{"id":591,"date":"2026-09-28T13:34:22","date_gmt":"2026-09-28T05:34:22","guid":{"rendered":"https:\/\/dangnh.cf\/?p=591"},"modified":"2026-09-28T13:34:24","modified_gmt":"2026-09-28T05:34:24","slug":"lai-noi-ve-race-conditions-va-queued-jobs","status":"publish","type":"post","link":"https:\/\/dangnh.cf\/vi\/2026\/09\/28\/lai-noi-ve-race-conditions-va-queued-jobs\/","title":{"rendered":"L\u1ea1i n\u00f3i v\u1ec1 Race Conditions v\u00e0 Queued Jobs"},"content":{"rendered":"\n<figure class=\"wp-block-image alignwide size-large\"><a href=\"https:\/\/i0.wp.com\/dangnh.cf\/wp-content\/uploads\/2026\/09\/van-ong-vien-bat-khoi-ban-ap-xuat-phat-tren-uong-chay-mau-o.jpg?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"960\" height=\"1440\" data-attachment-id=\"590\" data-permalink=\"https:\/\/dangnh.cf\/vi\/van-ong-vien-bat-khoi-ban-ap-xuat-phat-tren-uong-chay-mau-o\/\" data-orig-file=\"https:\/\/i0.wp.com\/dangnh.cf\/wp-content\/uploads\/2026\/09\/van-ong-vien-bat-khoi-ban-ap-xuat-phat-tren-uong-chay-mau-o.jpg?fit=1600%2C2400&amp;ssl=1\" data-orig-size=\"1600,2400\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;,&quot;alt&quot;:&quot;&quot;}\" data-image-title=\"van-ong-vien-bat-khoi-ban-ap-xuat-phat-tren-uong-chay-mau-o\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Photo by &lt;a href=&quot;https:\/\/unsplash.com\/@nhoizey?utm_source=WP+Agent&amp;#038;utm_medium=referral&quot;&gt;Nicolas Hoizey&lt;\/a&gt; on &lt;a href=&quot;https:\/\/unsplash.com\/?utm_source=WP+Agent&amp;#038;utm_medium=referral&quot;&gt;Unsplash&lt;\/a&gt;&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/dangnh.cf\/wp-content\/uploads\/2026\/09\/van-ong-vien-bat-khoi-ban-ap-xuat-phat-tren-uong-chay-mau-o.jpg?fit=683%2C1024&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/dangnh.cf\/wp-content\/uploads\/2026\/09\/van-ong-vien-bat-khoi-ban-ap-xuat-phat-tren-uong-chay-mau-o.jpg?resize=960%2C1440&#038;ssl=1\" alt=\"V\u1eadn \u0111\u1ed9ng vi\u00ean b\u1eadt kh\u1ecfi b\u00e0n \u0111\u1ea1p xu\u1ea5t ph\u00e1t tr\u00ean \u0111\u01b0\u1eddng ch\u1ea1y m\u00e0u \u0111\u1ecf\" class=\"wp-image-590\" srcset=\"https:\/\/i0.wp.com\/dangnh.cf\/wp-content\/uploads\/2026\/09\/van-ong-vien-bat-khoi-ban-ap-xuat-phat-tren-uong-chay-mau-o.jpg?w=1600&amp;ssl=1 1600w, https:\/\/i0.wp.com\/dangnh.cf\/wp-content\/uploads\/2026\/09\/van-ong-vien-bat-khoi-ban-ap-xuat-phat-tren-uong-chay-mau-o.jpg?resize=200%2C300&amp;ssl=1 200w, https:\/\/i0.wp.com\/dangnh.cf\/wp-content\/uploads\/2026\/09\/van-ong-vien-bat-khoi-ban-ap-xuat-phat-tren-uong-chay-mau-o.jpg?resize=683%2C1024&amp;ssl=1 683w, https:\/\/i0.wp.com\/dangnh.cf\/wp-content\/uploads\/2026\/09\/van-ong-vien-bat-khoi-ban-ap-xuat-phat-tren-uong-chay-mau-o.jpg?resize=768%2C1152&amp;ssl=1 768w, https:\/\/i0.wp.com\/dangnh.cf\/wp-content\/uploads\/2026\/09\/van-ong-vien-bat-khoi-ban-ap-xuat-phat-tren-uong-chay-mau-o.jpg?resize=1024%2C1536&amp;ssl=1 