What's New in This Guide

This section introduces the documentation updates for release 25.1.1xx.

Release 25.1.103 - G20393-04 - August 2025

Updated the Removing cnDBTier Cluster 1 section to specify which site should be used as the source when using dbtremovesite script.

Release 25.1.102 - G20393-03 - July 2025

Added a note in the Maintenance Procedures section to notify users to perform manual procedures or use fatal georeplication recovery procedures in case of any script failure during any operations.

Release 25.1.101 - G20393-02, May 2025

Added a note in the Scaling ndbmtd Pods section to provide the information about rerunning the dbt_reorg_table_partition script when a restart or a backup operation is ongoing.

Release 25.1.100 - G20393-01, April 2025

Feature Updates:

New Features:

Enhanced Georeplication Recovery using Parallel Backup Transfer and Restore:

• Added the Enhanced Georeplication Recovery using Parallel Backup Transfer and Restore section to provide an overview about this feature.
• Added the cnDBTier Parallel Backup Transfer Progress Metrics section to provide details about the metrics that are used to measure the parallel backup progress.

Storing ndbmtd Pod Logs in PVC:

• Added the Storing NDB Logs in PVC section to provide an overview about how the system stores NDB logs in PVC.

cnDBTier Cluster Events APIs:

• Added the Monitoring Cluster Events to Determine Data Loss in Clusters section to provide an overview about the cnDBTier cluster event APIs and their usage.
• Added the cnDBTier Cluster Events APIs section to provide details about the APIs that are used to retrieve cluster event details and update the cluster status.
• Updated the description of the db_tier_cluster_disconnect metric in the cnDBTier Node Status Metrics section.
• Updated the Summary, Condition, and Recommended Actions columns of the MYSQL_NDB_CLUSTER_DISCONNECT alert in the cnDBTier Cluster Status Alerts section.

Feature Enhancement:

Support for TLS:

• Updated the feature description in the Support for TLS section to include details about enabling and configuring TLS in application SQL pod to establish a secure connection for communication between cnDBTier and Network Functions (NFs).
• Restructured and added the following sub-sections in the Managing TLS section to provide the procedures to enable TLS and modify cnDBTier certificates:
  • Managing TLS for Communication with NFs
  • Enabling TLS for Communication with NFs
  • Modifying cnDBTier Certificates to Establish TLS for Communication with NFs

cnDBTier Automated Backup:

• Updated the cnDBTier Automated Backup to include details about automated backup metrics, alerts, and APIs.
• Added details about the http://<base-uri>/db-tier/status/cluster/local/backup API in the cnDBTier Backup APIs section.
• Added the db_tier_ndb_backup_in_progress metric in the cnDBTier Automated Backup Metrics section, which states if a data node backup is in progress in the current site.
• Added the DB_TIER_NDB_BACKUP_IN_PROGRESS alert in the cnDBTier Automated Backup Alerts section, which is triggered when a data node backup is in progress in the current site.

Automating Vertical Scaling of PVCs Using dbtscale_vertical_pvc:

• Added information about the dbtscale_vertical_pvc script in the cnDBTier Scaling section.
• Updated the following vertical scaling procedures to include the steps to scale PVCs using the dbtscale_vertical_pvc script:
  • Scaling ndbmtd Pods
  • Scaling ndbappmysqld Pods
  • Scaling ndbmysqld Pods
  • Vertical Scaling of db-replication-svc Pods
  • Scaling of ndbmgmd Pods

General Updates:

• Added the cnDBTier Scaling section to provide an overview about the horizontal and vertical scaling of cnDBTier resources.
• Metrics:
  • Added the following metrics to the monitor parallel backup transfer status in the cnDBTier Parallel Backup Transfer Progress Metrics section:
    • local_backup_transfer_progress
    • remote_backup_transfer_progress
  • Removed the "cnDBTier JVM Heap Metrics" section from the document as these metrics are no more fetched by cnDBTier.
  • Removed the "cnDBTier PVC Health Monitoring Metrics" section as these metrics are removed in this release to reduce the load on DB monitor service.
  • Added the following metrics to record the progress of NDB restore in the cnDBTier Fault Recovery State Metrics section:
    • db_tier_ndb_restore_meta_progress
    • db_tier_ndb_restore_data_progress
• Alerts:
  • Removed the "cnDBTier PVC Health Monitoring Alerts" section from the document as these alerts are removed in this release to reduce the load on DB monitor service.
  • Updated the backup size limit after which the BACKUP_SIZE_GROWTH alert is triggered from 5% to 20% in the cnDBTier Automated Backup Alerts section.
  • Added the following data node alerts, that are triggered when the NDB application node is slow, in the cnDBTier Node Data Volume Alerts:
    • DB_TIER_API_SEND_NODE_DATA_VOLUME_LOW
    • DB_TIER_API_RECEIVE_NODE_DATA_VOLUME_LOW
    • DB_TIER_SEND_DATA_NODE_DATA_VOLUME_LOW
    • DB_TIER_RECEIVE_DATA_NODE_DATA_VOLUME_LOW
    • DB_TIER_DATA_NODE_SCAN_FRAGMENT_SLOW
• Maintenance Procedures:
  • Added a note in the Maintenance Procedures section to state that cnDBTier doesn't support monitoring or alarming about certificate expiry.
  • Updated the sample outputs in the Changing Authentication Plugin on cnDBTier Sites section.
  • Added a note in the Modifying Remote Server Configurations for Secure Transfer of Backups section to inform the user that the faultrecoverybackuptransfer parameter is set to false by default.
  • Updated the steps to modify the HTTPS certificates in the Modifying HTTPS Certificates section.
  • Updated the procedures to start and stop georeplication in the following sections:
    • Starting cnDBTier Georeplication Between Sites
    • Stopping cnDBTier Georeplication Between Sites
• Updated the MySQL version from "8.4.2" to "8.4.3" in the entire document.
• Updated the timestamps in the sample outputs in the entire document.