In this chapter, we learned how to troubleshoot common problems and also covered how to deal with corrupted and locked indexes, reducing the number of files in the index, and how to truncate the index size. We also learned how to tackle issues caused due to expensive garbage collections, out-of-memory, too many opened files, infinite loop execution while playing around with shards, and how to update a single field in all documents without full indexation activity.
In the next chapter, we will learn how to use ZooKeeper for performance-optimization purposes and will cover how to set up, configure, and deploy ZooKeeper. We will also understand the different applications of ZooKeeper that can help us optimize our Solr's performance.
