From 2d70cc532c347b01cc617ef2787399817d9df651 Mon Sep 17 00:00:00 2001
From: Yingchun Lai <405403881@qq.com>
Date: Mon, 1 Feb 2021 00:11:29 +0800
Subject: [PATCH] [Bug] Fix CompactionPermitLimiter cv starve bug (#5274)

Fix _permits_cv.wait maybe starve to death bug.
---
 be/src/olap/compaction_permit_limiter.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/be/src/olap/compaction_permit_limiter.cpp b/be/src/olap/compaction_permit_limiter.cpp
index b675cf89f42fd9..3e159722434f97 100644
--- a/be/src/olap/compaction_permit_limiter.cpp
+++ b/be/src/olap/compaction_permit_limiter.cpp
@@ -47,6 +47,7 @@ bool CompactionPermitLimiter::request(int64_t permits) {
 }
 
 void CompactionPermitLimiter::release(int64_t permits) {
+    std::unique_lock<std::mutex> lock(_permits_mutex);
     _used_permits -= permits;
     _permits_cv.notify_one();
     DorisMetrics::instance()->compaction_used_permits->set_value(_used_permits);