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40 lines
1.3 KiB
Markdown
40 lines
1.3 KiB
Markdown
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## Object caching
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Object caching by turned on by default with following settings
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- Default cache size 8GB, can be changed from environment variable
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``MINIO_CACHE_SIZE`` supports both SI and ISO IEC standard forms
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for input size parameters.
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- Default expiration of entries is 72 hours, can be changed from
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environment variable ``MINIO_CACHE_EXPIRY`` supportings Go
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``time.Duration`` with valid units "ns", "us" (or "µs"),
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"ms", "s", "m", "h".
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- Default expiry interval is 1/4th of the expiration hours, so
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expiration sweep happens across the cache every 1/4th the time
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duration of the set entry expiration duration.
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### Tricks
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Setting MINIO_CACHE_SIZE=0 will turn off caching entirely.
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Setting MINIO_CACHE_EXPIRY=0s will turn off cache garbage collections,
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all cached objects will never expire.
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### Behavior
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Caching happens for both GET and PUT.
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- GET caches new objects for entries not found in cache,
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otherwise serves from the cache.
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- PUT/POST caches all successfully uploaded objects.
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NOTE: Cache is not populated if there are any errors
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while reading from the disk.
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Expiration happens automatically based on the configured
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interval as explained above, frequently accessed objects
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stay alive for significantly longer time due to the fact
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that expiration time is reset for every cache hit.
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