Class: Process::Naf::Runner
- Inherits:
-
Af::Application
- Object
- Af::Application
- Process::Naf::Runner
- Defined in:
- app/models/process/naf/runner.rb
Instance Attribute Summary collapse
-
#current_invocation ⇒ Object
Returns the value of attribute current_invocation.
-
#machine ⇒ Object
Returns the value of attribute machine.
Instance Method Summary collapse
- #assigned_jobs(record) ⇒ Object
-
#check_dead_children_not_exited_properly ⇒ Object
XXX is there a race condition where a child process exits XXX has not set pid or status yet and timeout fires? XXX i bet there is XXX so this code is here:.
- #check_gc_configurations ⇒ Object
- #check_log_level ⇒ Object
- #check_schedules ⇒ Object
- #cleanup_dead_child(pid, status) ⇒ Object
- #cleanup_dead_children ⇒ Object
- #cleanup_old_processes ⇒ Object
-
#emergency_teardown ⇒ Object
kill(0, pid) seems to fail during at_exit block so this shoots from the hip.
- #escape_html(str) ⇒ Object
- #finish_job(running_job, updates = {}) ⇒ Object
-
#initialize ⇒ Runner
constructor
A new instance of Runner.
- #is_job_process_alive?(job) ⇒ Boolean
- #log_output_until_job_finishes(job_id, stdout, stderr) ⇒ Object
- #memory_available_to_spawn? ⇒ Boolean
- #retrieve_invocation_information ⇒ Object
- #send_signal_and_maybe_clean_up(job, signal) ⇒ Object
- #should_be_queued ⇒ Object
- #start_new_jobs ⇒ Object
- #terminate_old_processes(record) ⇒ Object
-
#update_historical_job(updates, historical_job_id) ⇒ Object
XXX update_all doesn’t support “from_partition” so we have this helper.
- #wind_down_runners ⇒ Object
- #work ⇒ Object
- #work_machine ⇒ Object
- #work_machine_loop ⇒ Object
Constructor Details
#initialize ⇒ Runner
Returns a new instance of Runner.
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# File 'app/models/process/naf/runner.rb', line 51 def initialize super opt :log_configuration_files, default: ["af.yml", "af-#{Rails.env}.yml", "naf.yml", "naf-#{Rails.env}.yml", "nafrunner.yml", "nafrunner-#{Rails.env}.yml", "#{af_name}.yml", "#{af_name}-#{Rails.env}.yml"] @last_machine_log_level = nil end |
Instance Attribute Details
#current_invocation ⇒ Object
Returns the value of attribute current_invocation.
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# File 'app/models/process/naf/runner.rb', line 6 def current_invocation @current_invocation end |
#machine ⇒ Object
Returns the value of attribute machine.
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# File 'app/models/process/naf/runner.rb', line 6 def machine @machine end |
Instance Method Details
#assigned_jobs(record) ⇒ Object
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# File 'app/models/process/naf/runner.rb', line 590 def assigned_jobs(record) if record.kind_of? ::Naf::MachineRunnerInvocation return ::Naf::RunningJob.started_on_invocation(record.id).select do |job| is_job_process_alive?(job) end else return ::Naf::RunningJob.assigned_jobs(record).select do |job| is_job_process_alive?(job) end end end |
#check_dead_children_not_exited_properly ⇒ Object
XXX is there a race condition where a child process exits XXX has not set pid or status yet and timeout fires? XXX i bet there is XXX so this code is here:
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# File 'app/models/process/naf/runner.rb', line 321 def check_dead_children_not_exited_properly dead_children = [] @children.each do |pid, child| unless is_job_process_alive?(child.reload) dead_children << child end end unless dead_children.blank? logger.error escape_html("#{machine}: dead children even with timeout during waitpid2(): #{dead_children.inspect}") logger.warn "this isn't necessarily incorrect -- look for the pids to be cleaned up next round, if not: call it a bug" end end |
#check_gc_configurations ⇒ Object
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# File 'app/models/process/naf/runner.rb', line 103 def check_gc_configurations unless @disable_gc_modifications # These configuration changes will help forked processes, not the runner ENV['RUBY_HEAP_MIN_SLOTS'] = '500000' ENV['RUBY_HEAP_SLOTS_INCREMENT'] = '250000' ENV['RUBY_HEAP_SLOTS_GROWTH_FACTOR'] = '1' ENV['RUBY_GC_MALLOC_LIMIT'] = '50000000' end end |
#check_log_level ⇒ Object
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# File 'app/models/process/naf/runner.rb', line 229 def check_log_level if machine.log_level != @last_machine_log_level @last_machine_log_level = machine.log_level unless @last_machine_log_level.blank? logging_configurator.parse_and_set_logger_levels(@last_machine_log_level) end end end |
#check_schedules ⇒ Object
