Hi,
Whoa, thanks for the heads-up! You may just have saved me from a whole
lot of trouble. Did you file a JIRA ticket already?
Thanks,
Ere
Flowerday, Matthew J kirjoitti 1.3.2021 klo 14.00:
Hi There
I just came across a situation where a unified highlighting search under
solr 8.8.0/8.8.1 can take over 20 mins to run and eventually times out.
I resolved it by a config change – but it can catch you out. Hence this
email.
With solr 8.8.0 a new unified highlighting parameter &hl.fragAlignRatio
was implemented which if not set defaults to 0.5. This attempts to
improve the high lighting so that highlighted text does not appear right
at the left. This works well but if you have a search result with
numerous occurrences of the word in question within the record
performance goes right down!
2021-02-27 06:45:03.151 INFO (qtp762476028-20) [ x:uleaf]
o.a.s.c.S.Request [uleaf] webapp=/solr path=/select
params={hl.snippets=2&q=test&hl=on&hl.maxAnalyzedChars=1000000&fl=id,description,specification,score&start=20&hl.fl=*&rows=10&_=1614405119134}
hits=57008 status=0 QTime=1414320
2021-02-27 06:45:03.245 INFO (qtp762476028-20) [ x:uleaf]
o.a.s.s.HttpSolrCall Unable to write response, client closed connection
or we are shutting down => org.eclipse.jetty.io.EofException
at
org.eclipse.jetty.io.ChannelEndPoint.flush(ChannelEndPoint.java:279)
org.eclipse.jetty.io.EofException: null
at
org.eclipse.jetty.io.ChannelEndPoint.flush(ChannelEndPoint.java:279)
~[jetty-io-9.4.34.v20201102.jar:9.4.34.v20201102]
at
org.eclipse.jetty.io.WriteFlusher.flush(WriteFlusher.java:422)
~[jetty-io-9.4.34.v20201102.jar:9.4.34.v20201102]
at
org.eclipse.jetty.io.WriteFlusher.completeWrite(WriteFlusher.java:378)
~[jetty-io-9.4.34.v20201102.jar:9.4.34.v20201102]
when I set &hl.fragAlignRatio=0.25 results came back much quicker
2021-02-27 14:59:57.189 INFO (qtp1291367132-24) [ x:holmes]
o.a.s.c.S.Request [holmes] webapp=/solr path=/select
params={hl.weightMatches=false&hl=on&fl=id,description,specification,score&start=1&hl.fragAlignRatio=0.25&rows=100&hl.snippets=2&q=test&hl.maxAnalyzedChars=1000000&hl.fl=*&hl.method=unified&timeAllowed=90000&_=1614430061690}
hits=136939 status=0 QTime=87024
And &hl.fragAlignRatio=0.1
2021-02-27 15:18:45.542 INFO (qtp1291367132-19) [ x:holmes]
o.a.s.c.S.Request [holmes] webapp=/solr path=/select
params={hl.weightMatches=false&hl=on&fl=id,description,specification,score&start=1&hl.fragAlignRatio=0.1&rows=100&hl.snippets=2&q=test&hl.maxAnalyzedChars=1000000&hl.fl=*&hl.method=unified&timeAllowed=90000&_=1614430061690}
hits=136939 status=0 QTime=69033
And &hl.fragAlignRatio=0.0
2021-02-27 15:20:38.194 INFO (qtp1291367132-24) [ x:holmes]
o.a.s.c.S.Request [holmes] webapp=/solr path=/select
params={hl.weightMatches=false&hl=on&fl=id,description,specification,score&start=1&hl.fragAlignRatio=0.0&rows=100&hl.snippets=2&q=test&hl.maxAnalyzedChars=1000000&hl.fl=*&hl.method=unified&timeAllowed=90000&_=1614430061690}
hits=136939 status=0 QTime=2841
I left our setting at 0.0 – this presumably how it was in 7.7.1 (fully
left aligned). I am not too sure as to how many time a word has to
occur in a record for performance to go right down – but if too many it
can have a BIG impact.
I also noticed that setting &timeAllowed=90000 did not break out of the
query until it finished. Perhaps because the query finished quickly and
what took the time was the highlighting. It might be an idea to get
&timeAllowed to also cover any highlighting so that the query does not
run until the jetty timeout is hit. The machine 100% one core for about
20 mins!.
Hope this helps.
Regards
Matthew
*Matthew Flowerday*| Consultant | ULEAF
Unisys | 01908 774830| matthew.flower...@unisys.com
<mailto:matthew.flower...@unisys.com>
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