Merge pull request #415 from CartoDB/avoid-scan-to-discover-queues

Avoid scan command to discover queues

batch/batch.js

@@ -8,14 +8,17 @@ var HostScheduler = require('./scheduler/host-scheduler');
 
 var EMPTY_QUEUE = true;
 
-function Batch(name, jobSubscriber, jobQueue, jobRunner, jobService, jobPublisher, redisPool, logger) {
+var MINUTE = 60 * 1000;
+var SCHEDULE_INTERVAL = 1 * MINUTE;
+
+function Batch(name, userDatabaseMetadataService, jobSubscriber, jobQueue, jobRunner, jobService, redisPool, logger) {
     EventEmitter.call(this);
     this.name = name || 'batch';
+    this.userDatabaseMetadataService = userDatabaseMetadataService;
     this.jobSubscriber = jobSubscriber;
     this.jobQueue = jobQueue;
     this.jobRunner = jobRunner;
     this.jobService = jobService;
-    this.jobPublisher = jobPublisher;
     this.logger = logger;
     this.hostScheduler = new HostScheduler(this.name, { run: this.processJob.bind(this) }, redisPool);
 
@@ -28,31 +31,70 @@ module.exports = Batch;
 
 Batch.prototype.start = function () {
     var self = this;
+    var onJobHandler = createJobHandler(self.name, self.userDatabaseMetadataService, self.hostScheduler);
 
-    this.jobSubscriber.subscribe(
+    self.jobQueue.scanQueues(function (err, queues) {
-        function onJobHandler(user, host) {
-            debug('[%s] onJobHandler(%s, %s)', self.name, user, host);
-            self.hostScheduler.add(host, user, function(err) {
         if (err) {
-                    return debug(
+            return self.emit('error', err);
-                        'Could not schedule host=%s user=%s from %s. Reason: %s',
-                        host, self.name, user, err.message
-                    );
         }
-            });
+
-        },
+        queues.forEach(onJobHandler);
-        function onJobSubscriberReady(err) {
+        self._startScheduleInterval(onJobHandler);
+
+        self.jobSubscriber.subscribe(onJobHandler, function (err) {
             if (err) {
                 return self.emit('error', err);
             }
 
             self.emit('ready');
+        });
+    });
+};
+
+function createJobHandler (name, userDatabaseMetadataService, hostScheduler) {
+    return function onJobHandler(user) {
+        userDatabaseMetadataService.getUserMetadata(user, function (err, userDatabaseMetadata) {
+            if (err) {
+                return debug('Could not get host user=%s from %s. Reason: %s', user, name, err.message);
             }
+
+            var host = userDatabaseMetadata.host;
+
+            debug('[%s] onJobHandler(%s, %s)', name, user, host);
+            hostScheduler.add(host, user, function(err) {
+                if (err) {
+                    return debug(
+                        'Could not schedule host=%s user=%s from %s. Reason: %s', host, user, name, err.message
                     );
+                }
+            });
+        });
+    };
+}
+
+Batch.prototype._startScheduleInterval = function (onJobHandler) {
+    var self = this;
+
+    self.scheduleInterval = setInterval(function () {
+        self.jobQueue.getQueues(function (err, queues) {
+            if (err) {
+                return debug('Could not get queues from %s. Reason: %s', self.name, err.message);
+            }
+
+            queues.forEach(onJobHandler);
+        });
+    }, SCHEDULE_INTERVAL);
+};
+
+Batch.prototype._stopScheduleInterval = function () {
+    if (this.scheduleInterval) {
+        clearInterval(this.scheduleInterval);
+    }
 };
 
 Batch.prototype.processJob = function (user, callback) {
     var self = this;
+
     self.jobQueue.dequeue(user, function (err, jobId) {
         if (err) {
             return callback(new Error('Could not get job from "' + user + '". Reason: ' + err.message), !EMPTY_QUEUE);
@@ -149,6 +191,7 @@ Batch.prototype._drainJob = function (user, callback) {
 
