Guillaume ALAUX created ZOOKEEPER-2079:
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Summary: Stop daemon with "kill" rather than "kill -9"
Key: ZOOKEEPER-2079
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2079
Project: ZooKeeper
Issue Type: Improvement
Components: scripts
Environment: *nix
Reporter: Guillaume ALAUX
Priority: Minor
Script `zkServer.sh` stops zookeeper by sending the java process a `kill -9`
(SIGKILL). As there seems to be no technical reasons to use such a radical
signal rather than the default SIGTERM (-15), I would propose to just use
`kill` rather than `kill -9`.
My use case is for Systemd service files for Zookeeper which always consider
Zookeeper java process as failing when a clean `stop` is issued.
Systemd output showing this "fail":
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# sudo systemctl status zookeeper.service
● zookeeper.service - Highly reliable distributed coordination server
Loaded: loaded (/usr/lib/systemd/system/zookeeper.service; disabled)
Active: failed (Result: signal) since Wed 2014-11-05 11:23:29 CET; 2s ago
Process: 656 ExecStop=/usr/bin/zkServer.sh stop (code=exited,
status=0/SUCCESS)
Process: 406 ExecStart=/usr/bin/zkServer.sh start (code=exited,
status=0/SUCCESS)
Main PID: 414 (code=killed, signal=KILL)
Nov 05 11:23:29 magenta zookeeper[656]: Stopping zookeeper ... STOPPED
Nov 05 11:23:29 magenta systemd[1]: zookeeper.service: main process
exited, code=killed, status=9/KILL
Nov 05 11:23:29 magenta systemd[1]: Unit zookeeper.service entered failed state.
---------------8<---------------
There is no way to make this `status=9/KILL` to be recognized by
Systemd as a regular exit code, even with `SuccessExitStatus=9 KILL
SIGKILL`. On the other hand, turning this `kill -9` into a regular
`kill` (-15 implied) makes it:
---------------8<---------------
# sudo systemctl status zookeeper.service
● zookeeper.service - Highly reliable distributed coordination server
Loaded: loaded (/usr/lib/systemd/system/zookeeper.service; disabled)
Active: inactive (dead)
Nov 05 11:14:27 magenta zookeeper[30032]: Using config:
/usr/share/zookeeper/bin/../conf/zoo.cfg
Nov 05 11:14:27 magenta zookeeper[30032]: Stopping zookeeper ... STOPPED
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