Why do we have checkPointCopy in ControlFileData?

From: Jialun Zhang <reatank(at)gmail(dot)com>
To: pgsql-novice(at)lists(dot)postgresql(dot)org
Subject: Why do we have checkPointCopy in ControlFileData?
Date: 2020-07-03 19:12:08
Message-ID: CAMFL+JjujGH6XbgDkvnRN5dVsMqYjjnN2k71vzcQE=0THFvEAA@mail.gmail.com
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Hi All,

I am reading the code about checkpoint, I think ControlFileData::checkPoint
in pg_control.h is the last checkpoint, so why is there also a checkPointCopy?
What is its role?

Thanks,
Reatank

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