tikv: configuration change 6.0

tikv-configuration-file.md

@@ -823,13 +823,19 @@ Configuration items related to RocksDB
 ### `max-background-jobs`
 
 + The number of background threads in RocksDB. When you modify the size of the RocksDB thread pool, refer to [Performance tuning for TiKV thread pools](/tune-tikv-thread-performance.md#performance-tuning-for-tikv-thread-pools).
-+ Default value: `9`
++ Default value:
+    + When the number of CPU cores is 10, the default value is `9`.
+    + When the number of CPU cores is 8, the default value is `7`.
+    + When the number of CPU cores is `N`, the default value is `max(2, min(N - 1, 9))`.
 + Minimum value: `2`
 
 ### `max-background-flushes`
 
 + The maximum number of concurrent background memtable flush jobs
-+ Default value: `3`
++ Default value:
+    + When the number of CPU cores is 10, the default value is `3`.
+    + When the number of CPU cores is 8, the default value is `2`.
+    + When the number of CPU cores is `N`, the default value is `[(max-background-jobs + 3) / 4]`.
 + Minimum value: `1`
 
 ### `max-sub-compactions`
@@ -934,8 +940,8 @@ Configuration items related to RocksDB
 
 ### `enable-pipelined-write`
 
-+ This configuration is no longer used to enable or disable Pipelined Write. When this configuration is enabled, the previous Pipelined Write is used. When this configuration is disabled, the new Pipelined Commit mechanism is used.
-+ Default value: `true`
++ Controls whether to enable Pipelined Write. When this configuration is enabled, the previous Pipelined Write is used. When this configuration is disabled, the new Pipelined Commit mechanism is used.
++ Default value: `false`
 
 ### `bytes-per-sync`