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new 223a1017dc5a [docs] Clarify compaction thread count versus CPU
allocation (#4613)
223a1017dc5a is described below
commit 223a1017dc5a48f159c821254706bf12ab184ce6
Author: Mingyu Chen (Rayner) <[email protected]>
AuthorDate: Fri Nov 13 08:01:49 2026 +0800
[docs] Clarify compaction thread count versus CPU allocation (#4613)
The log-analysis guide described `max_cumu_compaction_threads = 8` as
assigning fixed CPU shares to ingestion, compaction, and queries. This
setting controls a thread pool, so that description promised resource
isolation it does not provide.
Clarify the 32-core example and distinguish the tuning recommendation
from a CPU quota in the English and Chinese dev, 4.x, and 3.x pages,
including retained active-version copies. Fixes #1737.
Validation: checked the cumulative thread-pool implementation on Doris
branch-3.0, branch-4.1, and master; front matter preservation and MDX
parsing passed for all 10 changed pages (after removing HTML comments);
`git diff --check` passed. This is a prose-only correction with stable
page paths, headings, and navigation.
Co-authored-by: morningman <[email protected]>
---
docs/observability/log.md | 2 +-
i18n/zh-CN/docusaurus-plugin-content-docs/current/observability/log.md | 2 +-
.../version-3.x/data-operate/import/import-way/log-storage-analysis.md | 2 +-
.../version-3.x/observability/log-storage-analysis.md | 2 +-
.../docusaurus-plugin-content-docs/version-3.x/observability/log.md | 2 +-
.../docusaurus-plugin-content-docs/version-4.x/observability/log.md | 2 +-
.../version-3.x/data-operate/import/import-way/log-storage-analysis.md | 2 +-
versioned_docs/version-3.x/observability/log.md | 2 +-
versioned_docs/version-3.x/practical-guide/log-storage-analysis.md | 2 +-
versioned_docs/version-4.x/observability/log.md | 2 +-
10 files changed, 10 insertions(+), 10 deletions(-)
diff --git a/docs/observability/log.md b/docs/observability/log.md
index 653948540a9a..f851115bd7bd 100644
--- a/docs/observability/log.md
+++ b/docs/observability/log.md
@@ -230,7 +230,7 @@ In `be/conf/be.conf`, adjust the BE configurations
according to the following ta
| Storage | `enable_file_cache = true`
| Enable file cache
|
| Storage | `file_cache_path = [{"path": "/mnt/datadisk0/file_cache",
"total_size":53687091200, "query_limit": "10737418240"},{"path":
"/mnt/datadisk1/file_cache", "total_size":53687091200,"query_limit":
"10737418240"}]` | Configure the cache
paths and settings for cold data:<br />`path`: cache path<br />`total_size`:
total size of the cache path, in bytes; 53687091200 bytes = 50 GB<br
/>`query_limit`: maximum data a single query can read from [...]
| Write | `write_buffer_size = 1073741824`
| Increase the write buffer file size to reduce
small files and random I/O, improving performance
|
-| Compaction | `max_cumu_compaction_threads = 8`
| Set to CPU cores / 4, meaning 1/4 of CPU is for
writes, 1/4 for background compaction, and 1/2 is reserved for queries and
other operations |
+| Compaction | `max_cumu_compaction_threads = 8` | For a 32-core BE, this
