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Percona Software for MongoDB Documentation

Percona Server for MongoDB 6.0.8-6 (2023-08-08)

Release date August 8, 2023
Installation Installing Percona Server for MongoDB

Percona Server for MongoDB 6.0.8-6 is an enhanced, source-available, and highly-scalable database that is a fully-compatible, drop-in replacement for MongoDB 6.0.7 and 6.0.8 Community Edition.

It supports protocols and drivers of both MongoDB 6.0.7 and 6.0.8.

This release of Percona Server for MongoDB includes the improvements and bug fixes of MongoDB 6.0.7 Community edition and MongoDB 6.0.8 Community edition.

Warning

We don’t recommend this version for production use due to the issue with routing sharding time series collections SERVER-80203 which could result in metadata inconsistency. The routing issue is observed when documents have the shard key containing the embedded object composed of multiple fields.

The issue affects time series sharded collections starting in MongoDB version 5.0.6 through versions 5.0.21, 6.0.11 and 7.0.2. It is fixed upstream in versions 5.0.22, 6.0.12 and 7.0.4 and included in Percona Server for MongoDB 5.0.22-19, 6.0.12-9 and 7.0.4-2.

If you are using time series collections, upgrade to the fixed version of MongoDB / Percona Server for MongoDB as soon as possible and follow closely the upstream recommendations outlined in SERVER-80203 for remediation steps.

Important

Changes to Chunk Management and Balancing

Several changes have been incrementally introduced within 6.0.x releases.

  • The name of a subset of data has changed from a chunk to a range.

  • The data size has changed from 64 MB for a chunk to 128 MB for a range.

  • The balancer now distributes ranges based on the actual data size of collections. Formerly the balancer migrated and balanced data across shards based strictly on the number of chunks of data that exist for a collection across each shard. This, combined with the auto-splitter process could cause quite a heavy performance impact to heavy write environments.

  • Ranges (formerly chunks) are no longer auto-split and will be split only when they move across shards for distribution purposes. The auto-splitter process is currently still available but it serves no purpose and does nothing active to the data. This also means that the Enable/Disable AutoSplit helpers should no longer be used.

The above changes are expected to lead to better performance overall going forward.

Release Highlights

Improvements and bug fixes, provided by MongoDB and included in Percona Server for MongoDB are the following:

  • SERVER-71985 - Automatically retry time series insert on DuplicateKey error.
  • SERVER-73007 - Added the CURL_OPT_SEEKFUNCTION to resend the data during multi-pass authentication
  • SERVER-74551 - Prevented unnecessary logging of WriteConflictExceptions during the execution of a findAndModify command.
  • SERVER-77018 - Changed the index build behavior so that in-progress index builds are no longer accounted for indexFreeStorageSize when running dbStats.
  • WT-10449 - Do not save update chain when there are no updates to be written to the history store.
  • WT-11031 - Fixed the Rollback to Stable behavior to skip tables with no time window information in the checkpoint.
  • SERVER-61127 - Retry multi-writes that hit StaleConfig due to critical section on the shard
  • SERVER-77005 - Improve LDAP authentication by leaving authenticated users logged-in during LDAP server downtime.
  • SERVER-78414 - Fixed the issue with lost writes that occurred if recipient shard in chunk migration skips changes by having recipient shard to run the transferMods command on the donor shard primary until it learns there are no further changes.
  • SERVER-77169 - Fixed the issue with the server crash when restoring time series collection with authentication enabled by validating the system.buckets. namespace.

Find the full list of new features and improvements in the release notes for MongoDB 6.0.7 Community edition and MongoDB 6.0.8 Community edition.

New Features

  • PSMDB-1291 - Add the ability to specify the AWS Security Token Service (STS) endpoint for authentication

Bugs Fixed

  • PSMDB-1280 - Improve PSMDB behavior on client disconnect when the $backupCursorExtend is opened
  • PSMDB-1289 - Fixed the issue with the server crash during LDAP authentication by retrying sending requests to the LDAP server and gracefully report errors.

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