<p>This has a similar effect to <a href="https://github.com/openstreetmap/osm2pgsql/issues/722" class="issue-link js-issue-link" data-url="https://github.com/openstreetmap/osm2pgsql/issues/722" data-id="216352917" data-error-text="Failed to load issue title" data-permission-text="Issue title is private">#722</a> but completely different causes</p>
<p>==Background==<br>
When updating a planet database with diffs I was observing some ways disappearing from the output table, and isolated a case of it with way 127018391 in diff 2391120.</p>
<p>My update script does <code>osmosis --read-replication-interval --write-xml-change file="-" | osmium merge-changes --simplify -F osc --fsync -o "${file}"</code> and I pulled the file, changes-2391119.osc.gz. This diff reproduced the problem, but manually reproducing the changes to the way from that file didn't.</p>
<p>The following XML reproduces the problem when processed with <code>osm2pgsql -E 3857 --flat-nodes /srv/planet/planet/nodes.bin --cache 200 --number-processes 1 --append --slim -d ct --output multi --style cleartables.json -G -r osc changes-2391119-reduced.osc ; psql -d ct -c 'select osm_id,name from buildings where osm_id in (127018391);'</code></p>
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<<span class="pl-ent">node</span> <span class="pl-e">id</span>=<span class="pl-s"><span class="pl-pds">"</span>4780166730<span class="pl-pds">"</span></span> <span class="pl-e">version</span>=<span class="pl-s"><span class="pl-pds">"</span>1<span class="pl-pds">"</span></span> <span class="pl-e">timestamp</span>=<span class="pl-s"><span class="pl-pds">"</span>2017-04-07T01:00:20Z<span class="pl-pds">"</span></span> <span class="pl-e">uid</span>=<span class="pl-s"><span class="pl-pds">"</span>355617<span class="pl-pds">"</span></span> <span class="pl-e">user</span>=<span class="pl-s"><span class="pl-pds">"</span>pnorman<span class="pl-pds">"</span></span> <span class="pl-e">changeset</span>=<span class="pl-s"><span class="pl-pds">"</span>47524627<span class="pl-pds">"</span></span> <span class="pl-e">lat</span>=<span class="pl-s"><span class="pl-pds">"</span>49.2006186<span class="pl-pds">"</span></span> <span class="pl-e">lon</span>=<span class="pl-s"><span class="pl-pds">"</span>-122.9905754<span class="pl-pds">"</span></span>/>
<<span class="pl-ent">node</span> <span class="pl-e">id</span>=<span class="pl-s"><span class="pl-pds">"</span>4780166731<span class="pl-pds">"</span></span> <span class="pl-e">version</span>=<span class="pl-s"><span class="pl-pds">"</span>1<span class="pl-pds">"</span></span> <span class="pl-e">timestamp</span>=<span class="pl-s"><span class="pl-pds">"</span>2017-04-07T01:00:20Z<span class="pl-pds">"</span></span> <span class="pl-e">uid</span>=<span class="pl-s"><span class="pl-pds">"</span>355617<span class="pl-pds">"</span></span> <span class="pl-e">user</span>=<span class="pl-s"><span class="pl-pds">"</span>pnorman<span class="pl-pds">"</span></span> <span class="pl-e">changeset</span>=<span class="pl-s"><span class="pl-pds">"</span>47524627<span class="pl-pds">"</span></span> <span class="pl-e">lat</span>=<span class="pl-s"><span class="pl-pds">"</span>49.2005525<span class="pl-pds">"</span></span> <span class="pl-e">lon</span>=<span class="pl-s"><span class="pl-pds">"</span>-122.9904762<span class="pl-pds">"</span></span>/>
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</<span class="pl-ent">create</span>>
<<span class="pl-ent">modify</span>>
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<<span class="pl-ent">nd</span> <span class="pl-e">ref</span>=<span class="pl-s"><span class="pl-pds">"</span>1406709669<span class="pl-pds">"</span></span>/>
<<span class="pl-ent">nd</span> <span class="pl-e">ref</span>=<span class="pl-s"><span class="pl-pds">"</span>1406709672<span class="pl-pds">"</span></span>/>
