zstan commented on a change in pull request #8513: URL: https://github.com/apache/ignite/pull/8513#discussion_r554986017
########## File path: modules/core/src/main/java/org/apache/ignite/configuration/PageReplacementMode.java ########## @@ -0,0 +1,85 @@ +/* +* 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.ignite.configuration; + +import org.jetbrains.annotations.Nullable; + +/** + * Defines memory page replacement algorithm. A mode is set for a specific {@link DataRegionConfiguration}. + */ +public enum PageReplacementMode { + /** + * Random-LRU algorithm. + * + * Every time page is accessed, its timestamp gets updated. When a page fault occurs and it's required to replace + * some pages, the algorithm randomly chooses 5 pages from the page memory and evicts a page with the latest + * timestamp. + * + * This algorithm have zero maintenance cost, but not very effective in terms of finding next page to replace. + * Recommended to use in environments, where there are no page replacements (large enough data region to store all Review comment: How engineer or someone who would read this can detect is there are page replacements at all ? I suggest to add metric link here ? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected]
