org.apache.lucene.codecs.memory

## Class DirectDocValuesFormat

- java.lang.Object
- - org.apache.lucene.codecs.DocValuesFormat
  - - org.apache.lucene.codecs.memory.DirectDocValuesFormat

- All Implemented Interfaces:
    NamedSPILoader.NamedSPI

      public class DirectDocValuesFormat
      extends DocValuesFormat

  In-memory docvalues format that does no (or very little) compression. Indexed values are stored on disk, but then at search time all values are loaded into memory as simple java arrays. For numeric values, it uses byte[], short[], int[], long[] as necessary to fit the range of the values. For binary values, there is an int (4 bytes) overhead per value.

  Limitations:

  - For binary and sorted fields the total space required for all binary values cannot exceed about 2.1 GB (see #MAX_TOTAL_BYTES_LENGTH).
  - For sorted set fields, the sum of the size of each document's set of values cannot exceed about 2.1 B values (see #MAX_SORTED_SET_ORDS). For example, if every document has 10 values (10 instances of `SortedSetDocValuesField`) added, then no more than ~210 M documents can be added to one segment.

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static int` | `MAX_SORTED_SET_ORDS` The sum of the number of values across all documents in a sorted set field cannot exceed this.
    `static int` | `MAX_TOTAL_BYTES_LENGTH` The sum of all byte lengths for binary field, or for the unique values in sorted or sorted set fields, cannot exceed this.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `DirectDocValuesFormat()` Sole constructor.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `DocValuesConsumer` | `fieldsConsumer(SegmentWriteState state)`
    `DocValuesProducer` | `fieldsProducer(SegmentReadState state)`

    - ### Methods inherited from class org.apache.lucene.codecs.DocValuesFormat

      `availableDocValuesFormats, forName, getName, reloadDocValuesFormats, toString`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- - ### Field Detail

    - #### MAX_TOTAL_BYTES_LENGTH

          public static final int MAX_TOTAL_BYTES_LENGTH

      The sum of all byte lengths for binary field, or for the unique values in sorted or sorted set fields, cannot exceed this.

    - #### MAX_SORTED_SET_ORDS

          public static final int MAX_SORTED_SET_ORDS

      The sum of the number of values across all documents in a sorted set field cannot exceed this.

  - ### Constructor Detail

    - #### DirectDocValuesFormat

          public DirectDocValuesFormat()

      Sole constructor.

  - ### Method Detail

    - #### fieldsConsumer

          public DocValuesConsumer fieldsConsumer(SegmentWriteState state)
                                           throws IOException

      Specified by:
        `fieldsConsumer` in class `DocValuesFormat`
      Throws:
        `IOException`

    - #### fieldsProducer

          public DocValuesProducer fieldsProducer(SegmentReadState state)
                                           throws IOException

      Specified by:
        `fieldsProducer` in class `DocValuesFormat`
      Throws:
        `IOException`

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