Topic:Ry4n6b5cpy6y9o4h&action=history",
341 "title": "History"
342 },
343 "topic": {
344 "url": "/wiki/Topic:Ry4n6b5cpy6y9o4h",
345 "title": "topic"
346 },
347 "post": {
348 "url": "/w/index.php?title=Topic:Ry4n6b5cpy6y9o4h&topic_showPostId=ry4n6b5cpy6y9o4h#flow-post-ry4n6b5cpy6y9o4h",
349 "title": "post"
350 },
351 "topic-revision": {
352 "url": "/w/index.php?title=Topic:Ry4n6b5cpy6y9o4h&topic_revId=ry4n6b5ea2mlluu9&action=single-view",
353 "title": "topic revision"
354 },
355 "watch-topic": {
356 "url": "/w/index.php?title=Topic:Ry4n6b5cpy6y9o4h&action=watch",
357 "title": "Watch"
358 },
359 "unwatch-topic": {
360 "url": "/w/index.php?title=Topic:Ry4n6b5cpy6y9o4h&action=unwatch",
361 "title": "Unwatch"
362 }
363 },
364 "actions": {
365 "reply": {
366 "url": "/w/index.php?title=Topic:Ry4n6b5cpy6y9o4h&action=reply&topic_postId=ry4n6b5cpy6y9o4h#flow-reply-ry4n6b5cpy6y9o4h",
367 "title": "Reply"
368 },
369 "edit": {
370 "url": "/w/index.php?title=Topic:Ry4n6b5cpy6y9o4h&action=edit-title&topic_revId=ry4n6b5ea2mlluu9",
371 "title": "Edit title"
372 },
373 "hide": {
374 "url": "/w/index.php?title=Topic:Ry4n6b5cpy6y9o4h&action=moderate-topic&topic_moderationState=hide",
375 "title": "Hide topic"
376 },
377 "summarize": {
378 "url": "/w/index.php?title=Topic:Ry4n6b5cpy6y9o4h&action=edit-topic-summary",
379 "title": "Summarize"
380 }
381 },
382 "size": {
383 "old": 0,
384 "new": 12
385 },
386 "author": {
387 "name": "198.73.209.1",
388 "wiki": "mediawikiwiki",
389 "gender": "unknown",
390 "links": {
391 "contribs": {
392 "url": "/wiki/Special:Contributions/198.73.209.1",
393 "title": "Contributions/198.73.209.1",
394 "exists": true
395 },
396 "userpage": {
397 "url": "/wiki/User:198.73.209.1",
398 "title": "198.73.209.1",
399 "exists": false
400 },
401 "talk": {
402 "url": "/wiki/User_talk:198.73.209.1",
403 "title": "User talk:198.73.209.1",
404 "exists": false
405 }
406 },
407 "id": 0
408 },
409 "lastEditUser": {
410 "name": null,
411 "wiki": null,
412 "gender": "unknown",
413 "links": [],
414 "id": null
415 },
416 "lastEditId": null,
417 "previousRevisionId": null,
418 "content": {
419 "content": "Manually add",
420 "format": "plaintext"
421 },
422 "watchable": false,
423 "replyToId": null,
424 "postId": "ry4n6b5cpy6y9o4h",
425 "isMaxThreadingDepth": false,
426 "creator": {
427 "name": "198.73.209.1",
428 "wiki": "mediawikiwiki",
429 "gender": "unknown",
430 "links": {
431 "contribs": {
432 "url": "/wiki/Special:Contributions/198.73.209.1",
433 "title": "Contributions/198.73.209.1",
434 "exists": true
435 },
436 "userpage": {
437 "url": "/wiki/User:198.73.209.1",
438 "title": "198.73.209.1",
439 "exists": false
440 },
441 "talk": {
442 "url": "/wiki/User_talk:198.73.209.1",
443 "title": "User talk:198.73.209.1",
444 "exists": false
445 }
446 },
447 "id": 0
448 },
449 "replies": [
450 "ry4n6b5fu728y1k1"
451 ],
452 "reply_count": 1,
453 "last_updated_readable": "19:07, 8 July 2014",
454 "last_updated": 1404846445000
455 },
456 "ry4n6b5fu728y1k1": {
457 "workflowId": "ry4n6b5cpy6y9o4h",
458 "revisionId": "ry4n6b5fu728y1k1",
459 "timestamp": "20140708190725",
460 "changeType": "reply",
461 "dateFormats": [],
462 "properties": [],
463 "isOriginalContent": true,
464 "isModerated": false,
465 "links": {
466 "topic-history": {
