* client/executor: refactor client to remove interpolation
* executor: POC libcontainer based executor
* vendor: use hashicorp libcontainer fork
* vendor: add libcontainer/nsenter dep
* executor: updated executor interface to simplify operations
* executor: implement logging pipe
* logmon: new logmon plugin to manage task logs
* driver/executor: use logmon for log management
* executor: fix tests and windows build
* executor: fix logging key names
* executor: fix test failures
* executor: add config field to toggle between using libcontainer and standard executors
* logmon: use discover utility to discover nomad executable
* executor: only call libcontainer-shim on main in linux
* logmon: use seperate path configs for stdout/stderr fifos
* executor: windows fixes
* executor: created reusable pid stats collection utility that can be used in an executor
* executor: update fifo.Open calls
* executor: fix build
* remove executor from docker driver
* executor: Shutdown func to kill and cleanup executor and its children
* executor: move linux specific universal executor funcs to seperate file
* move logmon initialization to a task runner hook
* client: doc fixes and renaming from code review
* taskrunner: use shared config struct for logmon fifo fields
* taskrunner: logmon only needs to be started once per task
In case where gelf/json logging is used, its fairly easy to exceed the 16k limit, resulting in json output being cut up into multiple strings
the result is invalid json lines which can create all kind of badness in the logging server
This fixes https://github.com/hashicorp/nomad/issues/4699
Signed-off-by: Christian Winther <jippignu@gmail.com>
We attempt to avoid splitting a log line between two files by detecting
if we are near the file size limit and scanning for new lines and only
flushing those.
BenchmarkRotator/1KB-8 300000 5613 ns/op
BenchmarkRotator/2KB-8 200000 8384 ns/op
BenchmarkRotator/4KB-8 100000 14604 ns/op
BenchmarkRotator/8KB-8 50000 25002 ns/op
BenchmarkRotator/16KB-8 30000 47572 ns/op
BenchmarkRotator/32KB-8 20000 92080 ns/op
BenchmarkRotator/64KB-8 10000 165883 ns/op
BenchmarkRotator/128KB-8 5000 294405 ns/op
BenchmarkRotator/256KB-8 2000 572374 ns/op
Nick Ethier