Merge pull request #273 from phlipper/add-myisam-read-buffer-size-config

Add `myisam_read_buffer_size` attribute

README.md

@@ -340,6 +340,7 @@ default["percona"]["server"]["bulk_insert_buffer_size"] = "64M"
 default["percona"]["server"]["myisam_recover_options"] = "BACKUP"
 default["percona"]["server"]["myisam_sort_buffer_size"] = "128M"
 default["percona"]["server"]["myisam_max_sort_file_size"] = "10G"
+default["percona"]["server"]["myisam_read_buffer_size"] = "8M"
 default["percona"]["server"]["myisam_repair_threads"] = 1
 
 # InnoDB Specific
@@ -675,6 +676,8 @@ Many thanks go to the following [contributors](https://github.com/phlipper/chef-
     * fix `ConfigHelper` definitions to make them available from `module_function`
 * **[@dng-dev](https://github.com/dng-dev)**
     * add `innodb_import_table_from_xtrabackup` attribute
+* **[@washingtoneg](https://github.com/washingtoneg)**
+    * add `myisam_read_buffer_size` attribute
 
 
 ## License

attributes/default.rb

@@ -136,6 +136,7 @@
 default["percona"]["server"]["myisam_recover_options"] = "BACKUP"
 default["percona"]["server"]["myisam_sort_buffer_size"] = "128M"
 default["percona"]["server"]["myisam_max_sort_file_size"] = "10G"
+default["percona"]["server"]["myisam_read_buffer_size"] = "8M"
 default["percona"]["server"]["myisam_repair_threads"] = 1
 
 # InnoDB Specific

templates/default/my.cnf.main.erb

@@ -382,6 +382,19 @@ bulk_insert_buffer_size = <%= node["percona"]["server"]["bulk_insert_buffer_size
 # large settings.
 myisam_sort_buffer_size = <%= node["percona"]["server"]["myisam_sort_buffer_size"] %>
 
+# This buffer is allocated when MySQL does a sequential scan for a MyISAM
+# table. It is allocated per thread so be careful with large settings.
+# Note that the maximum permissible setting for read_buffer_size is 2GB.
+# The value of this variable should be a multiple of 4KB. If it is set to
+# a value that is not a multiple of 4KB, its value will be rounded down
+# to the nearest multiple of 4KB.
+# This option is also used in the following context for all search engines:
+# For caching the indexes in a temporary file (not a temporary table), when
+# sorting rows for ORDER BY.
+# For bulk insert into partitions.
+# For caching results of nested queries.
+myisam_read_buffer_size = <%= node["percona"]["server"]["myisam_read_buffer_size"] %>
+
 # The maximum size of the temporary file MySQL is allowed to use while
 # recreating the index (during REPAIR, ALTER TABLE or LOAD DATA INFILE.
 # If the file-size would be bigger than this, the index will be created