TS.RANGE reports ERR TSDB: wrong fromTimestamp

Redis modules RedisTimeSeries
1

Good evening, I have the following question please:

With Azure Redis Cache (Enterprise E10 with TimeSeries module enabled) it is possible to retrieve all timestamps from a time series for the key “12345678:5” by calling:

$ TS.RANGE 12345678:5 - +
 1) 1) (integer) 1693407731665
    2) 1
 2) 1) (integer) 1693407731694
    2) 1
 3) 1) (integer) 1693407731745
    2) 1
 4) 1) (integer) 1693407731771
    2) 1
.....
18) 1) (integer) 1693407732075
    2) 1
19) 1) (integer) 1693407732103
    2) 1
20) 1) (integer) 1693407732127
    2) 1

But I am only interested in the timestamps/values of the recent 30 minutes (1800000 milliseconds).

So I calculate the timestamps “start” and “now” by the Lua script:

$ EVAL "local time = redis.call('TIME'); local now = time[1] * 1000 + time[2] / 1000; local start = now - tonumber(ARGV[1]); return { tonumber(ARGV[1]), start, now }" 1 12345678:5 1800000
1) (integer) 1800000
2) (integer) 1693493878001
3) (integer) 1693495678001

And then I try to call TS.RANGE using the Lua script:

$ EVAL "local time = redis.call('TIME'); local now = time[1] * 1000 + time[2] / 1000; local start = now - tonumber(ARGV[1]); local tsrange = redis.call('TS.RANGE', KEYS[1], start, now); return tsrange" 1 12345678:5 1800000
(error) ERR Error running script (call to f_a99152dc66083038fe6d6b9b6acef33495ef1960): @user_script:1: ERR TSDB: wrong fromTimestamp

Please advise me, what am I doing wrong?

My real background is that I try to call TS.ADD and TS.RANGE in my C# web app (the auto-expiration does not really seem to work, so I cannot use “TS.RANGE key - +”, but have to specify the fromTimestamp, toTimestamp arguments to TS.RANGE explicitly):

private static readonly TimeSpan RETENTION_TIME = TimeSpan.FromMinutes(30);
// The script returns 0 if there are 20 or more timestamps in the past 30 min (1800000 ms).
// Otherwise it adds a new timestamp to the time series at the key and returns 1.
private const string LUA_SCRIPT =
@"
local sum = 0
local time = redis.call('TIME')
-- the final timestamp for TS.RANGE command in milliseconds
local now = time[1] * 1000 + time[2] / 1000
-- the start timestamp for TS.RANGE command in milliseconds
local start = now - tonumber(ARGV[1])
local tsrange = redis.call('TS.RANGE', KEYS[1], start, now)

for i = 1, #tsrange do
    -- calculate a sum of all values stored in the time series, from start to now
    sum = sum + tsrange[i][2]['ok']

    -- if there are enough timestamps in the time period, then just return 0
    if (sum >= 20) then
        return 0
    end
end

-- otherwise add the current timestamp and the value 1 to the time series
redis.call('TS.ADD', KEYS[1], '*', 1, 'RETENTION', ARGV[1], 'ON_DUPLICATE', 'SUM', 'ENCODING', 'UNCOMPRESSED')
return 1
";

private static async Task<bool> AddTimestampAsync(IDatabase db, string key, long retentionTime)
{
    RedisResult result = await db.ScriptEvaluateAsync(LUA_SCRIPT, new RedisKey[] { key }, new RedisValue[] { retentionTime });
    // return true if the Lua script returns 1, otherwise false
    return result.Type == ResultType.Integer && (int)result == 1;
}

I hope that I do not have to workaround my issue by modifying the for-loop above and comparing each timestamp one by one…

Thank you
Alex

2

Solved in cross-post: redis - TS.RANGE reports ERR TSDB: wrong fromTimestamp - Stack Overflow