1024w, https:\/\/i0.wp.com\/dangnh.cf\/wp-content\/uploads\/2026\/09\/van-ong-vien-bat-khoi-ban-ap-xuat-phat-tren-uong-chay-mau-o.jpg?resize=1365%2C2048&amp;ssl=1 1365w, https:\/\/i0.wp.com\/dangnh.cf\/wp-content\/uploads\/2026\/09\/van-ong-vien-bat-khoi-ban-ap-xuat-phat-tren-uong-chay-mau-o.jpg?resize=8%2C12&amp;ssl=1 8w, https:\/\/i0.wp.com\/dangnh.cf\/wp-content\/uploads\/2026\/09\/van-ong-vien-bat-khoi-ban-ap-xuat-phat-tren-uong-chay-mau-o.jpg?resize=1140%2C1710&amp;ssl=1 1140w\" sizes=\"auto, (max-width: 960px) 100vw, 960px\" \/><\/a><figcaption class=\"wp-element-caption\">Xu\u1ea5t ph\u00e1t tr\u01b0\u1edbc ti\u1ebfng c\u00f2i. Photo by <a href=\"https:\/\/unsplash.com\/@nhoizey?utm_source=WP+Agent&amp;utm_medium=referral\">Nicolas Hoizey<\/a> on <a href=\"https:\/\/unsplash.com\/?utm_source=WP+Agent&amp;utm_medium=referral\">Unsplash<\/a><\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1ed9t bu\u1ed5i s\u00e1ng th\u1ee9 hai y\u00ean b\u00ecnh, sau 1 b\u00e1t ph\u1edf v\u00e0 1 ly n\u00e2u \u0111\u00e1 s\u1eb5n s\u00e0ng tr\u00ean b\u00e0n, m\u1edf laptop ra th\u00ec Slack channel monitor <strong>\u0111\u1ecf l\u00f2m<\/strong>&#8230; B\u1ea3ng <code>failed_jobs<\/code> c\u1ee7a m\u1ed9t shop t\u00f4i l\u00e0m c\u00f3 th\u00eam v\u00e0i tr\u0103m d\u00f2ng gi\u1ed1ng h\u1ec7t nhau: <code>ModelNotFoundException: No query results for model [App\\Models\\Order] 48213<\/code>. M\u1edf database l\u00ean xem th\u00ec\u2026 order 48213 n\u1eb1m s\u1edd s\u1edd \u1edf \u0111\u00f3. Retry job b\u1eb1ng tay: ch\u1ea1y ngon. Ch\u1ea1y l\u1ea1i lu\u1ed3ng checkout tr\u00ean local: Ch\u1ea1y c\u0169ng v\u1eabn ngon!<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bug ki\u1ec3u n\u00e0y t\u00f4i kh\u00e1 quen r\u1ed3i, ch\u1eafc ch\u1eafn l\u00fac process job b\u1ecb race conditions, d\u1eabn t\u1edbi job kh\u00f4ng t\u00ecm th\u1ea5y record v\u00ec n\u00f3 ch\u01b0a \u0111\u01b0\u1ee3c t\u1ea1o. Bug ki\u1ec3u n\u00e0y kh\u00e1 kh\u00f3 debug, t\u00f4i nghi read replica b\u1ecb lag. Kh\u00f4ng ph\u1ea3i.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sau khi m\u00f2 m\u1eabm g\u1ea7n 2 ti\u1ebfng th\u00ec th\u1ee7 ph\u1ea1m l\u00e0 m\u1ed9t d\u00f2ng <code>dispatch()<\/code> n\u1eb1m b\u00ean trong <code>DB::transaction()<\/code>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Chuy\u1ec7n g\u00ec x\u1ea3y ra trong 20ms \u0111\u00f3?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Code checkout h\u1ed3i \u0111\u00f3, r\u00fat g\u1ecdn:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"language-php\">DB::transaction(function () use ($cart, $payment) {\n    $order = Order::create([...]);\n    $order-&gt;items()-&gt;createMany($cart-&gt;toItems());\n    $this-&gt;gateway-&gt;capture($payment, $order-&gt;total); \/\/ g\u1ecdi ra ngo\u00e0i, 300-800ms\n    SendOrderConfirmation::dispatch($order);\n    