ioredis: Cluster: Failed to refresh slots cache. when options.redisOptions.enableOfflineQueue = false

If I pass options to new Cluster with options.redisOptions.enableOfflineQueue = false, ioredis (3.2.2) fails to connect to the cluster. If I remove setting that specific option, then everything is good (went through them one-by-one).

Below is sample code with the output when options.redisOptions.enableOfflineQueue = false.

Note that I also have set options.enableOfflineQueue = false - it is not entirely clear if both need to be set. In my usage, I do NOT want commands to be queued when the cluster or the intended node is not available.

'use strict';

let Redis = require('ioredis');

function _retryStrategy(times) {
    let retry;

    if (times === 1) {
        retry = 1;  // immediate retry
    } else {
        retry = Math.min((times - 1) * 2000, 20000);
    }
    return retry;
}

const options = {
    // Cluster-level options
    // Override ioredis defaults.
    clusterRetryStrategy   : _retryStrategy,
    enableOfflineQueue     : false,                     // ioredis default is true
    scaleReads             : 'all',                     // ioredis default is 'master'

    // ioredis defaults - explicitly set for clarity.
    enableReadyCheck       : true,
    maxRedirections        : 16,
    retryDelayOnFailover   : 100,
    retryDelayOnClusterDown: 100,
    retryDelayOnTryAgain   : 100,

    // Per Server options
    redisOptions: {
        // Override ioredis defaults.
        enableOfflineQueue           : false,           // ioredis default is true   !!! THIS IS THE PROBLEM !!!
        connectTimeout               : 2000,            // ioredis default is 10000
        autoResendUnfulfilledCommands: false,           // ioredis default is true
        retryStrategy                : _retryStrategy,
        readOnly                     : true,            // ioredis default is false

        // ioredis defaults - explicitly set for clarity.
        family           : 4,
        path             : null,
        keepAlive        : 0,
        noDelay          : true,
        db               : 0,
        dropBufferSupport: false,
        enableReadyCheck : true,
        autoResubscribe  : true,
        lazyConnect      : false,
        keyPrefix        : '',
        stringNumbers    : false
     }
};

let startupNodes = [];
for (let i = 0; i < 3; i++) {
    startupNodes[i] = {
        host: '127.0.0.1',
        port: 6400 + (10*i)
    };
    console.log('Using startupNode %s:%d.', startupNodes[i].host, startupNodes[i].port);
}

let client = new Redis.Cluster(startupNodes, options);

client.on('ready', function() {
    console.log('Redis Cluster is Ready.');
});

client.cluster('info', function (err, clusterInfo) {
    if (err) {
        console.log('Redis Cluster is not yet ready. err=%j', err);
    } else {
        console.log('Redis Cluster Info=%j', clusterInfo);
    }
});

