| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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.apache.cassandra.io.sstable.filter; |
| |
| import java.util.Arrays; |
| import java.util.List; |
| |
| import org.apache.cassandra.io.sstable.AbstractMetricsProviders; |
| import org.apache.cassandra.io.sstable.GaugeProvider; |
| import org.apache.cassandra.io.sstable.format.SSTableReader; |
| import org.apache.cassandra.io.sstable.format.SSTableReaderWithFilter; |
| |
| public class BloomFilterMetrics<R extends SSTableReaderWithFilter> extends AbstractMetricsProviders<R> |
| { |
| public final static BloomFilterMetrics<?> instance = new BloomFilterMetrics<>(); |
| |
| @Override |
| protected R map(SSTableReader r) |
| { |
| if (r instanceof SSTableReaderWithFilter) |
| return (R) r; |
| return null; |
| } |
| |
| /** |
| * Number of false positives in bloom filter |
| */ |
| public final GaugeProvider<Long> bloomFilterFalsePositives = newGaugeProvider("BloomFilterFalsePositives", |
| 0L, |
| r -> r.getFilterTracker().getFalsePositiveCount(), |
| Long::sum); |
| |
| /** |
| * Number of false positives in bloom filter from last read |
| */ |
| public final GaugeProvider<Long> recentBloomFilterFalsePositives = newGaugeProvider("RecentBloomFilterFalsePositives", |
| 0L, |
| r -> r.getFilterTracker().getRecentFalsePositiveCount(), |
| Long::sum); |
| |
| /** |
| * Disk space used by bloom filter |
| */ |
| public final GaugeProvider<Long> bloomFilterDiskSpaceUsed = newGaugeProvider("BloomFilterDiskSpaceUsed", |
| 0L, |
| SSTableReaderWithFilter::getFilterSerializedSize, |
| Long::sum); |
| |
| /** |
| * Off heap memory used by bloom filter |
| */ |
| public final GaugeProvider<Long> bloomFilterOffHeapMemoryUsed = newGaugeProvider("BloomFilterOffHeapMemoryUsed", |
| 0L, |
| SSTableReaderWithFilter::getFilterOffHeapSize, |
| Long::sum); |
| |
| /** |
| * False positive ratio of bloom filter |
| */ |
| public final GaugeProvider<Double> bloomFilterFalseRatio = newGaugeProvider("BloomFilterFalseRatio", readers -> { |
| long falsePositiveCount = 0L; |
| long truePositiveCount = 0L; |
| long trueNegativeCount = 0L; |
| for (SSTableReaderWithFilter sstable : readers) |
| { |
| falsePositiveCount += sstable.getFilterTracker().getFalsePositiveCount(); |
| truePositiveCount += sstable.getFilterTracker().getTruePositiveCount(); |
| trueNegativeCount += sstable.getFilterTracker().getTrueNegativeCount(); |
| } |
| if (falsePositiveCount == 0L && truePositiveCount == 0L) |
| return 0d; |
| return (double) falsePositiveCount / (truePositiveCount + falsePositiveCount + trueNegativeCount); |
| }); |
| |
| /** |
| * False positive ratio of bloom filter from last read |
| */ |
| public final GaugeProvider<Double> recentBloomFilterFalseRatio = newGaugeProvider("RecentBloomFilterFalseRatio", readers -> { |
| long falsePositiveCount = 0L; |
| long truePositiveCount = 0L; |
| long trueNegativeCount = 0L; |
| for (SSTableReaderWithFilter sstable : readers) |
| { |
| falsePositiveCount += sstable.getFilterTracker().getRecentFalsePositiveCount(); |
| truePositiveCount += sstable.getFilterTracker().getRecentTruePositiveCount(); |
| trueNegativeCount += sstable.getFilterTracker().getRecentTrueNegativeCount(); |
| } |
| if (falsePositiveCount == 0L && truePositiveCount == 0L) |
| return 0d; |
| return (double) falsePositiveCount / (truePositiveCount + falsePositiveCount + trueNegativeCount); |
| }); |
| |
| private final List<GaugeProvider<?>> gaugeProviders = Arrays.asList(bloomFilterFalsePositives, |
| recentBloomFilterFalsePositives, |
| bloomFilterDiskSpaceUsed, |
| bloomFilterOffHeapMemoryUsed, |
| bloomFilterFalseRatio, |
| recentBloomFilterFalseRatio); |
| |
| public List<GaugeProvider<?>> getGaugeProviders() |
| { |
| return gaugeProviders; |
| } |
| } |