find-and-deleting-redis-keys

Delete all redis keys used by cached_find_by method. This has been useful when we need to clear all cached_find_by due to serialization issues:

Rails.cache.delete_matched("find_*")

Find and delete redis big keys

#Find large values
tot_size = 0
REDIS.keys('*').each do |key|
  if key.include?('cache:app_accesses') || key.include?('cache:roles_user')
    REDIS.del(key)
    next
  end

  type = type = REDIS.type(key)
  next if type=='none' #Ignore if key has already been removed
  if type=='string'
      val = REDIS.get(key)
      len = val.length
  elsif type=='hash'
      len = REDIS.hvals(key).to_s.length
  elsif type=='list'
    len = REDIS.llen(key)
  elsif type=='set'
    len = REDIS.scard(key)
  else 
    len = 0
      puts "Unkown Type: #{type}. Key: #{key}"
  end
  tot_size += len if len.present?
  if len > 100000 
      puts "Big key: #{key}. Type: #{type}. Length #{len}"
    REDIS.del(key)
  end
end; puts 'done'