Class: SolrSnapshotter

Inherits:
Object
  • Object
show all
Defined in:
common/solr_snapshotter.rb

Class Method Summary collapse

Class Method Details

.do_snapshot(identifier = nil) ⇒ Object 



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# File 'common/solr_snapshotter.rb', line 88

def self.do_snapshot(identifier = nil)
  unless File.directory?(AppConfig[:solr_index_directory])
    log(:info, "Skipping Solr snapshot, not a directory: #{AppConfig[:solr_index_directory]}")
    return
  end

  identifier ||= Time.now.to_i

  target = File.join(AppConfig[:solr_backup_directory], "solr.#{identifier}")

  FileUtils.mkdir_p(target)

  FileUtils.cp_r(File.join(AppConfig[:data_directory], "indexer_state"),
                 target)

  begin
    most_recent_status = self.last_snapshot_status
    most_recent_snapshot = self.latest_snapshot
    log(:info, "Previous snapshot status: #{most_recent_status}; snapshot: #{most_recent_snapshot}")


    response = ASHTTP.get_response(URI.join(AppConfig[:solr_url],
                                               "/replication?command=backup&numberToKeep=1"))


    raise "Error from Solr: #{response.body}" if response.code != '200'


    # Wait for a new snapshot directory to turn up
    60.times do
      break if most_recent_snapshot != self.latest_snapshot
      log(:info, "Waiting for new snapshot directory")
      sleep 1
    end

    if most_recent_snapshot == self.latest_snapshot
      raise "No new snapshot directory appeared"
    end

    wait_for_snapshot_to_finish(most_recent_status, self.latest_snapshot)
    new_snapshot = self.latest_snapshot

    FileUtils.mv(new_snapshot, target).inspect
    self.expire_snapshots
  rescue
    raise "Solr snapshot failed: #{$!}: #{$@}"
    begin
      FileUtils.rm_rf(target)
    rescue
    end
  end
end

.expire_snapshots ⇒ Object 



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# File 'common/solr_snapshotter.rb', line 14

def self.expire_snapshots
  backups = []
  backups_dir = AppConfig[:solr_backup_directory]

  Dir.foreach(backups_dir) do |filename|
    if filename =~ /^solr\.[0-9]+$/
      backups << File.join(backups_dir, filename)
    end
  end

  victims = backups.sort.reverse.drop(AppConfig[:solr_backup_number_to_keep])

  victims.each do |backup_dir|

    if File.exist?(File.join(backup_dir, "indexer_state"))
      log(:info, "Expiring old Solr snapshot: #{backup_dir}")
      FileUtils.rm_rf(backup_dir)
    else
      log(:info, "Too cowardly to delete: #{backup_dir}")
    end
  end
end

.last_snapshot_status ⇒ Object 



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# File 'common/solr_snapshotter.rb', line 43

def self.last_snapshot_status
  response = ASHTTP.get_response(URI.join(AppConfig[:solr_url],
                                          "/replication?command=details&wt=json"))

  if response.code != '200'
    raise "Problem when getting snapshot details: #{response.body}"
  end

  status = JSON.parse(response.body)

  Hash[Array(status.fetch('details', {})['backup']).each_slice(2).to_a]
end

.latest_snapshot ⇒ Object 



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# File 'common/solr_snapshotter.rb', line 38

def self.latest_snapshot
  latest = Dir.glob(File.join(AppConfig[:solr_index_directory], "snapshot.*")).sort.last
end

.log(level, msg) ⇒ Object 



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# File 'common/solr_snapshotter.rb', line 6

def self.log(level, msg)
  if defined?(Log)
    Log.send(level, msg)
  else
    $stderr.puts("#{level.to_s.upcase}: #{msg}")
  end
end

.snapshot(identifier = nil) ⇒ Object 



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# File 'common/solr_snapshotter.rb', line 57

def self.snapshot(identifier = nil)
  retries = 5

  retries.times do |i|
    begin
      SolrSnapshotter.do_snapshot(identifier)
      break
    rescue
      log(:error, "Solr snapshot failed (#{$!}) - attempt #{i}")

      if (i + 1) == retries
        raise "Solr snapshot failed after #{retries} retries: #{$!}"
      end
    end
  end
end

.wait_for_snapshot_to_finish(starting_status, starting_snapshot) ⇒ Object 



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# File 'common/solr_snapshotter.rb', line 75

def self.wait_for_snapshot_to_finish(starting_status, starting_snapshot)
  while true
    raise "Concurrent snapshot detected.  Bailing out!" if self.latest_snapshot != starting_snapshot

    status = self.last_snapshot_status
    break if status != starting_status

    # Wait for the backup status to be updated
    sleep 5
  end
end