org.elasticsearch.index.fielddata.plain

Interface AbstractIndexFieldData.PerValueEstimator

All Known Implementing Classes:

NonEstimatingEstimator, PackedArrayIndexFieldData.PackedArrayEstimator, PagedBytesIndexFieldData.PagedBytesEstimator, ParentChildIndexFieldData.ParentChildEstimator

Enclosing class:

AbstractIndexFieldData<FD extends AtomicFieldData>

public static interface AbstractIndexFieldData.PerValueEstimator

A PerValueEstimator is a sub-class that can be used to estimate the memory overhead for loading the data. Each field data implementation should implement its own PerValueEstimator if it intends to take advantage of the MemoryCircuitBreaker.

Note that the .beforeLoad(...) and .afterLoad(...) methods must be manually called.

Method Summary

Modifier and Type	Method and Description
void	afterLoad(org.apache.lucene.index.TermsEnum termsEnum, long actualUsed) Possibly adjust a circuit breaker after field data has been loaded, now that the actual amount of memory used by the field data is known
org.apache.lucene.index.TermsEnum	beforeLoad(org.apache.lucene.index.Terms terms) Execute any pre-loading estimations for the terms.
long	bytesPerValue(org.apache.lucene.util.BytesRef term)

Method Detail

bytesPerValue

long bytesPerValue(org.apache.lucene.util.BytesRef term)

Returns:

the number of bytes for the given term

beforeLoad

org.apache.lucene.index.TermsEnum beforeLoad(org.apache.lucene.index.Terms terms)
                                      throws IOException

Execute any pre-loading estimations for the terms. May also optionally wrap a TermsEnum in a RamAccountingTermsEnum which will estimate the memory on a per-term basis.

Parameters:

terms - terms to be estimated

Returns:

A TermsEnum for the given terms

Throws:

IOException

afterLoad

void afterLoad(org.apache.lucene.index.TermsEnum termsEnum,
               long actualUsed)

Possibly adjust a circuit breaker after field data has been loaded, now that the actual amount of memory used by the field data is known

Parameters:

termsEnum - terms that were loaded

actualUsed - actual field data memory usage