Package com.linkedin.davinci.client

Enum StorageClass

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Comparable<StorageClass>
    public enum StorageClass
extends java.lang.Enum<StorageClass>

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description
      DISK
      The mode has the following implications: 1.
      MEMORY_BACKED_BY_DISK
      The mode has the following implications: 1.

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static StorageClass valueOf​(java.lang.String name)
      Returns the enum constant of this type with the specified name.
      static StorageClass[] values()
      Returns an array containing the constants of this enum type, in the order they are declared.

      • Methods inherited from class java.lang.Enum

        clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

      • Methods inherited from class java.lang.Object

        getClass, notify, notifyAll, wait, wait, wait

    • Enum Constant Detail

      • DISK

        public static final StorageClass DISK
        The mode has the following implications: 1. Keep all the data on disk. 2. Use a block cache to keep the hottest entries and internally it is using LRU algorithm. Internally, Block Cache will try to cache index/bloom filters over data entries if there is a memory pressure. 3. Block cache size is configurable. 4. This mode is recommended for the large store use cases that the application doesn't have enough RAM to keep all the data in memory and the application is using SSD.

      • MEMORY_BACKED_BY_DISK

        public static final StorageClass MEMORY_BACKED_BY_DISK
        The mode has the following implications: 1. Keep a snapshot on disk. 2. Application can use SSD or Hard Drive. 3. Application needs to have enough RAM to keep DaVinci databases fully in RAM (ideally, it should have enough RAM to keep two versions since Venice/DaVinci database is versioned.) 4. At serving time, all the read request will be served out of memory and internally, RocksDB in DaVinci is using mmap to bring the on-disk data files into RAM.

    • Method Detail

      • values

        public static StorageClass[] values()
        Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows: 
        for (StorageClass c : StorageClass.values())
    System.out.println(c);
        Returns:
        an array containing the constants of this enum type, in the order they are declared

      • valueOf

        public static StorageClass valueOf​(java.lang.String name)
        Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
        Parameters:
        name - the name of the enum constant to be returned.
        Returns:
        the enum constant with the specified name
        Throws:
        java.lang.IllegalArgumentException - if this enum type has no constant with the specified name
        java.lang.NullPointerException - if the argument is null