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Percona Software for MongoDB Documentation

Percona Server for MongoDB 7.0.8-5 (2024-04-24)

Installation

Percona Server for MongoDB 7.0.8-5 is an enhanced, source-available, and highly-scalable database that is a fully-compatible, drop-in replacement for MongoDB Community Edition 7.0.8.

Percona Server for MongoDB 7.0.8-5 is based on MongoDB 7.0.8 Community Edition and supports the upstream protocols and drivers.

Release Highlights

A number of issues with sharded multi-document transactions in sharded clusters of 2 or more shards have been identified that result in returning incorrect results and missing reads and writes. The issues occur when the transactions’ metadata is being concurrently modified by using the following operations: moveChunk, moveRange, movePrimary, renameCollection, drop, and reshardCollection.

The data is affected when using the following functionalities:

  • Sharded multi-document transactions
  • Queryable encryption

The issues are fully fixed in MongoDB 4.4.29, 5.0.25, 6.0.14, 7.0.8, and are included in Percona Server for MongoDB 4.4.29-28, 5.0.26-22,6.0.14-11 and 7.0.8-5. If you are using sharded multi-document transactions or queryable encryption, upgrade to Percona Server for MongoDB 7.0.8-5 as soon as possible. Please follow closely the upstream recommendations for mitigation and remediation outlined in Sharded multi-document transactions may perform operations using inconsistent sharding metadata alert.

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

  • SERVER-86583 - Fixed the issue with reads returning incomplete results and mismatched sharding metadata when performed on sharded collections with the readConcern: snapshot and an atClusterTime values. The issue occurs if the following conditions apply to collections:

    • a collection is sharded at either the time of the read or at the atClusterTime.
    • a collection is dropped after the time atClusterTime
    • a collection is recreated as non-sharded after being dropped.

    The issue affects MongoDB versions 7.0.0 through 7.0.7. It is fixed upstream in 7.0.8 and is included in Percona Server for MongoDB 7.0.8-5. Follow the upstream recommendations for workaround and remediation.

  • SERVER-78556 - Fixed the issue with the replication lag by changing the internalInsertMaxBatchSize default value to 64

  • SERVER-79575 - Fixed NUMA (Non-Uniform Memory Access) nodes counting
  • SERVER-87666 - Ensured that query shape for $documents stage in an aggregation pipeline is unique on each execution.

Find the full list of changes in the MongoDB 7.0.8 Community Edition release notes.

Bugs Fixed

  • PSMDB-1418 - Fixed the issue with the server crash when using LDAP authentication by ensuring that LDAP connections borrowed by a client thread are not disposed.

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