With several of our backups, as incrementals are applied, the materialized version uses a lot more disk space than it should:
$ sudo du -ma dbname
$ sudo du --apparent-size -ma dbname
The table1.ibd.delta files are less than 20 MB each, but after 7 incrementals, the disk usage of table1.idb has grown from 8349 MB to a whopping 16540 MB (but ls shows the expected 8808038400 bytes).
I think all of the bloated tables use TEXT, BLOB, or ROW_FORMAT=COMPRESSED. Is this a known issue?
I see it with Percona Server 5.5.25a - 5.5.28 and the current percona-xtrabackup 2.0.4.