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# File 'app/models/process/naf/runner.rb', line 238 def check_schedules if ::Naf::Machine.is_it_time_to_check_schedules?(@check_schedules_period.minutes) logger.debug "it's time to check schedules" if ::Naf::ApplicationSchedule.try_lock_schedules logger.debug_gross "checking schedules" machine.mark_checked_schedule ::Naf::ApplicationSchedule.unlock_schedules # check scheduled tasks should_be_queued.each do |application_schedule| logger.info escape_html("scheduled application: #{application_schedule}") begin naf_boss = ::Logical::Naf::ConstructionZone::Boss.new # this doesn't work very well for run_group_limits in the thousands Range.new(0, application_schedule.application_run_group_limit || 1, true).each do naf_boss.enqueue_application_schedule(application_schedule) end rescue ::Naf::HistoricalJob::JobPrerequisiteLoop => jpl logger.error escape_html("#{machine} couldn't queue schedule because of prerequisite loop: #{jpl.}") logger.warn jpl application_schedule.enabled = false application_schedule.save! logger.alarm escape_html("Application Schedule disabled due to loop: #{application_schedule}") end end # check the runner machines ::Naf::Machine.enabled.up.each do |runner_to_check| if runner_to_check.is_stale?(@runner_stale_period.minutes) logger.alarm escape_html("runner is stale for #{@runner_stale_period} minutes, #{runner_to_check}") runner_to_check.mark_machine_down(machine) end end end end end |
#cleanup_dead_child(pid, status) ⇒ Object
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# File 'app/models/process/naf/runner.rb', line 335 def cleanup_dead_child(pid, status) child_job = @children.delete(pid) if child_job.present? # Update job tags child_job.([::Naf::HistoricalJob::SYSTEM_TAGS[:work]]) if status.nil? || status.exited? || status.signaled? logger.info { escape_html("cleaning up dead child: #{child_job.reload}") } finish_job(child_job, { exit_status: (status && status.exitstatus), termination_signal: (status && status.termsig) }) thread = @threads.delete(pid) logger.detail escape_html("cleaning up threads: #{thread.inspect}") logger.detail escape_html("thread list: #{Thread.list}") thread.join else # this can happen if the child is sigstopped logger.warn escape_html("child waited for did not exit: #{child_job}, status: #{status.inspect}") end else # XXX ERROR no child for returned pid -- this can't happen logger.warn "child pid: #{pid}, status: #{status.inspect}, not managed by this runner" end end |
#cleanup_dead_children ⇒ Object
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# File 'app/models/process/naf/runner.rb', line 275 def cleanup_dead_children # clean up children that have exited logger.detail "cleaning up dead children: #{@children.length}" if @children.length > 0 while @children.length > 0 pid = nil status = nil begin Timeout::timeout(@loop_sleep_time) do pid, status = Process.waitpid2(-1) end rescue Timeout::Error check_dead_children_not_exited_properly break rescue Errno::ECHILD => e logger.error escape_html("#{machine} No child when we thought we had children #{@children.inspect}") logger.warn e pid = @children.first.try(:first) status = nil logger.warn "pulling first child off list to clean it up: pid=#{pid}" end if pid begin cleanup_dead_child(pid, status) rescue ActiveRecord::ActiveRecordError => are logger.error escape_html("Failure during cleaning up of dead child with pid: #{pid}, status: #{status}") logger.error escape_html("#{are.}") rescue StandardError => e # XXX just incase a job control failure -- more code here logger.error "some failure during child clean up" logger.warn e end end end else logger.detail "sleeping in loop: #{@loop_sleep_time} seconds" sleep(@loop_sleep_time) end end |
#cleanup_old_processes ⇒ Object
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# File 'app/models/process/naf/runner.rb', line 113 def cleanup_old_processes machine.machine_runners.each do |runner| runner.machine_runner_invocations.recently_marked_dead(24.hours).each do |invocation| terminate_old_processes(invocation) end end end |
#emergency_teardown ⇒ Object
kill(0, pid) seems to fail during at_exit block so this shoots from the hip
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# File 'app/models/process/naf/runner.rb', line 494 def emergency_teardown return if @children.length == 0 logger.warn "emergency teardown of #{@children.length} job(s)" @children.clone.each do |pid, child| send_signal_and_maybe_clean_up(child, "TERM") end sleep(2) @children.clone.each do |pid, child| send_signal_and_maybe_clean_up(child, "KILL") # force job down finish_job(child) end end |
#escape_html(str) ⇒ Object
