| /* |
| * 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 java.io.Serializable; |
| import org.apache.ignite.internal.mem.IgniteOutOfMemoryException; |
| |
| import static org.apache.ignite.configuration.MemoryConfiguration.DFLT_MEM_PLC_DEFAULT_NAME; |
| |
| /** |
| * This class allows defining custom memory policies' configurations with various parameters for Apache Ignite |
| * page memory (see {@link MemoryConfiguration}. For each configured memory policy Apache Ignite instantiates |
| * respective memory regions with different parameters like maximum size, eviction policy, swapping options, etc. |
| * An Apache Ignite cache can be mapped to a particular policy using |
| * {@link CacheConfiguration#setMemoryPolicyName(String)} method. |
| * <p>Sample configuration below shows how to configure several memory policies:</p> |
| * <pre> |
| * {@code |
| * <property name="memoryConfiguration"> |
| * <bean class="org.apache.ignite.configuration.MemoryConfiguration"> |
| * <property name="defaultMemoryPolicyName" value="Default_Region"/> |
| * <property name="pageSize" value="4096"/> |
| * |
| * <property name="memoryPolicies"> |
| * <list> |
| * <bean class="org.apache.ignite.configuration.MemoryPolicyConfiguration"> |
| * <property name="name" value="Default_Region"/> |
| * <property name="initialSize" value="#{100 * 1024 * 1024}"/> |
| * </bean> |
| * |
| * <bean class="org.apache.ignite.configuration.MemoryPolicyConfiguration"> |
| * <property name="name" value="20MB_Region_Eviction"/> |
| * <property name="initialSize" value="#{20 * 1024 * 1024}"/> |
| * <property name="pageEvictionMode" value="RANDOM_2_LRU"/> |
| * </bean> |
| * |
| * <bean class="org.apache.ignite.configuration.MemoryPolicyConfiguration"> |
| * <property name="name" value="25MB_Region_Swapping"/> |
| * <property name="initialSize" value="#{25 * 1024 * 1024}"/> |
| * <property name="initialSize" value="#{100 * 1024 * 1024}"/> |
| * <property name="swapFilePath" value="memoryPolicyExampleSwap"/> |
| * </bean> |
| * </list> |
| * </property> |
| * } |
| * </pre> |
| */ |
| public final class MemoryPolicyConfiguration implements Serializable { |
| /** */ |
| private static final long serialVersionUID = 0L; |
| |
| /** Default metrics enabled flag. */ |
| public static final boolean DFLT_METRICS_ENABLED = false; |
| |
| /** Memory policy name. */ |
| private String name = DFLT_MEM_PLC_DEFAULT_NAME; |
| |
| /** Memory policy start size. */ |
| private long initialSize = MemoryConfiguration.DFLT_MEMORY_POLICY_INITIAL_SIZE; |
| |
| /** Memory policy maximum size. */ |
| private long maxSize = MemoryConfiguration.DFLT_MEMORY_POLICY_MAX_SIZE; |
| |
| /** An optional path to a memory mapped file for this memory policy. */ |
| private String swapFilePath; |
| |
| /** An algorithm for memory pages eviction. */ |
| private DataPageEvictionMode pageEvictionMode = DataPageEvictionMode.DISABLED; |
| |
| /** |
| * A threshold for memory pages eviction initiation. For instance, if the threshold is 0.9 it means that the page |
| * memory will start the eviction only after 90% memory region (defined by this policy) is occupied. |
| */ |
| private double evictionThreshold = 0.9; |
| |
| /** Minimum number of empty pages in reuse lists. */ |
| private int emptyPagesPoolSize = 100; |
| |
| /** */ |
| private boolean metricsEnabled = DFLT_METRICS_ENABLED; |
| |
| /** |
| * Gets memory policy name. |
| * |
| * @return Memory policy name. |
| */ |
| public String getName() { |
| return name; |
| } |
| |
| /** |
| * Sets memory policy name. The name must be non empty and must not be equal to the reserved 'sysMemPlc' one. |
| * |
| * If not specified, {@link MemoryConfiguration#DFLT_MEM_PLC_DEFAULT_NAME} value is used. |
| * |
| * @param name Memory policy name. |
| * @return {@code this} for chaining. |
| */ |
| public MemoryPolicyConfiguration setName(String name) { |
| this.name = name; |
| |
| return this; |
| } |
| |
| /** |
| * Maximum memory region size defined by this memory policy. If the whole data can not fit into the memory region |
| * an out of memory exception will be thrown. |
| * |
| * @return Size in bytes. |
| */ |
| public long getMaxSize() { |
| return maxSize; |
| } |
| |
| /** |
| * Sets maximum memory region size defined by this memory policy. The total size should not be less than 10 MB |
| * due to the internal data structures overhead. |
| * |
| * @param maxSize Maximum memory policy size in bytes. |
| * @return {@code this} for chaining. |
| */ |
| public MemoryPolicyConfiguration setMaxSize(long maxSize) { |
| this.maxSize = maxSize; |
| |
| return this; |
| } |
| |
| /** |
| * Gets initial memory region size defined by this memory policy. When the used memory size exceeds this value, |
| * new chunks of memory will be allocated. |
| * |
| * @return Memory policy start size. |
| */ |
| public long getInitialSize() { |
| return initialSize; |
| } |
| |
| /** |