limits the cumulative compaction thread pool to 8 threads. CPU core count / 4
is only a tuning starting point, not a CPU quota or reservation. This setting
does not allocate CPU to ingestion, queries, or base compaction; adjust it
using compaction backlog and workload measurements. |
| Compaction | `inverted_index_compaction_enable = true`
| Enable index compaction to reduce CPU consumption
during compaction
|
| Compaction | `enable_segcompaction = false`<br
/>`enable_ordered_data_compaction = false`
| Disable two
compaction features that are not needed in log scenarios
|
| Compaction | `enable_compaction_priority_scheduling = false`
| Low-priority compaction is limited to 2 tasks per
disk, which slows compaction speed
|
diff --git
a/i18n/zh-CN/docusaurus-plugin-content-docs/current/observability/log.md
b/i18n/zh-CN/docusaurus-plugin-content-docs/current/observability/log.md
index f25cb86c88c7..1660ae6f07a4 100644
--- a/i18n/zh-CN/docusaurus-plugin-content-docs/current/observability/log.md
+++ b/i18n/zh-CN/docusaurus-plugin-content-docs/current/observability/log.md
@@ -230,7 +230,7 @@ Apache Doris 通过以下两种机制支持 Flexible Schema：
| 存储 | `enable_file_cache = true`
| 开启文件缓存
|
| 存储 | `file_cache_path = [{"path": "/mnt/datadisk0/file_cache",
"total_size":53687091200, "query_limit": "10737418240"},{"path":
"/mnt/datadisk1/file_cache", "total_size":53687091200,"query_limit":
"10737418240"}]` | 配置冷数据的缓存路径与设置：<br
/>`path`：缓存路径<br />`total_size`：该缓存路径的总大小，单位字节，53687091200 字节 = 50 GB<br
/>`query_limit`：单次查询可从缓存路径查询的最大数据量，单位字节，10737418240 字节 = 10 GB |
| 写入 | `write_buffer_size = 1073741824`
| 增大写入缓冲区文件大小，减少小文件与随机 I/O，提升性能
|
-| Compaction | `max_cumu_compaction_threads = 8`
| 设为 CPU 核数 / 4，意味着 1/4 CPU 用于写入、1/4 用于后台
Compaction，1/2 留给查询和其他操作
|
+| Compaction | `max_cumu_compaction_threads = 8` | 以 32 核 BE 为例，将 Cumulative
Compaction 线程池限制为 8 个线程。CPU 核数 / 4 只是调优起点，不是 CPU 配额或预留比例。该配置不为导入、查询或 Base
Compaction 分配 CPU；请结合 Compaction 积压情况和实际负载调整。 |
| Compaction | `inverted_index_compaction_enable = true`
| 开启索引合并（Index Compaction），减少 Compaction 时的 CPU 消耗
|
| Compaction | `enable_segcompaction = false`<br
/>`enable_ordered_data_compaction = false`
| 关闭日志场景不需要的两个
Compaction 功能
|
| Compaction | `enable_compaction_priority_scheduling = false`
| 低优先级 Compaction 在一块盘上限制 2 个任务，会影响 Compaction 速度
|
diff --git
a/i18n/zh-CN/docusaurus-plugin-content-docs/version-3.x/data-operate/import/import-way/log-storage-analysis.md
b/i18n/zh-CN/docusaurus-plugin-content-docs/version-3.x/data-operate/import/import-way/log-storage-analysis.md
index aa2036aecde9..17643d48f73b 100644
---
a/i18n/zh-CN/docusaurus-plugin-content-docs/version-3.x/data-operate/import/import-way/log-storage-analysis.md
+++
b/i18n/zh-CN/docusaurus-plugin-content-docs/version-3.x/data-operate/import/import-way/log-storage-analysis.md
@@ -87,7 +87,7 @@
| - | `file_cache_path = [{"path": "/mnt/datadisk0/file_cache",
"total_size":53687091200, "query_limit": "10737418240"},{"path":
"/mnt/datadisk1/file_cache", "total_size":53687091200,"query_limit":
"10737418240"}]` | 配置冷数据的缓存路径和相关设置，具体配置说明如下：<br />`path`：缓存路径<br
/>`total_size`：该缓存路径的总大小，单位为字节，53687091200 字节等于 50 GB<br
