Solr docValues用法 [英] Solr docValues usage

问题描述

我计划尝试使用Solr的docValues来改善构面和排序性能。我对此功能有一些疑问：

I am planning to try Solr's docValues to hopefully improve facet and sort performance. I have some questions around this feature:

1. 如果启用了docValues，Solr除了创建单独的索引外还将创建前向索引（用于构面）反向索引（用于搜索）？还是Solr仅会创建一个前向索引？ （因此，通过在分面中获得性能提升来换取搜索中的性能损失）


2. 如果我想在一个字段中同时进行分面和搜索，那么最佳实践是什么？我应该在同一字段中设置 indexed = true和 docValues = true，还是创建一个副本字段，其中源字段的索引值为true，而目标字段的值为docValues = true？ （即，优化源字段以进行搜索，而目的字段进行分面；甚至需要这样做？）


3. 以下文档页面：即使该字段是单值构面字段，也为 true 。我有点困惑-这仅适用于将与docvalues一起使用的复制字段（目标）还是对非复制字段也适用？

1. If I enable docValues, will Solr create a forward index (for faceting) in addition to a separate reverse index (for searching)? Or will Solr simply create a forward index ONLY? (thus, resulting to performance gain in faceting in exchange for performance loss in searching)
2. If I want to both facet and search in a single field, what is the best practice? Should I set "indexed=true" and "docValues=true" in the same field or should I create a copy field where the source field has indexed=true while the destination field has docValues=true? (i.e. optimize the source field for search while the dest field for faceting; is this even needed?)
3. The following documentation page from Datastax states: "for faceting to use docValues, the schema needs to specify multiValued="true" even if the field is a single-value facet field". I'm a bit confused - is this only true for copy fields (dest) that are to be used with docvalues or is this true even for non-copy fields?

我正在使用Datastax Enterprise 4.5.2

I am using Datastax Enterprise 4.5.2

推荐答案

Solr faceting实现将仅使用DocValues如果它们被标记为多值，那么除非您的字段实际上是多值的，否则我建议使用非存储的复制字段，其值为multiValued = true和docValues = true，以避免将您的单值字段存储为Cassandra列表/设置。

Solr faceting implementation will make use of DocValues only if they're marked as multivalued, so unless your field is actually multivalued, I'd suggest to use a non-stored copy field with multiValued=true and docValues=true, to avoid storing your single-value field as a Cassandra list/set.

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