How to search the keyspace in Redis using JEDISCLUSTER client? - redis

Question

I am storing Map in a keyspace in REDIS. I have stored multiple Map in multiple keyspace as shown in the code. Now I want to search the keyspace using wildcard. Is it possible, if yes how to do that?
package kafka;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import redis.clients.jedis.JedisCluster;
import redis.clients.jedis.ScanParams;
public class Test {
public static void main(String[] args) {
JedisCluster connection = JedisConnection.getInstance().getconnection();
Map<String, String> ks = new HashMap<>();
ks.put("one", "one");
ks.put("two", "two");
ks.put("four", "four");
connection.hmset("parent_child1", ks);
Map<String, String> ks1 = new HashMap<>();
ks1.put("one", "one1");
ks1.put("two", "two1");
ks1.put("three", "three");
connection.hmset("parent_child2", ks1);
Map<String, String> ks2 = new HashMap<>();
ks2.put("one", "one2");
ks2.put("two", "two1");
ks2.put("three", "three3");
connection.hmset("parent_child3", ks2);
Map<String, String> ks3 = new HashMap<>();
ks3.put("one", "one3");
ks3.put("two", "two3");
ks3.put("three", "three3");
connection.hmset("parent_child1", ks3);
System.out.println(connection.hkeys("parent_child1"));
//Output : [two, three, four, one]
connection.hscan("parent_*", "0", new ScanParams().match("{parent_}"));
connection.hscan("parent_*", "0");
System.out.println(connection.hgetAll("parent_child1"));
//Output: {two=two3, three=three3, four=four, one=one3}
}
}
Now I want to search the keyspace using parent_* so that it give me all keyspace name starting with parent_ i.e. parent_child1, parent_child2, parent_child3.

Answer 1

As mentioned in this JedisCluster : Scan For Key does not work
You have to iterate through all your nodes and search for the keys like below.
Set<byte[]> keys = new HashSet<>();
Map<String, JedisPool> nodes = connection.getClusterNodes();
for(String key : nodes.keySet()) {
JedisPool jedisPool = nodes.get(key);
Jedis jedis = jedisPool.getResource();
keys.addAll(connection.keys("parent_*"));
jedis.close();
}