467 "url": "/w/index.php?title=Topic:Ry4n6b5cpy6y9o4h&action=history",
468 "title": "History"
469 },
470 "topic": {
471 "url": "/wiki/Topic:Ry4n6b5cpy6y9o4h",
472 "title": "topic"
473 },
474 "post": {
475 "url": "/w/index.php?title=Topic:Ry4n6b5cpy6y9o4h&topic_showPostId=ry4n6b5fu728y1k1#flow-post-ry4n6b5fu728y1k1",
476 "title": "post"
477 },
478 "post-revision": {
479 "url": "/w/index.php?title=Topic:Ry4n6b5cpy6y9o4h&topic_postId=ry4n6b5fu728y1k1&topic_revId=ry4n6b5fu728y1k1&action=single-view",
480 "title": "post revision"
481 },
482 "watch-topic": {
483 "url": "/w/index.php?title=Topic:Ry4n6b5cpy6y9o4h&action=watch",
484 "title": "Watch"
485 },
486 "unwatch-topic": {
487 "url": "/w/index.php?title=Topic:Ry4n6b5cpy6y9o4h&action=unwatch",
488 "title": "Unwatch"
489 }
490 },
491 "actions": {
492 "reply": {
493 "url": "/w/index.php?title=Topic:Ry4n6b5cpy6y9o4h&action=reply&topic_postId=ry4n6b5fu728y1k1#flow-post-ry4n6b5fu728y1k1",
494 "title": "Reply"
495 },
496 "hide": {
497 "url": "/w/index.php?title=Topic:Ry4n6b5cpy6y9o4h&action=moderate-post&topic_postId=ry4n6b5fu728y1k1&topic_moderationState=hide",
498 "title": "Hide"
499 },
500 "summarize": {
501 "url": "/w/index.php?title=Topic:Ry4n6b5cpy6y9o4h&action=edit-topic-summary",
502 "title": "Summarize"
503 }
504 },
505 "size": {
506 "old": 0,
507 "new": 48
508 },
509 "author": {
510 "name": "198.73.209.1",
511 "wiki": "mediawikiwiki",
512 "gender": "unknown",
513 "links": {
514 "contribs": {
515 "url": "/wiki/Special:Contributions/198.73.209.1",
516 "title": "Contributions/198.73.209.1",
517 "exists": true
518 },
519 "userpage": {
520 "url": "/wiki/User:198.73.209.1",
521 "title": "198.73.209.1",
522 "exists": false
523 },
524 "talk": {
525 "url": "/wiki/User_talk:198.73.209.1",
526 "title": "User talk:198.73.209.1",
527 "exists": false
528 }
529 },
530 "id": 0
531 },
532 "lastEditUser": {
533 "name": null,
534 "wiki": null,
535 "gender": "unknown",
536 "links": [],
537 "id": null
538 },
539 "lastEditId": null,
540 "previousRevisionId": null,
541 "content": {
542 "content": "<p data-parsoid='{\"dsr\":[0,8,0,0]}'>And more</p>",
543 "format": "html"
544 },
545 "watchable": false,
546 "replyToId": "ry4n6b5cpy6y9o4h",
547 "postId": "ry4n6b5fu728y1k1",
548 "isMaxThreadingDepth": false,
549 "creator": {
550 "name": "198.73.209.1",
551 "wiki": "mediawikiwiki",
552 "gender": "unknown",
553 "links": {
554 "contribs": {
555 "url": "/wiki/Special:Contributions/198.73.209.1",
556 "title": "Contributions/198.73.209.1",
557 "exists": true
558 },
559 "userpage": {
560 "url": "/wiki/User:198.73.209.1",
561 "title": "198.73.209.1",
562 "exists": false
563 },
564 "talk": {
565 "url": "/wiki/User_talk:198.73.209.1",
566 "title": "User talk:198.73.209.1",
567 "exists": false
568 }
569 },
570 "id": 0
571 },
572 "replies": []
573 },
574 "rs9l9vavo9gfeulj": {
575 "workflowId": "rs9l9vau450s2nvr",
576 "revisionId": "rs9l9vavo9gfeulj",
577 "timestamp": "20140405011634",
578 "changeType": "new-post",
579 "dateFormats": [],
580 "properties": {
581 "topic-of-post": {
582 "plaintext": "test"
583 }
584 },
585 "isOriginalContent": true,
586 "isModerated": false,
587 "links": {
588 "topic-history": {
589 "url": "/w/index.php?title=Topic:Rs9l9vau450s2nvr&action=history",
590 "title": "History"
591 },
592 "topic": {
593 "url": "/wiki/Topic:Rs9l9vau450s2nvr",