/>`query_limit`：单次查询可以从缓存路径中查询的最大数据量，单位为字节，10737418240 字节等于 10 GB |
| 写入 | `write_buffer_size = 1073741824` |
增加写入缓冲区（buffer）的文件大小，减少小文件和随机 I/O 操作，提升性能。 |
| - | `max_tablet_version_num = 20000` |
配合建表的 time_series compaction 策略，允许更多版本暂时未合并。3.0.7 版本后不再需要，有单独的
time_series_max_tablet_version_num 配置 |
-| Compaction | `max_cumu_compaction_threads = 8` |
设置为 CPU 核数 / 4，意味着 CPU 资源的 1/4 用于写入，1/4 用于后台 Compaction，2/1 留给查询和其他操作。 |
+| Compaction | `max_cumu_compaction_threads = 8` | 以 32 核 BE 为例，将 Cumulative
Compaction 线程池限制为 8 个线程。CPU 核数 / 4 只是调优起点，不是 CPU 配额或预留比例。该配置不为导入、查询或 Base
Compaction 分配 CPU；请结合 Compaction 积压情况和实际负载调整。 |
| - | `inverted_index_compaction_enable = true` |
开启索引合并（index compaction），减少 Compaction 时的 CPU 消耗。 |
| - | `enable_segcompaction = false` `enable_ordered_data_compaction
= false` | 关闭日志场景不需要的两个 Compaction 功能。 |
| - | `enable_compaction_priority_scheduling = false` | 低优先级
compaction 在一块盘上限制 2 个任务，会影响 compaction 速度。 |
diff --git
a/i18n/zh-CN/docusaurus-plugin-content-docs/version-3.x/observability/log-storage-analysis.md
b/i18n/zh-CN/docusaurus-plugin-content-docs/version-3.x/observability/log-storage-analysis.md
index ac532a01f6a6..532a1ff69d4d 100644
---
a/i18n/zh-CN/docusaurus-plugin-content-docs/version-3.x/observability/log-storage-analysis.md
+++
b/i18n/zh-CN/docusaurus-plugin-content-docs/version-3.x/observability/log-storage-analysis.md
@@ -87,7 +87,7 @@
| - | `file_cache_path = [{"path": "/mnt/datadisk0/file_cache",
"total_size":53687091200, "query_limit": "10737418240"},{"path":
"/mnt/datadisk1/file_cache", "total_size":53687091200,"query_limit":
"10737418240"}]` | 配置冷数据的缓存路径和相关设置，具体配置说明如下：<br />`path`：缓存路径<br
/>`total_size`：该缓存路径的总大小，单位为字节，53687091200 字节等于 50 GB<br
/>`query_limit`：单次查询可以从缓存路径中查询的最大数据量，单位为字节，10737418240 字节等于 10 GB |
| 写入 | `write_buffer_size = 1073741824` |
增加写入缓冲区（buffer）的文件大小，减少小文件和随机 I/O 操作，提升性能。 |
| - | `max_tablet_version_num = 20000` |
配合建表的 time_series compaction 策略，允许更多版本暂时未合并。 |
-| Compaction | `max_cumu_compaction_threads = 8` |
设置为 CPU 核数 / 4，意味着 CPU 资源的 1/4 用于写入，1/4 用于后台 Compaction，2/1 留给查询和其他操作。 |
+| Compaction | `max_cumu_compaction_threads = 8` | 以 32 核 BE 为例，将 Cumulative
Compaction 线程池限制为 8 个线程。CPU 核数 / 4 只是调优起点，不是 CPU 配额或预留比例。该配置不为导入、查询或 Base
Compaction 分配 CPU；请结合 Compaction 积压情况和实际负载调整。 |
| - | `inverted_index_compaction_enable = true` |
开启索引合并（index compaction），减少 Compaction 时的 CPU 消耗。 |
| - | `enable_segcompaction = false` `enable_ordered_data_compaction
= false` | 关闭日志场景不需要的两个 Compaction 功能。 |
| - | `enable_compaction_priority_scheduling = false` | 低优先级
compaction 在一块盘上限制 2 个任务，会影响 compaction 速度。 |
diff --git
a/i18n/zh-CN/docusaurus-plugin-content-docs/version-3.x/observability/log.md
b/i18n/zh-CN/docusaurus-plugin-content-docs/version-3.x/observability/log.md
index 9824f49d61ea..7a4529e73e9a 100644
--- a/i18n/zh-CN/docusaurus-plugin-content-docs/version-3.x/observability/log.md
+++ b/i18n/zh-CN/docusaurus-plugin-content-docs/version-3.x/observability/log.md
@@ -94,7 +94,7 @@
| - | `file_cache_path = [{"path": "/mnt/datadisk0/file_cache",
"total_size":53687091200, "query_limit": "10737418240"},{"path":
