Node.js 诺德斯和卡夫卡关键的分裂者

我试图在4分区主题上使用kafka Highlevelproducer的键控分区 我的代码如下：

   var kafka = require('kafka-node'),
      HighLevelProducer = kafka.HighLevelProducer,
      client = new kafka.Client(Host+":"+Port,client_id),
      producer = new HighLevelProducer(client,{partitionerType: 3});
.
.
   theKey = theKey+1;
   if ( theKey > Nb_key ) {
      theKey = 0;
   }
   var payloads = [
        { topic: Topic, key: theKey, messages: JSON.stringify({"hello": "world", "Timestamp": +timestamp}) }
      ];
      producer.send(payloads, function (err, data) {
      });

   var MyPartitioner = function (partitions, key) {
   key = key || '0';
   var index = parseInt(key) % partitions.length;
   return partitions[index];
   };
   var kafka = require('kafka-node'),
      HighLevelProducer = kafka.HighLevelProducer,
      client = new kafka.Client(Host+":"+Port,client_id),
      producer = new HighLevelProducer(client,{requireAcks: 0,partitionerType: 4},MyPartitioner );
      producer.on('ready', function () {
      timer.setInterval(send_data, '',SendIntervalInUsecs+'u');
   });

我检查了消息是否具有正确的键值，但仍然将所有消息发送到分区1。 你觉得我做的有什么不对吗

---

谢谢查看代码，我想我理解了这个问题。 baseProducer将密钥作为字符串进行散列，结果总是相同的，因此总是相同的分区。 我编写了自己的自定义分区器，使用nb分区对键进行简单的模运算，它工作得非常完美。 见下面的代码：

   var kafka = require('kafka-node'),
      HighLevelProducer = kafka.HighLevelProducer,
      client = new kafka.Client(Host+":"+Port,client_id),
      producer = new HighLevelProducer(client,{partitionerType: 3});
.
.
   theKey = theKey+1;
   if ( theKey > Nb_key ) {
      theKey = 0;
   }
   var payloads = [
        { topic: Topic, key: theKey, messages: JSON.stringify({"hello": "world", "Timestamp": +timestamp}) }
      ];
      producer.send(payloads, function (err, data) {
      });

   var MyPartitioner = function (partitions, key) {
   key = key || '0';
   var index = parseInt(key) % partitions.length;
   return partitions[index];
   };
   var kafka = require('kafka-node'),
      HighLevelProducer = kafka.HighLevelProducer,
      client = new kafka.Client(Host+":"+Port,client_id),
      producer = new HighLevelProducer(client,{requireAcks: 0,partitionerType: 4},MyPartitioner );
      producer.on('ready', function () {
      timer.setInterval(send_data, '',SendIntervalInUsecs+'u');
   });

---

看看代码，我想我理解了这个问题。 baseProducer将密钥作为字符串进行散列，结果总是相同的，因此总是相同的分区。 我编写了自己的自定义分区器，使用nb分区对键进行简单的模运算，它工作得非常完美。 见下面的代码：

   var kafka = require('kafka-node'),
      HighLevelProducer = kafka.HighLevelProducer,
      client = new kafka.Client(Host+":"+Port,client_id),
      producer = new HighLevelProducer(client,{partitionerType: 3});
.
.
   theKey = theKey+1;
   if ( theKey > Nb_key ) {
      theKey = 0;
   }
   var payloads = [
        { topic: Topic, key: theKey, messages: JSON.stringify({"hello": "world", "Timestamp": +timestamp}) }
      ];
      producer.send(payloads, function (err, data) {
      });

   var MyPartitioner = function (partitions, key) {
   key = key || '0';
   var index = parseInt(key) % partitions.length;
   return partitions[index];
   };
   var kafka = require('kafka-node'),
      HighLevelProducer = kafka.HighLevelProducer,
      client = new kafka.Client(Host+":"+Port,client_id),
      producer = new HighLevelProducer(client,{requireAcks: 0,partitionerType: 4},MyPartitioner );
      producer.on('ready', function () {
      timer.setInterval(send_data, '',SendIntervalInUsecs+'u');
   });