594 "title": "topic"
595 },
596 "post": {
597 "url": "/w/index.php?title=Topic:Rs9l9vau450s2nvr&topic_showPostId=rs9l9vau450s2nvr#flow-post-rs9l9vau450s2nvr",
598 "title": "post"
599 },
600 "topic-revision": {
601 "url": "/w/index.php?title=Topic:Rs9l9vau450s2nvr&topic_revId=rs9l9vavo9gfeulj&action=single-view",
602 "title": "topic revision"
603 },
604 "watch-topic": {
605 "url": "/w/index.php?title=Topic:Rs9l9vau450s2nvr&action=watch",
606 "title": "Watch"
607 },
608 "unwatch-topic": {
609 "url": "/w/index.php?title=Topic:Rs9l9vau450s2nvr&action=unwatch",
610 "title": "Unwatch"
611 }
612 },
613 "actions": {
614 "reply": {
615 "url": "/w/index.php?title=Topic:Rs9l9vau450s2nvr&action=reply&topic_postId=rs9l9vau450s2nvr#flow-reply-rs9l9vau450s2nvr",
616 "title": "Reply"
617 },
618 "edit": {
619 "url": "/w/index.php?title=Topic:Rs9l9vau450s2nvr&action=edit-title&topic_revId=rs9l9vavo9gfeulj",
620 "title": "Edit title"
621 },
622 "hide": {
623 "url": "/w/index.php?title=Topic:Rs9l9vau450s2nvr&action=moderate-topic&topic_moderationState=hide",
624 "title": "Hide topic"
625 },
626 "summarize": {
627 "url": "/w/index.php?title=Topic:Rs9l9vau450s2nvr&action=edit-topic-summary",
628 "title": "Summarize"
629 }
630 },
631 "size": {
632 "old": 0,
633 "new": 4
634 },
635 "author": {
636 "name": "Bsitu",
637 "wiki": "mediawikiwiki",
638 "gender": "unknown",
639 "links": {
640 "contribs": {
641 "url": "/wiki/Special:Contributions/Bsitu",
642 "title": "Contributions/Bsitu",
643 "exists": true
644 },
645 "userpage": {
646 "url": "/wiki/User:Bsitu",
647 "title": "Bsitu",
648 "exists": true
649 },
650 "talk": {
651 "url": "/wiki/User_talk:Bsitu",
652 "title": "User talk:Bsitu",
653 "exists": true
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1330 "timestamp": "20140814202729",
1331 "changeType": "new-post",
1332 "dateFormats": [],
1333 "properties": {
1334 "topic-of-post": {
1335 "plaintext": "Test new topic"
1336 }
1337 },
1338 "isOriginalContent": true,
1339 "isModerated": false,
1340 "links": {
1341 "topic-history": {
1342 "url": "/w/index.php?title=Topic:S0f6tno1s2qnzx47&action=history",
1343 "title": "History"
1344 },
1345 "topic": {
1346 "url": "/wiki/Topic:S0f6tno1s2qnzx47",
1347 "title": "topic"
1348 },
1349 "post": {
1350 "url": "/w/index.php?title=Topic:S0f6tno1s2qnzx47&topic_showPostId=s0f6tno1s2qnzx47#flow-post-s0f6tno1s2qnzx47",
1351 "title": "post"
1352 },
1353 "topic-revision": {
1354 "url": "/w/index.php?title=Topic:S0f6tno1s2qnzx47&topic_revId=s0f6tno6gg1m0h9j&action=single-view",
1355 "title": "topic revision"
1356 },
1357 "watch-topic": {
1358 "url": "/w/index.php?title=Topic:S0f6tno1s2qnzx47&action=watch",
1359 "title": "Watch"
1360 },
1361 "unwatch-topic": {
1362 "url": "/w/index.php?title=Topic:S0f6tno1s2qnzx47&action=unwatch",
1363 "title": "Unwatch"
1364 }
1365 },
1366 "actions": {
1367 "reply": {
1368 "url": "/w/index.php?title=Topic:S0f6tno1s2qnzx47&action=reply&topic_postId=s0f6tno1s2qnzx47#flow-reply-s0f6tno1s2qnzx47",
1369 "title": "Reply"
1370 },
1371 "edit": {
1372 "url": "/w/index.php?title=Topic:S0f6tno1s2qnzx47&action=edit-title&topic_revId=s0f6tno6gg1m0h9j",
1373 "title": "Edit title"
1374 },
1375 "hide": {
1376 "url": "/w/index.php?title=Topic:S0f6tno1s2qnzx47&action=moderate-topic&topic_moderationState=hide",
