About solr document not to be commited based on condition - solr

Question

I am trying to find a way to block the solr commit using solr api based on certain condition.
Currently, every solr document index has an unique id. So how could I update the solr api that it does not commit to solr index if already the id is present based on my below code:
SolrInputDocument solrDoc = new SolrInputDocument();
solrDoc.addField("id", indexUrl);
solrDoc.addField("price",100);
HttpSolrServer server = new HttpSolrServer(endpoint);
UpdateResponse response = server.add(solrDoc);
server.commit();
Thanks

Answer 1

You're mistaking Solr for an SQL server... Solr commit is nothing like SQL commit.
The idea behind Solr commit is to lower the amount of writes to the disk. Solr is not transactional... you don't have a rollback ability - except maybe erasing the tlog folder manually. You'll need to rewrite the commit feature entirely to do what you want.
You can query Solr for the id's before sending them, but you have no ACID guarantees that by the time they are sent and committed there won't be other documents with the same id already in.
You could maybe get an ACID guarantee by using a shared SQL server to generate an ID for you. Or by using zooKeeper to do the same (although harder to configure).