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 |
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. |
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.
- See Also:
- Constant Field Values
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.
- See Also:
- Constant Field Values
DirectDocValuesFormat
public DirectDocValuesFormat()
- Sole constructor.
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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