Latest revision as of 02:55, 24 September 2016
One such property that deserves a special item in this list is
file system journal. While journal is a good thing to have, because
it helps to maintain file system integrity and improve reboot times
(by eliminating fsck in many cases), it is also a bottleneck for
containers. If one container will fill up in-memory journal (with
lots of small operations leading to file metadata updates, e.g.
file truncates), all the other containers I/O will block waiting
for the journal to be written to disk. In some extreme cases we saw
up to 15 seconds of such blockage.
