solr 4.x 特性:局部更新索引

该功能在 lucene4.x 的更新日志中有提到,最近终于找到了相关的说明,详见更新文档的单个字段。该功能看起来相当不错,假设要索引文章的新闻,新闻有个点击数的字段,需要搜索的结果按点击数排序时,这样 就能把点击数也写进索引库,单点击数变化时,单独更新点击数即可,此前是需要重现更新整个索引的,包括文章内容、标题等。这个说明中只提到了用 curl 方式类更新,理论上在 solrj 中也会有相关的接口。另外从描述中看,它只提到了,不需要送其他字段的值,不知道是否 solr 内部将其他字段读取出来,然后再自行索引进去,如果是这样的,整个性能就不济了,只是方便用户少送几个字段。具体情况需要测试一下或者跟踪一下源码

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