 Batch.prototype.stop = function (callback) {
     this.removeAllListeners();
+    this._stopScheduleInterval();
     this.jobSubscriber.unsubscribe(callback);
 };
 

batch/index.js

@@ -15,7 +15,7 @@ var Batch = require('./batch');
 module.exports = function batchFactory (metadataBackend, redisPool, name, statsdClient, loggerPath) {
     var userDatabaseMetadataService = new UserDatabaseMetadataService(metadataBackend);
 
-    var jobSubscriber = new JobSubscriber(redisPool, userDatabaseMetadataService);
+    var jobSubscriber = new JobSubscriber(redisPool);
     var jobPublisher = new JobPublisher(redisPool);
 
     var jobQueue =  new JobQueue(metadataBackend, jobPublisher);
@@ -28,11 +28,11 @@ module.exports = function batchFactory (metadataBackend, redisPool, name, statsd
 
     return new Batch(
         name,
+        userDatabaseMetadataService,
         jobSubscriber,
         jobQueue,
         jobRunner,
         jobService,
-        jobPublisher,
         redisPool,
         logger
     );

batch/job_queue.js

@@ -1,6 +1,7 @@
 'use strict';
 
 var debug = require('./util/debug')('queue');
+var queueAsync = require('queue-async');
 
 function JobQueue(metadataBackend, jobPublisher) {
     this.metadataBackend = metadataBackend;
@@ -11,13 +12,19 @@ module.exports = JobQueue;
 
 var QUEUE = {
     DB: 5,
-    PREFIX: 'batch:queue:'
+    PREFIX: 'batch:queue:',
+    INDEX: 'batch:indexes:queue'
 };
+
 module.exports.QUEUE = QUEUE;
 
 JobQueue.prototype.enqueue = function (user, jobId, callback) {
     debug('JobQueue.enqueue user=%s, jobId=%s', user, jobId);
-    this.metadataBackend.redisCmd(QUEUE.DB, 'LPUSH', [ QUEUE.PREFIX + user, jobId ], function (err) {
+
+    this.metadataBackend.redisMultiCmd(QUEUE.DB, [
+        [ 'LPUSH', QUEUE.PREFIX + user, jobId ],
+        [ 'SADD', QUEUE.INDEX, user ]
+    ], function (err) {
         if (err) {
             return callback(err);
         }
@@ -32,7 +39,23 @@ JobQueue.prototype.size = function (user, callback) {
 };
 
