Merge pull request #119 from Watson1978/fix-memory-usage

Fix memory usage

Author: kenhys

fluent-plugin-systemd.gemspec

@@ -24,5 +24,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rubocop', '1.13.0'
 
   spec.add_runtime_dependency 'fluentd', ['>= 0.14.11', '< 2']
-  spec.add_runtime_dependency 'systemd-journal', '~> 2.0.0'
+  spec.add_runtime_dependency 'systemd-journal', '~> 2.1.0'
 end

lib/fluent/plugin/in_systemd.rb

@@ -75,7 +75,7 @@ def shutdown
       def init_journal
         # TODO: ruby 2.3
         @journal.close if @journal # rubocop:disable Style/SafeNavigation
-        @journal = Systemd::Journal.new(path: @path)
+        @journal = Systemd::Journal.new(path: @path, auto_reopen: true)
         @journal.filter(*(@matches || @filters))
         seek
         true