07.Write-Stall.md

RocksDB在Flush或Compaction时，速度跟不上新写入速率，存储引擎启动保护机制:延迟写或者禁写

Too many memtables

• 写限速
  • 将要Flush的memtables大于等于max_write_buffer_number-1, write会被限速
• 禁写
  • memtable个数大于等于max_write_buffer_number且写满, 触发禁写，等到Flush完成后允许继续写入

Too many Level-0 SST files

• 写限速
  • L0文件数量达到level0_slowdown_writes_trigger, 触发写限速
• 禁写
  • L0文件数量达到Level0_stop_writes_trigger，触发禁写

Too many pending compaction bytes

• 写限速
  • 等待Compaction的SST个数大于该值则触发写限速

  level0_slowdown_writes_trigger = {}
  

• 禁写
  • 等待Compaction的SST个数大于该值则触发禁写

  level0_stop_writes_trigger = {}