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  | 
namespace :cache do
  namespace :clear do
    REDIS_CLEAR_BATCH_SIZE = 1000 # There seems to be no speedup when pushing beyond 1,000
    REDIS_SCAN_START_STOP = '0'.freeze # Magic value, see http://redis.io/commands/scan
    desc "GitLab | Clear redis cache"
    task redis: :environment do
      Gitlab::Redis.with do |redis|
        cursor = REDIS_SCAN_START_STOP
        loop do
          cursor, keys = redis.scan(
            cursor,
            match: "#{Gitlab::Redis::CACHE_NAMESPACE}*",
            count: REDIS_CLEAR_BATCH_SIZE
          )
          redis.del(*keys) if keys.any?
          break if cursor == REDIS_SCAN_START_STOP
        end
      end
    end
    task all: [:redis]
  end
  task clear: 'cache:clear:redis'
end
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