RocketMQ

在ConsumerOffsetManager中,存储了topic@group 对应的每一个MessageQueue 的offset信息。  【topic@group ->(queueId,offset)】

内存结果如下,采用fastjson进行序列化。

  private ConcurrentHashMap<String/* topic@group */, ConcurrentHashMap<Integer, Long>> offsetTable =
        new ConcurrentHashMap<String, ConcurrentHashMap<Integer, Long>>(512);

在TopicConfigManager 中存储了topic 与TopicConfig信息。 即该broker存储有关topic的元数据。同时存储了版本信息DataVersion

public class TopicConfig {
    private static final String SEPARATOR = " ";
    public static int defaultReadQueueNums = 16;
    public static int defaultWriteQueueNums = 16;
    private String topicName;
    private int readQueueNums = defaultReadQueueNums;
    private int writeQueueNums = defaultWriteQueueNums;
    private int perm = PermName.PERM_READ | PermName.PERM_WRITE;
    private TopicFilterType topicFilterType = TopicFilterType.SINGLE_TAG;
    private int topicSysFlag = 0;
    private boolean order = false;

}

topic内存数据结构如下,采用fastjson序列化。

    private final ConcurrentHashMap<String, TopicConfig> topicConfigTable =
        new ConcurrentHashMap<String, TopicConfig>(1024);
    private final DataVersion dataVersion = new DataVersion();

SubscriptionGroupManager 存储了consumer 的group信息。  groupName->SubscriptionGroupConfig 映射关系。

public class SubscriptionGroupConfig {


    private String groupName;


    private boolean consumeEnable = true;
    private boolean consumeFromMinEnable = true;


    private boolean consumeBroadcastEnable = true;


    private int retryQueueNums = 1;


    private int retryMaxTimes = 16;


    private long brokerId = MixAll.MASTER_ID;


    private long whichBrokerWhenConsumeSlowly = 1;


    private boolean notifyConsumerIdsChangedEnable = true;

}

内存数据结构如下：

    private final ConcurrentHashMap<String, SubscriptionGroupConfig> subscriptionGroupTable =
        new ConcurrentHashMap<String, SubscriptionGroupConfig>(1024);
    private final DataVersion dataVersion = new DataVersion();

ScheduleMessageService  也存储一部分数据结果，目前不详。