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Redisson client: retrieve top N keys

How can i get top of N keys from redisson client?

I found next signature in getKeysByPattern() method:

Iterable<String> getKeysByPattern(String pattern, int count);

But looks like count – is keys loaded per request to Redis.

How can i load top N keys from Redis via redisson client?

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2

Answers


  1. Chosen as BEST ANSWER
    0

    getKeysByPattern() is not valid for such case, right.

    It's better to use lua scripts here:

    val luaScript = "return {redis.call('SCAN',ARGV[1],'MATCH',ARGV[2],'COUNT',ARGV[3])}"
var cursor = 0
do {
  val data = redissonClient
                .getScript(StringCodec.INSTANCE)
                .eval(RScript.Mode.READ_ONLY,
                        luaScript,
                        RScript.ReturnType.MAPVALUELIST,
                        listOf(),
                        cursor,
                        "some-pattern",
                        batchSize)


  val redistListData = (data[0][1] as List<String>)
  cursor = data[0][0].toInt()
} while (cursor != 0)

  2. 0

    You need to use RKeys.getKeysWithLimit(String pattern, int limit) method for this case.

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