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Kernel Version Description

Updated on 2024-12-17 GMT+08:00

This section describes the kernel version updates of Document Database Service (DDS). This upgrade does not affect any functions or APIs.

Table 1 DDS 5.0 version updates

Version

Date

Description

5.0

September 2024

  • Index rebuilding can be skipped during restart, and the replica set index inconsistency can be automatically restored.
  • The maximum value of oldestTsWindow can be set to 100 seconds.
  • Supported the $sum, $shift, $last, and $first operators in the $setWindowFields aggregation stage.
  • Supported online hot modification of rocksdb blob.

August 2024

  • Supported the $sortArray operator.
  • Resolved the issue that the disk usage occasionally increases sharply after data backup.
  • Optimized the output and statistics modes of heapprofile.
  • Optimized index hits.
  • Resolved the issue that the config DB latency collected by mongotop is inaccurate.
  • Resolved the issue that the top command may cause high memory usage when tables are frequently created and deleted.

July 2024

  • Resolved the issue that the client cannot identify read replica IP addresses.
  • Supported sharded tables using $graphLookup.
Table 2 DDS 4.4 version updates

Version

Date

Description

4.4

September 2024

  • Index rebuilding can be skipped during restart, and the replica set index inconsistency can be automatically restored.
  • The maximum value of oldestTsWindow can be set to 100 seconds.
  • Resolved the issue that an OOM error occasionally occurs when tables are frequently created and deleted.

August 2024

  • Resolved the issue that the disk usage occasionally increases sharply after data backup.
  • Optimized the output and statistics modes of heapprofile.
  • Optimized index hits.
  • Resolved the issue that the config DB latency collected by mongotop is inaccurate.

July 2024

  • Resolved the issue that the client cannot identify read replica IP addresses.
  • Supported time roaming snapshots.
  • Supported sharded tables using $graphLookup.

June 2024

  • Both localField and foreignField can be specified when pipeline is specified for lookup.
  • Resolved the issue that setLogLevel shields storage layer logs.
  • Indexes can be specified using hints during update.

May 2024

  • Optimized the CPU usage of changeStream.
  • Resolved the problem that backup errors may occur when tables are deleted during backup.
  • Added the effectiveUsers field to the query result of the db.currentOp() command.
  • Supported mongo exporter.

April 2024

  • Supported sharded tables for $lookup.
  • Supported $startAfter for changeStream.
  • Optimized the performance of distributed transactions in shard primary/standby switchover scenarios.

March 2024

Resolved the problem that fields output by setWindowFields are missing.

February 2024

  • Optimized the read performance of changeStream.
  • Optimized the performance of clearing expired oplog data.
  • Resolved the problem that geoNear is not displayed when explain() is executed.

January 2024

Resolved the problem that there is a possibility that regular expression matching fails.

December 2023

  • Optimized the performance of querying a single document.
  • Restricted the permission to run a risky reIndex command.

November 2023

Resolved the problem that the command output is not displayed on the memory monitoring page after a command is executed.

October 2023

  • Optimized the method for obtaining locks by running the ServerStatus command.
  • Resolved the problem that there is a possibility that a secondary node fails to be promoted.

September 2023

  • Supported index and collection creation in multi-document transactions.
  • Supported autosplit setting for a single collection.
  • Fixed the bug that the performance is inconsistent with that of MongoDB 4.4 when you create sparse indexes and set find to null.

August 2023

  • Added the capability for proactively limiting the number of connections.
  • Added the compatibility with Parallel Change Stream.
  • Fixed the bug that aggregation commands can still be executed on cluster instances when read and write operations are disabled.
  • Optimized the method for capturing slow query logs.

July 2023

  • Optimized the compression algorithm of the storage engine.
  • Automatically routed the CreateIndex command to the primary node for execution.
  • Optimized the passive compact synchronization logic.

May 2023

Added totalTimeProcessingMicros, processingMethod, totalTimeTruncatingMicros and truncateCount to oplogTruncation in serverStatus.

April 2023

Optimized the transaction execution logic.

March 2023

  • Added automatic storage failover.
  • Supported the defaultReadWriteConcern for replica set instances.
  • Supported Point-In-Time Recovery (PITR) for cluster instances.

