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https://issues.apache.org/jira/browse/SOLR-9506?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15585709#comment-15585709
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Yonik Seeley commented on SOLR-9506:
------------------------------------
Pretty simple to try out:
{code}
bin/solr start -e techproducts
http://localhost:8983/solr/techproducts/query?q=*:*
"response":{"numFound":32,"start":0,"docs":[
http://localhost:8983/solr/techproducts/get?getFingerprint=9223372036854775807
{
"fingerprint":{
"maxVersionSpecified":9223372036854775807,
"maxVersionEncountered":1548538118066405376,
"maxInHash":1548538118066405376,
"versionsHash":8803836617561505377,
"numVersions":32,
"numDocs":32,
"maxDoc":32}}
curl http://localhost:8983/solr/techproducts/update?commit=true -H
"Content-Type: text/xml" -d '<delete><id>apple</id></delete>'
# this shows that the delete is visibie
http://localhost:8983/solr/techproducts/query?q=*:*
"response":{"numFound":31,"start":0,"docs":[
#fingerprint returns the same thing
http://localhost:8983/solr/techproducts/get?getFingerprint=9223372036854775807
{
"fingerprint":{
"maxVersionSpecified":9223372036854775807,
"maxVersionEncountered":1548538118066405376,
"maxInHash":1548538118066405376,
"versionsHash":8803836617561505377,
"numVersions":32,
"numDocs":32,
"maxDoc":32}}
bin/solr stop -all
bin/solr start -e techproducts
#after a restart, fingerprint returns something different
http://localhost:8983/solr/techproducts/get?getFingerprint=9223372036854775807
{
"fingerprint":{
"maxVersionSpecified":9223372036854775807,
"maxVersionEncountered":1548538118066405376,
"maxInHash":1548538118066405376,
"versionsHash":-1315083666674066080,
"numVersions":31,
"numDocs":31,
"maxDoc":32}}
{code}
> cache IndexFingerprint for each segment
> ---------------------------------------
>
> Key: SOLR-9506
> URL: https://issues.apache.org/jira/browse/SOLR-9506
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Noble Paul
> Attachments: SOLR-9506.patch, SOLR-9506.patch, SOLR-9506_POC.patch
>
>
> The IndexFingerprint is cached per index searcher. it is quite useless during
> high throughput indexing. If the fingerprint is cached per segment it will
> make it vastly more efficient to compute the fingerprint
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