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From Alexander Rukletsov <ruklet...@gmail.com>
Subject Re: Review Request 46325: Updated HTTP command executor to support kill policy in Kill event.
Date Fri, 22 Apr 2016 14:45:35 GMT


> On April 21, 2016, 9:56 p.m., Ben Mahler wrote:
> > src/launcher/http_command_executor.cpp, lines 172-176
> > <https://reviews.apache.org/r/46325/diff/3/?file=1355102#file1355102line172>
> >
> >     Wrap at the paren:
> >     
> >     ```
> >               kill(event.kill().task_id(),
> >                    event.kill().has_kill_policy()
> >                      ? Option<KillPolicy>(event.kill().kill_policy())
> >                      : None());
> >     ```
> >     
> >     Any way to avoid the explicit Option construction? Does this compile?
> >     
> >     ```
> >               kill(event.kill().task_id(),
> >                    event.kill().has_kill_policy()
> >                     ? Some(event.kill().kill_policy())
> >                     : None());
> >     ```
> >     
> >     If not, consider pulling out the kill policy as an option variable.

Unfortunately, `Some(event.kill().kill_policy())` does not compile. Passing `Event::Kill`
seems unfortunate as well: if we want to call `kill()` from another place in the code, we
have to prepare the proto message. I'll go with a local variable.


> On April 21, 2016, 9:56 p.m., Ben Mahler wrote:
> > src/launcher/http_command_executor.cpp, line 665
> > <https://reviews.apache.org/r/46325/diff/3/?file=1355102#file1355102line665>
> >
> >     Leaving this unimplemented as a TODO seems to have implications on the documentation
in your previous patch:
> >     
> >     https://reviews.apache.org/r/46322/
> >     
> >     It seems like all you would need to do to implement the TODO is to remove this
if condition and make the logging more clear? Otherwise, if you leave this out we really need
to document it within the Kill Call. My hunch is that in writing that documentation we'll
realize we should just do an override always.

Yeah, we can remove the check.


- Alexander


-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/46325/#review129937
-----------------------------------------------------------


