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

  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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