blog en: add 7.0.2 entry

en/_posts/2017-04-29-groonga-7.0.2.md

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+---
+layout: post.en
+title: Groonga 7.0.2 has been released
+description: Groonga 7.0.2 has been released!
+---
+
+## Groonga 7.0.2 has been released
+
+[Groonga 7.0.2](/docs/news.html#release-7-0-1) has been released!
+
+How to install: [Install](/docs/install.html)
+
+This release contains a fix to loose data by reindex command, please upgrade Groonga!
+
+### Changes
+
+Here are important changes in this release:
+
+  * Fixed a bug that data is lost by reindex
+  * Supported Ubuntu 17.04 (Zesty Zapus)
+  * Supported persistent cache
+  * Added function to use an existing table as condition patterns.
+
+#### Fixed a bug that data is lost by reindex
+
+Since Groonga 5.1.0, [reindex](/docs/reference/commands/reindex.html) command is added, but there is a possibility that data is lost by this command.
+
+Here is the sample to reproduce this bug.
+
+    > table_create User TABLE_HASH_KEY ShortText
+    [[0,1490948112.512871,0.004843950271606445],true]
+    > table_create Comment TABLE_NO_KEY
+    [[0,1490948112.517823,0.004474639892578125],true]
+    > column_create Comment user COLUMN_SCALAR User
+    [[0,1490948112.522444,0.00609898567199707],true]
+    > column_create User comment COLUMN_INDEX Comment user
+    [[0,1490948112.528664,0.009341239929199219],true]
+    > load --table Comment
+    > [
+    > {"user":"Mike"}
+    > ]
+    [[0,1490948112.538067,0.0004284381866455078],1]
+
+    > select User
+    [[0,1490948112.538533,0.0002899169921875],[[[1],[["_id","UInt32"],["_key","ShortText"],["comment","UInt32"]],[1,"Mike",1]]]]
+    > select Comment
+    [[0,1490948112.53886,4.744529724121094e-05],[[[1],[["_id","UInt32"],["user","User"]],[1,"Mike"]]]]
+
+    > reindex
+    [[0,1490948112.538933,0.02556586265563965],true]
+
+    > select User
+    [[0,1490948112.564538,5.91278076171875e-05],[[[0],[["_id","UInt32"],["_key","ShortText"],["comment","UInt32"]]]]]
+    > select Comment
+    [[0,1490948112.564621,3.457069396972656e-05],[[[1],[["_id","UInt32"],["user","User"]],[1,""]]]]
+
+In above sample, the data of ``User`` table and ``Comment`` are lost after execution of reindex command.
+
+#### Supported Ubuntu 17.04 (Zesty Zapus)
+
+In this release, Ubuntu 17.04 (Zesty Zapus) is supported!
+
+On the other hand, Ubuntu 12.04 reached EOL at April 28, 2017. So, it was dropped from supported platform.
+
+#### Supported persistent cache
+
+In this release, persistent cache feature is supported.
+
+The cache of Groonga is lost after restarting, but by using this feature, there is no need to reconstruct cache from a scratch.
+
+If you use ``groonga`` command, use ``--cache-base-path`` option.
+
+This option specifies where to save persistent cache.
+
+If you use ``groonga-httpd``, use ``groonga_cache_base_path`` directive.
+Here is the sample configuration about ``groonga_cache_base_path``.
+
+    http {
+      ...
+      groonga_cache_base_path /dev/shm/groonga-httpd-cache;
+      ...
+    }
+
+Persistent cache configuration is shared among workers. Thus the number of cache limit will be also shared in the future.
+
+Here are some caution to use this feature:
+
+* Use base path on memory file system for performance reason.
+* Cache limit configuration is not supported yet.
+* Remove cache file when groonga has crashed.
+
+#### Added function to use an existing table as condition patterns
+
+In this release, ``in_records` function is added to use an existing table as condition patterns. Each record in the existing table is treated as a condition pattern.
+
+By using ``in_records`` function, you may be able to reduce multiple queries to only one query by ``in_records``.
+
+### Conclusion
+
+See [Release 7.0.2 2017-04-29](/docs/news.html#release-7-0-2) about detailed changes since 7.0.1.
+
+Let's search by Groonga!