 JobQueue.prototype.dequeue = function (user, callback) {
-    this.metadataBackend.redisCmd(QUEUE.DB, 'RPOP', [ QUEUE.PREFIX + user ], function(err, jobId) {
+    var dequeueScript = [
+        'local job_id = redis.call("RPOP", KEYS[1])',
+        'if redis.call("LLEN", KEYS[1]) == 0 then',
+        '   redis.call("SREM", KEYS[2], ARGV[1])',
+        'end',
+        'return job_id'
+    ].join('\n');
+
+    var redisParams = [
+        dequeueScript, //lua source code
+        2, // Two "keys" to pass
+        QUEUE.PREFIX + user, //KEYS[1], the key of the queue
+        QUEUE.INDEX, //KEYS[2], the key of the index
+        user // ARGV[1] - value of the element to remove from the index
+    ];
+
+    this.metadataBackend.redisCmd(QUEUE.DB, 'EVAL', redisParams, function (err, jobId) {
         debug('JobQueue.dequeued user=%s, jobId=%s', user, jobId);
         return callback(err, jobId);
     });
@@ -42,3 +65,91 @@ JobQueue.prototype.enqueueFirst = function (user, jobId, callback) {
     debug('JobQueue.enqueueFirst user=%s, jobId=%s', user, jobId);
     this.metadataBackend.redisCmd(QUEUE.DB, 'RPUSH', [ QUEUE.PREFIX + user, jobId ], callback);
 };
+
+
+JobQueue.prototype.getQueues = function (callback) {
+    this.metadataBackend.redisCmd(QUEUE.DB, 'SMEMBERS', [ QUEUE.INDEX ], function (err, queues) {
+        if (err) {
+            return callback(err);
+        }
+
+        callback(null, queues);
+    });
+};
+
+JobQueue.prototype.scanQueues = function (callback) {
+    var self = this;
+
+    self.scan(function (err, queues) {
+        if (err) {
+            return callback(err);
+        }
+
+        self.addToQueueIndex(queues, function (err) {
+            if (err) {
+                return callback(err);
+            }
+
+            callback(null, queues);
+        });
+    });
+};
+
+JobQueue.prototype.scan = function (callback) {
+    var self = this;
+    var initialCursor = ['0'];
+    var users = {};
+
+    self._scan(initialCursor, users, function(err, users) {
+        if (err) {
+            return callback(err);
+        }
+
+        callback(null, Object.keys(users));
+    });
+};
+
+JobQueue.prototype._scan = function (cursor, users, callback) {
+    var self = this;
+    var redisParams = [cursor[0], 'MATCH', QUEUE.PREFIX + '*'];
+
+    self.metadataBackend.redisCmd(QUEUE.DB, 'SCAN', redisParams, function (err, currentCursor) {
+        if (err) {
+            return callback(null, users);
+        }
+
+        var queues = currentCursor[1];
+        if (queues) {
+            queues.forEach(function (queue) {
+                var user = queue.substr(QUEUE.PREFIX.length);
+                users[user] = true;
+            });
+        }
+
+        var hasMore = currentCursor[0] !== '0';
+        if (!hasMore) {
+            return callback(null, users);
+        }
+
+        self._scan(currentCursor, users, callback);
+    });
+};
+
+JobQueue.prototype.addToQueueIndex = function (users, callback) {
+    var self = this;
+    var usersQueues = queueAsync(users.length);
+
+    users.forEach(function (user) {
+        usersQueues.defer(function (user, callback) {
+            self.metadataBackend.redisCmd(QUEUE.DB, 'SADD', [ QUEUE.INDEX, user], callback);
+        }, user);
+    });
+
+    usersQueues.awaitAll(function (err) {
+        if (err) {
+            return callback(err);
+        }
+
+        callback(null);
+    });
+};

batch/pubsub/job-subscriber.js

@@ -1,60 +1,23 @@
 'use strict';
 
 var Channel = require('./channel');
-var QueueSeeker = require('./queue-seeker');
 var debug = require('./../util/debug')('pubsub:subscriber');
 var error = require('./../util/debug')('pubsub:subscriber:error');
 
-var MINUTE = 60 * 1000;
+function JobSubscriber(pool) {
-var SUBSCRIBE_INTERVAL = 5 * MINUTE;
-
-function JobSubscriber(pool, userDatabaseMetadataService) {
     this.pool = pool;
-    this.userDatabaseMetadataService = userDatabaseMetadataService;
-    this.queueSeeker = new QueueSeeker(pool);
 }
 
 module.exports = JobSubscriber;
 
-function seeker(queueSeeker, onJobHandler, callback) {
-    queueSeeker.seek(function (err, users) {
-        if (err) {
-            if (callback) {
-                callback(err);
-            }
-            return error(err);
-        }
-        debug('queues found successfully');
-        users.forEach(onJobHandler);
-
-        if (callback) {
-            return callback(null);
-        }
-    });
-}
-
 JobSubscriber.prototype.subscribe = function (onJobHandler, callback) {
     var self = this;
 
