It seems that you got this handed over with little documentation. You have to explore what the import handler does. This is a custom configuration that you need to check how it works.
Then as already said. You can simply install another version of Solr if you are within a Solr major version 8.x in Linux is simply a symbolic link pointing from one Solr version to the other. In this way you can easily switch back as well. Finally, check your memory consumption. Normally heap is significant smaller then the total available memory as the non-heap memory is used by Solr for caching. If you have 8g mb of heap I would expect that the total amount of memory available is more than 32 gb. As always it depends, but maybe you can give more details on no of cores, heap memory, total memory and if other processes than Solr run on the machine. > Am 24.12.2019 um 05:59 schrieb Ken Walker <kenwalker...@gmail.com>: > > Hello, > > We are using solr version 8.2.0 in our production server. > > We are upgrading solr version from solr 8.2.0 version to solr 8.3.1 > version but we have faced out of memory error while importing data and > then we have extended memory in our server and then again start > importing process but it has work too slowy for 8GB data ( it has > taken more than 2 days for importing data from solr 8.2.0 version to > solr 8.3.1 version). > > Could you please help me how we can do it fast for importing 8GB data > from old solr version to new solr version? > > We are using below command for importing data from one solr version to > another solr version > $ curl > 'http://IP-ADDRESS:8983/solr/items/dataimport?command=full-import&clean=true&commit=false&wt=json&indent=true&verbose=false&optimize=false&debug=false' > > Thanks in advance! > - Ken
