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namespace :cache do
CLEAR_BATCH_SIZE = 1000 # The more the faster, but having too many can crash Ruby
REDIS_SCAN_START_STOP = '0' # Magic value, see http://redis.io/commands/scan
desc "GitLab | Clear redis cache"
task :clear => :environment do
redis_store = Rails.cache.instance_variable_get(:@data)
cursor = REDIS_SCAN_START_STOP
loop do
cursor, keys = redis_store.scan(
cursor,
match: "#{Gitlab::REDIS_CACHE_NAMESPACE}*",
count: CLEAR_BATCH_SIZE
)
redis_store.del(*keys) if keys.any?
break if cursor == REDIS_SCAN_START_STOP
end
end
end
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