发布于 2017-06-07 10:49:36 | 127 次阅读 | 评论: 0 | 来源: 网友投递
Apache Solr 企业级全文搜索引擎
Solr是一个独立的企业级搜索应用服务器，它对外提供类似于Web-service的API接口。用户可以通过http请求，向搜索引擎服务器提交一定格式的XML文件，生成索引；也可以通过Http Get操作提出查找请求，并得到XML格式的返回结果；
Apache Solr 6.6.0 发布了，本次更新值得关注的亮点：
Payload support with payload() value source and {!payload_score} and {!payload_check} query parsers
Solr support for SimpleTextCodec
Multi-field support to TermsComponent when requesting terms' statistics
New AtomicUpdateProcessor to convert normal update operations to atomic update operations
UPLOAD command (Config Set API) for uploading zipped configsets
MOVEREPLICA command (Collections API) for moving a replica across nodes
LISTALIASES command (Collections API) to return a list of all collection aliases
STATUS command (Core Admin API) to emit collection details of each core
Basic authentication can be enabled/disabled using bin/solr|bin/solr.cmd
Solr default/example uses WordDelimiterGraphFilterFactory and SynonymGraphFilterFactory
Expose cache statistics using metrics API
CloudSolrClient can now be initialized using the base URL of a Solr instance instead of ZooKeeper hosts
Grouping, CollapseQParser and ExpandComponent support with PointFields
Variance and Standard Deviation aggregators for the JSON Facet API
JSON Faceting now supports a query time 'join' domain change option
CartesianProductStream, which turns a single tuple with a multi-valued field into N tuples, one for each value in the multi-valued field
New Streaming Evaluators: Basic math, UUID, Date/time, correlation, regress, predict, covariance, convolution, normalize
New Streaming Expressions: shuffle, echo, eval, timeseries, let, get, tuple