He Xiaoqiao ab451b8e42 HDFS-15651. Client could not obtain block when DN CommandProcessingThread exit. Contributed by Aiphago.
Reviewed-by: He Xiaoqiao <hexiaoqiao@apache.org>
Reviewed-by: Yiqun Lin <yqlin@apache.org>
(cherry picked from commit 3067a25fa12a012709f43aa35cc606db6fb137f9)

 Conflicts:
	hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestBPOfferService.java
2021-03-30 22:29:49 +08:00
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