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# File 'app/models/process/naf/runner.rb', line 659 def escape_html(str) CGI::escapeHTML(str) end |
#finish_job(running_job, updates = {}) ⇒ Object
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# File 'app/models/process/naf/runner.rb', line 480 def finish_job(running_job, updates = {}) if running_job.present? running_job. running_job.([::Naf::HistoricalJob::SYSTEM_TAGS[:cleanup]]) end ::Naf::HistoricalJob.transaction do update_historical_job(updates.merge({ finished_at: Time.zone.now }), running_job.id) running_job.delete end end |
#is_job_process_alive?(job) ⇒ Boolean
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# File 'app/models/process/naf/runner.rb', line 586 def is_job_process_alive?(job) return send_signal_and_maybe_clean_up(job, 0) end |
#log_output_until_job_finishes(job_id, stdout, stderr) ⇒ Object
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# File 'app/models/process/naf/runner.rb', line 422 def log_output_until_job_finishes(job_id, stdout, stderr) log_file = ::Logical::Naf::LogFile.new("#{::Naf::PREFIX_PATH}/#{::Naf.schema_name}/jobs/#{job_id}") log_file.open # Continue reading logs from stdout/stderror until it reaches end of file while true read_pipes = [] read_pipes << stdout if stdout read_pipes << stderr if stderr return if (read_pipes.length == 0) error_pipes = read_pipes.clone read_array, write_array, error_array = Kernel.select(read_pipes, nil, error_pipes, 1) unless error_array.blank? logger.error escape_html("job(#{job_id}): select returned error for #{error_pipes.inspect} (read_pipes: #{read_pipes.inspect})") # XXX we should probably close the errored FDs end unless read_array.blank? begin for r in read_array do begin # Parse each log line into JSON r.read_nonblock(10240).split("\n").each do |log| log_file << log.rstrip end rescue Errno::EAGAIN rescue Errno::EINTR rescue EOFError => eof stdout = nil if r == stdout stderr = nil if r == stderr end end ensure log_file.write end end end log_file.close end |
#memory_available_to_spawn? ⇒ Boolean
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# File 'app/models/process/naf/runner.rb', line 644 def memory_available_to_spawn? Facter.clear memory_size = Facter.memorysize_mb.to_f memory_free = Facter.memoryfree_mb.to_f memory_free_percentage = (memory_free / memory_size) * 100.0 if (memory_free_percentage >= @minimum_memory_free) logger.detail "memory available: #{memory_free_percentage}% (free) >= #{@minimum_memory_free}% (min percent)" return true end logger.alarm "#{Facter.hostname}.#{Facter.domain}: not enough memory to spawn: #{memory_free_percentage}% (free) < #{@minimum_memory_free}% (min percent)" return false end |
#retrieve_invocation_information ⇒ Object
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# File 'app/models/process/naf/runner.rb', line 141 def retrieve_invocation_information begin repository_name = (`git remote -v`).slice(/:\S+/).sub('.git','')[1..-1] if repository_name.match(/fatal/) repository_name = nil end rescue repository_name = nil end branch_name = (`git rev-parse --abbrev-ref HEAD`).strip if branch_name.match(/fatal/) branch_name = nil end commit_information = (`git log --pretty="%H" -n 1`).strip if commit_information.match(/fatal/) commit_information = nil end deployment_tag = (`git describe --abbrev=0 --tag 2>&1`).strip if deployment_tag.match(/fatal: No names found, cannot describe anything/) deployment_tag = nil end { repository_name: repository_name, branch_name: branch_name, commit_information: commit_information, deployment_tag: deployment_tag } end |
#send_signal_and_maybe_clean_up(job, signal) ⇒ Object
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# File 'app/models/process/naf/runner.rb', line 565 def send_signal_and_maybe_clean_up(job, signal) if job.pid.nil? finish_job(job) return false end begin retval = Process.kill(signal, job.pid) logger.detail "#{retval} = kill(#{signal}, #{job.pid})" rescue Errno::ESRCH logger.detail "ESRCH = kill(#{signal}, #{job.pid})" # job does not exist -- mark it finished finish_job(job) return false end return true end |
#should_be_queued ⇒ Object
