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DOCS-14391 add replWriterMinThreadCount param #5440

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Jun 14, 2021
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DOCS-14391 add replWriterMinThreadCount param #5440

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33 changes: 31 additions & 2 deletions source/reference/parameters.txt
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Expand Up @@ -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
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10 changes: 10 additions & 0 deletions source/release-notes/5.0.txt
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Expand Up @@ -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
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