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1e87babb19
We cann connect() in a non-blocking mode to be able to specify a non-standard timeout. The problem was that we did not fetch the status from the non-blocking connect(). We assumed that poll() would not return a POLLIN flag if the connect failed. But on some platforms this is not true. After a successful poll() we do now retrieve the status value from connect() with getsockopt(...SO_ERROR...). Now we do know if (and how) the connect failed. The test case for my investigation was rpl.rlp_ssl1 on an Ubuntu 9.04 x86_64 machine. Both, IPV4 and IPV6 were active. 'localhost' resolved first for IPV6 and then for IPV4. The connection over IPV6 was blocked. rpl.rlp_ssl1 timed out as it did not notice the failed connect(). The first read() failed, which was interpreted as a master crash and the connection was tried to reestablish with the same result until the retry limit was reached. With the fix, the connect() problem is immediately recognized, and the connect() is retried on the second resolution for 'localhost', which is successful.
84 lines
3 KiB
PHP
84 lines
3 KiB
PHP
# ==== Purpose ====
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#
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# Waits until SHOW SLAVE STATUS has returned a specified value, or
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# until a timeout is reached.
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#
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# ==== Usage ====
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#
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# let $slave_param= Slave_SQL_Running;
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# let $slave_param_value= No;
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# source include/slave_wait_param.inc;
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#
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# Parameters:
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#
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# $slave_param, $slave_param_value
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# This macro will wait until the column of the output of SHOW SLAVE
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# STATUS named $slave_param gets the value $slave_param_value. See
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# the example above.
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#
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# $slave_param_comparison
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# By default, this file waits until $slave_param becomes equal to
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# $slave_param_value. If you want to wait until $slave_param
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# becomes *unequal* to $slave_param_value, set this parameter to the
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# string '!=', like this:
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# let $slave_param_comparison= !=;
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#
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# $slave_timeout
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# The default timeout is 5 minutes. You can change the timeout by
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# setting $slave_timeout. The unit is tenths of seconds.
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#
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# $master_connection
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# If the timeout is reached, debug info is given by calling SHOW
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# SLAVE STATUS, SHOW PROCESSLIST, and SHOW BINLOG EVENTS. Then, a
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# 'connection master' is then issued, and more debug info is given
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# by calling SHOW MASTER STATUS, SHOW PROCESSLIST, and SHOW BINLOG
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# EVENTS. If $master_connection is set, the latter three commands
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# will be issued on $master_connection instead of on the host named
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# 'master'. See also show_rpl_debug_info.inc
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#
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# $slave_error_message
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# If set, this is printed when a timeout occurs. This is primarily
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# intended to be used by other wait_for_slave_* macros, to indicate
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# what the purpose of the wait was. (A very similar error message is
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# given by default, but the wait_for_slave_* macros use this to give
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# an error message identical to that in previous versions, so that
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# errors are easier searchable in the pushbuild history.)
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let $_slave_timeout_counter= $slave_timeout;
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if (!$_slave_timeout_counter)
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{
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let $_slave_timeout_counter= 3000;
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}
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# Save resulting counter for later use.
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let $slave_tcnt= $_slave_timeout_counter;
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let $_slave_param_comparison= $slave_param_comparison;
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if (`SELECT '$_slave_param_comparison' = ''`)
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{
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let $_slave_param_comparison= =;
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}
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let $_show_slave_status_value= query_get_value("SHOW SLAVE STATUS", $slave_param, 1);
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while (`SELECT NOT('$_show_slave_status_value' $_slave_param_comparison '$slave_param_value') AND $_slave_timeout_counter > 0`)
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{
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dec $_slave_timeout_counter;
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if ($_slave_timeout_counter)
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{
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sleep 0.1;
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let $_show_slave_status_value= query_get_value("SHOW SLAVE STATUS", $slave_param, 1);
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}
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}
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# This has to be outside the loop until BUG#41913 has been fixed
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if (!$_slave_timeout_counter)
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{
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--echo **** ERROR: timeout after $slave_tcnt deci-seconds while waiting for slave parameter $slave_param $_slave_param_comparison $slave_param_value ****
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if (`SELECT '$slave_error_message' != ''`)
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{
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--echo Message: $slave_error_message
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}
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--echo Current connection is '$CURRENT_CONNECTION'
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echo Note: the following output may have changed since the failure was detected;
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source include/show_rpl_debug_info.inc;
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exit;
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}
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