-    function wrappedJobHandlerListener(user) {
+    self.pool.acquire(Channel.DB, function(err, client) {
-        self.userDatabaseMetadataService.getUserMetadata(user, function (err, userDatabaseMetadata) {
         if (err) {
-                return callback(err);
-            }
-            return onJobHandler(user, userDatabaseMetadata.host);
-        });
-    }
-
-    seeker(this.queueSeeker, wrappedJobHandlerListener, function(err) {
             if (callback) {
                 callback(err);
             }
-
-        // do not start any pooling until first seek has finished
-        self.seekerInterval = setInterval(seeker, SUBSCRIBE_INTERVAL, self.queueSeeker, wrappedJobHandlerListener);
-
-        self.pool.acquire(Channel.DB, function (err, client) {
-            if (err) {
             return error('Error adquiring redis client: ' + err.message);
         }
 
@@ -65,7 +28,7 @@ JobSubscriber.prototype.subscribe = function (onJobHandler, callback) {
 
         client.on('message', function (channel, user) {
             debug('message received in channel=%s from user=%s', channel, user);
-                wrappedJobHandlerListener(user);
+            onJobHandler(user);
         });
 
         client.on('error', function () {
@@ -73,12 +36,14 @@ JobSubscriber.prototype.subscribe = function (onJobHandler, callback) {
             self.pool.release(Channel.DB, client);
             self.subscribe(onJobHandler);
         });
-        });
+
+        if (callback) {
+            callback();
+        }
     });
 };
 
 JobSubscriber.prototype.unsubscribe = function (callback) {
-    clearInterval(this.seekerInterval);
     if (this.client && this.client.connected) {
         this.client.unsubscribe(Channel.NAME, callback);
     } else {

batch/pubsub/queue-seeker.js

@@ -1,51 +0,0 @@
-'use strict';
-
-var QUEUE = require('../job_queue').QUEUE;
-
-function QueueSeeker(pool) {
-    this.pool = pool;
-}
-
-module.exports = QueueSeeker;
-
-QueueSeeker.prototype.seek = function (callback) {
-    var initialCursor = ['0'];
-    var users = {};
-    var self = this;
-
-    this.pool.acquire(QUEUE.DB, function(err, client) {
-        if (err) {
-            return callback(err);
-        }
-        self._seek(client, initialCursor, users, function(err, users) {
-            self.pool.release(QUEUE.DB, client);
-            return callback(err, Object.keys(users));
-        });
-    });
-};
-
-QueueSeeker.prototype._seek = function (client, cursor, users, callback) {
-    var self = this;
-    var redisParams = [cursor[0], 'MATCH', QUEUE.PREFIX + '*'];
-
-    client.scan(redisParams, function(err, currentCursor) {
-        if (err) {
-            return callback(null, users);
-        }
-
-        var queues = currentCursor[1];
-        if (queues) {
-            queues.forEach(function (queue) {
-                var user = queue.substr(QUEUE.PREFIX.length);
-                users[user] = true;
-            });
-        }
-
-        var hasMore = currentCursor[0] !== '0';
-        if (!hasMore) {
-            return callback(null, users);
-        }
-
-        self._seek(client, currentCursor, users, callback);
-    });
-};

