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druid

架构

druid-architecture

  1. coordinator
  2. overlord
  3. broker
  4. historical
  5. middleManager
  6. peon

外部依赖

  1. zk (view of the cluster: data topology)
  2. mysql
  3. hdfs

查询类型

  1. TimeSeries
  2. TopN
  3. GroupBy
  4. Time Boundary
  5. Search
  6. Select

查询的构成

  1. query type
  2. granularity
  3. filter
  4. aggregation
  5. post-aggregation

数据格式

timestamp与metric都是array of int of floating point (LZ4压缩)

dimension要稍微复杂一点，由以下三种数据结构构成

  1. A dictionary that maps values (which are always treated as strings) to integer IDs,
  2. A list of the column’s values, encoded using the dictionary in 1, and
  3. For each distinct value in the column, a bitmap that indicates which rows contain that value. (也被称为倒排)

示例

druid-example

dimension的格式

倒排

字符串类型的倒排索引

Segment