Hey all, we want to avoid cold start performance issues when the caches are cleared after a server restart.
For this, we have written a SearchComponent that saves least recently used queries. These are written to a file inside a closeHook of a SolrCoreAware at server shutdown. The plan is to perform these queries at server startup to warm up the caches. For this, we have written a derivative of the QuerySenderListener and configured it as firstSearcher listener in solrconfig.xml. The only difference to the origin QuerySenderListener is that it gets it's queries from the formerly dumped lru queries rather than getting them from the config file. It seems that everything is called correctly, and we have the impression that the query response times for the dumped queries are sometimes slightly better than without this warming. Nevertheless, there is still a huge difference against the times when we manually perform the same queries once, e.g. from a browser. If we do this, the second time we perform these queries they respond much faster (up to 10 times) than the response times after the implemented warming. It seems that not all caches are warmed up during our warming. And because of these huge differences, I doubt we missed something. The index has about 25M documents, and is splitted into two shards in a cloud configuration, both shards are on the same server instance for now, for testing purposes. Does anybody have an idea? I tried to disable lazy field loading as a potential issue, but with no success. Cheers, Christian
