Generation process of RDDs

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1. An RDD compatible with Hadoop can be created from the Hadoop file system or other storage systems that are compatible with Hadoop. HDFS is an example.
2. A new RDD can be converted from a parent RDD.
3. An RDD can be converted from a collection.

Other related questions:
How is an RDD generated?
1. An RDD compatible with Hadoop can be created from the Hadoop file system or other storage systems that are compatible with Hadoop. HDFS is an example. 2. A new RDD can be converted from a parent RDD. 3. An RDD can be converted from a collection.

How to obtain CDRs generated on the U1900?
When the U1900 connects to the CDR server, the CDR server obtains CDRs from the CDR pool of the U1900 and clears the CDRs on the U1900.

What is the concept of RDD?
Resilient Distributed Dataset (RDD) is a core concept of Spark. It indicates a read-only distributed dataset that can be partitioned. Partial or all data of this dataset can be cached in the memory and reused in subsequent computations.

How is an RDD formed?
1. An RDD compatible with Hadoop can be created from the Hadoop file system or other storage systems that are compatible with Hadoop. HDFS is an example. 2. A new RDD can be converted from a parent RDD. 3. An RDD can be converted from a collection.

RDD storage modes
1. Users can select different storage levels to cache an RDD for reuse. (There are 11 storage levels for storing an RDD.) 2. The current RDD is stored in the memory by default. When the memory is insufficient, the RDD overflows to the disk.

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