Comparing Spark and MapReducei, which of the following statements are correct?

• A.Shuffle is not a necessary process in Spark tasks
• B.Spark can cache intermediate results in memory reducing disk I0
• C.Intermediate results of Spark tasks can only be stored in memory
• D.Shuffle is a necessary process in Spark tasks

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Fusioninsight Spark SQL, like the community Spark JDBCServer, only supports single-tenant binding to a YARN resource queue and multi-tenancy, and does not support multi-tenant parallel execution.

• A.True
• B.False

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FLINK adopts the checkpoint mechanism to ensure fault tolerance in the running of applications.

• A.False
• B.True

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The memory size allocated by YARN to the Container in the Hadoop system can be set by the parameter yarn.app.mapreduce am.resource.mb.

• A.True
• B.False

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Which of the following descriptions about HBase secondary indexes is correct?

• A.All of the above are correct
• B.The secondary index associates the column to be searched with the rowkey into an index table
• C.Now it is listed as the new rowkey, and the original rowkey becomes the value
• D.The secondary index was queried 2 times

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