JedisPooled ## Could not get a resource from the pool

[ashok-mariyala]

Expected behavior

Java Jedis client work with thousands of reads and write on redis server.

Actual behavior

Jedis client gives Could not get a resource from the pool error while performing huge write and read operations on redis client

Stack trace

Error : Could not get a resource from the pool
redis.clients.jedis.exceptions.JedisException: Could not get a resource from the pool
        at redis.clients.jedis.util.Pool.getResource(Pool.java:42) ~[jedis-4.4.3.jar:?]
        at redis.clients.jedis.ConnectionPool.getResource(ConnectionPool.java:29) ~[jedis-4.4.3.jar:?]
        at redis.clients.jedis.ConnectionPool.getResource(ConnectionPool.java:7) ~[jedis-4.4.3.jar:?]
        at redis.clients.jedis.providers.PooledConnectionProvider.getConnection(PooledConnectionProvider.java:68) ~[jedis-4.4.3.jar:?]
        at redis.clients.jedis.executors.DefaultCommandExecutor.executeCommand(DefaultCommandExecutor.java:23) ~[jedis-4.4.3.jar:?]
        at redis.clients.jedis.UnifiedJedis.executeCommand(UnifiedJedis.java:183) ~[jedis-4.4.3.jar:?]
        at redis.clients.jedis.UnifiedJedis.set(UnifiedJedis.java:651) ~[jedis-4.4.3.jar:?]
        at com.ashok.redis.manager.RedisCacheStore.putCache(RedisCacheStore.java:155) ~[redis-manager-17.1.0.jar:?]
Caused by: java.lang.InterruptedException
        at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.reportInterruptAfterWait(Unknown Source) ~[?:?]
        at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source) ~[?:?]
        at org.apache.commons.pool2.impl.LinkedBlockingDeque.takeFirst(LinkedBlockingDeque.java:594) ~[commons-pool2-2.8.0.jar:2.8.0]
        at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:437) ~[commons-pool2-2.8.0.jar:2.8.0]
        at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:354) ~[commons-pool2-2.8.0.jar:2.8.0]
        at redis.clients.jedis.util.Pool.getResource(Pool.java:38) ~[jedis-4.4.3.jar:?]
        ... 27 more

Steps to reproduce:

Please create a reproducible case of your problem. Make sure that case repeats consistently and it's not random

1. Deploy Redis standalone deployment in Kubernetes cluster
2. Deploy Java Application with Jedis client in the same Kubernetes cluster
3. Perform reads and writes with JedisPooled class

Java Code Snippets Redis connection initialization

JedisPooled jedisPool = null;
private RedisCacheStore( ) {
	initRedisConnection();
}

private void initRedisConnection() {
	try {
                jedisPool = new JedisPooled("redis", 6379, timeout, "default", "Ashok@Redis");
	} catch(Exception e) {
		e.printStackTrace()		
       }
}

Inserting data to the redis server

public boolean putCache(String storeName, String key, String value) throws Exception {	
        String data = jedis.get(storeName);
        JsonObject json;
        if (data == null) {
            json = new JsonObject();
        } else {
        	Gson gson = new Gson();
        	json = gson.fromJson(data, JsonObject.class);
        }
        
        synchronized (jo) {
        	jo.addProperty(key, value);
                jedis.set(storeName,jo.toString());
            return true;
	}
}

Redis / Jedis Configuration

Jedis version:

4.4.3

Redis version:

redis:7.2.4-debian-11-r0

Java version:

11.0.20.1