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From Andy Reek <>
Subject WG: Performance Issue since Solr 7.7 with wt=javabin
Date Mon, 17 Jun 2019 15:26:40 GMT
Hi Solr team,

we are using Solr in version 7.1 as search engine in our online shop (SAP Hybris). And as
a task I needed to migrate to the most recent Solr in version 7 (7.7). Doing this I faced
extreme performance issues. After debugging and testing different setups I found out, that
they were caused by the parameter wt=javabin. These issues begin to raise since version 7.7,
in 7.6 it is still working as fast as in 7.1.

Just an example: Doing a simple query for *.* and wt=javabin in 7.6: 0.2 seconds and in 7.7:
34 seconds!

The configuration of the schema.xml and solrconfig.xml are equal in both versions. Version
8.1 has the same effect as 7.7. Using something other than wt=javabin (e.g. wt=xml) will work
fast in every version - which is our current workaround.

To reproduce this issue I have attached my used configsets folder plus some test data. This
all can be tested with docker and wget:

Solr 7.6:

docker run -d --name solr7.6 -p 8983:8983 --rm -v $PWD/configsets/default:/opt/solr/server/solr/configsets/myconfig:ro
solr:7.6-slim solr-create -c mycore -d /opt/solr/server/solr/configsets/myconfig
docker cp $PWD/data.json solr7.6:/opt/solr/data.json
docker exec -it --user solr solr7.6 bin/post -c mycore data.json
wget "http://localhost:8983/solr/mycore/select?q=*:*&wt=javabin&rows=9999"

Solr 7.7:
docker run -d --name solr7.7 -p 18983:8983 --rm -v $PWD/configsets/default:/opt/solr/server/solr/configsets/myconfig:ro
solr:7.7-slim solr-create -c mycore -d /opt/solr/server/solr/configsets/myconfig
docker cp $PWD/data.json solr7.7:/opt/solr/data.json
docker exec -it --user solr solr7.7 bin/post -c mycore data.json

For me it seems like a bug. But if not, then please let me know what I did wrong ;-)

Best Regards,

Andy Reek
Principal Software Developer

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