From 3803e2e4453bcdb35b916b3a491f301e6602f089 Mon Sep 17 00:00:00 2001
From: andf-mongodb <andrew.feierabend@mongodb.com>
Date: Fri, 11 Jun 2021 16:27:45 -0400
Subject: [PATCH] DOCS-14391 add replWriterMinThreadCount param

---
 source/reference/parameters.txt | 33 +++++++++++++++++++++++++++++++--
 source/release-notes/5.0.txt    | 10 ++++++++++
 2 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/source/reference/parameters.txt b/source/reference/parameters.txt
index cce418988ba..2d218796f74 100644
--- a/source/reference/parameters.txt
+++ b/source/reference/parameters.txt
@@ -2237,11 +2237,40 @@ Logical Session
 
    |mongod-only|
 
-   Number of threads to use to apply replicated operations in parallel.
-   Values can range from 1 to 256 inclusive. You can only set
+   Maximum number of threads to use to apply replicated operations in
+   parallel. Values can range from 1 to 256 inclusive. You can only set
    :parameter:`replWriterThreadCount` at startup and cannot change this
    setting with the :dbcommand:`setParameter` command.
 
+   .. seealso::
+
+      :parameter:`replWriterMinThreadCount`
+
+.. parameter:: replWriterMinThreadCount
+
+   .. versionadded:: 5.0
+
+   *Type*: integer
+
+   *Default*: 0
+
+   |mongod-only|
+
+   Minimum number of threads to use to apply replicated operations in
+   parallel. Values can range from 0 to 256 inclusive. You can only set
+   :parameter:`replWriterMinThreadCount` at startup and cannot change
+   this setting with the :dbcommand:`setParameter` command.
+
+   Parallel application of replication operations uses up to
+   :parameter:`replWriterThreadCount` threads. If
+   :parameter:`replWriterMinThreadCount` is configured with a value
+   less than :parameter:`replWriterThreadCount`, the thread pool will
+   timeout idle threads until the total count of threads in the thread
+   pool is equal to :parameter:`replWriterMinThreadCount`.
+
+   :parameter:`replWriterMinThreadCount` must be configured with a value
+   that is less than or equal to :parameter:`replWriterThreadCount`.
+
 .. parameter:: rollbackTimeLimitSecs
 
    *Type*: 64-bit integer
diff --git a/source/release-notes/5.0.txt b/source/release-notes/5.0.txt
index 4774408f0ea..862d4cba278 100644
--- a/source/release-notes/5.0.txt
+++ b/source/release-notes/5.0.txt
@@ -201,6 +201,16 @@ Starting in MongoDB 5.0, the :rsconf:`members[n]._id` field may be any
 integer value greater than or equal to ``0``. Previously, this value was
 limited to an integer between ``0`` and ``255`` inclusive.
 
+Enhanced Thread Pool Timeout Control
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Starting in MongoDB 5.0, you can use the new
+:parameter:`replWriterMinThreadCount` server parameter to configure the
+timeout of idle threads in the thread pool for parallel execution of
+replication operations. When :parameter:`replWriterMinThreadCount` is
+configured with a value less than :parameter:`replWriterThreadCount`,
+idle threads above :parameter:`replWriterMinThreadCount` are timed out.
+
 .. _5.0-rel-notes-security:
 
 Security