test/integration/batch/job-queue.test.js

@@ -0,0 +1,181 @@
+'use strict';
+
+require('../../helper');
+var assert = require('../../support/assert');
+var redisUtils = require('../../support/redis_utils');
+
+var metadataBackend = require('cartodb-redis')({ pool: redisUtils.getPool() });
+var JobPublisher = require('../../../batch/pubsub/job-publisher');
+var JobQueue = require('../../../batch/job_queue');
+
+var JobBackend = require('../../../batch/job_backend');
+var JobService = require('../../../batch/job_service');
+var UserDatabaseMetadataService = require('../../../batch/user_database_metadata_service');
+var JobCanceller = require('../../../batch/job_canceller');
+var metadataBackend = require('cartodb-redis')({ pool: redisUtils.getPool() });
+
+describe('job queue', function () {
+    var pool = redisUtils.getPool();
+    var jobPublisher = new JobPublisher(pool);
+    var jobQueue =  new JobQueue(metadataBackend, jobPublisher);
+    var jobBackend = new JobBackend(metadataBackend, jobQueue);
+    var userDatabaseMetadataService = new UserDatabaseMetadataService(metadataBackend);
+    var jobCanceller = new JobCanceller(userDatabaseMetadataService);
+    var jobService = new JobService(jobBackend, jobCanceller);
+
+    var userA = 'userA';
+    var userB = 'userB';
+
+    beforeEach(function () {
+        this.jobQueue = new JobQueue(metadataBackend, jobPublisher);
+    });
+
+    afterEach(function (done) {
+        redisUtils.clean('batch:*', done);
+    });
+
+    it('should find queues for one user', function (done) {
+        var self = this;
+
+        this.jobQueue.enqueue(userA, 'wadus-wadus-wadus-wadus', function(err) {
+            if (err) {
+                return done(err);
+            }
+
+            self.jobQueue.scanQueues(function (err, queues) {
+                assert.ifError(err);
+                assert.equal(queues.length, 1);
+                assert.equal(queues[0], userA);
+                return done();
+            });
+        });
+    });
+
+    it('should find queues for more than one user', function (done) {
+        var self = this;
+
+        this.jobQueue.enqueue(userA, 'wadus-wadus-wadus-wadus', function(err) {
+            if (err) {
+                return done(err);
+            }
+            self.jobQueue.enqueue(userB, 'wadus-wadus-wadus-wadus', function(err) {
+                if (err) {
+                    return done(err);
+                }
+
+                self.jobQueue.scanQueues(function (err, queues) {
+                    assert.ifError(err);
+                    assert.equal(queues.length, 2);
+                    assert.ok(queues[0] === userA || queues[0] === userB);
+                    assert.ok(queues[1] === userA || queues[1] === userB);
+
+                    return done();
+                });
+            });
+        });
+    });
+
+    it('should find queues from jobs not using new Redis SETs for users', function(done) {
+        var self = this;
+        var redisArgs = [JobQueue.QUEUE.PREFIX + userA, 'wadus-id'];
+        metadataBackend.redisCmd(JobQueue.QUEUE.DB, 'LPUSH', redisArgs, function (err) {
+            assert.ok(!err, err);
+            self.jobQueue.scanQueues(function (err, queues) {
+                assert.ok(!err, err);
+
+                assert.equal(queues.length, 1);
+                assert.equal(queues[0], userA);
+
+                return done();
+            });
+        });
+    });
+
+    it('.scanQueues() should feed queue index', function (done) {
+        var self = this;
+
+        var data = {
+            user: 'vizzuality',
+            query: 'select 1 as cartodb_id',
+            host: 'localhost'
+        };
+
+        jobService.create(data, function (err) {
+            if (err) {
+                return done(err);
+            }
+
+            self.jobQueue.scanQueues(function (err, queuesFromScan) {
+                if (err) {
+                    return done(err);
+                }
+
+                assert.equal(queuesFromScan.length, 1);
+                assert.ok(queuesFromScan.indexOf(data.user) >= 0);
+
+                self.jobQueue.getQueues(function (err, queuesFromIndex) {
+                    if (err) {
+                        done(err);
+                    }
+
+                    assert.equal(queuesFromIndex.length, 1);
+                    assert.ok(queuesFromIndex.indexOf(data.user) >= 0);
+
+                    redisUtils.clean('batch:*', done);
+                });
+
+            });
+        });
+    });
+
+    it('.scanQueues() should feed queue index with two users', function (done) {
+        var self = this;
+
+        var jobVizzuality = {
+            user: 'vizzuality',
+            query: 'select 1 as cartodb_id',
+            host: 'localhost'
+        };
+
+        var jobWadus = {
+            user: 'wadus',
+            query: 'select 1 as cartodb_id',
+            host: 'localhost'
+        };
+
+        jobService.create(jobVizzuality, function (err) {
+            if (err) {
+                return done(err);
+            }
+
+            jobService.create(jobWadus, function (err) {
+                if (err) {
+                    return done(err);
+                }
+
+                self.jobQueue.scanQueues(function (err, queuesFromScan) {
+                    if (err) {
+                        return done(err);
+                    }
+
+                    assert.equal(queuesFromScan.length, 2);
+                    assert.ok(queuesFromScan.indexOf(jobVizzuality.user) >= 0);
+                    assert.ok(queuesFromScan.indexOf(jobWadus.user) >= 0);
+
+                    self.jobQueue.getQueues(function (err, queuesFromIndex) {
+                        if (err) {
+                            done(err);
+                        }
+
+                        assert.equal(queuesFromIndex.length, 2);
+                        assert.ok(queuesFromIndex.indexOf(jobVizzuality.user) >= 0);
+                        assert.ok(queuesFromIndex.indexOf(jobWadus.user) >= 0);
+
+                        redisUtils.clean('batch:*', done);
+                    });
+
+                });
+            });
+        });
+    });
+});

