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53 lines
1.7 KiB
Markdown
53 lines
1.7 KiB
Markdown
**This is the documentation for etcd2 releases. Read [etcd3 doc][v3-docs] for etcd3 releases.**
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[v3-docs]: ../../docs.md#documentation
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## Physical machine
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GCE n1-standard-2 machine type
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- 1x dedicated local SSD mounted under /var/lib/etcd
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- 1x dedicated slow disk for the OS
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- 7.5 GB memory
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- 2x CPUs
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## etcd
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```
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etcd Version: 2.2.0-rc.0+git
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Git SHA: 103cb5c
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Go Version: go1.5
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Go OS/Arch: linux/amd64
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```
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## Testing
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Start 3-member etcd cluster, each of which uses 2 cores.
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The length of key name is always 64 bytes, which is a reasonable length of average key bytes.
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## Memory Maximal Usage
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- etcd may use maximal memory if one follower is dead and the leader keeps sending snapshots.
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- `max RSS` is the maximal memory usage recorded in 3 runs.
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| value bytes | key number | data size(MB) | max RSS(MB) | max RSS/data rate on leader |
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|-------------|-------------|---------------|-------------|-----------------------------|
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| 128 | 50000 | 6 | 433 | 72x |
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| 128 | 100000 | 12 | 659 | 54x |
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| 128 | 200000 | 24 | 1466 | 61x |
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| 1024 | 50000 | 48 | 1253 | 26x |
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| 1024 | 100000 | 96 | 2344 | 24x |
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| 1024 | 200000 | 192 | 4361 | 22x |
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## Data Size Threshold
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- When etcd reaches data size threshold, it may trigger leader election easily and drop part of proposals.
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- At most cases, etcd cluster should work smoothly if it doesn't hit the threshold. If it doesn't work well due to insufficient resources, you need to decrease its data size.
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| value bytes | key number limitation | suggested data size threshold(MB) | consumed RSS(MB) |
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|-------------|-----------------------|-----------------------------------|------------------|
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| 128 | 400K | 48 | 2400 |
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| 1024 | 300K | 292 | 6500 |
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