IOredis Connection is Closed error in Nodejs - node.js

Question

IOredis Connection is Closed error in Nodejs. We are using ioredis npm, When we are trying to getting the data from redis, we are getting "Connection is Closed" errors.
Actually, in calling the hnormalget() function is giving Connection is Closed error.
var redis = require('ioredis');
var config = require('./../../config');
var redisConfig = config.database;
var clientRead = Promise.promisifyAll(redis.createClient({
port: config.database.redisPort,
host: config.database.redisHost,
prefix: config.database.redisPrefix,
password: config.database.redisPassword,
connectionName: 'redisDB-gpRedisCacheRead',
db:10,
readOnly: true,
keepAlive: 1,
retryStrategy : function retryStrategy(times) {
log.error("Redis retry strategy called for gpRedisCache.js...44")
if (typeof times != "number") {
// Manual Reconnect would be require
// redis.connect()
return new Error('Redis Retry time exhausted');
}
const delay = Math.min(times * 50, 2000);
return delay;
}
}));
var DBNUM = config.redis.GPDatabaseNum;
clientRead.on('connect', function() {
clientRead.select(DBNUM, function(e, r) {
if (e) {
log.error(`Error in redis Read select db server/lib/gpRedisCache.js: ${e}`);
clientRead.end(true); //also initiate reconnection
} else {
// console.log('clientRead connected');
}
});
}); //end of client.on('connect')
clientRead.on('error', function(err) {
log.error(`Error in redis connection on file gpRedisCache.js:95: ${err}`);
clientRead.end(true); //also initiate reconnection here
});
var redisCacheSeparateReadWritePooledConn = {
hnormalget: (hashKey, key, cb) => {
return clientRead.hget(hashKey, key).then((data) => {
return { err: null, data };
}).catch(err => {
return { err };
});
},
}
//TILL above is the handling for single conn
module.exports = redisCacheSeparateReadWritePooledConn;