| * Sets initial memory region size defined by this memory policy. When the used memory size exceeds this value, |
| * new chunks of memory will be allocated. |
| * |
| * @param initialSize Memory policy initial size. |
| * @return {@code this} for chaining. |
| */ |
| public MemoryPolicyConfiguration setInitialSize(long initialSize) { |
| this.initialSize = initialSize; |
| |
| return this; |
| } |
| |
| /** |
| * A path to the memory-mapped file the memory region defined by this memory policy will be mapped to. Having |
| * the path set, allows relying on swapping capabilities of an underlying operating system for the memory region. |
| * |
| * @return A path to the memory-mapped file or {@code null} if this feature is not used for the memory region defined |
| * by this memory policy. |
| */ |
| public String getSwapFilePath() { |
| return swapFilePath; |
| } |
| |
| /** |
| * Sets a path to the memory-mapped file. |
| * |
| * @param swapFilePath A Path to the memory mapped file. |
| * @return {@code this} for chaining. |
| */ |
| public MemoryPolicyConfiguration setSwapFilePath(String swapFilePath) { |
| this.swapFilePath = swapFilePath; |
| |
| return this; |
| } |
| |
| /** |
| * Gets memory pages eviction mode. If {@link DataPageEvictionMode#DISABLED} is used (default) then an out of |
| * memory exception will be thrown if the memory region usage, defined by this memory policy, goes beyond its |
| * capacity which is {@link #getMaxSize()}. |
| * |
| * @return Memory pages eviction algorithm. {@link DataPageEvictionMode#DISABLED} used by default. |
| */ |
| public DataPageEvictionMode getPageEvictionMode() { |
| return pageEvictionMode; |
| } |
| |
| /** |
| * Sets memory pages eviction mode. |
| * |
| * @param evictionMode Eviction mode. |
| * @return {@code this} for chaining. |
| */ |
| public MemoryPolicyConfiguration setPageEvictionMode(DataPageEvictionMode evictionMode) { |
| pageEvictionMode = evictionMode; |
| |
| return this; |
| } |
| |
| /** |
| * Gets a threshold for memory pages eviction initiation. For instance, if the threshold is 0.9 it means that the |
| * page memory will start the eviction only after 90% of the memory region (defined by this policy) is occupied. |
| * |
| * @return Memory pages eviction threshold. |
| */ |
| public double getEvictionThreshold() { |
| return evictionThreshold; |
| } |
| |
| /** |
| * Sets memory pages eviction threshold. |
| * |
| * @param evictionThreshold Eviction threshold. |
| * @return {@code this} for chaining. |
| */ |
| public MemoryPolicyConfiguration setEvictionThreshold(double evictionThreshold) { |
| this.evictionThreshold = evictionThreshold; |
| |
| return this; |
| } |
| |
| /** |
| * Specifies the minimal number of empty pages to be present in reuse lists for this memory policy. |
| * This parameter ensures that Ignite will be able to successfully evict old data entries when the size of |
| * (key, value) pair is slightly larger than page size / 2. |
| * Increase this parameter if cache can contain very big entries (total size of pages in this pool should be enough |
| * to contain largest cache entry). |
| * Increase this parameter if {@link IgniteOutOfMemoryException} occurred with enabled page eviction. |
| * |
| * @return Minimum number of empty pages in reuse list. |
| */ |
| public int getEmptyPagesPoolSize() { |
| return emptyPagesPoolSize; |
| } |
| |
| /** |
| * Specifies the minimal number of empty pages to be present in reuse lists for this memory policy. |
| * This parameter ensures that Ignite will be able to successfully evict old data entries when the size of |
| * (key, value) pair is slightly larger than page size / 2. |
| * Increase this parameter if cache can contain very big entries (total size of pages in this pool should be enough |
| * to contain largest cache entry). |
| * Increase this parameter if {@link IgniteOutOfMemoryException} occurred with enabled page eviction. |
| * |
| * @param emptyPagesPoolSize Empty pages pool size. |
| * @return {@code this} for chaining. |
| */ |
| public MemoryPolicyConfiguration setEmptyPagesPoolSize(int emptyPagesPoolSize) { |
| this.emptyPagesPoolSize = emptyPagesPoolSize; |
| |
| return this; |
| } |
| |
| /** |
| * Gets whether memory metrics are enabled by default on node startup. Memory metrics can be enabled and disabled |
| * at runtime via memory metrics MX bean. |
| * |
| * @return Metrics enabled flag. |
| */ |
| public boolean isMetricsEnabled() { |
| return metricsEnabled; |
| } |
| |
| /** |
| * Sets memory metrics enabled flag. If this flag is {@code true}, metrics will be enabled on node startup. |
| * Memory metrics can be enabled and disabled at runtime via memory metrics MX bean. |
| * |
| * @param metricsEnabled Metrics enanabled flag. |
| * @return {@code this} for chaining. |
| */ |
| public MemoryPolicyConfiguration setMetricsEnabled(boolean metricsEnabled) { |
| this.metricsEnabled = metricsEnabled; |
| |
| return this; |
| } |
| } |