cluster: add worker_boot_timeout option

When your workers are loading, the normal operation timeout is in
effect. If you spawn many workers or have them perform a lot of work
or wait for just long enough before actually booting, they will be
killed by the worker ping timeout.

If you want to control the exact timeout for your workers to boot,
specify the `worker_boot_timeout` option. Otherwise, it defaults to
the value of the `worker_timeout` option.

examples/config.rb

@@ -149,6 +149,12 @@
 #
 # worker_timeout 60
 
+# Change the default worker timeout for booting
+#
+# If unspecified, this defaults to the value of worker_timeout.
+#
+# worker_boot_timeout 60
+
 # === Puma control rack application ===
 
 # Start the puma control rack application on "url". This application can

lib/puma/cluster.rb

@@ -136,6 +136,7 @@ module Puma
       any = false
 
       @workers.each do |w|
+        next if !w.booted? && !w.ping_timeout?(@options[:worker_boot_timeout])
         if w.ping_timeout?(@options[:worker_timeout])
           log "! Terminating timed out worker: #{w.pid}"
           w.kill

lib/puma/configuration.rb

@@ -27,6 +27,7 @@ module Puma
       @conf[:before_worker_fork] ||= []
       @conf[:after_worker_boot] ||= []
       @conf[:worker_timeout] ||= DefaultWorkerTimeout
+      @conf[:worker_boot_timeout] ||= @conf[:worker_timeout]
       @conf[:worker_shutdown_timeout] ||= DefaultWorkerShutdownTimeout
 
       @options = {}

lib/puma/dsl.rb

@@ -261,6 +261,11 @@ module Puma
       @options[:worker_timeout] = timeout
     end
 
+    # *Cluster mode only* Set the timeout for workers to boot
+    def worker_boot_timeout(timeout)
+      @options[:worker_boot_timeout] = timeout
+    end
+
     # *Cluster mode only* Set the timeout for worker shutdown
     def worker_shutdown_timeout(timeout)
       @options[:worker_shutdown_timeout] = timeout