On April 21, 2016, 2:28 p.m., Alexander Rukletsov wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/46325/
> -----------------------------------------------------------
> 
> (Updated April 21, 2016, 2:28 p.m.)
> 
> 
> Review request for mesos, Ben Mahler and Qian Zhang.
> 
> 
> Bugs: MESOS-4908
>     https://issues.apache.org/jira/browse/MESOS-4908
> 
> 
> Repository: mesos
> 
> 
> Description
> -------
> 
> Kill policy can be provided in a kill event. In this case it should
> take precedence over kill policy specified when the task was launched.
> When kill event is issued multiple times during the task termination,
> the signal escalation timeout (the time a task has between SIGTERM
> and SIGKILL) may be reduced.
> 
> Since updating the delay timer (we use it for signal escalation delay)
> is currently not possible, we cancel the existing signal timer and set
> up a new one. `Clock::cancel()` guarantees that, if existed, the timer
> is removed before the function returns; hence we do not set up more
> than 1 timer for signal escalation delay.
> 
> 
> Diffs
> -----
> 
>   src/launcher/http_command_executor.cpp 9dfe48108cababeb2d4a6af74434880d79245c21 
> 
> Diff: https://reviews.apache.org/r/46325/diff/
> 
> 
> Testing
> -------
> 
> `make check`
> 
> Tested manually using modified `mesos-execute` in a way that **two** extra kill task
requests are sent, 2s and 3s after receiving `TASK_RUNNING`. Each kill task request specifies
`KillPolicy` with 1s grace period. Together with a kill *without* a kill policy scheduled
1s after the task is being launched, the task receives **three** kill requests in total.
> 
> Master: `./bin/mesos-master.sh --work_dir=/tmp/w/m --ip=127.0.0.1`
> Agent: `./bin/mesos-slave.sh --work_dir=/tmp/w/s --master=127.0.0.1:5050 --http_command_executor`
> Mesos-execute: `./src/mesos-execute --master=127.0.0.1:5050 --name=test --command="/Users/alex/bin/unresponsive_process"
--env='{"GLOG_v": "2"}' --kill_after=1secs`
> 
> HTTP command executor log:
> ```
> Received SUBSCRIBED event
> Subscribed executor on alexr.fritz.box
> Received LAUNCH event
> Starting task test
> sh -c '/Users/alex/bin/unresponsive_process'
> Forked command at 17475
> 14455919081943275466
> Received ACKNOWLEDGED event
> 17172602460659762152
> Received KILL event
> Received kill for task test
> Sending SIGTERM to process tree at pid 17475
> Sent SIGTERM to the following process trees:
> [ 
> --- 17475 /Users/alex/bin/unresponsive_process
> ]
> 4381544758593790168
> Scheduling escalation to SIGKILL in 3secs from now
> Received ACKNOWLEDGED event
> Received KILL event
> Received kill for task test
> Rescheduling escalation to SIGKILL in 1secs from now
> 10370891801885978953
> Process 17475 did not terminate after 1secs, sending SIGKILL to process tree at 17475
> Killed the following process trees:
> [ 
> --- 17475 /Users/alex/bin/unresponsive_process
> ]
> Received KILL event
> Received kill for task test
> Command terminated with signal Killed: 9 (pid: 17475)
> ```
> 
> Excerpt from the agent log that shows all 3 kill task requests and that the segnal escalation
timeout was reduced from 3s to 1s:
> ```
> I0418 14:27:17.825070 244285440 slave.cpp:3605] Forwarding the update TASK_RUNNING (UUID:
925e2d89-f6eb-464d-9a50-a74a8e07bc88) for task test of framework ab374773-a018-4531-923b-899cf1e4f573-0000
to master@127.0.0.1:5050
> I0418 14:27:17.831233 242139136 status_update_manager.cpp:392] Received status update
acknowledgement (UUID: 925e2d89-f6eb-464d-9a50-a74a8e07bc88) for task test of framework ab374773-a018-4531-923b-899cf1e4f573-0000
> I0418 14:27:18.834309 244285440 slave.cpp:2046] Asked to kill task test of framework
ab374773-a018-4531-923b-899cf1e4f573-0000
> I0418 14:27:18.842150 244285440 http.cpp:178] HTTP POST for /slave(1)/api/v1/executor
from 192.168.178.24:54206
> I0418 14:27:18.842331 244285440 slave.cpp:3207] Handling status update TASK_KILLING (UUID:
a2f6eca7-b3e5-4e45-adcb-356f75355563) for task test of framework ab374773-a018-4531-923b-899cf1e4f573-0000
> I0418 14:27:18.843214 242139136 status_update_manager.cpp:320] Received status update
TASK_KILLING (UUID: a2f6eca7-b3e5-4e45-adcb-356f75355563) for task test of framework ab374773-a018-4531-923b-899cf1e4f573-0000
> I0418 14:27:18.843387 243748864 slave.cpp:3605] Forwarding the update TASK_KILLING (UUID:
a2f6eca7-b3e5-4e45-adcb-356f75355563) for task test of framework ab374773-a018-4531-923b-899cf1e4f573-0000
to master@127.0.0.1:5050
> I0418 14:27:18.846459 242675712 status_update_manager.cpp:392] Received status update
acknowledgement (UUID: a2f6eca7-b3e5-4e45-adcb-356f75355563) for task test of framework ab374773-a018-4531-923b-899cf1e4f573-0000
> I0418 14:27:19.836699 240529408 slave.cpp:2046] Asked to kill task test of framework
ab374773-a018-4531-923b-899cf1e4f573-0000
> I0418 14:27:20.850658 240529408 slave.cpp:2046] Asked to kill task test of framework
ab374773-a018-4531-923b-899cf1e4f573-0000
> I0418 14:27:20.927338 241602560 http.cpp:178] HTTP POST for /slave(1)/api/v1/executor
from 192.168.178.24:54206
> I0418 14:27:20.927465 241602560 slave.cpp:3207] Handling status update TASK_KILLED (UUID:
fdcb43ec-271b-4976-aaf3-59a031cdc924) for task test of framework ab374773-a018-4531-923b-899cf1e4f573-0000
> I0418 14:27:20.928771 240529408 status_update_manager.cpp:320] Received status update
TASK_KILLED (UUID: fdcb43ec-271b-4976-aaf3-59a031cdc924) for task test of framework ab374773-a018-4531-923b-899cf1e4f573-0000
> I0418 14:27:20.928933 243748864 slave.cpp:3605] Forwarding the update TASK_KILLED (UUID:
fdcb43ec-271b-4976-aaf3-59a031cdc924) for task test of framework ab374773-a018-4531-923b-899cf1e4f573-0000
to master@127.0.0.1:5050
> 
> ```
> 
> 
> Thanks,
> 
> Alexander Rukletsov
> 
>


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