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Shuffle up the way we figure out which image to rebuild next so that

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multiple concurrent tasks actually work in parallel and don't stomp
on each other.  Fixes #1498.
This commit is contained in:
Bharat Mediratta
2010-11-21 13:03:02 -08:00
parent 12b77c7ef4
commit 5f4ab7fd76
1 changed files with 6 additions and 1 deletions
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modules/gallery/helpers/gallery_task.php
+6 -1
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@@ -71,7 +71,12 @@ class gallery_task_Core {
static function rebuild_dirty_images($task) {
$errors = array();
try {
$result = graphics::find_dirty_images_query()->select("id")->execute();
// Choose the dirty images in a random order so that if we run this task multiple times
// concurrently each task is rebuilding different images simultaneously.
$result = graphics::find_dirty_images_query()->select("id")
->select(new Database_Expression("RAND() as r"))
->order_by("r", "ASC")
->execute();
$total_count = $task->get("total_count", $result->count());
$mode = $task->get("mode", "init");
if ($mode == "init") {