Is this a BUG REPORT or FEATURE REQUEST?:

Uncomment only one, leave it on its own line:

• bug

• feature

What happened:
synchronous_commit设置为off时，持续给主机进行插入事务，事务间隔性阻塞1-2s

What you expected to happen:
synchronous_commit设置为off时，持续给主机进行插入事务，主机事务不阻塞

How to reproduce it (as minimally and precisely as possible):
1、设置synchronous_commit参数为0ff；2、持续插入事务

Anything else we need to know?:

Environment:

• Version:330补丁包
• OS (e.g. from /etc/os-release):
• Kernel (e.g. uname -a):
• Install tools:
• Others: