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https://github.com/sigmasternchen/php-doc-en
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1.1.0 improvements on lazy connections and broadcasting to align state of pooled connections
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@317203 c90b9560-bf6c-de11-be94-00142212c4b1
This commit is contained in:
Ulf Wendel
parent
be11f1a0d1
commit
959f08ef08
2 changed files with 205 additions and 15 deletions
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@ -90,6 +90,18 @@
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</itemizedlist>
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</para>
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</listitem>
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<listitem>
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<simpara>
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List of broadcasted messages extended by <literal>ssl_set</literal>.
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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Library calls now monitored to remember settings for lazy connections:
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<literal>change_user</literal>, <literal>select_db</literal>,
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<literal>set_charset</literal>, <literal>set_autocommit</literal>.
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</simpara>
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</listitem>
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</itemizedlist>
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</para>
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<para>
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@ -82,7 +82,8 @@
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the user connection may change. The applications must be aware of this.
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</para>
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<para>
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The following list shows what the connection state consists of.
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The following list shows what the connection state consists of. The list
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may not be complete.
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</para>
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<para>
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<itemizedlist>
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@ -128,20 +129,140 @@
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</listitem>
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</itemizedlist>
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</para>
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<para>
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Connection switches happen right before queries are run. The plugin does
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not switch the current connection until the moment in time when
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the next statement is executed.
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</para>
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<para>
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Please, do not miss the MySQL reference manual chapter on
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replication features and issues. Some restrictions you hit may not be related
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to the PHP plugin but are properties of the MySQL replication system.
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</para>
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<para>Broadcasted messages</para>
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<para>
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The plugins philosophy is to align the state of connections in the
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pool only if the state is under full control of the plugin, or if it is
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necessary for security reasons. Just a few actions that change the
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state of the connection fall into this category. The plugin does broadcast
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the following state changing client calls to all currently open
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connections in the connection pool: <literal>change_user</literal>,
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<literal>select_db</literal>, <literal>set_charset</literal>,
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<literal>set_server_option</literal>, <literal>set_client_option</literal>,
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<literal>autocommit</literal>.
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state of the connection fall into this category.
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</para>
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<para>
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List of connection state changing client library calls broadcasted to all
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open connections in the connection pool.
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</para>
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<informaltable>
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<tgroup cols="3">
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<colspec colwidth="10%"/>
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<colspec colwidth="70%"/>
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<colspec colwidth="20%"/>
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<thead>
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<row>
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<entry>Library call</entry>
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<entry>Notes</entry>
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<entry>Version</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>
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<literal>change_user</literal>
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</entry>
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<entry>
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Called by the <literal>mysqli_change_user</literal> user API call.
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Also triggered upon reuse of a persistent <literal>mysqli</literal>
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connection.
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</entry>
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<entry>Since 1.0.0.</entry>
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</row>
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<row>
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<entry>
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<literal>select_db</literal>
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</entry>
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<entry>
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Called by the following user API calls:
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<function>mysql_select_db</function>,
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<function>mysql_list_tables</function>,
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<function>mysql_db_query</function>,
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<function>mysql_list_fields</function>,
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<function>mysqli_select_db</function>.
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</entry>
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<entry>Since 1.0.0.</entry>
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</row>
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<row>
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<entry>
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<literal>set_charset</literal>
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</entry>
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<entry>
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Called by the following user API calls:
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<function>mysql_set_charset</function>.
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<function>mysqli_set_charset</function>.
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</entry>
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<entry>Since 1.0.0.</entry>
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</row>
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<row>
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<entry>
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<literal>set_server_option</literal>
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</entry>
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<entry>
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Called by the following user API calls:
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<function>mysqli_multi_query</function>,
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<function>mysqli_real_query</function>,
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<function>mysqli_query</function>,
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<function>mysql_query</function>.
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</entry>
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<entry>Since 1.0.0.</entry>
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</row>
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<row>
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<entry>
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<literal>set_client_option</literal>
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</entry>
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<entry>
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Called by the following user API calls:
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<function>mysqli_options</function>,
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<function>mysqli_ssl_set</function>,
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<function>mysqli_connect</function>,
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<function>mysql_connect</function>,
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<function>mysql_pconnect</function>.