1377 "title": "Hide topic"
1378 },
1379 "summarize": {
1380 "url": "/w/index.php?title=Topic:S0f6tno1s2qnzx47&action=edit-topic-summary",
1381 "title": "Summarize"
1382 }
1383 },
1384 "size": {
1385 "old": 0,
1386 "new": 14
1387 },
1388 "author": {
1389 "name": "SPage (WMF)",
1390 "wiki": "mediawikiwiki",
1391 "gender": "unknown",
1392 "links": {
1393 "contribs": {
1394 "url": "/wiki/Special:Contributions/SPage_(WMF)",
1395 "title": "Contributions/SPage (WMF)",
1396 "exists": true
1397 },
1398 "userpage": {
1399 "url": "/wiki/User:SPage_(WMF)",
1400 "title": "SPage (WMF)",
1401 "exists": true
1402 },
1403 "talk": {
1404 "url": "/wiki/User_talk:SPage_(WMF)",
1405 "title": "User talk:SPage (WMF)",
1406 "exists": true
1407 }
1408 },
1409 "id": 619583
1410 },
1411 "lastEditUser": {
1412 "name": null,
1413 "wiki": null,
1414 "gender": "unknown",
1415 "links": [],
1416 "id": null
1417 },
1418 "lastEditId": null,
1419 "previousRevisionId": null,
1420 "content": {
1421 "content": "Test new topic",
1422 "format": "plaintext"
1423 },
1424 "watchable": false,
1425 "replyToId": null,
1426 "postId": "s0f6tno1s2qnzx47",
1427 "isMaxThreadingDepth": false,
1428 "creator": {
1429 "name": "SPage (WMF)",
1430 "wiki": "mediawikiwiki",
1431 "gender": "unknown",
1432 "links": {
1433 "contribs": {
1434 "url": "/wiki/Special:Contributions/SPage_(WMF)",
1435 "title": "Contributions/SPage (WMF)",
1436 "exists": true
1437 },
1438 "userpage": {
1439 "url": "/wiki/User:SPage_(WMF)",
1440 "title": "SPage (WMF)",
1441 "exists": true
1442 },
1443 "talk": {
1444 "url": "/wiki/User_talk:SPage_(WMF)",
1445 "title": "User talk:SPage (WMF)",
1446 "exists": true
1447 }
1448 },
1449 "id": 619583
1450 },
1451 "replies": [
1452 "s0f6tno6gi0n4j8n"
1453 ],
1454 "reply_count": 1,
1455 "last_updated_readable": "20:27, 14 August 2014",
1456 "last_updated": 1408048049000
1457 },
1458 "s0f6tno6gi0n4j8n": {
1459 "workflowId": "s0f6tno1s2qnzx47",
1460 "revisionId": "s0f6tno6gi0n4j8n",
1461 "timestamp": "20140814202729",
1462 "changeType": "reply",
1463 "dateFormats": [],
1464 "properties": [],
1465 "isOriginalContent": true,
1466 "isModerated": false,
1467 "links": {
1468 "topic-history": {
1469 "url": "/w/index.php?title=Topic:S0f6tno1s2qnzx47&action=history",
1470 "title": "History"
1471 },
1472 "topic": {
1473 "url": "/wiki/Topic:S0f6tno1s2qnzx47",
1474 "title": "topic"
1475 },
1476 "post": {
1477 "url": "/w/index.php?title=Topic:S0f6tno1s2qnzx47&topic_showPostId=s0f6tno6gi0n4j8n#flow-post-s0f6tno6gi0n4j8n",
1478 "title": "post"
1479 },
1480 "post-revision": {
1481 "url": "/w/index.php?title=Topic:S0f6tno1s2qnzx47&topic_postId=s0f6tno6gi0n4j8n&topic_revId=s0f6tno6gi0n4j8n&action=single-view",
1482 "title": "post revision"
1483 },
1484 "watch-topic": {
1485 "url": "/w/index.php?title=Topic:S0f6tno1s2qnzx47&action=watch",
1486 "title": "Watch"
1487 },
1488 "unwatch-topic": {
1489 "url": "/w/index.php?title=Topic:S0f6tno1s2qnzx47&action=unwatch",
1490 "title": "Unwatch"
1491 }
1492 },
1493 "actions": {
1494 "reply": {
1495 "url": "/w/index.php?title=Topic:S0f6tno1s2qnzx47&action=reply&topic_postId=s0f6tno6gi0n4j8n#flow-post-s0f6tno6gi0n4j8n",
1496 "title": "Reply"
1497 },
1498 "hide": {
1499 "url": "/w/index.php?title=Topic:S0f6tno1s2qnzx47&action=moderate-post&topic_postId=s0f6tno6gi0n4j8n&topic_moderationState=hide",
