[be](parameter) change default fragment_pool_thread_num_max from 512 to 2048 (#22448)

change some parameter's default value:
brpc_num_threads from -1 to 256
compaction_task_num_per_disk from 2 to 4
compaction_task_num_per_fast_disk from 4 to 8
fragment_pool_thread_num_max from 512 to 2048
fragment_pool_queue_size from 2048 to 4096

---------

Co-authored-by: yiguolei <yiguolei@gmail.com>

be/src/common/config.cpp

@@ -62,7 +62,7 @@ DEFINE_Int32(brpc_port, "8060");
 
 // the number of bthreads for brpc, the default value is set to -1,
 // which means the number of bthreads is #cpu-cores
-DEFINE_Int32(brpc_num_threads, "-1");
+DEFINE_Int32(brpc_num_threads, "256");
 
 // Declare a selection strategy for those servers have many ips.
 // Note that there should at most one ip match this list.
@@ -394,9 +394,9 @@ DEFINE_mInt32(update_replica_infos_interval_seconds, "60");
 
 // Compaction task number per disk.
 // Must be greater than 2, because Base compaction and Cumulative compaction have at least one thread each.
-DEFINE_mInt32(compaction_task_num_per_disk, "2");
+DEFINE_mInt32(compaction_task_num_per_disk, "4");
 // compaction thread num for fast disk(typically .SSD), must be greater than 2.
-DEFINE_mInt32(compaction_task_num_per_fast_disk, "4");
+DEFINE_mInt32(compaction_task_num_per_fast_disk, "8");
 DEFINE_Validator(compaction_task_num_per_disk,
                  [](const int config) -> bool { return config >= 2; });
 DEFINE_Validator(compaction_task_num_per_fast_disk,
@@ -492,8 +492,8 @@ DEFINE_mInt32(olap_table_sink_send_interval_ms, "1");
 
 // Fragment thread pool
 DEFINE_Int32(fragment_pool_thread_num_min, "64");
-DEFINE_Int32(fragment_pool_thread_num_max, "512");
-DEFINE_Int32(fragment_pool_queue_size, "2048");
+DEFINE_Int32(fragment_pool_thread_num_max, "2048");
+DEFINE_Int32(fragment_pool_queue_size, "4096");
 
 // Control the number of disks on the machine.  If 0, this comes from the system settings.
 DEFINE_Int32(num_disks, "0");

docs/en/docs/admin-manual/config/be-config.md

@@ -326,7 +326,7 @@ There are two ways to configure BE configuration items:
 #### `fragment_pool_queue_size`
 
 * Description: The upper limit of query requests that can be processed on a single node
-* Default value: 2048
+* Default value: 4096
 
 #### `fragment_pool_thread_num_min`
 
@@ -336,7 +336,7 @@ There are two ways to configure BE configuration items:
 #### `fragment_pool_thread_num_max`
 
 * Description: Follow up query requests create threads dynamically, with a maximum of 512 threads created.
-* Default value: 512
+* Default value: 2048
 
 #### `doris_max_pushdown_conjuncts_return_rate`
 
@@ -596,13 +596,13 @@ BaseCompaction:546859:
 
 * Type: int32
 * Description: The number of compaction tasks which execute in parallel for a disk(HDD).
-* Default value: 2
+* Default value: 4
 
 #### `compaction_task_num_per_fast_disk`
 
 * Type: int32
 * Description: The number of compaction tasks which execute in parallel for a fast disk(SSD).
-* Default value: 4
+* Default value: 8
 
 #### `cumulative_compaction_rounds_for_each_base_compaction_round`
 

docs/zh-CN/docs/admin-manual/config/be-config.md

@@ -337,7 +337,7 @@ BE 重启后该配置将失效。如果想持久化修改结果，使用如下
 #### `fragment_pool_queue_size`
 
 * 描述：单节点上能够处理的查询请求上限
-* 默认值：2048
+* 默认值：4096
 
 #### `fragment_pool_thread_num_min`
 
@@ -347,7 +347,7 @@ BE 重启后该配置将失效。如果想持久化修改结果，使用如下
 #### `fragment_pool_thread_num_max`
 
 * 描述：后续查询请求动态创建线程，最大创建512个线程。
-* 默认值：512
+* 默认值：2048
 
 #### `doris_max_pushdown_conjuncts_return_rate`
 
@@ -610,13 +610,13 @@ BaseCompaction:546859:
 
 * 类型：int32
 * 描述：每个磁盘（HDD）可以并发执行的compaction任务数量。
-* 默认值：2
+* 默认值：4
 
 #### `compaction_task_num_per_fast_disk`
 
 * 类型：int32
 * 描述：每个高速磁盘（SSD）可以并发执行的compaction任务数量。
-* 默认值：4
+* 默认值：8
 
 #### `cumulative_compaction_rounds_for_each_base_compaction_round`