January 2023

  • Optimized the tcmalloc memory management policy.
  • Supported distributed large transactions.

November 2022

  • Added the compound hash index.
  • Added the mutable shard key values.
  • Added the compatibility with mirrored reads.
Table 3 DDS 4.2 version updates

Version

Date

Description

4.2

September 2024

  • Index rebuilding can be skipped during restart, and the replica set index inconsistency can be automatically restored.
  • The maximum value of oldestTsWindow can be set to 100 seconds.
  • Resolved the issue that an OOM error occasionally occurs when tables are frequently created and deleted.

August 2024

  • Resolved the issue that the disk usage occasionally increases sharply after data backup.
  • Optimized the output and statistics modes of heapprofile.
  • Optimized index hits.
  • Resolved the issue that the config DB latency collected by mongotop is inaccurate.

July 2024

  • Resolved the issue that the client cannot identify read replica IP addresses.
  • Supported time roaming snapshots.

June 2024

  • Resolved the issue that setLogLevel shields storage layer logs.

May 2024

  • Optimized the CPU usage of changeStream.
  • Added the effectiveUsers field to the query result of the db.currentOp() command.
  • Supported mongo exporter.

April 2024

Optimized the performance of distributed transactions in shard primary/standby switchover scenarios.

March 2024

Supported the startAfter feature.

February 2024

  • Optimized the read performance of changeStream.
  • Optimized the performance of clearing expired oplog data.
  • Resolved the problem that geoNear is not displayed when explain() is executed.

January 2024

Resolved the problem that there is a possibility that regular expression matching fails.

December 2023

  • Optimized the performance of querying a single document.
  • Restricted the permission to run a risky reIndex command.

November 2023

Resolved the problem that the command output is not displayed on the memory monitoring page after a command is executed.

October 2023

  • Optimized the method for obtaining locks by running the ServerStatus command.
  • Resolved the problem that there is a possibility that a secondary node fails to be promoted.

September 2023

  • Supported index and collection creation in multi-document transactions.
  • Supported autosplit setting for a single collection.

August 2023

  • Added the capability for proactively limiting the number of connections.
  • Fixed the bug that certain sessions are occasionally killed when there are locks.
  • Optimized the method for capturing slow query logs.

July 2023

  • Optimized the compression algorithm of the storage engine.
  • Automatically routed the CreateIndex command to the primary node for execution.
  • Optimized the passive compact synchronization logic.
  • Fixed the bug that the system session table occasionally fails to be updated due to the MongoDB open-source community vulnerability SERVER-39044.

June 2023

  • Optimized the performance of the update operation on a 10 KB document in a replica set.
  • Fixed the SERVER-37408 vulnerability.
  • Fixed the SERVER-39074 vulnerability.

May 2023

Resolved the writeConcern error code matching issue after a primary/standby switchover.

April 2023

  • Optimized the transaction execution logic.
  • Fixed the bug that the execution of dropIndexes() with specified parameters is inconsistent with that of MongoDB 4.2.
  • Fixed the bug that the restart is slow when emrc is set to true and dirty cache increases.

March 2023

  • Added automatic storage failover.
  • Reduced the primary/secondary replication delay.
  • Supported Point-In-Time Recovery (PITR) for cluster instances.

January 2023

  • Supported distributed large transactions.
  • Fixed the SERVER-42518 vulnerability.
  • Fixed the SERVER-37686 vulnerability.

November 2022

  • Fixed the bug that MongoDB Compass occasionally fails to be connected through SSL.
  • Fixed the bug that the performance is inconsistent with that of MongoDB 4.2 when find is set to null.

October 2022

  • Added index consistency check.
  • Fixed the CVE-2020-7921 vulnerability.

September 2022

  • Supported index creation in the background by default.
  • Opened the replSetGetConfig command.

June 2022

  • Supported the ZSTD compression algorithm.
  • Supported the releaseFreeMemory command for mongos nodes.
Table 4 DDS 4.0 version updates

Version

Date

Description

4.0

September 2024

  • Optimized the output and statistics modes of heapprofile.
  • Index rebuilding can be skipped during restart, and the replica set index inconsistency can be automatically restored.
  • Resolved the issue that an OOM error occasionally occurs when tables are frequently created and deleted.

