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[WIP] Update documentation for enlarging file meta cache
docs: update SST metadata cache default
Jul 14, 2026
waynexia
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Jul 14, 2026
waynexia
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July 14, 2026 08:09
fengjiachun
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Jul 15, 2026
| | `global_write_buffer_size` | String | `1GB` | Global write buffer size for all regions. If not set, it's default to 1/8 of OS memory with a max limitation of 1GB. | | ||
| | `global_write_buffer_reject_size` | String | `2GB` | Global write buffer size threshold to reject write requests. If not set, it's default to 2 times of `global_write_buffer_size` | | ||
| | `sst_meta_cache_size` | String | `128MB` | Cache size for SST metadata. Setting it to 0 to disable the cache.<br/>If not set, it's default to 1/32 of OS memory with a max limitation of 128MB. | | ||
| | `sst_meta_cache_size` | String | `512MB` | Cache size for SST metadata. Setting it to 0 to disable the cache.<br/>If not set, it's default to 1/8 of OS memory with a max limitation of 512MB. | |
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Could we use Auto here (and 自动 in the Chinese mirror) instead of 512MB? The runtime default is min(OS memory / 8, 512MB), so hosts with less than 4 GiB of memory get a smaller value. The generated GreptimeDB config reference also marks this field as Auto; listing the cap as the default makes the auto-sized value look fixed.
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What's Changed in this PR
min(1/8 of OS memory, 512MB).Checklist
sidebars.tsmatches the current document structure when you changed the document structure.