HAYASHI Kentaro
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Tue Mar 29 11:48:39 JST 2016
HAYASHI Kentaro 2016-03-29 11:48:39 +0900 (Tue, 29 Mar 2016) New Revision: 768ca3f15aa4b671bdf9451971397affd797ae1c https://github.com/groonga/groonga.org/commit/768ca3f15aa4b671bdf9451971397affd797ae1c Message: blog en: 6.0.1 blog entry Added files: en/_posts/2016-03-29-groonga-6.0.1.md Added: en/_posts/2016-03-29-groonga-6.0.1.md (+93 -0) 100644 =================================================================== --- /dev/null +++ en/_posts/2016-03-29-groonga-6.0.1.md 2016-03-29 11:48:39 +0900 (a30f30b) @@ -0,0 +1,93 @@ +--- +layout: post.en +title: Groonga 6.0.1 has been released +description: Groonga 6.0.1 has been released! +--- + +## Groonga 6.0.1 has been released + +[Groonga 6.0.1](/docs/news.html#release-6-0-1) has been released! + +How to install: [Install](/docs/install.html) + +### Changes + +Here are three topics in this release: + + * [hash] Supported 4GiB over total key size + * Supported to remove dependent tables + * [experimental] Supported to split chunks in static indexing + +This release includes some bug fixes of load command, so upgrade Groonga! + +### [hash] Supported 4GiB over total key size + +In this release, 4GiB over total key size is supported for a hash table. + +In the previous versions of Groonga, there is a limitation about total key size of a table - 4GiB total key size. + +Such a limitation is now relaxed. By using ``KEY_LARGE`` flag with a table, the value of new limitation of the total key size is changed to 1TiB. + +Here is the example to use ``KEY_LARGE`` flag: + +``` +table_create Users TABLE_HASH_KEY|KEY_LARGE ShortText +``` + +As a result, it handles more large table data in a hash table. + +### Supported to remove dependent tables + +In this release, a feature to remove dependent tables is supported for ``table_remove`` and ``logical_table_remove`` command. + +In the previous versions of Groonga, removing tables are failed by default when the following conditions are met: + +* One or more tables use the table as key type. +* One or more columns use the table as value type. + +This is a intended behavior because it is aimed not to remove referenced table unexpectedly by default. + +On the other hand, it is a bit hard to remove if there are many dependent tables which you want to remove at once. + +For such a purpose, the feature "--dependent yes" is implemented. + +Here is the sample schema: + +``` +table_create ReferencedTable TABLE_HASH_KEY ShortText +table_create Table1 TABLE_HASH_KEY ReferencedTable +table_create Table2 TABLE_NO_KEY +column_create Table2 reference_column COLUMN_SCALAR ReferencedTable +``` + +When "table_remove ReferencedTable" is executed, it just fails because ``ReferencedTable`` is the key of ``Table1`` and referenced from ``reference_column`` of ``Table2``. + +Execute "table_remove ReferencedTable --dependent yes" is executed, ``Table1`` and ``reference_column`` of ``Table2`` are removed correctly. + +NOTE: there is a case that "--dependent yes" consumes a lot of resources if there are many dependent tables because it opens all dependent tables and columns temporary. If command fails, reduce the max number of threads by "thread_limit 1" command as a workaround. + +### [experimental] Supported to split chunks in static indexing + +In this release, splitting chunks in static indexing are supported. + +It is aimed to achieve fast phrase search when frequently used word and rarely used word are specified at the same time. + +To enable this feature, set the following environment variable and execute offline index construction: + +``` +GRN_INDEX_CHUNK_SPLIT_ENABLE=1 +``` + +And enable the following environment variable: + +``` +GRN_II_CURSOR_SET_MIN_ENABLE=1 +``` + +This feature is disabled by default because it is not widely tested yet, but it is verified to improve phrase search performance in a test case. + +### Conclusion + +See [Release 6.0.1 2016-03-29](/docs/news.html#release-6-0-1) about detailed changes since 6.0.0. + +Let's search by Groonga! -------------- next part -------------- HTML����������������������������...Download