PushOrderToErp::dispatch($order);\n});<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u00f4ng th\u00ec h\u1ee3p l\u00fd. T\u1ea1o order => thu ti\u1ec1n => trigger job => commit. Nh\u01b0ng th\u1ee9 t\u1ef1 th\u1eadt s\u1ef1 \u1edf runtime l\u00e0 nh\u01b0 v\u1ea7y: <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>dispatch()<\/code> \u0111\u1ea9y job l\u00ean Redis <strong>ngay l\u1eadp t\u1ee9c<\/strong>, trong khi transaction c\u1ee7a b\u1ea1n v\u1eabn \u0111ang open (ch\u01b0a commit). <\/li>\n\n\n\n<li>Worker l\u00e0 m\u1ed9t process kh\u00e1c, c\u1ea7m m\u1ed9t DB connection kh\u00e1c, nh\u1eadn job trong v\u00f2ng v\u00e0i ms v\u00e0 b\u1eaft \u0111\u1ea7u ch\u1ea1y.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Trait <code>SerializesModels<\/code> kh\u00f4ng serialize c\u1ea3 model v\u00e0o payload, n\u00f3 ch\u1ec9 l\u01b0u class v\u00e0 id. Khi worker unserialize, h\u00e0m <code>restoreModel()<\/code> trong <code>Illuminate\\Queue\\SerializesAndRestoresModelIdentifiers<\/code> ch\u1ea1y \u0111\u00fang m\u1ed9t c\u00e2u: <code>firstOrFail()<\/code> theo id. M\u00e0 \u1edf connection c\u1ee7a worker, order 48213 ch\u01b0a t\u1ed3n t\u1ea1i. Transaction b\u00ean kia c\u00f2n \u0111ang ch\u1edd payment gateway tr\u1ea3 l\u1eddi.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">V\u1eady l\u00e0 job ch\u1ebft v\u1edbi <code>ModelNotFoundException<\/code>. V\u00e0i tr\u0103m ms sau th\u00ec transaction commit, order xu\u1ea5t hi\u1ec7n, v\u00e0 b\u1ea1n ng\u1ed3i nh\u00ecn c\u00e1i row \u0111\u00f3 m\u00e0 t\u1ef1 h\u1ecfi sao th\u1eb1ng worker n\u00e0y ngu th\u1ebf (ch\u1ea3 bi\u1ebft ai ngu zzz).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1ed9t chi ti\u1ebft nh\u1ecf m\u00e0 t\u00f4i \u01b0\u1edbc m\u00ecnh bi\u1ebft s\u1edbm h\u01a1n: <code>restoreModel()<\/code> c\u00f3 g\u1ecdi <code>useWritePdo()<\/code>. Ngh\u0129a l\u00e0 Laravel \u0111\u00e3 ch\u1ee7 \u0111\u1ed9ng <strong><em>\u0111\u1ecdc t\u1eeb master<\/em><\/strong> ch\u1ee9 kh\u00f4ng \u0111\u1ecdc replica khi rehydrate model cho job. Read replica lag kh\u00f4ng ph\u1ea3i nguy\u00ean nh\u00e2n, v\u00e0 t\u00f4i \u0111\u00e3 t\u1ed1n m\u1ed9t bu\u1ed5i s\u00e1ng&#8230;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sao local kh\u00f4ng bao gi\u1edd d\u00ednh?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">V\u00ec local c\u1ee7a \u0111a s\u1ed1 ch\u00fang ta ch\u1ea1y <code>QUEUE_CONNECTION=sync<\/code>. Driver sync ch\u1ea1y job inline, ngay t\u1ea1i d\u00f2ng <code>dispatch()<\/code>, tr\u00ean c\u00f9ng m\u1ed9t DB connection v\u1edbi transaction. C\u00f9ng connection th\u00ec th\u1ea5y \u0111\u01b0\u1ee3c row ch\u01b0a commit. M\u1ecdi th\u1ee9 xanh l\u00e8.