Jerry Chung created SOLR-17753:
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Summary: Occasional slow search request processing
Key: SOLR-17753
URL: https://issues.apache.org/jira/browse/SOLR-17753
Project: Solr
Issue Type: Improvement
Components: search
Affects Versions: 9.6.1
Reporter: Jerry Chung
Case 1: Slow post processing (?)
with 77 shards, main shard searches seemed to complete within 5 seconds, but it
took 31 seconds to complete.
Logs:
{quote}1: 100.66.200.188: 2025-04-23 16:53:23.878: shard9_replica_n621: hits=0
status=0 QTime=202
...
10: 100.66.129.167: 2025-04-23 16:53:24.055: shard10_replica_n77: hits=4
status=0 QTime=484
...
20: 100.65.167.116: 2025-04-23 16:53:24.147: shard63_replica_n798: hits=0
status=0 QTime=454
...
30: 100.66.221.246: 2025-04-23 16:53:24.318: shard2_replica_n623: hits=2
status=0 QTime=715
...
40: 100.66.19.80: 2025-04-23 16:53:24.758: shard74_replica_n901: hits=0
status=0 QTime=1106
...
50: 100.66.57.242: 2025-04-23 16:53:25.141: shard69_replica_n854: hits=0
status=0 QTime=1451
...
60: 100.66.109.242: 2025-04-23 16:53:25.824: shard19_replica_n181: hits=1
status=0 QTime=2113
...
70: 100.66.110.69: 2025-04-23 16:53:26.708: shard32_replica_n313: hits=1
status=0 QTime=3033
...
76: 100.66.11.43: 2025-04-23 16:53:28.427: shard17_replica_n548: hits=17
status=0 QTime=4733
77: 100.65.228.101: 2025-04-23 16:53:54.578: shard52_replica_n698: status=0
QTime=3
78: 100.66.106.218: 2025-04-23 16:53:54.580: shard57_replica_n740: status=0
QTime=3
85: 100.66.59.172: 2025-04-23 16:53:54.584: shard51_replica_n692: status=0
QTime=6
86: 100.65.136.1: 2025-04-23 16:53:54.585: shard42_replica_n562:
rid=\{9b6b00ea-80c1-448b-812d-d967ff5a6c6a} hits=178 status=0 QTime=31072
{quote}
There were 26 second gab between log 76 and 77. For normal case, there are no
such big gabs.
Case 2: Slow start to process a request
According to our log, we submitted a request at 2025-04-24T11:01:10.783, but
Solr started processing 2025-04-24 11:01:29.856
{quote}100.65.228.101: 2025-04-24 11:01:30.099: shard8_replica_n103:
rid=\{d5bd0a4e-cbae-4c3b-994a-c0868efacb59} hits=11 status=0 QTime=272
{quote}
In this case, query time is short on Solr, but the processing time to our
client took 19 seconds
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