Added useful comment to document how log tailing works.
@@ -782,6 +782,8 @@ perform_tail_follow (uint64_t * size1, const char *fn) {
size2 = file_size (fn);
/* file hasn't changed */
+ /* ###NOTE: This assumes the log file being read can be of less size, e.g.,
+ * rotated/truncated file or greater when data is appended */
if (size2 == *size1)
return;
