On Thu, Nov 2, 2023 at 5:01 AM rajani m <rajinima...@gmail.com> wrote:

> Sorry, it took too long to get back to this one.
>
>  The search query "http://host:8983/solr/v9/select?&q=*&rows=10";
> consistently
> took ~500 ms.  With "distrib=false" all the 96 shards have QTime 0-25 ms.
> Does this mean aggregation of results from all the shards is taking ~475
> ms? I also tried shards.rows=5 and it still returned in ~475 ms query time.
>

Giving that. Don't you have any limits for ShardHandlerFactory set in
solr.xml?
debugQuery=true or debug=track can produce verbose shard request tracing
info. Perhaps it might get some clue.
Full fledged approach is
https://solr.apache.org/guide/solr/latest/deployment-guide/distributed-tracing.html
for sure.
Might it be a problem of slow dns names resolution?
Does it still slow on rows=0?
-- 
Sincerely yours
Mikhail Khludnev

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