/usr/src/app# DEBUG=ioredis:* node clustertest.js    
Using startupNode 127.0.0.1:6400.
Using startupNode 127.0.0.1:6410.
Using startupNode 127.0.0.1:6420.
  ioredis:cluster status: [empty] -> connecting +0ms
  ioredis:redis status[127.0.0.1:6400]: [empty] -> connecting +3ms
  ioredis:redis status[127.0.0.1:6410]: [empty] -> connecting +2ms
  ioredis:redis status[127.0.0.1:6420]: [empty] -> connecting +0ms
  ioredis:cluster getting slot cache from 127.0.0.1:6410 +1ms
  ioredis:redis status[127.0.0.1:6400]: connecting -> connect +15ms
  ioredis:redis write command[0] -> info() +0ms
  ioredis:redis status[127.0.0.1:6410]: connecting -> connect +2ms
  ioredis:redis write command[0] -> info() +0ms
  ioredis:redis status[127.0.0.1:6420]: connecting -> connect +1ms
  ioredis:redis write command[0] -> info() +0ms
  ioredis:cluster getting slot cache from 127.0.0.1:6420 +3ms
Redis Cluster is not yet ready. err={}
  ioredis:cluster getting slot cache from 127.0.0.1:6400 +2ms
[ioredis] Unhandled error event: Error: Failed to refresh slots cache.
    at tryNode (/usr/src/app/node_modules/ioredis/lib/cluster/index.js:375:19)
    at /usr/src/app/node_modules/ioredis/lib/cluster/index.js:387:9
    at /usr/src/app/node_modules/ioredis/lib/cluster/index.js:591:14
    at run (/usr/src/app/node_modules/ioredis/lib/utils/index.js:153:16)
    at tryCatcher (/usr/src/app/node_modules/bluebird/js/release/util.js:16:23)
    at Promise.errorAdapter [as _rejectionHandler0] (/usr/src/app/node_modules/bluebird/js/release/nodeify.js:35:34)
    at Promise._settlePromise (/usr/src/app/node_modules/bluebird/js/release/promise.js:566:21)
    at Promise._settlePromise0 (/usr/src/app/node_modules/bluebird/js/release/promise.js:614:10)
    at Promise._settlePromises (/usr/src/app/node_modules/bluebird/js/release/promise.js:689:18)
    at Async._drainQueue (/usr/src/app/node_modules/bluebird/js/release/async.js:133:16)
    at Async._drainQueues (/usr/src/app/node_modules/bluebird/js/release/async.js:143:10)
    at Immediate.Async.drainQueues (/usr/src/app/node_modules/bluebird/js/release/async.js:17:14)
    at runCallback (timers.js:789:20)
    at tryOnImmediate (timers.js:751:5)
    at processImmediate [as _immediateCallback] (timers.js:722:5)
  ioredis:redis status[127.0.0.1:6410]: connect -> ready +7ms
  ioredis:redis status[127.0.0.1:6420]: connect -> ready +2ms
  ioredis:redis status[127.0.0.1:6420]: ready -> close +1ms
  ioredis:connection skip reconnecting since the connection is manually closed. +0ms
  ioredis:redis status[127.0.0.1:6420]: close -> end +0ms
  ioredis:redis status[127.0.0.1:6410]: ready -> close +1ms
  ioredis:connection skip reconnecting since the connection is manually closed. +0ms
  ioredis:redis status[127.0.0.1:6410]: close -> end +0ms
  ioredis:redis status[127.0.0.1:6400]: connect -> ready +1ms
  ioredis:redis status[127.0.0.1:6400]: ready -> close +0ms
  ioredis:connection skip reconnecting since the connection is manually closed. +0ms
  ioredis:redis status[127.0.0.1:6400]: close -> end +1ms
  ioredis:cluster status: connecting -> close +0ms
  ioredis:cluster status: close -> reconnecting +1ms
  ioredis:cluster Cluster is disconnected. Retrying after 1ms +2ms
  ioredis:cluster status: reconnecting -> connecting +0ms
  ioredis:redis status[127.0.0.1:6400]: [empty] -> connecting +1ms
  ioredis:redis status[127.0.0.1:6410]: [empty] -> connecting +1ms
  ioredis:redis status[127.0.0.1:6420]: [empty] -> connecting +1ms
  ioredis:cluster getting slot cache from 127.0.0.1:6410 +0ms
  ioredis:redis status[127.0.0.1:6400]: connecting -> connect +3ms
  ioredis:redis write command[0] -> info() +1ms
  ioredis:redis status[127.0.0.1:6410]: connecting -> connect +0ms
  ioredis:redis write command[0] -> info() +0ms
  ioredis:redis status[127.0.0.1:6420]: connecting -> connect +1ms
  ioredis:redis write command[0] -> info() +0ms
  ioredis:cluster getting slot cache from 127.0.0.1:6420 +0ms
  ioredis:cluster getting slot cache from 127.0.0.1:6400 +1ms
[ioredis] Unhandled error event: Error: Failed to refresh slots cache.
    at tryNode (/usr/src/app/node_modules/ioredis/lib/cluster/index.js:375:19)
    at /usr/src/app/node_modules/ioredis/lib/cluster/index.js:387:9
    at /usr/src/app/node_modules/ioredis/lib/cluster/index.js:591:14
    at run (/usr/src/app/node_modules/ioredis/lib/utils/index.js:153:16)
    at tryCatcher (/usr/src/app/node_modules/bluebird/js/release/util.js:16:23)
    at Promise.errorAdapter [as _rejectionHandler0] (/usr/src/app/node_modules/bluebird/js/release/nodeify.js:35:34)
    at Promise._settlePromise (/usr/src/app/node_modules/bluebird/js/release/promise.js:566:21)
    at Promise._settlePromise0 (/usr/src/app/node_modules/bluebird/js/release/promise.js:614:10)
    at Promise._settlePromises (/usr/src/app/node_modules/bluebird/js/release/promise.js:689:18)
    at Async._drainQueue (/usr/src/app/node_modules/bluebird/js/release/async.js:133:16)
    at Async._drainQueues (/usr/src/app/node_modules/bluebird/js/release/async.js:143:10)
    at Immediate.Async.drainQueues (/usr/src/app/node_modules/bluebird/js/release/async.js:17:14)
    at runCallback (timers.js:789:20)
    at tryOnImmediate (timers.js:751:5)
    at processImmediate [as _immediateCallback] (timers.js:722:5)
  ioredis:redis status[127.0.0.1:6410]: connect -> ready +7ms
  ioredis:redis status[127.0.0.1:6410]: ready -> close +1ms
  ioredis:connection skip reconnecting since the connection is manually closed. +1ms
  ioredis:redis status[127.0.0.1:6410]: close -> end +0ms
  ioredis:redis status[127.0.0.1:6400]: connect -> ready +4ms
  ioredis:redis status[127.0.0.1:6420]: connect -> ready +1ms
  ioredis:redis status[127.0.0.1:6420]: ready -> close +0ms
  ioredis:connection skip reconnecting since the connection is manually closed. +0ms
  ioredis:redis status[127.0.0.1:6420]: close -> end +1ms
  ioredis:redis status[127.0.0.1:6400]: ready -> close +0ms
  ioredis:connection skip reconnecting since the connection is manually closed. +0ms
  ioredis:redis status[127.0.0.1:6400]: close -> end +0ms
  ioredis:cluster status: connecting -> close +0ms
  ioredis:cluster status: close -> reconnecting +1ms
^C