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</entry>
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<entry>Since 1.0.0.</entry>
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</row>
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<row>
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<entry>
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<literal>set_autocommit</literal>
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</entry>
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<entry>
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Called by the following user API calls:
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<function>mysqli_autocommit</function>,
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<function>PDO::setAttribute(PDO::ATTR_AUTOCOMMIT)</function>.
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</entry>
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<entry>Since 1.0.0. PHP >= 5.4.0.</entry>
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</row>
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<row>
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<entry>
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<literal>ssl_set</literal>
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</entry>
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<entry>
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Called by the following user API calls:
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<function>mysqli_ssl_set</function>.
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</entry>
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<entry>Since 1.1.0.</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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<para>
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If any of the above listed calls is to be executed,
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the plugin loops over all currently open master and slave connections.
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The loop continues until all servers have been contacted. The loop does
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not break, if a server indicates a failure. If possible, the failure will be
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propagated to the calling user API function. Depending on the user API
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function, which has triggered the underlying library function, users may
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be able to detect the failure.
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</para>
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<para>Broadcasting and lazy connections</para>
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<para>
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The plugin does not proxy or
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<quote>remember</quote> settings to apply them on connections
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<quote>remember</quote> all settings to apply them on connections
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opened in the future. This is important to remember, if
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using
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<link linkend="ini.mysqlnd-ms-plugin-config.lazy_connections">lazy connections</link>.
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@ -150,14 +271,71 @@
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Use of lazy connections is the default plugin action.
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</para>
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<para>
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Connection switches happen right before queries are run. The plugin does
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not switch the current connection until the moment in time when
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the next statement is executed.
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Settings of the following connection state changing library calls are
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recorded to be used when opening a lazy connection to ensure that connection
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state of all connections in the connection pool is comparable.
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</para>
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<informaltable>
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<tgroup cols="3">
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<colspec colwidth="10%"/>
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<colspec colwidth="70%"/>
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<colspec colwidth="20%"/>
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<thead>
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<row>
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<entry>Library call</entry>
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<entry>Notes</entry>
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<entry>Version</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>
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<literal>change_user</literal>
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</entry>
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<entry>
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User, password and database recorded for future use.
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</entry>
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<entry>Since 1.1.0.</entry>
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</row>
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<row>
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<entry>
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<literal>select_db</literal>
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</entry>
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<entry>
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Database recorded for future use.
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</entry>
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<entry>Since 1.1.0.</entry>
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</row>
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<row>
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<entry>
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<literal>set_charset</literal>
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</entry>
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<entry>
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Calls <literal>set_client_option(MYSQL_SET_CHARSET_NAME, charset)</literal>
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on lazy connection to ensure <literal>charset</literal> will be used
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upon opening the lazy connection.
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</entry>
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<entry>Since 1.1.0.</entry>
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</row>
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<row>
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<entry>
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<literal>set_autocommit</literal>
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</entry>
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<entry>
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Adds <literal>SET AUTOCOMMIT=0|1</literal> to the list of init commands
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of a lazy connection using
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<literal>set_client_option(MYSQL_INIT_COMMAND, "SET AUTOCOMMIT=...%quot;)</literal>.
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</entry>
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<entry>Since 1.1.0. PHP >= 5.4.0.</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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<para>
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Please, do not miss the MySQL reference manual chapter on
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replication features and issues. Some restrictions you hit may not be related
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to the PHP plugin but are properties of the MySQL replication system.
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Please note that the connection state is not only changed by API calls. Thus,
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even if PECL mysqlnd_ms monitors all API calls, the application still needs
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to take care. Ultimately, it is in the application developers reposibility
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to maintain connection state, if needed.
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</para>
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</section>
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@ -226,7 +404,7 @@
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</para>
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<para>
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An user who does not change the connection state after opening a connection
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may activate automatic master failover.
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may activate automatic master failover.
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</para>
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<para>
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The failover policy is configured in the plugins configuration file by help
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