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ngay c\u1ea3 khi b\u1ea1n c\u00f3 Redis v\u00e0 worker tr\u00ean docker, c\u0169ng kh\u00f3 t\u00e1i hi\u1ec7n. Local kh\u00f4ng c\u00f3 payment gateway th\u1eadt, transaction \u0111\u00f3ng trong 5ms, worker ch\u01b0a k\u1ecbp poll th\u00ec \u0111\u00e3 commit r\u1ed3i. Tr\u00ean production, c\u00e1i call ra ngo\u00e0i m\u1ea5t 300ms l\u00e0 qu\u00e1 \u0111\u1ee7 cho worker th\u1eafng cu\u1ed9c \u0111ua.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Bug xu\u1ea5t hi\u1ec7n khi transaction \u0111\u1ee7 ch\u1eadm. V\u00e0 production lu\u00f4n t\u00ecm \u0111\u01b0\u1ee3c c\u00e1ch l\u00e0m transaction \u0111\u1ee7 ch\u1eadm.<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">after_commit: m\u1ed9t d\u00f2ng config \u0111\u01a1n gi\u1ea3n gi\u1ea3i quy\u1ebft m\u1ecdi v\u1ea5n \u0111\u1ec1<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Thay v\u00ec ng\u1ed3i v\u00f2 \u0111\u1ea7u b\u1ee9t tai ch\u1ec9nh l\u1ea1i flow order logic, Laravel c\u00f3 s\u1eb5n c\u00e1ch x\u1eed l\u00fd, n\u1eb1m trong <code>config\/queue.php<\/code>, key <code>after_commit<\/code> c\u1ee7a t\u1eebng queue connection. Skeleton hi\u1ec7n t\u1ea1i (b\u1ea3n 13.x) set n\u00f3 l\u00e0 <code>false<\/code> cho c\u1ea3 <code>database<\/code>, <code>redis<\/code> l\u1eabn <code>sqs<\/code>. Ngh\u0129a l\u00e0 m\u1eb7c \u0111\u1ecbnh b\u1ea1n \u0111ang \u1edf trong t\u00ecnh hu\u1ed1ng tr\u00ean.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"language-php\">\/\/ config\/queue.php\n'redis' =&gt; [\n    'driver' =&gt; 'redis',\n    'connection' =&gt; env('REDIS_QUEUE_CONNECTION', 'default'),\n    'queue' =&gt; env('REDIS_QUEUE', 'default'),\n    'retry_after' =&gt; (int) env('REDIS_QUEUE_RETRY_AFTER', 90),\n    'after_commit' =&gt; true, \/\/ m\u1eb7c \u0111\u1ecbnh l\u00e0 false\n],<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">B\u1eadt l\u00ean th\u00ec <code>dispatch()<\/code> b\u00ean trong transaction s\u1ebd ch\u1edd t\u1edbi khi transaction ngo\u00e0i c\u00f9ng commit r\u1ed3i m\u1edbi \u0111\u1ea9y job l\u00ean queue. Kh\u00f4ng c\u00f3 transaction n\u00e0o m\u1edf th\u00ec \u0111\u1ea9y ngay nh\u01b0 c\u0169. Job, queued listener, mailable, notification, broadcast event: t\u1ea5t c\u1ea3 \u0111\u1ec1u \u0111i theo setting n\u00e0y.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu kh\u00f4ng mu\u1ed1n b\u1eadt global, b\u1ea1n c\u00f3 th\u1ec3 \u0111\u01a1n gi\u1ea3n ch\u1ecdn t\u1eebng ch\u1ed7 (not recommended):<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"language-php\">\/\/ T\u1eebng l\u1ea7n dispatch\nPushOrderToErp::dispatch($order)-&gt;afterCommit();\n\/\/ Ho\u1eb7c \u0111\u00e1nh d\u1ea5u \u1edf class, kh\u1ecfi nh\u1edb m\u1ed7i l\u1ea7n g\u1ecdi\nuse Illuminate\\Contracts\\Queue\\ShouldQueueAfterCommit;\nclass PushOrderToErp implements ShouldQueueAfterCommit\n{\n    use Queueable;\n    \/\/ ...