tikv: enable async-io by setting raftstore.store-io-pool-size == 1 as…

… default. (pingcap#16735)
lilin90 · Mar 20, 2024 · 3d5a1cb · 3d5a1cb
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diff --git a/tikv-configuration-file.md b/tikv-configuration-file.md
@@ -990,7 +990,7 @@ Configuration items related to Raftstore.
 ### `store-io-pool-size` <span class="version-mark">New in v5.3.0</span>
 
 + The allowable number of threads that process Raft I/O tasks, which is the size of the StoreWriter thread pool. When you modify the size of this thread pool, refer to [Performance tuning for TiKV thread pools](/tune-tikv-thread-performance.md#performance-tuning-for-tikv-thread-pools).
-+ Default value: `0`
++ Default value: `1` (Before v8.0.0, the default value is `0`)
 + Minimum value: `0`
 
 ### `future-poll-size`

diff --git a/tune-tikv-thread-performance.md b/tune-tikv-thread-performance.md
@@ -61,7 +61,7 @@ Starting from TiKV v5.0, all read requests use the unified thread pool for queri
 
 * The Raftstore thread pool.
 
-    The Raftstore thread pool is the most complex thread pool in TiKV. The default size (configured by `raftstore.store-pool-size`) of this thread pool is `2`. For the StoreWriter thread pool, the default size (configured by `raftstore.store-io-pool-size`) is `0`.
+    The Raftstore thread pool is the most complex thread pool in TiKV. The default size (configured by `raftstore.store-pool-size`) of this thread pool is `2`. For the StoreWriter thread pool, the default size (configured by `raftstore.store-io-pool-size`) is `1`.
 
     - When the size of the StoreWriter thread pool is 0, all write requests are written into RocksDB in the way of `fsync` by the Raftstore thread. In this case, it is recommended to tune the performance as follows: