Spark streaming kafka OffsetOutOfRangeException 异常分析与解决

最新推荐文章于 2025-01-25 00:07:51 发布

XiaoGuang-Xu

最新推荐文章于 2025-01-25 00:07:51 发布

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Spark streaming kafka OffsetOutOfRangeException 异常分析与解决

原文地址：

http://blog.youkuaiyun.com/xueba207/article/details/51174818

自从把Spark 从1.3升级到1.6之后，kafka Streaming相关问题频出。最近又遇到了一个。
job中使用Kafka DirectStream 读取topic中数据，然后做处理。其中有个测试job，停止了几天，再次启动时爆出了kafka.common.OffsetOutOfRangeException。下文记录下异常分析与解决过程。

异常分析

从字面意思上，说是kafka topic的offset越界异常；在job中使用的是Kafka DirectStream，每成功处理一批数据，就把对应的offset更新到zookeeper中；和数组越界异常一样，offset越界应该分为头越界和尾越界，如下图所示。
越界示意图

头部越界： zookeeper中保存的offset在topic中仍然存在的最老message的offset之前时(zk_offset < earliest_offset)；
尾部越界： zookeeper中保存的offset在topic中最新message的offset之后时(zk_offset > last_offset)

因为代码中采用了之前文章的方法，因此不可能是尾部越界，因此猜测是头部越界。
是什么导致头部越界呢？
考虑到kafka broker配置中修改了message的保持时间为24小时：

log.retention.hours=24(The minimum age of a log file to be eligible for deletion)

因此，应该是kafka 中未被消费的数据被broker清除了，使得zk中的offset落在仍存在的最老message offset的左侧，本来合法的offset变得不非法了。

验证猜测

改kafka broker 的retention time 为2分钟
配置文件
kafka/config/server.properties
log.retention.hours=168 -> log.retention.minutes=2
修改完成后重启kafka。
使用zk shell 命令得到解析器所保存的zk_offset
停止spark streaming kafka DirectStream job
发送数据到kafka topic，等待一段时间（超过两分钟）
启动streaming job，复现该异常。

通过异常验证可以导致异常的原因为：kafka broker因为log.retention.hours的配置，导致topic中有些数据被清除，而在retention时间范围内streaming job都没有把将要被清除的message消费掉，因此zk中offset落在了earliest_offset的左侧，引发异常。

解决方法

首先想到的方法就是 streaming job要及时消费掉topic中的数据，消费延迟不得大于log.retention.time的配置。
但是更好的办法是在遇到该问题时，依然能让job正常运行，因此就需要在发现zk_offset<earliest_offset时矫正zk_offset为合法值。
同样使用Spark Streaming ‘numRecords must not be negative’问题解决，解决思路的方法。
代码：

package com.frey.v1.utils.kafka;

import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import kafka.api.PartitionOffsetRequestInfo;
import kafka.cluster.Broker;
import kafka.common.TopicAndPartition;
import kafka.javaapi.*;
import kafka.javaapi.consumer.SimpleConsumer;

import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * KafkaOffsetTool
 *
 * @author FREY
 * @date 2016/4/11
 */
public class KafkaOffsetTool {

  private static KafkaOffsetTool instance;
  final int TIMEOUT = 100000;
  final int BUFFERSIZE = 64 * 1024;

  private KafkaOffsetTool() {
  }

  public static synchronized KafkaOffsetTool getInstance() {
    if (instance == null) {
      instance = new KafkaOffsetTool();
    }
    return instance;
  }

public Map<TopicAndPartition, Long> getLastOffset(String brokerList, List<String> topics,
      String groupId) {

    Map<TopicAndPartition, Long> topicAndPartitionLongMap = Maps.newHashMap();

    Map<TopicAndPartition, Broker> topicAndPartitionBrokerMap =
        KafkaOffsetTool.getInstance().findLeader(brokerList, topics);

    for (Map.Entry<TopicAndPartition, Broker> topicAndPartitionBrokerEntry : topicAndPartitionBrokerMap
        .entrySet()) {
      // get leader broker
      Broker leaderBroker = topicAndPartitionBrokerEntry.getValue();

      SimpleConsumer simpleConsumer = new SimpleConsumer(leaderBroker.host(), leaderBroker.port(),
          TIMEOUT, BUFFERSIZE, groupId);

      long readOffset = getTopicAndPartitionLastOffset(simpleConsumer,
          topicAndPartitionBrokerEntry.getKey(), groupId);

      topicAndPartitionLongMap.put(topicAndPartitionBrokerEntry.getKey(), readOffset);

    }

    return topicAndPartitionLongMap;

  }

  /**
   *
   * @param brokerList
   * @param topics
   * @param groupId
   * @return
   */
  public Map<TopicAndPartition, Long> getEarliestOffset(String brokerList, List<String> topics,
      String groupId) {

    Map<TopicAndPartition, Long> topicAndPartitionLongMap = Maps.newHashMap();

    Map<TopicAndPartition, Broker> topicAndPartitionBrokerMap =
        KafkaOffsetTool.getInstance().findLeader(brokerList, topics);

    for (Map.Entry<TopicAndPartition, Broker> topicAndPartitionBrokerEntry : topicAndPartitionBrokerMap
        .entrySet()) {
      // get leader broker
      Broker leaderBroker = topicAndPartitionBrokerEntry.getValue();

      SimpleConsumer simpleConsumer = new SimpleConsumer(leaderBroker.host(), leaderBroker.port(),
          TIMEOUT, BUFFERSIZE, groupId);

      long readOffset = getTopicAndPartitionEarliestOffset(simpleConsumer,
          topicAndPartitionBrokerEntry.getKey(), groupId);

      topicAndPartitionLongMap.put(topicAndPartitionBrokerEntry.getKey(), readOffset);

    }

    return topicAndPartitionLongMap;

  }

  /**
   * 得到所有的 TopicAndPartition
   *
   * @param brokerList
   * @param topics
   * @return topicAndPartitions
   */
  private Map<TopicAndPartition, Broker> findLeader(String brokerList, List<String> topics) {
    // get broker's url array
    String[] brokerUrlArray = getBorkerUrlFromBrokerList(brokerList);
    // get broker's port map
    Map<String, Integer> brokerPortMap = getPortFromBrokerList(brokerList);

    // create array list of TopicAndPartition
    Map<TopicAndPartition, Broker> topicAndPartitionBrokerMap = Maps.newHashMap();

    for (String broker : brokerUrlArray) {

      SimpleConsumer consumer = null;
      try {
        // new instance of simple Consumer
        consumer = new SimpleConsumer(broker, brokerPortMap.get(broker), TIMEOUT, BUFFERSIZE,
            "leaderLookup" + new Date().getTime());

        TopicMetadataRequest req = new TopicMetadataRequest(topics);

        TopicMetadataResponse resp = consumer.send(req);

        List<TopicMetadata> metaData = resp.topicsMetadata();

        for (TopicMetadata item : metaData) {
          for (PartitionMetadata part : item.partitionsMetadata()) {
            TopicAndPartition topicAndPartition =
                new TopicAndPartition(item.topic(), part.partitionId());
            topicAndPartitionBrokerMap.put(topicAndPartition, part.leader());
          }
        }
      } catch (Exception e) {
        e.printStackTrace();
      } finally {
        if (consumer != null)
          consumer.close();
      }
    }
    return topicAndPartitionBrokerMap;
  }

  /**
   * get last offset
   * @param consumer
   * @param topicAndPartition
   * @param clientName
   * @return
   */
  private long getTopicAndPartitionLastOffset(SimpleConsumer consumer,
      TopicAndPartition topicAndPartition, String clientName) {
    Map<TopicAndPartition, PartitionOffsetRequestInfo> requestInfo =
        new HashMap<TopicAndPartition, PartitionOffsetRequestInfo>();

    requestInfo.put(topicAndPartition, new PartitionOffsetRequestInfo(
        kafka.api.OffsetRequest.LatestTime(), 1));

    OffsetRequest request = new OffsetRequest(
        requestInfo, kafka.api.OffsetRequest.CurrentVersion(),
        clientName);

    OffsetResponse response = consumer.getOffsetsBefore(request);

    if (response.hasError()) {
      System.out
          .println("Error fetching data Offset Data the Broker. Reason: "
              + response.errorCode(topicAndPartition.topic(), topicAndPartition.partition()));
      return 0;
    }
    long[] offsets = response.offsets(topicAndPartition.topic(), topicAndPartition.partition());
    return offsets[0];
  }

  /**
   * get earliest offset
   * @param consumer
   * @param topicAndPartition
   * @param clientName
   * @return
   */
  private long getTopicAndPartitionEarliestOffset(SimpleConsumer consumer,
      TopicAndPartition topicAndPartition, String clientName) {
    Map<TopicAndPartition, PartitionOffsetRequestInfo> requestInfo =
        new HashMap<TopicAndPartition, PartitionOffsetRequestInfo>();

    requestInfo.put(topicAndPartition, new PartitionOffsetRequestInfo(
        kafka.api.OffsetRequest.EarliestTime(), 1));

    OffsetRequest request = new OffsetRequest(
        requestInfo, kafka.api.OffsetRequest.CurrentVersion(),
        clientName);

    OffsetResponse response = consumer.getOffsetsBefore(request);

    if (response.hasError()) {
      System.out
          .println("Error fetching data Offset Data the Broker. Reason: "
              + response.errorCode(topicAndPartition.topic(), topicAndPartition.partition()));
      return 0;
    }
    long[] offsets = response.offsets(topicAndPartition.topic(), topicAndPartition.partition());
    return offsets[0];
  }
  /**
   * 得到所有的broker url
   *
   * @param brokerlist
   * @return
   */
  private String[] getBorkerUrlFromBrokerList(String brokerlist) {
    String[] brokers = brokerlist.split(",");
    for (int i = 0; i < brokers.length; i++) {
      brokers[i] = brokers[i].split(":")[0];
    }
    return brokers;
  }

  /**
   * 得到broker url 与 其port 的映射关系
   *
   * @param brokerlist
   * @return
   */
  private Map<String, Integer> getPortFromBrokerList(String brokerlist) {
    Map<String, Integer> map = new HashMap<String, Integer>();
    String[] brokers = brokerlist.split(",");
    for (String item : brokers) {
      String[] itemArr = item.split(":");
      if (itemArr.length > 1) {
        map.put(itemArr[0], Integer.parseInt(itemArr[1]));
      }
    }
    return map;
  }

  public static void main(String[] args) {
    List<String> topics = Lists.newArrayList();
    topics.add("my_topic");
//    topics.add("bugfix");
    Map<TopicAndPartition, Long> topicAndPartitionLongMap =
        KafkaOffsetTool.getInstance().getEarliestOffset("broker1:9092,broker2:9092", topics,
            "com.frey.group");

    for (Map.Entry<TopicAndPartition, Long> entry : topicAndPartitionLongMap.entrySet()) {
     System.out.println(entry.getKey().topic() + "-"+ entry.getKey().partition() + ":" + entry.getValue());
    }
  }
}

 
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矫正offset核心代码：

/** 以下 矫正 offset */

    // lastest offsets
    Map<TopicAndPartition, Long> lastestTopicAndPartitionLongMap =
        KafkaOffsetTool.getInstance().getLastOffset(kafkaParams.get("metadata.broker.list"),
            Lists.newArrayList(topicsSet), kafkaParams.get(Constants.KAFKA_CONSUMER_GROUP_ID));

    // earliest offsets
    Map<TopicAndPartition, Long> earliestTopicAndPartitionLongMap =
        KafkaOffsetTool.getInstance().getEarliestOffset(kafkaParams.get("metadata.broker.list"),
            Lists.newArrayList(topicsSet), kafkaParams.get(Constants.KAFKA_CONSUMER_GROUP_ID));


    for (Map.Entry<TopicAndPartition, Long> topicAndPartitionLongEntry : fromOffsets.entrySet()) {

      long zkOffset = topicAndPartitionLongEntry.getValue();
      long lastestOffset = lastestTopicAndPartitionLongMap.get(topicAndPartitionLongEntry.getKey());
      long earliestOffset = earliestTopicAndPartitionLongMap.get(topicAndPartitionLongEntry.getKey());
      // zkoffset 不在可用message offset区间内
      if (zkOffset > lastestOffset || zkOffset < earliestOffset) {
        // set offset = earliestOffset
        logger.warn("矫正offset: " + zkOffset +" -> "+ earliestOffset);
        topicAndPartitionLongEntry.setValue(earliestOffset);
      }
    }
    /** 以上 矫正 offset */