.. _PSMDB-4.0.28-23:

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*Percona Server for MongoDB* 4.0.28-23
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:Date: February 23, 2022
:Installation: `Installing Percona Server for MongoDB <https://www.percona.com/doc/percona-server-for-mongodb/4.0/install/index.html>`_

Percona Server for MongoDB 4.0.28 is an enhanced, source available, and highly-scalable database that is a
fully-compatible, drop-in replacement for MongoDB 4.0.28 Community Edition. It supports MongoDB 4.0.28 protocols and drivers.

.. admonition:: Reminder

   MongoDB 4.0 is scheduled to go `End of Life on April 30, 2022 <https://www.mongodb.com/support-policy/legacy>`_.
   Please plan your upgrades accordingly. To learn more about Percona’s software and services life cycle policies, see `Percona Release Lifecycle Overview <https://www.percona.com/services/policies/percona-software-support-lifecycle>`_ and `Percona Services Lifecycle Policy <https://www.percona.com/services/policies/percona-services-lifecycle-policy>`_.
      

Release Highlights
==================

* `SERVER-59929 <https://jira.mongodb.org/browse/SERVER-59929>`_ - Fixed issue from versions 4.0.26 and below that caused slower update and insert times related to ``splitChunk`` and ``moveChunk`` operations.
* `SERVER-55648 <https://jira.mongodb.org/browse/SERVER-55648>`_ - Resolved issues related to failures in retryable writes in case of shutdowns.
* `SERVER-62065 <https://jira.mongodb.org/browse/SERVER-62065>`_ - Added the ``repairShardedCollectionChunksHistory`` command to restore ``history`` fields for some chunks. This aims to fix broken snapshot reads and distributed transactions.
* `SERVER-54064 <https://jira.mongodb.org/browse/SERVER-54064>`_ - Added periodic clean up of logical sessions cache on arbiters
* `SERVER-45953 <https://jira.mongodb.org/browse/SERVER-45953>`_ - Exempted internal replication oplog readers from acquiring read tickets in order to avoid deadlocks
  
Find the full list of changes in the `MongoDB 4.0.28 Community Edition release notes <https://docs.mongodb.com/v4.0/release-notes/4.0/#january-31-2022>`_.