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To allow better control the cache eviction process. Introduce MINIO_CACHE_WATERMARK_LOW and MINIO_CACHE_WATERMARK_HIGH env. variables to specify when to stop/start cache eviction process. Deprecate MINIO_CACHE_EXPIRY environment variable. Cache gc sweeps at 30 minute intervals whenever high watermark is reached to clear least recently accessed entries in the cache until sufficient space is cleared to reach the low watermark. Garbage collection uses an adaptive file scoring approach based on last access time, with greater weights assigned to larger objects and those with more hits to find the candidates for eviction. Thanks to @klauspost for this file scoring algorithm Co-authored-by: Klaus Post <klauspost@minio.io>
73 lines
2.0 KiB
Go
73 lines
2.0 KiB
Go
/*
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* MinIO Cloud Storage, (C) 2019 MinIO, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cache
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import "github.com/minio/minio/cmd/config"
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// Help template for caching feature.
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var (
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Help = config.HelpKVS{
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config.HelpKV{
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Key: Drives,
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Description: `comma separated mountpoints e.g. "/optane1,/optane2"`,
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Type: "csv",
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},
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config.HelpKV{
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Key: Expiry,
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Description: `cache expiry duration in days e.g. "90"`,
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Optional: true,
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Type: "number",
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},
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config.HelpKV{
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Key: Quota,
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Description: `limit cache drive usage in percentage e.g. "90"`,
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Optional: true,
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Type: "number",
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},
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config.HelpKV{
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Key: Exclude,
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Description: `comma separated wildcard exclusion patterns e.g. "bucket/*.tmp,*.exe"`,
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Optional: true,
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Type: "csv",
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},
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config.HelpKV{
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Key: config.Comment,
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Description: config.DefaultComment,
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Optional: true,
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Type: "sentence",
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},
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config.HelpKV{
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Key: After,
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Description: `minimum accesses before caching an object`,
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Optional: true,
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Type: "number",
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},
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config.HelpKV{
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Key: WatermarkLow,
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Description: `% of cache use at which to stop cache eviction`,
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Optional: true,
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Type: "number",
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},
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config.HelpKV{
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Key: WatermarkHigh,
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Description: `% of cache use at which to start cache eviction`,
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Optional: true,
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Type: "number",
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},
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}
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)
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