<<span class="pl-ent">nd</span> <span class="pl-e">ref</span>=<span class="pl-s"><span class="pl-pds">"</span>4780166728<span class="pl-pds">"</span></span>/>
<<span class="pl-ent">nd</span> <span class="pl-e">ref</span>=<span class="pl-s"><span class="pl-pds">"</span>4780166726<span class="pl-pds">"</span></span>/>
<<span class="pl-ent">nd</span> <span class="pl-e">ref</span>=<span class="pl-s"><span class="pl-pds">"</span>4780166721<span class="pl-pds">"</span></span>/>
<<span class="pl-ent">nd</span> <span class="pl-e">ref</span>=<span class="pl-s"><span class="pl-pds">"</span>4780166723<span class="pl-pds">"</span></span>/>
<<span class="pl-ent">nd</span> <span class="pl-e">ref</span>=<span class="pl-s"><span class="pl-pds">"</span>4780166722<span class="pl-pds">"</span></span>/>
<<span class="pl-ent">nd</span> <span class="pl-e">ref</span>=<span class="pl-s"><span class="pl-pds">"</span>4780166724<span class="pl-pds">"</span></span>/>
<<span class="pl-ent">nd</span> <span class="pl-e">ref</span>=<span class="pl-s"><span class="pl-pds">"</span>4780166725<span class="pl-pds">"</span></span>/>
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<<span class="pl-ent">nd</span> <span class="pl-e">ref</span>=<span class="pl-s"><span class="pl-pds">"</span>1406709654<span class="pl-pds">"</span></span>/>
<<span class="pl-ent">nd</span> <span class="pl-e">ref</span>=<span class="pl-s"><span class="pl-pds">"</span>1406709657<span class="pl-pds">"</span></span>/>
<<span class="pl-ent">nd</span> <span class="pl-e">ref</span>=<span class="pl-s"><span class="pl-pds">"</span>4780166731<span class="pl-pds">"</span></span>/>
<<span class="pl-ent">nd</span> <span class="pl-e">ref</span>=<span class="pl-s"><span class="pl-pds">"</span>4780166730<span class="pl-pds">"</span></span>/>
<<span class="pl-ent">nd</span> <span class="pl-e">ref</span>=<span class="pl-s"><span class="pl-pds">"</span>4780166729<span class="pl-pds">"</span></span>/>
<<span class="pl-ent">nd</span> <span class="pl-e">ref</span>=<span class="pl-s"><span class="pl-pds">"</span>4780166732<span class="pl-pds">"</span></span>/>
<<span class="pl-ent">nd</span> <span class="pl-e">ref</span>=<span class="pl-s"><span class="pl-pds">"</span>1406709669<span class="pl-pds">"</span></span>/>
<<span class="pl-ent">tag</span> <span class="pl-e">k</span>=<span class="pl-s"><span class="pl-pds">"</span>amenity<span class="pl-pds">"</span></span> <span class="pl-e">v</span>=<span class="pl-s"><span class="pl-pds">"</span>restaurant<span class="pl-pds">"</span></span>/>
<<span class="pl-ent">tag</span> <span class="pl-e">k</span>=<span class="pl-s"><span class="pl-pds">"</span>building<span class="pl-pds">"</span></span> <span class="pl-e">v</span>=<span class="pl-s"><span class="pl-pds">"</span>yes<span class="pl-pds">"</span></span>/>
<<span class="pl-ent">tag</span> <span class="pl-e">k</span>=<span class="pl-s"><span class="pl-pds">"</span>name<span class="pl-pds">"</span></span> <span class="pl-e">v</span>=<span class="pl-s"><span class="pl-pds">"</span>Riverway Clubhouse<span class="pl-pds">"</span></span>/>
</<span class="pl-ent">way</span>>
</<span class="pl-ent">modify</span>>
</<span class="pl-ent">osmChange</span>></pre></div>
<p>The interesting bit is the node changes from alexandreos. With that XML as-is, I get zero rows in the query. If I remove the entire block or the first node I get the building in the rendering tables.</p>
<p>This is quite frankly, befuddling. Nothing is obviously different between the two alexandreos node changes except for id, latitude, and longitude.</p>
<p>c.f. <a href="https://phabricator.wikimedia.org/T160781">https://phabricator.wikimedia.org/T160781</a></p>
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