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Add a variable for appending a custom message to server read_only error
Summary: Proposing a way to set a custom message in the `--read-only (super)` error. Note: the variable can only be set when server is in read-only (super) state. p.s. I am hesitant to add a mutex for the variable, so we will get a snapshot of the current pointer of the variable (const char*) when printing the error. Squash with https://reviews.facebook.net/D61383 Test Plan: Added tests. Reviewers: santoshb Reviewed By: santoshb Subscribers: webscalesql-eng, ebergen Differential Revision: https://reviews.facebook.net/D61713
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‎mysql-test/r/bug58669.result‎

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@@ -11,6 +11,7 @@ user1@localhost
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SHOW VARIABLES LIKE "read_only%";
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Variable_name Value
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read_only ON
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read_only_error_msg_extra
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read_only_slave ON
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INSERT INTO db1.t1 VALUES (1);
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ERROR HY000: The MySQL server is running with the --read-only option so it cannot execute this statement

‎mysql-test/r/mysqld--help-notwin-profiling.result‎

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@@ -872,6 +872,9 @@ The following options may be given as the first argument:
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--read-only Make all non-temporary tables read-only, with the
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exception for replication (slave) threads and users with
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the SUPER privilege
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--read-only-error-msg-extra[=name]
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Set this variable to print out extra error information,
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which will be appended to read_only error messages.
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--read-only-slave Blocks disabling read_only if the server is a slave. This
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is helpful in asserting that read_only is never disabled
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on a slave. Slave with read_only=0 may generate new GTID
@@ -1796,6 +1799,7 @@ range-alloc-block-size 4096
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rbr-idempotent-tables (No default value)
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read-buffer-size 131072
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read-only FALSE
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read-only-error-msg-extra
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read-only-slave TRUE
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read-rnd-buffer-size 262144
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relay-log (No default value)

‎mysql-test/r/mysqld--help-notwin.result‎

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@@ -870,6 +870,9 @@ The following options may be given as the first argument:
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--read-only Make all non-temporary tables read-only, with the
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exception for replication (slave) threads and users with
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the SUPER privilege
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--read-only-error-msg-extra[=name]
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Set this variable to print out extra error information,
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which will be appended to read_only error messages.
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--read-only-slave Blocks disabling read_only if the server is a slave. This
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is helpful in asserting that read_only is never disabled
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on a slave. Slave with read_only=0 may generate new GTID
@@ -1793,6 +1796,7 @@ range-alloc-block-size 4096
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rbr-idempotent-tables (No default value)
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read-buffer-size 131072
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read-only FALSE
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read-only-error-msg-extra
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read-only-slave TRUE
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read-rnd-buffer-size 262144
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relay-log (No default value)

‎mysql-test/suite/rpl/r/rpl_read_only.result‎

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@@ -121,6 +121,12 @@ insert into t1 values(1006);
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ERROR HY000: The MySQL server is running with the --read-only option so it cannot execute this statement. Current master_host: 127.0.0.1, master_port: MASTER_PORT
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insert into t2 values(2006);
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ERROR HY000: The MySQL server is running with the --read-only option so it cannot execute this statement. Current master_host: 127.0.0.1, master_port: MASTER_PORT
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set global read_only_error_msg_extra = "This is a custom message";
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insert into t1 values(1006);
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ERROR HY000: The MySQL server is running with the --read-only option so it cannot execute this statement. Current master_host: 127.0.0.1, master_port: MASTER_PORT. This is a custom message
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insert into t2 values(2006);
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ERROR HY000: The MySQL server is running with the --read-only option so it cannot execute this statement. Current master_host: 127.0.0.1, master_port: MASTER_PORT. This is a custom message
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set global read_only_error_msg_extra = default;
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drop user test;
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drop table t1;
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drop table t2;

‎mysql-test/suite/rpl/t/rpl_read_only.test‎

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@@ -15,6 +15,7 @@ create user test;
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connect (master2,127.0.0.1,test,,test,$MASTER_MYPORT,);
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connect (slave2,127.0.0.1,test,,test,$SLAVE_MYPORT,);
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connect (slave2_root,127.0.0.1,root,,test,$SLAVE_MYPORT,);
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connection master1;
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@@ -119,6 +120,18 @@ insert into t1 values(1006);
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--replace_result $MASTER_MYPORT MASTER_PORT
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--error ER_OPTION_PREVENTS_STATEMENT_EXTRA_INFO
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insert into t2 values(2006);
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# set extra info for the error message
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connection slave2_root;
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set global read_only_error_msg_extra = "This is a custom message";
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connection slave2;
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--replace_result $MASTER_MYPORT MASTER_PORT
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--error ER_OPTION_PREVENTS_STATEMENT_EXTRA_INFO
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insert into t1 values(1006);
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--replace_result $MASTER_MYPORT MASTER_PORT
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--error ER_OPTION_PREVENTS_STATEMENT_EXTRA_INFO
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insert into t2 values(2006);
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connection slave2_root;
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set global read_only_error_msg_extra = default;
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# Verify read_only cannot be disabled on slave
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connection slave;