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# File 'app/models/process/naf/runner.rb', line 602 def should_be_queued not_finished_applications = ::Naf::HistoricalJob. queued_between(Time.zone.now - Naf::HistoricalJob::JOB_STALE_TIME, Time.zone.now). where("finished_at IS NULL AND request_to_terminate = false"). find_all{ |job| job.application_id.present? }. index_by{ |job| job.application_id } application_last_runs = ::Naf::HistoricalJob.application_last_runs. index_by{ |job| job.application_id } # find the run_interval based schedules that should be queued # select anything that isn't currently running and completed # running more than run_interval minutes ago relative_schedules_what_need_queuin = ::Naf::ApplicationSchedule.where(enabled: true).relative_schedules.select do |schedule| (not_finished_applications[schedule.application_id].nil? && (application_last_runs[schedule.application_id].nil? || (Time.zone.now - application_last_runs[schedule.application_id].finished_at) > (schedule.run_interval.minutes))) end # find the run_start_minute based schedules # select anything that # isn't currently running (or queued) AND # hasn't run since run_start_time AND # should have been run by now AND # that should have run within fudge period AND exact_schedules_what_need_queuin = ::Naf::ApplicationSchedule.where(enabled: true).exact_schedules.select do |schedule| (not_finished_applications[schedule.application_id].nil? && (application_last_runs[schedule.application_id].nil? || ((Time.zone.now.to_date + schedule.run_start_minute.minutes) >= application_last_runs[schedule.application_id].finished_at)) && (Time.zone.now - (Time.zone.now.to_date + schedule.run_start_minute.minutes)) >= 0.seconds && ((Time.zone.now - (Time.zone.now.to_date + schedule.run_start_minute.minutes)) <= (@check_schedules_period * @schedule_fudge_scale).minutes) ) end foreman = ::Logical::Naf::ConstructionZone::Foreman.new() return (relative_schedules_what_need_queuin + exact_schedules_what_need_queuin).select do |schedule| schedule.enqueue_backlogs || !foreman.limited_by_run_group?(schedule.application_run_group_restriction, schedule.application_run_group_name, schedule.application_run_group_limit) end end |
#start_new_jobs ⇒ Object
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# File 'app/models/process/naf/runner.rb', line 361 def start_new_jobs # start new jobs logger.detail "starting new jobs, num children: #{@children.length}/#{machine.thread_pool_size}" # XXX while @children.length < machine.thread_pool_size && memory_available_to_spawn? && current_invocation.wind_down_at.blank? while ::Naf::RunningJob.where(started_on_machine_id: machine.id).count < machine.thread_pool_size && memory_available_to_spawn? && current_invocation.wind_down_at.blank? logger.debug_gross "fetching jobs because: children: #{@children.length} < #{machine.thread_pool_size} (poolsize)" begin running_job = @job_fetcher.fetch_next_job unless running_job.present? logger.debug_gross "no more jobs to run" break end logger.info escape_html("starting new job : #{running_job.inspect}") # fork and run pid, stdin, stdout, stderr = running_job.historical_job.spawn stdin.close # Reset NAF_JOB_ID ENV.delete('NAF_JOB_ID') if pid @children[pid] = running_job running_job.pid = pid running_job.historical_job.pid = pid running_job.historical_job.failed_to_start = false running_job.historical_job.machine_runner_invocation_id = current_invocation.id logger.info escape_html("job started : #{running_job}") running_job.save! running_job.historical_job.save! # Spawn a thread to output the log of each job to files. # # Make sure not to execute any database calls inside this # block, as it will start an ActiveRecord connection for each # thread and eventually raise a ConnetionTimeoutError, resulting # the runner to exit. thread = Thread.new do log_output_until_job_finishes(running_job.id, stdout, stderr) end @threads[pid] = thread else # should never get here (well, hopefully) logger.error escape_html("#{machine}: failed to execute #{running_job}") finish_job(running_job, { failed_to_start: true }) end rescue ActiveRecord::ActiveRecordError => are raise rescue StandardError => e # XXX rescue for various issues logger.error escape_html("#{machine}: failure during job start") logger.warn e end end logger.debug_gross "done starting jobs" end |
#terminate_old_processes(record) ⇒ Object
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# File 'app/models/process/naf/runner.rb', line 509 def terminate_old_processes(record) # check if any processes are hanging around and ask them # politely if they will please terminate jobs = assigned_jobs(record) if jobs.length == 0 logger.detail "no jobs to remove" return end logger.info "number of old jobs to sift through: #{jobs.length}" jobs.each do |job| logger.detail escape_html("job still around: #{job}") if job.request_to_terminate == false logger.warn "politely asking process: #{job.pid} to terminate itself" job.request_to_terminate = true job.save! end end # wait (1..