\n}\n\/\/ Event c\u0169ng c\u00f3 b\u1ea3n t\u01b0\u01a1ng \u0111\u01b0\u01a1ng\nuse Illuminate\\Contracts\\Events\\ShouldDispatchAfterCommit;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">T\u00f4i th\u00edch c\u00e1ch \u0111\u00e1nh d\u1ea5u \u1edf class h\u01a1n. S\u00e1u th\u00e1ng sau c\u00f3 \u00f4ng n\u00e0o vi\u1ebft th\u00eam m\u1ed9t ch\u1ed7 dispatch trong transaction th\u00ec job v\u1eabn t\u1ef1 ch\u1edd, kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o tr\u00ed nh\u1edb c\u1ee7a ng\u01b0\u1eddi g\u1ecdi.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tuy nhi\u00ean c\u00e1ch n\u00e0y c\u0169ng c\u00f3 1 v\u1ea5n \u0111\u1ec1 v\u1ec1 timing. Laravel ch\u1edd transaction <strong>ngo\u00e0i c\u00f9ng<\/strong> commit, nested transaction ch\u1ec9 l\u00e0 savepoint. N\u00ean m\u1ed9t job b\u1ea1n t\u01b0\u1edfng b\u1eafn ra \u1edf gi\u1eefa flow gi\u1edd s\u1ebd x\u1ebfp h\u00e0ng ch\u1edd t\u1edbi cu\u1ed1i, sau c\u1ea3 c\u00e1i call payment gateway 800ms kia. V\u1edbi job g\u1eedi mail th\u00ec ch\u1eb3ng sao. V\u1edbi job c\u1ea7n \u0111\u1ed9 tr\u1ec5 th\u1ea5p, nh\u01b0 payment ch\u1eb3ng h\u1ea1n, th\u00ec b\u1ea1n v\u1eeba \u0111\u1ed5i m\u1ed9t bug l\u1ea5y m\u1ed9t c\u00e1i ch\u1eadm.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">V\u1eady b\u00e0i h\u1ecdc sau bu\u1ed5i s\u00e1ng v\u00e0 c\u1ed1c cafe ngu\u1ed9i ng\u1eaft l\u00e0 g\u00ec?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Project m\u1edbi: <code>after_commit =&gt; true<\/code> cho m\u1ecdi connection, ngay ng\u00e0y \u0111\u1ea7u, tr\u01b0\u1edbc khi c\u00f3 ai k\u1ecbp dispatch c\u00e1i g\u00ec. Chi ph\u00ed g\u1ea7n b\u1eb1ng kh\u00f4ng v\u00ec ch\u01b0a c\u00f3 code n\u00e0o d\u1ef1a v\u00e0o h\u00e0nh vi c\u0169.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Project c\u0169: \u0111\u1eebng b\u1eadt global r\u1ed3i deploy chi\u1ec1u th\u1ee9 s\u00e1u \ud83d\ude42 Grep h\u1ebft ch\u1ed7 n\u00e0o <code>dispatch<\/code>, <code>event(<\/code>, <code>notify(<\/code> n\u1eb1m trong <code>DB::transaction<\/code>, xem job n\u00e0o ch\u1ea5p nh\u1eadn b\u1ecb b\u1ecf khi rollback, job n\u00e0o kh\u00f4ng. B\u1eadt t\u1eebng class b\u1eb1ng <code>ShouldQueueAfterCommit<\/code> tr\u01b0\u1edbc, b\u1eadt global sau khi \u0111\u00e3 th\u1ea5y \u0111\u1ee7.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">V\u00e0 c\u00e1i t\u00f4i note cho c\u00e1c b\u1ea1n, kh\u00f4ng li\u00ean quan t\u1edbi queue: k\u00e9o call payment gateway (external outbound call) ra kh\u1ecfi transaction. Gi\u1eef transaction ch\u1ec9 c\u00f2n insert order v\u00e0 items, v\u00e0i ms l\u00e0 xong. \u0110\u00e2y m\u1edbi l\u00e0 th\u1ee9 thu h\u1eb9p c\u00e1i c\u1eeda s\u1ed5 race v\u1ec1 g\u1ea7n kh\u00f4ng, c\u00f2n <code>after_commit<\/code> l\u00e0 l\u01b0\u1edbi an to\u00e0n cho l\u00fac m\u00ecnh qu\u00ean.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu anh em c\u00f3 ca n\u00e0o <code>after_commit<\/code> l\u00e0m h\u1ecfng th\u1ee9 kh\u00e1c trong project c\u1ee7a b\u1ea1n, k\u1ec3 t\u00f4i nghe v\u1edbi. 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