1500 "title": "Hide"
1501 },
1502 "summarize": {
1503 "url": "/w/index.php?title=Topic:S0f6tno1s2qnzx47&action=edit-topic-summary",
1504 "title": "Summarize"
1505 }
1506 },
1507 "size": {
1508 "old": 0,
1509 "new": 57
1510 },
1511 "author": {
1512 "name": "SPage (WMF)",
1513 "wiki": "mediawikiwiki",
1514 "gender": "unknown",
1515 "links": {
1516 "contribs": {
1517 "url": "/wiki/Special:Contributions/SPage_(WMF)",
1518 "title": "Contributions/SPage (WMF)",
1519 "exists": true
1520 },
1521 "userpage": {
1522 "url": "/wiki/User:SPage_(WMF)",
1523 "title": "SPage (WMF)",
1524 "exists": true
1525 },
1526 "talk": {
1527 "url": "/wiki/User_talk:SPage_(WMF)",
1528 "title": "User talk:SPage (WMF)",
1529 "exists": true
1530 }
1531 },
1532 "id": 619583
1533 },
1534 "lastEditUser": {
1535 "name": null,
1536 "wiki": null,
1537 "gender": "unknown",
1538 "links": [],
1539 "id": null
1540 },
1541 "lastEditId": null,
1542 "previousRevisionId": null,
1543 "content": {
1544 "content": "<p data-parsoid='{\"dsr\":[0,16,0,0]}'>And a first post</p>",
1545 "format": "html"
1546 },
1547 "watchable": false,
1548 "replyToId": "s0f6tno1s2qnzx47",
1549 "postId": "s0f6tno6gi0n4j8n",
1550 "isMaxThreadingDepth": false,
1551 "creator": {
1552 "name": "SPage (WMF)",
1553 "wiki": "mediawikiwiki",
1554 "gender": "unknown",
1555 "links": {
1556 "contribs": {
1557 "url": "/wiki/Special:Contributions/SPage_(WMF)",
1558 "title": "Contributions/SPage (WMF)",
1559 "exists": true
1560 },
1561 "userpage": {
1562 "url": "/wiki/User:SPage_(WMF)",
1563 "title": "SPage (WMF)",
1564 "exists": true
1565 },
1566 "talk": {
1567 "url": "/wiki/User_talk:SPage_(WMF)",
1568 "title": "User talk:SPage (WMF)",
1569 "exists": true
1570 }
1571 },
1572 "id": 619583
1573 },
1574 "replies": []
1575 },
1576 "ry62pq3wca9m47h2": {
1577 "workflowId": "ry62pq3us5tys0ra",
1578 "revisionId": "ry62pq3wca9m47h2",
1579 "timestamp": "20140709103253",
1580 "changeType": "new-post",
1581 "dateFormats": [],
1582 "properties": {
1583 "topic-of-post": {
1584 "plaintext": "Siberian Tiger"
1585 }
1586 },
1587 "isOriginalContent": true,
1588 "isModerated": false,
1589 "links": {
1590 "topic-history": {
1591 "url": "/w/index.php?title=Topic:Ry62pq3us5tys0ra&action=history",
1592 "title": "History"
1593 },
1594 "topic": {
1595 "url": "/wiki/Topic:Ry62pq3us5tys0ra",
1596 "title": "topic"
1597 },
1598 "post": {
1599 "url": "/w/index.php?title=Topic:Ry62pq3us5tys0ra&topic_showPostId=ry62pq3us5tys0ra#flow-post-ry62pq3us5tys0ra",
1600 "title": "post"
1601 },
1602 "topic-revision": {
1603 "url": "/w/index.php?title=Topic:Ry62pq3us5tys0ra&topic_revId=ry62pq3wca9m47h2&action=single-view",
1604 "title": "topic revision"
1605 },
1606 "watch-topic": {
1607 "url": "/w/index.php?title=Topic:Ry62pq3us5tys0ra&action=watch",
1608 "title": "Watch"
1609 },
1610 "unwatch-topic": {
1611 "url": "/w/index.php?title=Topic:Ry62pq3us5tys0ra&action=unwatch",
1612 "title": "Unwatch"
1613 }
1614 },
1615 "actions": {
1616 "reply": {
1617 "url": "/w/index.php?title=Topic:Ry62pq3us5tys0ra&action=reply&topic_postId=ry62pq3us5tys0ra#flow-reply-ry62pq3us5tys0ra",
1618 "title": "Reply"
1619 },
1620 "edit": {
1621 "url": "/w/index.php?title=Topic:Ry62pq3us5tys0ra&action=edit-title&topic_revId=ry62pq3wca9m47h2",
