When writing a file to the namespace, NFS can cause a flush at any time and never issue a close. After each flush or write, HCP waits a short amount of time for the next one. If no write occurs within that time, HCP considers the resulting object to be complete and automatically closes it. This event is called lazy close.
If you set retention on an object during the lazy close period, HCP closes the object immediately. The object becomes WORM, and retention applies, even if the object contains no data. However, if the directory that contains the object and its corresponding metadirectory are mounted on two different nodes in the HCP system, setting retention during the lazy close period does not close the object.