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fn: hot container timer improvements (#751)

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* fn: hot container timer improvements

With this change, now we are allocating the timers
when the container starts and managing them via
stop/clear as needed, which should not only be more
efficient, but also easier to follow.

For example, previously, if eject time out was
set to 10 secs, this could have delayed idle timeout
up to 10 secs as well. It is also not necessary to do
any math for elapsed time.

Now consumers avoid any requeuing when startDequeuer() is cancelled.
This was triggering additional dequeue/requeue causing
containers to wake up spuriously. Also in startDequeuer(),
we no longer remove the item from the actual queue and
leave this to acquire/eject, which side steps issues related
with item landing in the channel, not consumed, etc.
This commit is contained in:
Tolga Ceylan
2018-02-12 14:12:03 -08:00
committed by GitHub
parent ffcda9b823
commit c848fc6181
4 changed files with 191 additions and 241 deletions
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docs/operating/options.md
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@@ -30,7 +30,7 @@ docker run -e VAR_NAME=VALUE ...
| `FN_LOG_PREFIX` | If supplying a syslog url in `FN_LOG_DEST`, a prefix to add to each log line
| `FN_API_CORS` | A comma separated list of URLs to enable [CORS](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS) for (or `*` for all domains). This corresponds to the allowed origins in the `Acccess-Control-Allow-Origin` header. | None |
| `FN_FREEZE_IDLE_MSECS` | Set this option to specify the amount of time to wait in milliseconds before pausing/freezing an idle hot container. Set to 0 to freeze idle containers without any delay. Set to negative integer to disable freeze/pause of idle hot containers. | 50 |
`FN_EJECT_IDLE_MSECS` | Set this option to specify the amount of time to wait in milliseconds before attempting to terminate an idle hot container when the system is starved for CPU and Memory resources. Set to negative integer to disable this feature. | 1000 |
`FN_EJECT_IDLE_MSECS` | Set this option to specify the amount of time in milliseconds to periodically check to terminate an idle hot container if the system is starved for CPU and Memory resources. Set to negative integer to disable this feature. | 1000 |
| `DOCKER_HOST` | Docker remote API URL. | /var/run/docker.sock |
| `DOCKER_API_VERSION` | Docker remote API version. | 1.24 |
| `DOCKER_TLS_VERIFY` | Set this option to enable/disable Docker remote API over TLS/SSL. | 0 |