minor cleanups and doc fixes for 6.0

lib/sidekiq/api.rb

@@ -713,7 +713,7 @@ module Sidekiq
 
   ##
   # Enumerates the set of Sidekiq processes which are actively working
-  # right now.  Each process send a heartbeat to Redis every 5 seconds
+  # right now.  Each process sends a heartbeat to Redis every 5 seconds
   # so this set should be relatively accurate, barring network partitions.
   #
   # Yields a Sidekiq::Process.

lib/sidekiq/cli.rb

@@ -56,8 +56,7 @@ module Sidekiq
       # touch the connection pool so it is created before we
       # fire startup and start multithreading.
       ver = Sidekiq.redis_info["redis_version"]
-      raise "You are using Redis v#{ver}, Sidekiq requires Redis v2.8.0 or greater" if ver < "2.8"
-      logger.warn "Sidekiq 6.0 requires Redis 4.0+, you are using Redis v#{ver}" if ver < "4"
+      raise "You are using Redis v#{ver}, Sidekiq requires Redis v4.0.0 or greater" if ver < "4"
 
       # Since the user can pass us a connection pool explicitly in the initializer, we
       # need to verify the size is large enough or else Sidekiq's performance is dramatically slowed.
@@ -98,9 +97,13 @@ module Sidekiq
       rescue Interrupt
         logger.info "Shutting down"
         launcher.stop
-        # Explicitly exit so busy Processor threads can't block
-        # process shutdown.
         logger.info "Bye!"
+
+        # Explicitly exit so busy Processor threads won't block process shutdown.
+        #
+        # NB: slow at_exit handlers will prevent a timely exit if they take
+        # a while to run. If Sidekiq is getting here but the process isn't exiting,
+        # use the TTIN signal to determine where things are stuck.
         exit(0)
       end
     end
@@ -266,7 +269,7 @@ module Sidekiq
       if !File.exist?(options[:require]) ||
           (File.directory?(options[:require]) && !File.exist?("#{options[:require]}/config/application.rb"))
         logger.info "=================================================================="
-        logger.info "  Please point sidekiq to a Rails 4/5 application or a Ruby file  "
+        logger.info "  Please point Sidekiq to a Rails application or a Ruby file  "
         logger.info "  to load your worker classes with -r [DIR|FILE]."
         logger.info "=================================================================="
         logger.info @parser
@@ -287,7 +290,7 @@ module Sidekiq
         end
 
         o.on "-d", "--daemon", "Daemonize process" do |arg|
-          puts "WARNING: Daemonization mode was removed in Sidekiq 6.0, please use a proper process supervisor to start and manage your services"
+          puts "ERROR: Daemonization mode was removed in Sidekiq 6.0, please use a proper process supervisor to start and manage your services"
         end
 
         o.on "-e", "--environment ENV", "Application environment" do |arg|
@@ -320,11 +323,11 @@ module Sidekiq
         end
 
         o.on "-L", "--logfile PATH", "path to writable logfile" do |arg|
-          puts "WARNING: Logfile redirection was removed in Sidekiq 6.0, Sidekiq will only log to STDOUT"
+          puts "ERROR: Logfile redirection was removed in Sidekiq 6.0, Sidekiq will only log to STDOUT"
         end
 
         o.on "-P", "--pidfile PATH", "path to pidfile" do |arg|
-          puts "WARNING: PID file creation was removed in Sidekiq 6.0, please use a proper process supervisor to start and manage your services"
+          puts "ERROR: PID file creation was removed in Sidekiq 6.0, please use a proper process supervisor to start and manage your services"
         end
 
         o.on "-V", "--version", "Print version and exit" do |arg|
@@ -360,12 +363,6 @@ module Sidekiq
       opts = opts.merge(opts.delete(environment.to_sym) || {})
       parse_queues(opts, opts.delete(:queues) || [])
 
-      ns = opts.delete(:namespace)
-      if ns
-        # logger hasn't been initialized yet, puts is all we have.
-        puts("namespace should be set in your ruby initializer, is ignored in config file")
-        puts("config.redis = { :url => ..., :namespace => '#{ns}' }")
-      end
       opts
     end
 

lib/sidekiq/launcher.rb

@@ -5,10 +5,7 @@ require "sidekiq/fetch"
 require "sidekiq/scheduled"
 
 module Sidekiq
-  # The Launcher is a very simple Actor whose job is to
-  # start, monitor and stop the core Actors in Sidekiq.
-  # If any of these actors die, the Sidekiq process exits
-  # immediately.
+  # The Launcher starts the Manager and Poller threads and provides the process heartbeat.
   class Launcher
     include Util
 

lib/sidekiq/redis_connection.rb

@@ -124,8 +124,8 @@ module Sidekiq
             REDIS_PROVIDER should be set to the name of the variable which contains the Redis URL, not a URL itself.
             Platforms like Heroku will sell addons that publish a *_URL variable.  You need to tell Sidekiq with REDIS_PROVIDER, e.g.:
 
-            REDIS_PROVIDER=REDISTOGO_URL
             REDISTOGO_URL=redis://somehost.example.com:6379/4
+            REDIS_PROVIDER=REDISTOGO_URL
           EOM
         end
 

lib/sidekiq/worker.rb

@@ -39,8 +39,9 @@ module Sidekiq
         # Allows customization for this type of Worker.
         # Legal options:
         #
-        #   retry - enable the RetryJobs middleware for this Worker, *true* to use the default
-        #      or *Integer* count
+        #   queue - name of queue to use for this job type, default *default*
+        #   retry - enable retries for this Worker in case of error during execution,
+        #      *true* to use the default or *Integer* count
         #   backtrace - whether to save any error backtrace in the retry payload to display in web UI,
         #      can be true, false or an integer number of lines to save, default *false*
         #