1622 "title": "Edit title"
1623 },
1624 "hide": {
1625 "url": "/w/index.php?title=Topic:Ry62pq3us5tys0ra&action=moderate-topic&topic_moderationState=hide",
1626 "title": "Hide topic"
1627 },
1628 "summarize": {
1629 "url": "/w/index.php?title=Topic:Ry62pq3us5tys0ra&action=edit-topic-summary",
1630 "title": "Summarize"
1631 }
1632 },
1633 "size": {
1634 "old": 0,
1635 "new": 14
1636 },
1637 "author": {
1638 "name": "DannyH (WMF)",
1639 "wiki": "mediawikiwiki",
1640 "gender": "male",
1641 "links": {
1642 "contribs": {
1643 "url": "/wiki/Special:Contributions/DannyH_(WMF)",
1644 "title": "Contributions/DannyH (WMF)",
1645 "exists": true
1646 },
1647 "userpage": {
1648 "url": "/wiki/User:DannyH_(WMF)",
1649 "title": "DannyH (WMF)",
1650 "exists": true
1651 },
1652 "talk": {
1653 "url": "/wiki/User_talk:DannyH_(WMF)",
1654 "title": "User talk:DannyH (WMF)",
1655 "exists": true
1656 }
1657 },
1658 "id": 1480243
1659 },
1660 "lastEditUser": {
1661 "name": null,
1662 "wiki": null,
1663 "gender": "unknown",
1664 "links": [],
1665 "id": null
1666 },
1667 "lastEditId": null,
1668 "previousRevisionId": null,
1669 "content": {
1670 "content": "Siberian Tiger",
1671 "format": "plaintext"
1672 },
1673 "watchable": false,
1674 "replyToId": null,
1675 "postId": "ry62pq3us5tys0ra",
1676 "isMaxThreadingDepth": false,
1677 "creator": {
1678 "name": "DannyH (WMF)",
1679 "wiki": "mediawikiwiki",
1680 "gender": "male",
1681 "links": {
1682 "contribs": {
1683 "url": "/wiki/Special:Contributions/DannyH_(WMF)",
1684 "title": "Contributions/DannyH (WMF)",
1685 "exists": true
1686 },
1687 "userpage": {
1688 "url": "/wiki/User:DannyH_(WMF)",
1689 "title": "DannyH (WMF)",
1690 "exists": true
1691 },
1692 "talk": {
1693 "url": "/wiki/User_talk:DannyH_(WMF)",
1694 "title": "User talk:DannyH (WMF)",
1695 "exists": true
1696 }
1697 },
1698 "id": 1480243
1699 },
1700 "replies": [
1701 "ry62pq3zgj4wskwm"
1702 ],
1703 "reply_count": 1,
1704 "last_updated_readable": "10:32, 9 July 2014",
1705 "last_updated": 1404901973000
1706 },
1707 "ry62pq3zgj4wskwm": {
1708 "workflowId": "ry62pq3us5tys0ra",
1709 "revisionId": "ry62pq3zgj4wskwm",
1710 "timestamp": "20140709103253",
1711 "changeType": "reply",
1712 "dateFormats": [],
1713 "properties": [],
1714 "isOriginalContent": true,
1715 "isModerated": false,
1716 "links": {
1717 "topic-history": {
1718 "url": "/w/index.php?title=Topic:Ry62pq3us5tys0ra&action=history",
1719 "title": "History"
1720 },
1721 "topic": {
1722 "url": "/wiki/Topic:Ry62pq3us5tys0ra",
1723 "title": "topic"
1724 },
1725 "post": {
1726 "url": "/w/index.php?title=Topic:Ry62pq3us5tys0ra&topic_showPostId=ry62pq3zgj4wskwm#flow-post-ry62pq3zgj4wskwm",
1727 "title": "post"
1728 },
1729 "post-revision": {
1730 "url": "/w/index.php?title=Topic:Ry62pq3us5tys0ra&topic_postId=ry62pq3zgj4wskwm&topic_revId=ry62pq3zgj4wskwm&action=single-view",
1731 "title": "post revision"
1732 },
1733 "watch-topic": {
1734 "url": "/w/index.php?title=Topic:Ry62pq3us5tys0ra&action=watch",
1735 "title": "Watch"
1736 },
1737 "unwatch-topic": {
1738 "url": "/w/index.php?title=Topic:Ry62pq3us5tys0ra&action=unwatch",
1739 "title": "Unwatch"
1740 }
1741 },
1742 "actions": {
1743 "reply": {
1744 "url": "/w/index.php?title=Topic:Ry62pq3us5tys0ra&action=reply&topic_postId=ry62pq3zgj4wskwm#flow-post-ry62pq3zgj4wskwm",
