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docs/release_notes/7.0.21-12.md

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Percona Server for MongoDB 7.0.21-12 is an enhanced, source-available, and highly-scalable database that is a
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fully-compatible, drop-in replacement for MongoDB Community Edition.
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Percona Server for MongoDB 7.0.21-12 includes the improvements and bug fixes of [MongoDB 7.0.19 Community Edition](https://www.mongodb.com/docs/manual/release-notes/7.0/#7.0.19---apr-14--2025) through [MongoDB 7.0.21 Community Edition](https://www.mongodb.com/docs/manual/release-notes/7.0/#7.0.21---upcoming). It supports protocols and drivers of MongoDB versions 7.0.19 - 7.0.21.
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Percona Server for MongoDB 7.0.21-12 includes the improvements and bug fixes of [MongoDB 7.0.19 Community Edition](https://www.mongodb.com/docs/manual/release-notes/7.0/#7.0.19---apr-14--2025) through [MongoDB 7.0.21 Community Edition](https://www.mongodb.com/docs/manual/release-notes/7.0/#7.0.21---jun-04--2025). It supports protocols and drivers of MongoDB versions 7.0.19 - 7.0.21.
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## Release highlights
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This release provides the following features and improvements:
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### Boost performance during cluster restore and scaling with file copy based initial sync
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### Boost performance during cluster restore and scaling with file copy-based initial sync
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You can now select how a newly added or a restored replica set member receives the data from other members - via logical or file copy based sync. File copy based sync is the copying of physical files rather than actual data clone. This makes this sync method is faster than the logical one and it reduces your maintenance time on scaling.
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You can now select how a newly added or a restored replica set member synchronizes the data from other members - via logical or file copy-based initial sync. File copy-based initial sync copies physical files from the source node. This sync method is faster than the logical one and it reduces your maintenance time on scaling your cluster.
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This functionality is available in [Percona Server for MongoDB Pro](../psmdb-pro.md) out of the box. Become a Percona Customer to enjoy all Pro features with little to no effort from your side.
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This feature is available in [Percona Server for MongoDB Pro](../psmdb-pro.md) out of the box. Become a Percona Customer to enjoy all Pro features with little to no effort from your side. Alternatively, you can receive it by building Percona Server from the source code.
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### Packaging changes
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Percona Server for MongoDB 7.0.21-12 is no longer supported on Ubuntu 20.04 (Focal Fossa) as this operating system has reached end of life. If youre not ready to upgrade to a newer Ubuntu OS but still want to update Percona Server for MongoDB, contact us! We're here to make your databases run better.
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Percona Server for MongoDB 7.0.21-12 is no longer supported on Ubuntu 20.04 (Focal Fossa) as this operating system has reached end of life. If you're not ready to upgrade to a newer Ubuntu OS but still want to update Percona Server for MongoDB, [contact us](https://hubs.ly/Q03rRtDg0)! We're here to make your databases run better.
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### Upstream Improvements
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The bug fixes, provided by MongoDB Community and included in Percona Server for MongoDB, are the following:
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* [SERVER-93120](https://jira.mongodb.org/browse/SERVER-93120) - Fixed the issue with blocking Full Time Diagnostic Data Capture (FTDC) collection when checking the state of the bacupCursor by using atomic mode instead of a lock
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* [SERVER-93120](https://jira.mongodb.org/browse/SERVER-93120) - Fixed the issue with blocking Full Time Diagnostic Data Capture (FTDC) collection when checking the state of the `$backupCursor` by using atomic mode instead of a lock
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* [SERVER-92806](https://jira.mongodb.org/browse/SERVER-92806) - Tracked nested paths through MatchExpression trees while encoding indexability for plan cache entries
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* [SERVER-95672](https://jira.mongodb.org/browse/SERVER-95672) - Fixed the issue with missing documents when indexes on array fields contain subarrays by ensuring proper bounds when having nested arrays as predicates
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* [SERVER-97044](https://jira.mongodb.org/browse/SERVER-97044) - Fixed an issue where change streams might incorrectly output a "drop" event during resharding or unsharding of a collection that is or was using zone sharding
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* [WT-12012](https://jira.mongodb.org/browse/WT-12012) - Fixed the issue when a generation drain process in WiredTiger, which manages eviction of older data, encounters an issue and then resolves itself when the verbosity levels for eviction and checkpoint operations increase. The issue is fixed by restoring original verbosity levels for these operations.