@wait_time_for_processes_to_terminate).each do |i| num_assigned_jobs = assigned_jobs(record).length return if num_assigned_jobs == 0 logger.debug_medium "#{i}/#{@wait_time_for_processes_to_terminate}: sleeping 1 second while we wait for " + "#{num_assigned_jobs} assigned job(s) to terminate as requested" sleep(1) end # nudge them to terminate jobs = assigned_jobs(record) if jobs.length == 0 logger.debug_gross "assigned jobs have exited after asking to terminate nicely" return end jobs.each do |job| logger.warn escape_html("sending SIG_TERM to process: #{job}") send_signal_and_maybe_clean_up(job, "TERM") end # wait (1..5).each do |i| num_assigned_jobs = assigned_jobs(record).length return if num_assigned_jobs == 0 logger.debug_medium "#{i}/5: sleeping 1 second while we wait for #{num_assigned_jobs} assigned job(s) to terminate from SIG_TERM" sleep(1) end # kill with fire assigned_jobs(record).each do |job| logger.alarm escape_html("sending SIG_KILL to process: #{job}") send_signal_and_maybe_clean_up(job, "KILL") # job force job down finish_job(job) end end |
#update_historical_job(updates, historical_job_id) ⇒ Object
XXX update_all doesn’t support “from_partition” so we have this helper
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# File 'app/models/process/naf/runner.rb', line 466 def update_historical_job(updates, historical_job_id) updates[:updated_at] = Time.zone.now update_columns = updates.map{ |k,v| "#{k} = ?" }.join(", ") update_sql = <<-SQL UPDATE #{::Naf::HistoricalJob.partition_table_name(historical_job_id)} SET #{update_columns} WHERE id = ? SQL ::Naf::HistoricalJob.find_by_sql([update_sql] + updates.values + [historical_job_id]) end |
#wind_down_runners ⇒ Object
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# File 'app/models/process/naf/runner.rb', line 121 def wind_down_runners machine.machine_runners.each do |runner| runner.machine_runner_invocations.each do |invocation| if invocation.dead_at.blank? begin retval = Process.kill(0, invocation.pid) logger.detail "#{retval} = kill(0, #{invocation.pid}) -- process alive, marking runner invocation as winding down" invocation.wind_down_at = Time.zone.now invocation.save! rescue Errno::ESRCH logger.detail "ESRCH = kill(0, #{invocation.pid}) -- marking runner invocation as not running" invocation.dead_at = Time.zone.now invocation.save! terminate_old_processes(invocation) end end end end end |
#work ⇒ Object
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# File 'app/models/process/naf/runner.rb', line 64 def work check_gc_configurations @machine = ::Naf::Machine.find_by_server_address(@server_address) unless machine.present? logger.fatal "This machine is not configued correctly (ipaddress: #{@server_address})." logger.fatal "Please update #{::Naf::Machine.table_name} with an entry for this machine." logger.fatal "Exiting..." exit 1 end machine.lock_for_runner_use begin cleanup_old_processes wind_down_runners # Create a machine runner, if it doesn't exist machine_runner = ::Naf::MachineRunner. find_or_create_by_machine_id_and_runner_cwd(machine_id: machine.id, runner_cwd: Dir.pwd) # Create an invocation for this runner @current_invocation = ::Naf::MachineRunnerInvocation. create!({ machine_runner_id: machine_runner.id, pid: Process.pid, uuid: @invocation_uuid }.merge!(retrieve_invocation_information)) ensure machine.unlock_for_runner_use end begin work_machine ensure @current_invocation.dead_at = Time.zone.now @current_invocation.save! cleanup_old_processes end end |
#work_machine ⇒ Object
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# File 'app/models/process/naf/runner.rb', line 171 def work_machine machine.mark_alive machine.mark_up # Make sure no processes are thought to be running on this machine terminate_old_processes(machine) if @kill_all_runners logger.info escape_html("working: #{machine}") @children = {} @threads = {} at_exit { ::Af::Application.singleton.emergency_teardown } @job_fetcher = ::Logical::Naf::JobFetcher.new(machine) while true break unless work_machine_loop GC.start end logger.info "runner quitting" end |
#work_machine_loop ⇒ Object
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# File 'app/models/process/naf/runner.rb', line 197 def work_machine_loop machine.reload # Check machine status if !machine.enabled logger.warn escape_html("this machine is disabled #{machine}") return false elsif machine.marked_down logger.warn escape_html("this machine is marked down #{machine}") return false end machine.mark_alive check_log_level @current_invocation.reload if current_invocation.wind_down_at.present? logger.warn "invocation asked to wind down" if @children.length == 0 return false; end else check_schedules start_new_jobs end cleanup_dead_children return true end |