1745 "title": "Reply"
1746 },
1747 "hide": {
1748 "url": "/w/index.php?title=Topic:Ry62pq3us5tys0ra&action=moderate-post&topic_postId=ry62pq3zgj4wskwm&topic_moderationState=hide",
1749 "title": "Hide"
1750 },
1751 "summarize": {
1752 "url": "/w/index.php?title=Topic:Ry62pq3us5tys0ra&action=edit-topic-summary",
1753 "title": "Summarize"
1754 }
1755 },
1756 "size": {
1757 "old": 0,
1758 "new": 418
1759 },
1760 "author": {
1761 "name": "DannyH (WMF)",
1762 "wiki": "mediawikiwiki",
1763 "gender": "male",
1764 "links": {
1765 "contribs": {
1766 "url": "/wiki/Special:Contributions/DannyH_(WMF)",
1767 "title": "Contributions/DannyH (WMF)",
1768 "exists": true
1769 },
1770 "userpage": {
1771 "url": "/wiki/User:DannyH_(WMF)",
1772 "title": "DannyH (WMF)",
1773 "exists": true
1774 },
1775 "talk": {
1776 "url": "/wiki/User_talk:DannyH_(WMF)",
1777 "title": "User talk:DannyH (WMF)",
1778 "exists": true
1779 }
1780 },
1781 "id": 1480243
1782 },
1783 "lastEditUser": {
1784 "name": null,
1785 "wiki": null,
1786 "gender": "unknown",
1787 "links": [],
1788 "id": null
1789 },
1790 "lastEditId": null,
1791 "previousRevisionId": null,
1792 "content": {
1793 "content": "<p data-parsoid='{\"dsr\":[0,376,0,0]}'>I appreciate your contributions on our Siberian tiger article. However, your edits removed some properly sourced original content relevant to the article and your new edits also focus more on bears with greater details while omitting the details on tigers in the original version, which is not appropriate since undue weight given to bears and this constitutes biased content.</p>",
1794 "format": "html"
1795 },
1796 "watchable": false,
1797 "replyToId": "ry62pq3us5tys0ra",
1798 "postId": "ry62pq3zgj4wskwm",
1799 "isMaxThreadingDepth": false,
1800 "creator": {
1801 "name": "DannyH (WMF)",
1802 "wiki": "mediawikiwiki",
1803 "gender": "male",
1804 "links": {
1805 "contribs": {
1806 "url": "/wiki/Special:Contributions/DannyH_(WMF)",
1807 "title": "Contributions/DannyH (WMF)",
1808 "exists": true
1809 },
1810 "userpage": {
1811 "url": "/wiki/User:DannyH_(WMF)",
1812 "title": "DannyH (WMF)",
1813 "exists": true
1814 },
1815 "talk": {
1816 "url": "/wiki/User_talk:DannyH_(WMF)",
1817 "title": "User talk:DannyH (WMF)",
1818 "exists": true
1819 }
1820 },
1821 "id": 1480243
1822 },
1823 "replies": []
1824 }
1825 },
1826 "title": "Talk:Flow QA",
1827 "actions": {
1828 "newtopic": {
1829 "url": "/w/index.php?title=Talk:Flow_QA&action=new-topic",
1830 "title": "Start a new topic"
1831 }
1832 },
1833 "type": "topiclist",
1834 "links": {
1835 "pagination": {
1836 "rev": {
1837 "url": "/w/index.php?title=Talk:Flow_QA&topiclist_offset-dir=rev&topiclist_limit=10&topiclist_offset-id=ry51fussyfpos7k9",
1838 "title": "rev"
1839 },
1840 "fwd": {
1841 "url": "/w/index.php?title=Talk:Flow_QA&topiclist_offset-dir=fwd&topiclist_limit=10&topiclist_offset-id=rqgvx99tpd5njsdj",
1842 "title": "fwd"
1843 }
1844 },
1845 "board-sort": {
1846 "updated": "/w/index.php?title=Talk:Flow_QA&topiclist_sortby=updated&topiclist_savesortby=",
1847 "newest": "/w/index.php?title=Talk:Flow_QA&topiclist_sortby=newest&topiclist_savesortby="
1848 },
1849 "newtopic": "/w/index.php?title=Talk:Flow_QA&action=new-topic"
1850 }
1851 }
1852 },
1853 "status": "ok"
1854 }
1855 }
1856}