"/mnt/datadisk1/file_cache", "total_size":53687091200,"query_limit":
"10737418240"}]` | 配置冷数据的缓存路径和相关设置，具体配置说明如下：<br />`path`：缓存路径<br
/>`total_size`：该缓存路径的总大小，单位为字节，53687091200 字节等于 50 GB<br
/>`query_limit`：单次查询可以从缓存路径中查询的最大数据量，单位为字节，10737418240 字节等于 10 GB |
| 写入 | `write_buffer_size = 1073741824` |
增加写入缓冲区（buffer）的文件大小，减少小文件和随机 I/O 操作，提升性能。 |
| - | `max_tablet_version_num = 20000` |
配合建表的 time_series compaction 策略，允许更多版本暂时未合并。 |
-| Compaction | `max_cumu_compaction_threads = 8` |
设置为 CPU 核数 / 4，意味着 CPU 资源的 1/4 用于写入，1/4 用于后台 Compaction，2/1 留给查询和其他操作。 |
+| Compaction | `max_cumu_compaction_threads = 8` | 以 32 核 BE 为例，将 Cumulative
Compaction 线程池限制为 8 个线程。CPU 核数 / 4 只是调优起点，不是 CPU 配额或预留比例。该配置不为导入、查询或 Base
Compaction 分配 CPU；请结合 Compaction 积压情况和实际负载调整。 |
| - | `inverted_index_compaction_enable = true` |
开启索引合并（index compaction），减少 Compaction 时的 CPU 消耗。 |
| - | `enable_segcompaction = false` `enable_ordered_data_compaction
= false` | 关闭日志场景不需要的两个 Compaction 功能。 |
| - | `enable_compaction_priority_scheduling = false` | 低优先级
compaction 在一块盘上限制 2 个任务，会影响 compaction 速度。 |
diff --git
a/i18n/zh-CN/docusaurus-plugin-content-docs/version-4.x/observability/log.md
b/i18n/zh-CN/docusaurus-plugin-content-docs/version-4.x/observability/log.md
index f25cb86c88c7..1660ae6f07a4 100644
--- a/i18n/zh-CN/docusaurus-plugin-content-docs/version-4.x/observability/log.md
+++ b/i18n/zh-CN/docusaurus-plugin-content-docs/version-4.x/observability/log.md
@@ -230,7 +230,7 @@ Apache Doris 通过以下两种机制支持 Flexible Schema：
| 存储 | `enable_file_cache = true`
| 开启文件缓存
|
| 存储 | `file_cache_path = [{"path": "/mnt/datadisk0/file_cache",
"total_size":53687091200, "query_limit": "10737418240"},{"path":
"/mnt/datadisk1/file_cache", "total_size":53687091200,"query_limit":
"10737418240"}]` | 配置冷数据的缓存路径与设置：<br
/>`path`：缓存路径<br />`total_size`：该缓存路径的总大小，单位字节，53687091200 字节 = 50 GB<br
/>`query_limit`：单次查询可从缓存路径查询的最大数据量，单位字节，10737418240 字节 = 10 GB |
| 写入 | `write_buffer_size = 1073741824`
| 增大写入缓冲区文件大小，减少小文件与随机 I/O，提升性能
|
-| Compaction | `max_cumu_compaction_threads = 8`
| 设为 CPU 核数 / 4，意味着 1/4 CPU 用于写入、1/4 用于后台
Compaction，1/2 留给查询和其他操作
|
+| Compaction | `max_cumu_compaction_threads = 8` | 以 32 核 BE 为例，将 Cumulative
Compaction 线程池限制为 8 个线程。CPU 核数 / 4 只是调优起点，不是 CPU 配额或预留比例。该配置不为导入、查询或 Base
Compaction 分配 CPU；请结合 Compaction 积压情况和实际负载调整。 |
| Compaction | `inverted_index_compaction_enable = true`
| 开启索引合并（Index Compaction），减少 Compaction 时的 CPU 消耗
|
| Compaction | `enable_segcompaction = false`<br
/>`enable_ordered_data_compaction = false`
| 关闭日志场景不需要的两个
Compaction 功能
|
| Compaction | `enable_compaction_priority_scheduling = false`
| 低优先级 Compaction 在一块盘上限制 2 个任务，会影响 Compaction 速度
|
diff --git
a/versioned_docs/version-3.x/data-operate/import/import-way/log-storage-analysis.md
b/versioned_docs/version-3.x/data-operate/import/import-way/log-storage-analysis.md
index 2c43a0d06696..6819b0b0b289 100644
---
a/versioned_docs/version-3.x/data-operate/import/import-way/log-storage-analysis.md
+++
b/versioned_docs/version-3.x/data-operate/import/import-way/log-storage-analysis.md
@@ -190,7 +190,7 @@ You can find BE configuration fields in `be/conf/be.conf`.