August 2024

  • Optimized index hits.
  • Resolved the issue that the config DB latency collected by mongotop is inaccurate.

July 2024

  • Resolved the issue that the client cannot identify read replica IP addresses.

June 2024

Supported mongo exporter.

May 2024

None

April 2024

None

March 2024

None

February 2024

Resolved the problem that geoNear is not displayed when explain() is executed.

January 2024

Resolved the problem that there is a possibility that regular expression matching fails.

December 2023

  • Optimized the performance of querying a single document.
  • Restricted the permission to run a risky reIndex command.

November 2023

None

October 2023

  • Optimized the method for obtaining locks by running the ServerStatus command.
  • Resolved the problem that there is a possibility that a secondary node fails to be promoted.

September 2023

Optimized the resizeOplog logic.

August 2023

  • Fixed the bug that aggregation commands can still be executed on cluster instances when read and write operations are disabled.
  • Fixed the bug that certain sessions are occasionally killed when there are locks.
  • Optimized the method for capturing slow query logs.

July 2023

  • Automatically routed the CreateIndex command to the primary node for execution.
  • Optimized the passive compact synchronization logic.
  • Fixed the bug that the system session table occasionally fails to be updated due to the MongoDB open-source community vulnerability SERVER-39044.
  • Fixed the bug that NotMaster is displayed when a cluster instance is connected using Robot 3T and readPreference is set to secondaryPreferred by default.

June 2023

  • Provided the enableCheckPassword parameter to enable or disable password complexity check.
  • Optimized the index deletion procedure to improve efficiency.

May 2023

  • Fixed the SERVER-37408 vulnerability.
  • Fixed the SERVER-39074 vulnerability.

April 2023

  • Fixed the bug that the execution of dropIndexes() with specified parameters is inconsistent with that of MongoDB 4.2.
  • Fixed the bug that the restart is slow when emrc is set to true and dirty cache increases.

March 2023

  • Added automatic storage failover.
  • Fixed the CVE-2018-20805 vulnerability.

January 2023

  • Fixed the SERVER-42518 vulnerability.
  • Fixed the SERVER-37686 vulnerability.

November 2022

Fixed the bug that MongoDB Compass occasionally fails to be connected through SSL.

October 2022

  • Added index consistency check.
  • Fixed the CVE-2020-7921 vulnerability.

July 2022

  • Supported index creation in the background by default.
  • Opened the replSetGetConfig command.

June 2022

Supported the releaseFreeMemory command for mongos nodes.

Table 5 DDS 3.4 version updates

Version

Date

Description

3.4

September 2024

None

August 2024

None

July 2024

None

June 2024

None

May 2024

None

April 2024

Optimized aggregate query and supported mapping adding for $project.

March 2024

None

February 2024

None

January 2024

None

December 2023

Restricted the permission to run a risky reIndex command.

November 2023

None

October 2023

Optimized the method for obtaining locks by running the ServerStatus command.

September 2023

Displayed detailed slow query log information.

August 2023

  • Fixed the bug that aggregation commands can still be executed on cluster instances when read and write operations are disabled.
  • Fixed the bug that certain sessions are occasionally killed when there are locks.
  • Optimized the method for capturing slow query logs.

July 2023

Synchronized ReleaseFreeMemory to version 3.4.

May 2023

  • Fixed the SERVER-37408 vulnerability.
  • Fixed the SERVER-39074 vulnerability.

April 2023

Fixed the bug that the activeSession on the standby config node in a cluster is not updated in a timely manner.

March 2023

  • Added automatic storage failover.
  • Fixed the CVE-2018-20805 vulnerability.

January 2023

  • Fixed the SERVER-42518 vulnerability.
  • Fixed the SERVER-37686 vulnerability.

October 2022

  • Fixed the CVE-2020-7921 vulnerability.
  • Fixed the bug that the value of heapprofile is incorrect.

July 2022

Resolved the weak password verification issue.

June 2022

Supported mongos log anonymization.

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