Cluster: atomic update of nodes.conf file.
The way the file was generated was unsafe and leaded to nodes.conf file corruption (zero length file) on server stop/crash during the creation of the file. The previous file update method was as simple as open with O_TRUNC followed by the write call. While the write call was a single one with the full payload, ensuring no half-written files for POSIX semantics, stopping the server just after the open call resulted into a zero-length file (all the nodes information lost!).
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