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tiflash: add descriptions for some conf items under [flash] section #15039

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Oct 7, 2023
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tiflash: add descriptions for some conf items under [flash] section #15039

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CalvinNeo Sep 14, 2023
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Update tiflash/tiflash-configuration.md
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9 changes: 9 additions & 0 deletions tiflash/tiflash-configuration.md
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Expand Up @@ -131,6 +131,15 @@ delta_index_cache_size = 0
tidb_status_addr = tidb status 端口地址 # 多个地址以逗号分割
service_addr = TiFlash raft 服务 和 coprocessor 服务监听地址

## 从 v7.4.0 引入，在当前 Raft 状态机推进的 applied_index 和上次落盘时的 applied_index 的差值高于 compact_log_min_gap 时，
## TiFlash 将执行来自 TiKV 的 CompactLog 命令，并进行数据落盘。调大该差值可能降低 TiFlash 的落盘频率，从而减少随机写场景下的读延迟，但会增大内存开销。调小该差值可能提升 TiFlash 的落盘频率，从而缓解 TiFlash 内存压力。但无论如何，在目前阶段，TiFlash 的落盘频率不会高于 TiKV，即使设置该差值为 0。
## 建议保持默认值。
# compact_log_min_gap = 200
## 从 v5.0 引入，当 TiFlash 缓存的 Region 行数或者大小超过以下任一阈值时，TiFlash 将执行来自 TiKV 的 CompactLog 命令，并进行落盘。
## 建议保持默认值。
# compact_log_min_rows = 40960 # 40k
# compact_log_min_bytes = 33554432 # 32MB

## 下面的配置只针对存算分离模式生效，详情请参考 TiFlash 存算分离架构与 S3 支持文档 https://docs.pingcap.com/zh/tidb/dev/tiflash-disaggregated-and-s3
# disaggregated_mode = tiflash_write # 可选值为 tiflash_write 或者 tiflash_compute

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