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Percona Software for MongoDB Documentation

Percona Distribution for MongoDB 5.0.26 (2024-04-09)

Installation

Percona Distribution for MongoDB is a freely available MongoDB database alternative, giving you a single solution that combines enterprise components from the open source community, designed and tested to work together. The aim of Percona Distribution for MongoDB is to enable you to run and operate your MongoDB efficiently with the data being consistently backed up.

Percona Distribution for MongoDB includes the following components:

  • Percona Server for MongoDB is a fully compatible source-available, drop-in replacement for MongoDB.

  • Percona Backup for MongoDB is a distributed, low-impact solution for achieving consistent backups of MongoDB sharded clusters and replica sets.

This release of Percona Distribution for MongoDB is based on Percona Server for MongoDB 5.0.26-22 and Percona Backup for MongoDB 2.4.1.

Warning

Due to CVE-2024-1351, in all MongoDB versions prior to 4.4.29, the mongod server allows incoming connections to skip peer certificate validation which results in untrusted connections to succeed. This issue occurs when the mongod is started with TLS enabled (net.tls.mode set to allowTLS, preferTLS, or requireTLS) and without a net.tls.CAFile configured. For details, see SERVER-72839.

The issue is fixed upstream in versions 4.4.29, 5.0.25, 6.0.14 and 7.0.6 and in Percona Server for MongoDB 4.4.29-28, 5.0.26-22, 6.0.14-11 and 7.0.7-4. Now, configuring MongoDB to use TLS requires specifying the value for the --tlsCAFile flag, the net.tls.CAFileconfiguration option, or the tlsUseSystemCA parameter.

Release Highlights

The bug fixes and improvements provided by MongoDB and included in Percona Server for MongoDB are the following:

  • Fixed the issue with the exceptions thrown while generating command response leading to network error by avoiding closing the connections during the command processing.
  • Changed the requirement to use exclusive write lock to intent exclusive write lock that doesn’t prevent reading from a collection during the $out stage when running the rename collection command.
  • Fixed the issue with the match expression optimization for the $or to an $in rewrite by avoiding creating directly nested $or.
  • Fixed the issue with the resharding command failing to persist chunk metadata by adding a validation that the user provided zone range doesn’t include $-prefixed fields.
  • Fixed the issue with missing peer certificate validation if neither CAFile nor clusterCAFile is provided.
  • Extended the collMod command to check and fix invalid boolean index options.
  • Fixed the issue with multi-document transactions missing documents when the movePrimary operation runs concurrently by detecting placement conflicts in multi-document transactions.
  • Added an index on the process field for the config.locks collection to ensure update operations on it are completed even in heavy loaded deployments.
  • Removed the unstable historical versions at the end of rollback to stable.

Percona Backup for MongoDB 2.4.x improvements are the following:

  • Ability to delete backup snapshots of a specific type. For example, you can delete only logical backups which you might have created and no longer need. You can also check what exactly will be deleted with the new --dry-run flag. This improvement helps you better meet the organization’s backup policy and improves your experience with cleaning up outdated data.
  • Point-in-time recovery oplog slicing is now running in parallel with backup snapshots. This ensures that you can make a point-in-time recovery to any timestamp from very large backups that take hours to make.
  • Fixed the issue with failing incremental backups. It was caused by the backup metadata document reaching the maximum size limit of 16MB. The issue is fixed by introducing the new approach of handling the metadatada document: it no longer contains the list of backup files which is now stored separately on the storage and is read by PBM on demand. The new metadata handling approach applies to physical, incremental and shapshot-based backups.

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Last update: June 19, 2024
Created: April 9, 2024