The filter caching features in Solr allow for precise control over how filter queries are handled in order to maximize performance. Solr has the ability to specify if a filter is cached, specify the order filters are evaluated, and specify post filtering. Solr Filter Queries Adding a filter expressed as […]
solr
Lucene/Solr background Lucene has a segmented architecture – when a small amount of documents are added to an existing index, this will often just add an additional small segment to the index. Caching data structures at the segment level (e.g. field values used for sorting) is often desirable so that […]
Off-Heap FieldCache Faceting and Sorting
I’ve often seen mistaken descriptions of Solr as just “a http wrapper around Lucene”. Unfortunately that mischaracterization was never nipped in the bud early enough and has continued to be repeated in many places such as press articles (where it is picked up and repeated again). Of course people who […]
A History of Lucene and Solr
Macro Expansion is a new Solr 5.1 feature that does parameter substitution across all request parameters. The macro expansion is done at the same point in time that default parameters are applied (i.e. when the request reaches the correct solr request handler). This means that request handler defaults, appends, and […]
Parameter Substitution / Macro Expansion
Solr 4.8 has been released. Here’s an overview of how to use some of the new features. Also see Solr download links and upcoming features of the next Solr release. Complex Phrase Queries The complexphrase query parser can produce phrase queries with embedded wildcards and boolean queries. It works via […]
Solr 4.8 Features
Heliosearch’s off-heap FieldCache was previously introduced and benchmarked for integer fields. Support for all numeric field types as well as string fields has now been completed, and this post will focus on the performance of string fields. A review of nCache (n is for “native”) features and goals: nCache has […]
Heliosearch/Solr Off-Heap FieldCache Performance
nCache Heliosearch has a new replacement for the Lucene FieldCache currently used by Solr for sorting, faceting, and function queries. Introducing nCache (n is for “native”): nCache has Off-Heap Data-structures, just like the Off-Heap Filters to lower garbage collection pauses and GC overhead. nCache is a managed cache, meaning […]
nCache: Heliosearch/Solr Off-Heap FieldCache
Off-Heap Native Filters is the first feature we added to Heliosearch, a new open source project designed to bring Solr performance to the next level. Big JVM heaps can be Big Trouble JVMs have never been good at dealing with large heaps. Large heaps mean lots of garbage collection work, […]
Heliosearch/Solr Off-Heap Filters
The Solr 5 Tutorial is Here Getting Started with Solr: a Simple Solr Tutorial Note: this tutorial is for Solr 4 1. Download Solr Download Apache Solr 4. You only need to download the single .ZIP or .TGZ file and extract it anywhere you like – no installation is required!! […]
Getting Started with Solr
The filter caching features in Solr allow for precise control over how filter queries are handled in order to maximize performance. Solr has the ability to specify if a filter is cached, specify the order filters are evaluated, and specify post filtering. Solr Filter Queries Adding a filter expressed as […]