The secondary index provides HBase with the ability to index according to the values of certain columns. The secondary index first checks the index table, and then locates the position in the data table, without a full table scan.
Which of the following options is a key feature of the HDFS architecture?
Spark Streaming? The fault tolerance mechanism means that if any partition in the RDD fails, it can be recalculated and generated according to its parent RDD. If the parent RDD is lost, you need to go to the disk to find the original data.
"Group by" in Hive refers to dividing each data set into several small data sets through certain rules, and then grouping data for several small data sets.
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