Refer to the followin
| - | `file_cache_path = [{"path": "/mnt/datadisk0/file_cache",
"total_size":53687091200, "query_limit": "10737418240"},{"path":
"/mnt/datadisk1/file_cache", "total_size":53687091200,"query_limit":
"10737418240"}]` | Configure the cache path and related settings for cold data
with the following specific configurations:<br/>`path`: cache
path<br/>`total_size`: total size of the cache path in bytes, where 53687091200
bytes equals 50 GB<br/>`query_limit`: maximum amount of data tha [...]
| Write | `write_buffer_size = 1073741824` |
Increase the file size of the write buffer to reduce small files and random I/O
operations, improving performance. |
| - | `max_tablet_version_num = 20000` |
In coordination with the time_series compaction strategy for table creation,
allow more versions to remain temporarily unmerged. No longer required after
version 3.0.7, as there is a time_series_max_tablet_version_num configuration |
-| Compaction | `max_cumu_compaction_threads = 8` |
Set to CPU core count / 4, indicating that 1/4 of CPU resources are used for
writing, 1/4 for background compaction, and 2/1 for queries and other
operations. |
+| Compaction | `max_cumu_compaction_threads = 8` | For a 32-core BE, this
limits the cumulative compaction thread pool to 8 threads. CPU core count / 4
is only a tuning starting point, not a CPU quota or reservation. This setting
does not allocate CPU to ingestion, queries, or base compaction; adjust it
using compaction backlog and workload measurements. |
| - | `inverted_index_compaction_enable = true` |
Enable inverted index compaction to reduce CPU consumption during compaction. |
| - | `enable_segcompaction = false` `enable_ordered_data_compaction
= false` | Disable two compaction features that are unnecessary for log
scenarios. |
| - | `enable_compaction_priority_scheduling = false` | Low-priority
compaction is limited to 2 tasks on a single disk, which can affect the speed
of compaction. |
diff --git a/versioned_docs/version-3.x/observability/log.md
b/versioned_docs/version-3.x/observability/log.md
index 38407e565ee1..ba0355736345 100644
--- a/versioned_docs/version-3.x/observability/log.md
+++ b/versioned_docs/version-3.x/observability/log.md
@@ -104,7 +104,7 @@ You can find BE configuration fields in `be/conf/be.conf`.
Refer to the followin
| - | `file_cache_path = [{"path": "/mnt/datadisk0/file_cache",
"total_size":53687091200, "query_limit": "10737418240"},{"path":
"/mnt/datadisk1/file_cache", "total_size":53687091200,"query_limit":
"10737418240"}]` | Configure the cache path and related settings for cold data
with the following specific configurations:<br/>`path`: cache
path<br/>`total_size`: total size of the cache path in bytes, where 53687091200
bytes equals 50 GB<br/>`query_limit`: maximum amount of data tha [...]
| Write | `write_buffer_size = 1073741824` |
Increase the file size of the write buffer to reduce small files and random I/O
operations, improving performance. |
| - | `max_tablet_version_num = 20000` |
In coordination with the time_series compaction strategy for table creation,
allow more versions to remain temporarily unmerged |
-| Compaction | `max_cumu_compaction_threads = 8` |
Set to CPU core count / 4, indicating that 1/4 of CPU resources are used for
writing, 1/4 for background compaction, and 2/1 for queries and other
operations. |
+| Compaction | `max_cumu_compaction_threads = 8` | For a 32-core BE, this
limits the cumulative compaction thread pool to 8 threads. CPU core count / 4
is only a tuning starting point, not a CPU quota or reservation. This setting
does not allocate CPU to ingestion, queries, or base compaction; adjust it
using compaction backlog and workload measurements. |
| - | `inverted_index_compaction_enable = true` |
Enable inverted index compaction to reduce CPU consumption during compaction. |
| - | `enable_segcompaction = false` `enable_ordered_data_compaction
= false` | Disable two compaction features that are unnecessary for log
scenarios. |
| - | `enable_compaction_priority_scheduling = false` | Low-priority
compaction is limited to 2 tasks on a single disk, which can affect the speed
of compaction. |
diff --git a/versioned_docs/version-3.x/practical-guide/log-storage-analysis.md
b/versioned_docs/version-3.x/practical-guide/log-storage-analysis.md
index 9ad4259adcdc..5ca122092da3 100644
--- a/versioned_docs/version-3.x/practical-guide/log-storage-analysis.md
+++ b/versioned_docs/version-3.x/practical-guide/log-storage-analysis.md
@@ -190,7 +190,7 @@ You can find BE configuration fields in `be/conf/be.conf`.