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* [SERVER-106752](https://jira.mongodb.org/browse/SERVER-106752) - Prevented unauthorized access to data by improving the handling of the `$mergeCursors stage`. The issue affects MongoDB versions prior to 7.0.20 and is fixed upstream and included in Percona Server for MongoDB. We recommend users to upgrade to the latest version as soon as possible.
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* [SERVER-106753](https://jira.mongodb.org/browse/SERVER-106753) - Fixed the issue with incorrect handling of incomplete data that may prevent `mongos` from accepting new connections. The issue affects deployments configured to use a load balancer like HAProxy and affects Percona Server for MongoDB Server v6.0 prior to 6.0.23, Percona Server for MongoDB Server v7.0 prior to 7.0.20 and Percona Server for MongoDB Server v8.0 prior to 8.0.9. We recommend users to upgrade to the latest version as soon as possible.
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Find the full list of changes in the release notes of [MongoDB 7.0.19 Community Edition](https://www.mongodb.com/docs/manual/release-notes/7.0/#7.0.19---apr-14--2025) through [MongoDB 7.0.21 Community Edition release notes](https://www.mongodb.com/docs/manual/release-notes/7.0/#7.0.21---upcoming).
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Find the full list of changes in the release notes of [MongoDB 7.0.19 Community Edition](https://www.mongodb.com/docs/manual/release-notes/7.0/#7.0.19---apr-14--2025), [MongoDB 7.0.20 Community Edition](https://www.mongodb.com/docs/manual/release-notes/7.0/#7.0.20---apr-29--2025) and [MongoDB 7.0.21 Community Edition release notes](https://www.mongodb.com/docs/manual/release-notes/7.0/#7.0.21---jun-04--2025).
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## Changelog
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### New Features
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* [PSMDB-1284](https://perconadev.atlassian.net/browse/PSMDB-1284) - Add the ability to perform file copy-based initial sync
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### Improvements
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* [PSMDB-1619](https://perconadev.atlassian.net/browse/PSMDB-1619) - Make log rotation behavior compatible with MongoDB by renaming existing log file to a name with a timestamp and start a new one
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* [PSMDB-1633](https://perconadev.atlassian.net/browse/PSMDB-1633) - Implemented 'encryptionAtRest' field in 'serverStatus()'
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* [PSMDB-1634](https://perconadev.atlassian.net/browse/PSMDB-1634) - Improved the `mongod.1` manpage by adding reference to official documentation
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### Fixed Bugs
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* [PSMDB-1615](https://perconadev.atlassian.net/browse/PSMDB-1615) - Fixed the issue with corrupt/unusable debug files in RPM-based systems for Percona Server for MongoDB 6, 7 and 8
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* [PSMDB-1679](https://perconadev.atlassian.net/browse/PSMDB-1679) - Fixed the issue with Percona Server for MongoDB not starting with custom configurations (Thank you Ilnar Gabidullin for reporting this issue)
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* [PSMDB-1712](https://perconadev.atlassian.net/browse/PSMDB-1712) - Fixed the issue with the server сrash accessing LDAP by improving the `start_poll` function behavior
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* [PSMDB-1730](https://perconadev.atlassian.net/browse/PSMDB-1730) - Fixed the issue with LDAP authentication via SASL by adding the package `cyrus-sasl-plain` in Docker images for Percona Server for MongoDB 6, 7 and 8
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