If I comment out the one line, then all is good:

/usr/src/app# DEBUG=ioredis:* node clustertest.js
Using startupNode 127.0.0.1:6400.
Using startupNode 127.0.0.1:6410.
Using startupNode 127.0.0.1:6420.
  ioredis:cluster status: [empty] -> connecting +0ms
  ioredis:redis status[127.0.0.1:6400]: [empty] -> connecting +3ms
  ioredis:redis status[127.0.0.1:6410]: [empty] -> connecting +3ms
  ioredis:redis status[127.0.0.1:6420]: [empty] -> connecting +0ms
  ioredis:cluster getting slot cache from 127.0.0.1:6420 +2ms
  ioredis:redis queue command[0] -> cluster(slots) +2ms
  ioredis:redis queue command[0] -> cluster(info) +2ms
  ioredis:redis status[127.0.0.1:6400]: connecting -> connect +6ms
  ioredis:redis write command[0] -> info() +1ms
  ioredis:redis status[127.0.0.1:6410]: connecting -> connect +2ms
  ioredis:redis write command[0] -> info() +0ms
  ioredis:redis status[127.0.0.1:6420]: connecting -> connect +0ms
  ioredis:redis write command[0] -> info() +0ms
  ioredis:redis status[127.0.0.1:6410]: connect -> ready +14ms
  ioredis:connection send 1 commands in offline queue +0ms
  ioredis:redis write command[0] -> cluster(info) +1ms
  ioredis:redis status[127.0.0.1:6400]: connect -> ready +1ms
Redis Cluster Info="cluster_state:ok\r\ncluster_slots_assigned:16384\r\ncluster_slots_ok:16384\r\ncluster_slots_pfail:0\r\ncluster_slots_fail:0\r\ncluster_known_nodes:6\r\ncluster_size:3\r\ncluster_current_epoch:3\r\ncluster_my_epoch:2\r\ncluster_stats_messages_ping_sent:7405\r\ncluster_stats_messages_pong_sent:6762\r\ncluster_stats_messages_meet_sent:1\r\ncluster_stats_messages_sent:14168\r\ncluster_stats_messages_ping_received:6758\r\ncluster_stats_messages_pong_received:7406\r\ncluster_stats_messages_meet_received:4\r\ncluster_stats_messages_received:14168\r\n"
  ioredis:redis status[127.0.0.1:6420]: connect -> ready +2ms
  ioredis:connection send 1 commands in offline queue +1ms
  ioredis:redis write command[0] -> cluster(slots) +0ms
  ioredis:redis status[127.0.0.1:6401]: [empty] -> connecting +11ms
  ioredis:redis status[127.0.0.1:6421]: [empty] -> connecting +1ms
  ioredis:redis status[127.0.0.1:6411]: [empty] -> connecting +0ms
  ioredis:cluster status: connecting -> connect +1ms
  ioredis:redis write command[0] -> cluster(info) +1ms
  ioredis:redis status[127.0.0.1:6401]: connecting -> connect +3ms
  ioredis:redis write command[0] -> info() +1ms
  ioredis:redis status[127.0.0.1:6421]: connecting -> connect +1ms
  ioredis:redis write command[0] -> info() +1ms
  ioredis:redis status[127.0.0.1:6411]: connecting -> connect +0ms
  ioredis:redis write command[0] -> info() +0ms
  ioredis:cluster status: connect -> ready +1ms
Redis Cluster is Ready.
  ioredis:redis status[127.0.0.1:6411]: connect -> ready +5ms
  ioredis:connection set the connection to readonly mode +0ms
  ioredis:redis write command[0] -> readonly() +1ms
  ioredis:redis status[127.0.0.1:6401]: connect -> ready +2ms
  ioredis:connection set the connection to readonly mode +2ms
  ioredis:redis write command[0] -> readonly() +0ms
  ioredis:redis status[127.0.0.1:6421]: connect -> ready +1ms
  ioredis:connection set the connection to readonly mode +1ms
  ioredis:redis write command[0] -> readonly() +0ms
^C