test/integration/batch/queue-seeker.js

@@ -1,65 +0,0 @@
-'use strict';
-
-require('../../helper');
-var assert = require('../../support/assert');
-var redisUtils = require('../../support/redis_utils');
-
-var metadataBackend = require('cartodb-redis')({ pool: redisUtils.getPool() });
-var JobPublisher = require('../../../batch/pubsub/job-publisher');
-var QueueSeeker = require('../../../batch/pubsub/queue-seeker');
-var JobQueue = require('../../../batch/job_queue');
-
-var jobPublisher = new JobPublisher(redisUtils.getPool());
-
-
-describe('queue seeker', function() {
-    var userA = 'userA';
-    var userB = 'userB';
-
-    beforeEach(function () {
-        this.jobQueue = new JobQueue(metadataBackend, jobPublisher);
-    });
-
-    afterEach(function (done) {
-        redisUtils.clean('batch:*', done);
-    });
-
-    it('should find queues for one user', function (done) {
-        var seeker = new QueueSeeker(redisUtils.getPool());
-        this.jobQueue.enqueue(userA, 'wadus-wadus-wadus-wadus', function(err) {
-            if (err) {
-                return done(err);
-            }
-            seeker.seek(function(err, users) {
-                assert.ok(!err);
-                assert.equal(users.length, 1);
-                assert.equal(users[0], userA);
-
-                return done();
-            });
-        });
-    });
-
-    it('should find queues for more than one user', function (done) {
-        var self = this;
-        var seeker = new QueueSeeker(redisUtils.getPool());
-        this.jobQueue.enqueue(userA, 'wadus-wadus-wadus-wadus', function(err) {
-            if (err) {
-                return done(err);
-            }
-            self.jobQueue.enqueue(userB, 'wadus-wadus-wadus-wadus', function(err) {
-                if (err) {
-                    return done(err);
-                }
-                seeker.seek(function(err, users) {
-                    assert.ok(!err);
-                    assert.equal(users.length, 2);
-                    assert.ok(users[0] === userA || users[0] === userB);
-                    assert.ok(users[1] === userA || users[1] === userB);
-
-                    return done();
-                });
-            });
-        });
-    });
-});

test/unit/batch/job_queue.js

@@ -9,6 +9,12 @@ describe('batch API job queue', function () {
                 process.nextTick(function () {
                     callback(null, 'irrelevantJob');
                 });
+            },
+            redisMultiCmd: function () {
+                var callback = arguments[arguments.length -1];
+                process.nextTick(function () {
+                    callback(null, 'irrelevantJob');
+                });
             }
         };
         this.jobPublisher = {

test/unit/batch/job_subscriber.js

@@ -30,7 +30,10 @@ describe('batch API job subscriber', function () {
             removeAllListeners: function () {
                 return this;
             },
-            connected: true
+            smembers: function (key, callback) {
+                callback(null, []);
+            },
+            connected: true,
         };
         this.pool = {
             acquire: function (db, cb) {