| /* |
| * 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.geode.internal.cache; |
| |
| import org.apache.logging.log4j.Logger; |
| |
| import org.apache.geode.logging.internal.log4j.api.LogService; |
| |
| /** |
| * Keeps track redundancy statistics across the buckets of a given {@link PartitionedRegion} |
| */ |
| class PartitionedRegionRedundancyTracker { |
| private static final Logger logger = LogService.getLogger(); |
| |
| private final PartitionedRegionStats stats; |
| private final String regionPath; |
| private final int totalBuckets; |
| private final int targetRedundancy; |
| |
| private int lowRedundancyBuckets; |
| private int noCopiesBuckets; |
| private int lowestBucketCopies; |
| private volatile int actualRedundancy; |
| |
| /** |
| * Creates a new PartitionedRegionRedundancyTracker |
| * |
| * @param totalBuckets number of buckets in the region to track |
| * @param redundantCopies number of redundant copies specified on the region to track |
| * @param stats the statistics container for the region to track |
| * @param regionPath the full path of the region to track |
| */ |
| PartitionedRegionRedundancyTracker(int totalBuckets, int redundantCopies, |
| PartitionedRegionStats stats, String regionPath) { |
| this.stats = stats; |
| this.regionPath = regionPath; |
| this.totalBuckets = totalBuckets; |
| targetRedundancy = redundantCopies; |
| lowestBucketCopies = redundantCopies + 1; |
| } |
| |
| /** |
| * Since consistency was last reached, provides the lowest number of copies of a bucket that have |
| * been remaining across all the buckets in the region |
| * |
| * @return the number of copies of the bucket with the least copies available |
| */ |
| int getLowestBucketCopies() { |
| return lowestBucketCopies; |
| } |
| |
| int getLowRedundancyBuckets() { |
| return lowRedundancyBuckets; |
| } |
| |
| /** |
| * Increments the count of buckets that do not meet redundancy |
| */ |
| synchronized void incrementLowRedundancyBucketCount() { |
| if (lowRedundancyBuckets == totalBuckets) { |
| return; |
| } |
| lowRedundancyBuckets++; |
| stats.incLowRedundancyBucketCount(1); |
| } |
| |
| /** |
| * Updates the count of copies for the bucket with the least copies if a new low has been reached |
| * |
| * @param bucketCopies number of copies of a bucket remaining |
| */ |
| synchronized void reportBucketCount(int bucketCopies) { |
| if (bucketCopies < lowestBucketCopies) { |
| lowestBucketCopies = bucketCopies; |
| logger.warn("Redundancy has dropped below {} configured copies to {} actual copies for {}", |
| new Object[] {targetRedundancy + 1, bucketCopies, regionPath}); |
| } |
| } |
| |
| /** |
| * Increments the count of buckets that no longer have any copies remaining |
| */ |
| synchronized void incrementNoCopiesBucketCount() { |
| if (noCopiesBuckets == totalBuckets) { |
| return; |
| } |
| noCopiesBuckets++; |
| stats.incNoCopiesBucketCount(1); |
| if (noCopiesBuckets == 1) { |
| logger.warn("All in memory copies of some data have been lost for " + regionPath); |
| } |
| } |
| |
| /** |
| * Decrements the count of buckets that do not meet redundancy |
| */ |
| synchronized void decrementLowRedundancyBucketCount() { |
| if (lowRedundancyBuckets == 0) { |
| return; |
| } |
| lowRedundancyBuckets--; |
| stats.incLowRedundancyBucketCount(-1); |
| if (lowRedundancyBuckets == 0) { |
| lowestBucketCopies = targetRedundancy + 1; |
| logger.info("Configured redundancy of " + (targetRedundancy + 1) |
| + " copies has been restored to " + regionPath); |
| } |
| } |
| |
| /** |
| * Decrements the count of buckets that no longer have any copies remaining |
| */ |
| synchronized void decrementNoCopiesBucketCount() { |
| if (noCopiesBuckets == 0) { |
| return; |
| } |
| noCopiesBuckets--; |
| stats.incNoCopiesBucketCount(-1); |
| // if the last bucket with no copies has gained a copy, the bucket with the lowest |
| // number of copies (that bucket) has one copy |
| if (noCopiesBuckets == 0) { |
| lowestBucketCopies = 1; |
| } |
| } |
| |
| public int getActualRedundancy() { |
| return actualRedundancy; |
| } |
| |
| void setActualRedundancy(int actualRedundancy) { |
| int nonNegativeRedundancy = Math.max(actualRedundancy, 0); |
| this.actualRedundancy = nonNegativeRedundancy; |
| stats.setActualRedundantCopies(nonNegativeRedundancy); |
| } |
| } |