HAYASHI Kentaro
null+****@clear*****
Sat Nov 29 11:55:17 JST 2014
HAYASHI Kentaro 2014-11-29 11:55:17 +0900 (Sat, 29 Nov 2014) New Revision: 97a26aab8c7a2bff0e072114e4ecb1388d5bbdf5 https://github.com/groonga/groonga.org/commit/97a26aab8c7a2bff0e072114e4ecb1388d5bbdf5 Message: Add Groonga 4.0.8 release entry Added files: en/_posts/2014-11-29-release.md Added: en/_posts/2014-11-29-release.md (+93 -0) 100644 =================================================================== --- /dev/null +++ en/_posts/2014-11-29-release.md 2014-11-29 11:55:17 +0900 (e0c32e9) @@ -0,0 +1,93 @@ +--- +layout: post.en +title: Groonga 4.0.8 has been released +description: Groonga 4.0.8 has been released! +--- + +## Groonga 4.0.8 has been released + +[Groonga 4.0.8](/docs/news.html#release-4-0-8) has been released! + +How to install: [Install](/docs/install.html) + +### Changes + +In this release, there are following topics: + + * [experimental] Supported auto sequantial search mode for in_values and between + * [experimental] Supported drilldown by multiple keys + * [experimental] Supported range_filter command + * Default HTTP server package is changed to groonga-httpd + +#### Supported auto sequantial search mode for in_values and between + +In this release, auto sequantial search mode is supported for `in_values` and `between`. + +There is a case that sequential search is faster than index search when the number of narrowed down records is small enough in contrast to the number of expected records to narrow down by `in_values` with AND operation which use indexes. + +The value of `GRN_IN_VALUES_TOO_MANY_INDEX_MATCH_RATIO` is used as threshold whether Groonga execute sequential search or search with indexes in such a case. + +This behavior is customized by following environment variable. + +in_values(): + + # Don't use auto sequential search + GRN_IN_VALUES_TOO_MANY_INDEX_MATCH_RATIO=-1 + # Set threshold to 0.02 + GRN_IN_VALUES_TOO_MANY_INDEX_MATCH_RATIO=0.02 + +between(): + + # Don't use auto sequential search + GRN_BETWEEN_TOO_MANY_INDEX_MATCH_RATIO=-1 + # Set threshold to 0.02 + GRN_BETWEEN_TOO_MANY_INDEX_MATCH_RATIO=0.02 + +#### Supported drilldown by multiple keys + +In this release, Groonga has supported drilldown by multiple keys. + +The syntax is extended to support this feature. + +for keys: + + --drilldown[LABEL1].keys COLUMN1,COLUMN2 for keys, + +for output_columns: + + --drilldown[LABEL1].output_columns _value.COLUMN1,_value.COLUMN2,_nsubrecs + +In the previous versions, a client application must implement by oneself for drilldown by multiple keys. + +Use `_key[N]` for `--drilldown[LABEL1].output_columns` to show original value of key in records. + +Note that this feature requires version 2 of command because it extends syntax. Don't forget to specify --command_version 2. + +#### Supported range_filter command + +In this release, `range_filter` command is added. + +It is faster than select command to fetch specific range of records in most cases, because it doesn't returns the number of matched records. + +There are limitations which doesn't support drilldown and so on, because it need to know the number of matched records. + +Thus, `range_filter` is suitable for extracting first N records in specific range +for ranking or something else. + +#### Default HTTP server package is changed to groonga-httpd + +In this release, `groonga-httpd` became default HTTP server package. Groonga-server-http package is deprecated. + +Note that groonga HTTP server functionality itself is still exists in Groonga. + +If you just want to use simple HTTP server in traditional way, specify proper arguments by command line for groonga command. + +Here is the sample for simple HTTP server. + + % groonga -s --protocol http testdb/db + +### Conclusion + +See [Release 4.0.8 2014/11/29](/docs/news.html#release-4-0-8) about detailed changes since 4.0.7. + +Let's search by Groonga! -------------- next part -------------- HTML����������������������������...下載
