[Bug]: [woodpecker] Many flushes timedout 120s, and one of the streamingNode timetick delay increased periodically #43431 ...

DataNode: A server within HDFS that stores and retrieves actual data blocks, working under the supervision of the NameNode.

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每个 128MB，存到多个 DataNode 中，解决了存储的问题。 • MapReduce 则通过一套代码框架，将数据处理抽象为 map 和 reduce 两个阶段，用户只要实现这两个函数，框架就会将大数据的处理切分成一个个小任务，完成计算。