cewood commented on a change in pull request #6496: [FLINK-10063][tests] Use
runit to supervise mesos processes.
URL: https://github.com/apache/flink/pull/6496#discussion_r207793002
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File path: flink-jepsen/src/jepsen/flink/mesos.clj
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@@ -24,11 +24,35 @@
[jepsen.os.debian :as debian]
[jepsen.flink.zookeeper :refer [zookeeper-uri]]))
+;;; runit process supervisor (http://smarden.org/runit/)
+;;;
+;;; We use runit to supervise Mesos processes because Mesos uses a "fail-fast"
approach to
+;;; error handling, e.g., the Mesos master will exit when it discovers it has
been partitioned away
+;;; from the Zookeeper quorum.
+
+(def runit-version "2.1.2-3")
+
+(defn create-supervised-service!
+ "Registers a service with the process supervisor and starts it."
+ [service-name cmd]
+ (let [service-dir (str "/etc/sv/" service-name)
+ run-script (str service-dir "/run")]
+ (c/su
+ (c/exec :mkdir :-p service-dir)
+ (c/exec :echo (clojure.string/join "\n" ["#!/bin/sh" cmd]) :> run-script)
Review comment:
It's generally considered best practice for runit units to include an `exec
2>&1` line, and to prefix your command with `exec ...`. So I'd suggest updating
this line accordingly; `["#!/bin/sh" "exec 2>&1" (str "exec " cmd)]`
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