1e tachyon

collections between nodes, or store collections into Tachyon. We can StorageLevel set these storage levels by passing an object to persist() the method. cache()method uses the default storage level- StorageLevel.MEMORY_ONLY . The complete storage level is described below: Storage level meaning memory_only The stores the RDD as a non-serialized Java object in the JVM. If the RDD does not fit in m

space will be occupied. Therefore, you need to generate a spark deployment package in the next step; Spark deployment package Generation Command make-distribution.sh-- Hadoop version: Version Number of hadoop. If this parameter is not added, the hadoop version is 1.0.4.-- With-yarn: whether to support hadoop yarn. If no parameter is added, yarn is not supported.-- With-Hive: whether to support hive in Spark SQL. If this parameter is not added, hive is not supported.-- Skip-Java-test: Indicates

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to disk. Subsequent read memory_and_disk_2 _2 on demand from memory and disk, with each partition backed up to 2 cluster nodes, and the other ibid memory_and_disk_ser similar to Memory_only_ser, Memory-less RDD partition data is persisted to disk, avoids, avoids again when need to recalculate memory_and_disk_ser_2 _2, will backup each partition to 2 cluster nodes, other ibid off_heap off_heap parameter is persisted to the distributed memory file system by default. The memory_only_ser,off_heap r

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