‎mysql-test/suite/sys_vars/r/read_only_error_msg_extra_basic.result‎

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set @@global.read_only_error_msg_extra='Not in read_only';
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ERROR HY000: The system variable read_only_error_msg_extra can only be set in read-only (super) status.
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set global read_only = true;
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set @@global.read_only_error_msg_extra = default;
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select @@global.read_only_error_msg_extra;
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@@global.read_only_error_msg_extra
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set @saved_read_only_error_msg_extra = @@global.read_only_error_msg_extra;
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set @@global.read_only_error_msg_extra='This is a custom message';
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set global super_read_only = true;
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set @@global.read_only_error_msg_extra='This is another custom message';
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set @@global.read_only_error_msg_extra=1;
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ERROR 42000: Incorrect argument type to variable 'read_only_error_msg_extra'
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select @@session.read_only_error_msg_extra;
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ERROR HY000: Variable 'read_only_error_msg_extra' is a GLOBAL variable
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set @@session.read_only_error_msg_extra='This is a custom message';
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ERROR HY000: Variable 'read_only_error_msg_extra' is a GLOBAL variable and should be set with SET GLOBAL
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set global read_only_error_msg_extra = @saved_read_only_error_msg_extra;
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set global super_read_only = false;
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set global read_only = false;

‎mysql-test/suite/sys_vars/t/read_only_error_msg_extra_basic.test‎

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--source include/not_embedded.inc
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# Cannot set the value if server is not in read_only
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--error ER_VARIABLE_NOT_SETTABLE_WITHOUT_READ_ONLY
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set @@global.read_only_error_msg_extra='Not in read_only';
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set global read_only = true;
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set @@global.read_only_error_msg_extra = default;
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select @@global.read_only_error_msg_extra;
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set @saved_read_only_error_msg_extra = @@global.read_only_error_msg_extra;
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set @@global.read_only_error_msg_extra='This is a custom message';
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set global super_read_only = true;
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set @@global.read_only_error_msg_extra='This is another custom message';
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--error ER_WRONG_TYPE_FOR_VAR
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set @@global.read_only_error_msg_extra=1;
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--error ER_INCORRECT_GLOBAL_LOCAL_VAR
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select @@session.read_only_error_msg_extra;
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--error ER_GLOBAL_VARIABLE
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set @@session.read_only_error_msg_extra='This is a custom message';
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set global read_only_error_msg_extra = @saved_read_only_error_msg_extra;
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set global super_read_only = false;
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set global read_only = false;

‎sql/mysqld.cc‎

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@@ -504,6 +504,7 @@ my_bool block_create_myisam = FALSE;
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my_bool block_create_memory = FALSE;
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my_bool block_create_no_primary_key = FALSE;
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my_bool read_only= 0, opt_readonly= 0;
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char* opt_read_only_error_msg_extra;
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my_bool super_read_only = 0, opt_super_readonly = 0;
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my_bool use_temp_pool, relay_log_purge;
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my_bool relay_log_recovery;

‎sql/mysqld.h‎

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@@ -296,6 +296,7 @@ extern ulong slave_run_triggers_for_rbr;
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extern ulonglong slave_type_conversions_options;
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extern ulonglong admission_control_filter;
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extern my_bool read_only, opt_readonly, super_read_only, opt_super_readonly;
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extern char* opt_read_only_error_msg_extra;
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extern my_bool send_error_before_closing_timed_out_connection;
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extern my_bool allow_document_type;
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extern my_bool block_create_myisam;

‎sql/share/errmsg-utf8.txt‎

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@@ -7229,6 +7229,9 @@ ER_CONNECTION_TIMEOUT
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ER_OPTION_PREVENTS_STATEMENT_EXTRA_INFO
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eng "The MySQL server is running with the %s option so it cannot execute this statement. %s"
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ER_VARIABLE_NOT_SETTABLE_WITHOUT_READ_ONLY
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eng "The system variable %.200s can only be set in read-only (super) status."
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#
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# End of 5.6 error messages.
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#

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