Class: Kafkat::Command::ResignForce

Inherits:
Base
  • Object
show all
Defined in:
lib/kafkat/command/resign-rewrite.rb

Instance Attribute Summary

Attributes inherited from Base

#config

Instance Method Summary collapse

Methods inherited from Base

#admin, #initialize, #kafka_logs, register_as, usage, usages, #zookeeper

Methods included from Logging

#print_err

Methods included from Kafkat::CommandIO

#prompt_and_execute_assignments

Methods included from Formatting

#justify, #print_assignment, #print_assignment_header, #print_broker, #print_broker_header, #print_partition, #print_partition_header, #print_topic, #print_topic_header, #print_topic_name

Constructor Details

This class inherits a constructor from Kafkat::Command::Base

Instance Method Details

#run ⇒ Object 



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# File 'lib/kafkat/command/resign-rewrite.rb', line 12

def run
  broker_id = ARGV[0] && ARGV.shift.to_i
  if broker_id.nil?
    puts "You must specify a broker ID."
    exit 1
  end

  opts = Trollop.options do
    opt :force, "force"
  end

  print "This operation rewrites leaderships in ZK to exclude broker '#{broker_id}'.\n"
  print "WARNING: This is a last resort. Try the 'shutdown' command first!\n\n".red

  return unless agree("Proceed (y/n)?")

  brokers = zookeeper.get_brokers
  topics = zookeeper.get_topics
  force = opts[:force]

  ops = {}
  topics.each do |_, t|
    t.partitions.each do |p|
      next if p.leader != broker_id

      alternates = p.isr.reject { |i| i == broker_id }
      new_leader_id = alternates.sample

      if !new_leader_id && !force
        print "Partition #{t.name}-#{p.id} has no other ISRs!\n"
        exit 1
      end

      new_leader_id ||= -1
      ops[p] = new_leader_id
    end
  end

  print "\n"
  print "Summary of the new assignments:\n\n"

  print "Partition\tLeader\n"
  ops.each do |p, lid|
    print justify("#{p.topic_name}-#{p.id}")
    print justify(lid.to_s)
    print "\n"
  end

  begin
    print "\nStarting.\n"
    ops.each do |p, lid|
      retryable(tries: 3, on: Interface::Zookeeper::WriteConflictError) do
        zookeeper.write_leader(p, lid)
      end
    end
  rescue Interface::Zookeeper::WriteConflictError => e
    print "Failed to update leaderships in ZK. Try re-running.\n\n"
    exit 1
  end

  print "Done.\n"
end