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Merge pull request #2329 from annando/1602-poller-db

Poller: Check the number of used database connections
pull/2331/head
Tobias Diekershoff 6 years ago
parent
commit
3c97a6703c
  1. 10
      include/items.php
  2. 37
      include/poller.php

10
include/items.php

@ -509,6 +509,16 @@ function item_store($arr,$force_parent = false, $notify = false, $dontcache = fa
$arr['inform'] = ((x($arr,'inform')) ? trim($arr['inform']) : '');
$arr['file'] = ((x($arr,'file')) ? trim($arr['file']) : '');
if (($arr['author-link'] == "") AND ($arr['owner-link'] == "")) {
$trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 5);
foreach ($trace AS $func)
$function[] = $func["function"];
$function = implode(", ", $function);
logger("Both author-link and owner-link are empty. Called by: ".$function, LOGGER_DEBUG);
}
if ($arr['plink'] == "") {
$a = get_app();
$arr['plink'] = $a->get_baseurl().'/display/'.urlencode($arr['guid']);

37
include/poller.php

@ -26,6 +26,9 @@ function poller_run(&$argv, &$argc){
unset($db_host, $db_user, $db_pass, $db_data);
};
if (poller_max_connections_reached())
return;
$load = current_load();
if($load) {
$maxsysload = intval(get_config('system','maxloadavg'));
@ -117,6 +120,40 @@ function poller_run(&$argv, &$argc){
}
/**
* @brief Checks if the number of database connections has reached a critical limit.
*
* @return bool Are more than 3/4 of the maximum connections used?
*/
function poller_max_connections_reached() {
$r = q("SHOW VARIABLES WHERE `variable_name` = 'max_connections'");
if (!$r)
return false;
$max = intval($r[0]["Value"]);
if ($max == 0)
return false;
$r = q("SHOW STATUS WHERE `variable_name` = 'Threads_connected'");
if (!$r)
return false;
$connected = intval($r[0]["Value"]);
if ($connected == 0)
return false;
$level = $connected / $max;
logger("Connection usage: ".$connected."/".$max, LOGGER_DEBUG);
if ($level < (3/4))
return false;
logger("Maximum level (3/4) of connections reached: ".$connected."/".$max);
return true;
}
/**
* @brief fix the queue entry if the worker process died
*

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