+ * Looks like an xlog file. Parse it's position.
+ if (sscanf(dirent->d_name, "%08X%08X%08X", &tli, &log, &seg) !=
+ fprintf(stderr, _("%s: could not parse xlog filename
+ progname, dirent->d_name);
+ log *= XLOG_SEG_SIZE;
That multiplication by XLOG_SEG_SIZE could overflow, if logid is very
high. It seems completely unnecessary, anyway,
s/IDENFITY_SYSTEM/IDENTIFY_SYSTEM/ (two occurrences)
In pg_basebackup, it would be a good sanity check to check that the
systemid returned by IDENTIFY_SYSTEM in the main connection and the
WAL-streaming connection match. Just to be sure that some connection
pooler didn't hijack one of the connections and point to a different
server. And better check timelineid too while you're at it.
How does this interact with synchronous replication? If a base backup
that streams WAL is in progress, and you have synchronous_standby_names
set to '*', I believe the in-progress backup will count as a standby for
that purpose. That might give a false sense of security.
synchronous_standby_names='*' is prone to such confusion in general, but
it seems that it's particularly surprising if a running pg_basebackup
lets a commit in synchronous replication to proceed. Maybe we just need
a warning in the docs. I think we should advise that
synchronous_standby_names='*' is dangerous in general, and cite this as
one reason for that.
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