Brian Goff ab16b6c61a Fix issues with tailing rotated jsonlog file ...

Fixes a race where the log reader would get events for both an actual
rotation as we from fsnotify (`fsnotify.Rename`).
This issue becomes extremely apparent when rotations are fast, for
example:

```
$ docker run -d --name test --log-opt max-size=1 --log-opt max-file=2
busybox sh -c 'while true; do echo hello; usleep 100000; done'
```

With this change the log reader for jsonlogs can handle rotations that
happen as above.

Instead of listening for both fs events AND rotation events
simultaneously, potentially meaning we see 2 rotations for only a single
rotation due to channel buffering, only listen for fs events (like
`Rename`) and then wait to be notified about rotation by the logger.
This makes sure that we don't see 2 rotations for 1, and that we don't
start trying to read until the logger is actually ready for us to.

Signed-off-by: Brian Goff <cpuguy83@gmail.com>
Upstream-commit: 84e60a7e10278e3acd2b783d0e6955dc5198b57c
Component: engine

2016-08-15 13:57:28 -04:00

components/engine

Fix issues with tailing rotated jsonlog file

2016-08-15 13:57:28 -04:00

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