| // 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. |
| = Volatile Storage |
| |
| == Overview |
| |
| Ignite Volatile storage is designed to provide a quick and responsive storage without guarantees of data persistence. |
| |
| |
| When it is enabled for the data region, Ignite stores all data in the data region in RAM. Data will be lost on cluster shutdown, so make sure to have a separate data region for persistent storage. |
| |
| == Configuration Parameters |
| |
| [cols="1,1,3",opts="header", stripes=none] |
| |=== |
| |Property|Default|Description |
| |
| |name|| The name of the data region. |
| |initSize|`256 * 1024 * 1024`| Sets the initial space allocated to the data region. |
| |maxSize|`256 * 1024 * 1024`| Sets the maximum space that can be allocated to the data region. |
| |evictionMode|`DISABLED`| Sets the eviction algorithm to use. Possible values: `DISABLED`, `RANDOM_LRU`, `RANDOM_2_LRU`. |
| |evictionThreshold|`0.9`| Configures when the eviction process starts. |
| |emptyPagesPoolSize|100| The maximum number of empty pages Ignite will try to keep. |
| |pageSize|16384| The size of pages in the storage, in bytes. |
| |memoryAllocator.type|unsafe|Memory allocator configuration. Uses `sun.misc.Unsafe` to improve performance. Currently, no other options are available. |
| |=== |
| |
| |
| == Configuration Example |
| |
| The example below shows how to configure one data region that uses volatile storage: |
| |
| ---- |
| ignite config set --type cluster \ |
| "{ |
| aimem.regions: [{ |
| name: btree_volatile_region, |
| maxSize: 256000000 |
| }] |
| }" |
| ---- |
