We just took an installation of 4.1 which was working fine and changed it to run as solr cloud. We encountered the most incredibly bizarre apparent bug:
In the JSON output, a colon ':' changed to a comma ',', which of course broke the JSON parser. I'm guessing I should file this as a bug, but it was so odd I thought I'd post here before doing so. Demo below: Here is a query on our previous single-server instance: Query: ---------- http://10.1.3.28:8081/solr/select?q=book&fl=score%2Cid%2Cunique_catalog_name &start=0&rows=50&wt=json&group=true&group.field=unique_catalog_name&group.li mit=50 Response: ------------- {"responseHeader":{"status":0,"QTime":15714,"params":{"fl":"score,id,unique_ catalog_name","start":"0","q":"book","group.limit":"50","group.field":"uniqu e_catalog_name","group":"true","wt":"json","rows":"50"}},"grouped":{"unique_ catalog_name":{"matches":106711214,"groups":[{"groupValue":"ls:2653","doclis t":{"numFound":103981882,"start":0,"maxScore":4.7039795,"docs":[{"id":"10055 02088784","score":4.7039795},{"id":"1005500291075","score":4.7039795},{"id": "1000810546074","score":4.7039795},{"id":"1000611003270","score":4.7039795}, Note this part: ------------------ {"unique_catalog_name":{"matches": Now we run that same query on a server that was derived from the same build, just configuration changes to run it in distributed "solr cloud" mode. Query: --------- http://10.1.3.18:8081/solr/select?q=book&fl=score%2Cid%2Cunique_catalog_name &start=0&rows=50&wt=json&group=true&group.field=unique_catalog_name&group.li mit=50 Response: -------------{"responseHeader":{"status":0,"QTime":8855,"params":{"fl":"scor e,id,unique_catalog_name","start":"0","q":"book","group.limit":"50","group.f ield":"unique_catalog_name","group":"true","wt":"json","rows":"50"}},"groupe d":["unique_catalog_name",{"matches":106711214,"groups":[{"groupValue":"ls:2 653","doclist":{"numFound":103981882,"start":0,"maxScore":4.7042913,"docs":[ {"id":"1005502088784","score":4.7042913},{"id":"1000611003270","score":4.704 2913},{"id":"1005500291075","score":4.703668},{"id":"1000810546074","score": 4.703668}, Note how it's changed: ---------------------------- "unique_catalog_name",{"matches":