Refer to the followin
| - | `file_cache_path = [{"path": "/mnt/datadisk0/file_cache",
"total_size":53687091200, "query_limit": "10737418240"},{"path":
"/mnt/datadisk1/file_cache", "total_size":53687091200,"query_limit":
"10737418240"}]` | Configure the cache path and related settings for cold data
with the following specific configurations:<br/>`path`: cache
path<br/>`total_size`: total size of the cache path in bytes, where 53687091200
bytes equals 50 GB<br/>`query_limit`: maximum amount of data tha [...]
| Write | `write_buffer_size = 1073741824` |
Increase the file size of the write buffer to reduce small files and random I/O
operations, improving performance. |
| - | `max_tablet_version_num = 20000` |
In coordination with the time_series compaction strategy for table creation,
allow more versions to remain temporarily unmerged |
-| Compaction | `max_cumu_compaction_threads = 8` |
Set to CPU core count / 4, indicating that 1/4 of CPU resources are used for
writing, 1/4 for background compaction, and 2/1 for queries and other
operations. |
+| Compaction | `max_cumu_compaction_threads = 8` | For a 32-core BE, this
limits the cumulative compaction thread pool to 8 threads. CPU core count / 4
is only a tuning starting point, not a CPU quota or reservation. This setting
does not allocate CPU to ingestion, queries, or base compaction; adjust it
using compaction backlog and workload measurements. |
| - | `inverted_index_compaction_enable = true` |
Enable inverted index compaction to reduce CPU consumption during compaction. |
| - | `enable_segcompaction = false` `enable_ordered_data_compaction
= false` | Disable two compaction features that are unnecessary for log
scenarios. |
| - | `enable_compaction_priority_scheduling = false` | Low-priority
compaction is limited to 2 tasks on a single disk, which can affect the speed
of compaction. |
diff --git a/versioned_docs/version-4.x/observability/log.md
b/versioned_docs/version-4.x/observability/log.md
index be4606cdbb21..33c831e112f8 100644
--- a/versioned_docs/version-4.x/observability/log.md
+++ b/versioned_docs/version-4.x/observability/log.md
@@ -230,7 +230,7 @@ In `be/conf/be.conf`, adjust the BE configurations
according to the following ta
| Storage | `enable_file_cache = true`
| Enable file cache
|
| Storage | `file_cache_path = [{"path": "/mnt/datadisk0/file_cache",
"total_size":53687091200, "query_limit": "10737418240"},{"path":
"/mnt/datadisk1/file_cache", "total_size":53687091200,"query_limit":
"10737418240"}]` | Configure the cache
paths and settings for cold data:<br />`path`: cache path<br />`total_size`:
total size of the cache path, in bytes; 53687091200 bytes = 50 GB<br
/>`query_limit`: maximum data a single query can read from [...]
| Write | `write_buffer_size = 1073741824`
| Increase the write buffer file size to reduce
small files and random I/O, improving performance
|
-| Compaction | `max_cumu_compaction_threads = 8`
| Set to CPU cores / 4, meaning 1/4 of CPU is for
writes, 1/4 for background compaction, and 1/2 is reserved for queries and
other operations |
+| Compaction | `max_cumu_compaction_threads = 8` | For a 32-core BE, this
limits the cumulative compaction thread pool to 8 threads. CPU core count / 4
is only a tuning starting point, not a CPU quota or reservation. This setting
does not allocate CPU to ingestion, queries, or base compaction; adjust it
using compaction backlog and workload measurements. |
| Compaction | `inverted_index_compaction_enable = true`
| Enable index compaction to reduce CPU consumption
during compaction
|
| Compaction | `enable_segcompaction = false`<br
/>`enable_ordered_data_compaction = false`
| Disable two
compaction features that are not needed in log scenarios
|
| Compaction | `enable_compaction_priority_scheduling = false`
| Low-priority compaction is limited to 2 tasks per
disk, which slows compaction speed
|
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