1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.index.fielddata;
import org.apache.lucene.index.FilteredTermsEnum;
import org.apache.lucene.index.TermsEnum;
import org.apache.lucene.util.BytesRef;
import org.elasticsearch.common.breaker.CircuitBreaker;
import org.elasticsearch.index.fielddata.plain.AbstractIndexFieldData;
import java.io.IOException;
/**
* {@link TermsEnum} that takes a MemoryCircuitBreaker, increasing the breaker
* every time {@code .next(...)} is called. Proxies all methods to the original
* TermsEnum otherwise.
*/
public final class RamAccountingTermsEnum extends FilteredTermsEnum {
// Flush every 5mb
private static final long FLUSH_BUFFER_SIZE = 1024 * 1024 * 5;
private final CircuitBreaker breaker;
private final TermsEnum termsEnum;
private final AbstractIndexFieldData.PerValueEstimator estimator;
private final String fieldName;
private long totalBytes;
private long flushBuffer;
public RamAccountingTermsEnum(TermsEnum termsEnum, CircuitBreaker breaker, AbstractIndexFieldData.PerValueEstimator estimator,
String fieldName) {
super(termsEnum);
this.breaker = breaker;
this.termsEnum = termsEnum;
this.estimator = estimator;
this.fieldName = fieldName;
this.totalBytes = 0;
this.flushBuffer = 0;
}
/**
* Always accept the term.
*/
@Override
protected AcceptStatus accept(BytesRef term) throws IOException {
return AcceptStatus.YES;
}
/**
* Flush the {@code flushBuffer} to the breaker, incrementing the total
* bytes and resetting the buffer.
*/
public void flush() {
breaker.addEstimateBytesAndMaybeBreak(this.flushBuffer, this.fieldName);
this.totalBytes += this.flushBuffer;
this.flushBuffer = 0;
}
/**
* Proxy to the original next() call, but estimates the overhead of
* loading the next term.
*/
@Override
public BytesRef next() throws IOException {
BytesRef term = termsEnum.next();
if (term == null && this.flushBuffer != 0) {
// We have reached the end of the termsEnum, flush the buffer
flush();
} else {
this.flushBuffer += estimator.bytesPerValue(term);
if (this.flushBuffer >= FLUSH_BUFFER_SIZE) {
flush();
}
}
return term;
}
/**
* @return the total number of bytes that have been aggregated
*/
public long getTotalBytes() {
return this.totalBytes;
}
}
|