You can see that the following topics are duplicated in the roots array (the whole segment appears twice):

"ry51fussyfpos7k9",
"ry4n6b5cpy6y9o4h",
"rs9l9vau450s2nvr",
"rqgvx99tpd5njsdj"

Details

Related Changes in Gerrit:
SubjectRepoBranchLines +/-
Bug: Incorrectly handling reverse paginationmediawiki/extensions/Flowmaster+82 -10
Customize query in gerrit

Revisions and Commits

rEFLW extension-Flow
rEFLWb9f2209ddb33 Bug: Incorrectly handling reverse pagination
rMEXT MediaWiki Extensions
rMEXTc87a00d9f40c Updated mediawiki/extensions Project: mediawiki/extensions/Flow…

Related Objects

Event Timeline

• Mattflaschen-WMF created this task.Dec 4 2014, 6:26 AM
• Mattflaschen-WMF raised the priority of this task from to High.
• Mattflaschen-WMF updated the task description. (Show Details)
• Mattflaschen-WMF added projects: StructuredDiscussions, Collaboration-Team-Triage.
• Mattflaschen-WMF changed Security from none to None.
• Mattflaschen-WMF added a subscriber: EBernhardson.
• Mattflaschen-WMF subscribed.
EBernhardson added a comment.Dec 5 2014, 6:11 PM

I have a theory about why this happens, essentially TopKIndex::replaceInIndex() is doing:

if ( $value === false ) {
    return false;
}
$idx = array_search( $row, $value );
if ( $idx === false ) {
    return false;
}
unset( $value[$idx] );
return $value;

in a memcache CAS operation. The $row that we are searching for includes the sorting data, we could be a little smarter and look for a row with just matching primary key since the sort data could in theory have changed in various race conditions.

EBernhardson claimed this task.Dec 11 2014, 4:13 PM
EBernhardson moved this task from Untriaged to Sprint O (ends Jan 27) on the Collaboration-Team-Triage board.Dec 11 2014, 4:16 PM
EBernhardson moved this task from Sprint O (ends Jan 27) to In Development on the Collaboration-Team-Triage board.
gerritbot added a project: Patch-For-Review.Dec 11 2014, 10:40 PM

Change 179178 had a related patch set uploaded (by EBernhardson):
Bug: Incorrectly handling reverse pagination

https://gerrit.wikimedia.org/r/179178

Patch-For-Review

EBernhardson moved this task from In Development to Code Review on the Collaboration-Team-Triage board.Dec 11 2014, 10:40 PM
gerritbot added a comment.Dec 12 2014, 10:53 PM

Change 179178 merged by jenkins-bot:
Bug: Incorrectly handling reverse pagination

https://gerrit.wikimedia.org/r/179178

EBernhardson closed this task as Resolved.Dec 12 2014, 10:53 PM
EBernhardson added a commit: rEFLWb9f2209ddb33: Bug: Incorrectly handling reverse pagination.

Closed by commit rEFLWb9f2209ddb33.

Quiddity moved this task from Code Review to Done (see also Status=Resolved) on the Collaboration-Team-Triage board.Dec 15 2014, 6:56 PM
Diffusion added a commit: rMEXTc87a00d9f40c: Updated mediawiki/extensions Project: mediawiki/extensions/Flow….Mar 11 2015, 4:37 AM
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