From 64e6a9800a38ceb3e57f2f9f360b7212c2cc61c2 Mon Sep 17 00:00:00 2001
From: Joe Zhou <zhoushuqun@gmail.com>
Date: Thu, 24 Nov 2022 00:26:09 +0800
Subject: [PATCH] Add dead-lock note for QueueScheduler.

---
 .../java/us/codecraft/webmagic/scheduler/QueueScheduler.java | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/webmagic-core/src/main/java/us/codecraft/webmagic/scheduler/QueueScheduler.java b/webmagic-core/src/main/java/us/codecraft/webmagic/scheduler/QueueScheduler.java
index 04d5b36..19d3bc7 100644
--- a/webmagic-core/src/main/java/us/codecraft/webmagic/scheduler/QueueScheduler.java
+++ b/webmagic-core/src/main/java/us/codecraft/webmagic/scheduler/QueueScheduler.java
@@ -4,12 +4,17 @@ import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.LinkedBlockingQueue;
 
 import us.codecraft.webmagic.Request;
+import us.codecraft.webmagic.Site;
 import us.codecraft.webmagic.Task;
 
 /**
  * Basic Scheduler implementation.<br>
  * Store urls to fetch in LinkedBlockingQueue and remove duplicate urls by HashMap.
  *
+ * Note: if you use this {@link QueueScheduler}
+ * with {@link Site#getCycleRetryTimes()} enabled, you may encountered dead-lock
+ * when the queue is full.
+ *
  * @author code4crafter@gmail.com <br>
  * @since 0.1.0
  */