:original_name: dcs-ug-0326026.html .. _dcs-ug-0326026: Change History ============== +-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Released On | What's New | +===================================+===================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================+ | 2022-10-19 | Added the following FAQs: | | | | | | :ref:`Why Does a Key Disappear in Redis? ` | | | | | | :ref:`Will Cached Data Be Retained After an Instance Is Restarted? ` | | | | | | :ref:`How Do I View Current Concurrent Connections and Maximum Connections of a DCS Redis Instance? ` | | | | | | :ref:`Why Is the Rejected Connections Metric Displayed? ` | | | | | | :ref:`Why Is Flow Control Triggered? How Do I Handle It? ` | | | | | | :ref:`Analysis of Big Keys and Hot Keys ` | +-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | 2022-08-29 | Modified the following content: | | | | | | Added description about security groups and whitelist configuration in sections :ref:`Creating a DCS Redis Instance `, :ref:`Security Group Configurations `, :ref:`What Should I Do If an Error Is Returned When I Use the Jedis Connection Pool? `, :ref:`How Do I Troubleshoot Redis Connection Failures? `, and :ref:`Why Aren't Security Groups Configured for DCS Redis 4.0 and 5.0 Instances? ` | +-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | 2022-08-09 | Modified the following content: | | | | | | - Added the 512 GB specifications of DCS Redis 3.0 instances in sections :ref:`Proxy Cluster Redis ` and :ref:`Redis 3.0 Instance Specifications `. | | | - Added the impact of specification modification on some instances, in section :ref:`Modifying DCS Instance Specifications `. | | | - Optimized description about modifying configurations in sections :ref:`Viewing Details of a DCS Instance `, :ref:`Restarting DCS Instances `, :ref:`Modifying Configuration Parameters `, :ref:`Viewing Redis Slow Logs `, :ref:`Manually Backing Up a DCS Instance `, and :ref:`Configuring Alarm Rules for Critical Metrics `. | | | - Added section :ref:`Managing IP Address Whitelist `. | +-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | 2022-07-13 | Modified the following content: | | | | | | Added description about system resources and modified the procedure for enabling auto backup in section :ref:`Creating a DCS Redis Instance `. | +-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | 2022-04-11 | Modified the following content: | | | | | | Added description about accessing an instance in different languages. For details, see :ref:`Accessing an Instance `. | | | | | | Added section :ref:`Managing Shards and Replicas `. | +-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | 2021-06-30 | Modified the following content: | | | | | | - Optimized the procedure for creating an OBS bucket in section :ref:`Importing Backup Files from an OBS Bucket `. | | | - Updated the commands supported and disabled by Web CLI in section :ref:`Web CLI Commands `. | | | - Added the following FAQs: | | | | | | - :ref:`Why Aren't Security Groups Configured for DCS Redis 4.0 and 5.0 Instances? ` | | | - :ref:`Can I Obtain the Addresses of the Nodes in a Cluster DCS Redis Instance? ` | | | - :ref:`Does DCS for Redis Provide Backend Management Software? ` | | | - :ref:`Why Is "Error in execution" Returned When I Access Redis? ` | | | - :ref:`Monitoring and Alarm ` | | | - :ref:`Online Migration with Rump ` | +-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | 2020-11-20 | Modified the following content: | | | | | | - Modified the description and specifications of DCS for Redis 3.0 in section :ref:`What Is DCS? ` | | | - Modified the commands disabled in Proxy Cluster instances in section :ref:`Redis 3.0 Instance Specifications `. | +-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | 2021-07-13 | Modified the following content: | | | | | | Added detailed description about permissions management in sections :ref:`Permissions Management ` and :ref:`Permissions Management `. | +-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | 2020-10-13 | Modified the following content: | | | | | | - Added support for renaming critical commands of DCS Redis 4.0 and 5.0 instances. For details, see :ref:`Command Renaming `. | | | - Added the cache analysis function. For details, see :ref:`Cache Analysis `. | | | - Added the slow log function. For details, see :ref:`Viewing Redis Slow Logs `. | | | - Added the run log function. For details, see :ref:`Viewing Redis Run Logs `. | | | - Added cluster instance metrics in section :ref:`DCS Metrics `. | +-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | 2020-09-30 | Modified the following content: | | | | | | - Added description about DCS Redis 4.0 and 5.0 instances in section :ref:`What Is DCS? ` | | | - Added typical application scenarios in section :ref:`Application Scenarios `. | | | - Added section :ref:`DCS Instance Types ` to describe the architectures of single-node, master/standby, Proxy Cluster, and Redis Cluster instances. | | | - Added section :ref:`HA and DR Policies ` to describe the disaster recovery strategies of DCS. | | | - Added description about the specifications of DCS Redis 4.0 and 5.0 instances, QPS of DCS Redis 3.0 instances, and 1024 GB Proxy Cluster DCS Redis 3.0 instances in section :ref:`DCS Instance Specifications `. | | | - Added section :ref:`Comparing DCS and Open-Source Cache Services `. | | | - Added section :ref:`Comparing Redis Versions ` to compare DCS for Redis 3.0, 4.0, and 5.0. | | | - Added description about command compatibility of DCS Redis 4.0 and 5.0 instances in section :ref:`Command Compatibility `. | | | - Added section :ref:`Basic Concepts ` to describe the basic concepts of DCS. | | | - Added the description about OBS in section :ref:`Related Services `. | | | - Added section :ref:`Identifying Requirements `. | | | - Modified description about the process for creating instances and added description about creating DCS Redis 4.0 and 5.0 instances in section :ref:`Creating a DCS Redis Instance `. | | | - Added the description about the sold-out tip for the AZ parameter in section :ref:`Creating a DCS Redis Instance `. | | | - Modified descriptions in sections :ref:`Accessing a DCS Redis Instance Through redis-cli ` and :ref:`Jedis `. | | | - Added section :ref:`Accessing a DCS Redis 4.0 or 5.0 Instance on the Console `. | | | - Added description about DCS Redis 4.0 and 5.0 instances in section :ref:`Viewing Details of a DCS Instance `. | | | - Optimized the classification of operations in chapter :ref:`Operation Guide `. | | | - Added notes on changing the DCS instance specifications in section :ref:`Modifying DCS Instance Specifications `. | | | - Added section :ref:`Performing a Master/Standby Switchover for a DCS Instance `. | | | - Added section :ref:`Clearing DCS Instance Data ` to describe how to clear data of DCS Redis 4.0 and 5.0 instances. | | | - Added section :ref:`Exporting DCS Instance List `. | | | - Added section :ref:`Viewing Data Storage Statistics of a DCS Redis 3.0 Proxy Cluster Instance `. | | | - Added section :ref:`Downloading a Backup File `. | | | - Added section :ref:`Migrating Data with DCS `. | | | - Added section :ref:`DCS Instance Passwords ` to describe the password used for connecting to DCS instances. | | | - Added metrics of DCS Redis 4.0 and 5.0 instances in section :ref:`DCS Metrics `. | | | - Added section :ref:`Auditing ` to describe the DCS operations that can be recorded by CTS. | | | - Modified the structure of FAQs and added new FAQs in chapter :ref:`FAQs `. | +-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | 2020-07-17 | Modified the following content: | | | | | | - Added a note in section :ref:`Accessing a DCS Redis Instance Through redis-cli ` to advise against hard-coding plaintext passwords in the code. | | | - Added an explanation of the **SYS.DCS** namespace and optimized the table layout in section :ref:`DCS Metrics `. | | | - Updated the picture that demonstrates viewing instance metrics in section :ref:`Configuring Alarm Rules for Critical Metrics `. | | | - Optimized the description about CIDR blocks for cross-VPC access and added the table caption in FAQ :ref:`Does DCS Support Cross-VPC Access? ` | +-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | 2020-05-30 | Modified the following content: | | | | | | - Changed the cluster instance type to Proxy Cluster in section :ref:`What Is DCS? ` | | | - Removed description about creating multiple instances in batches and modified password complexity requirements in section :ref:`Creating a DCS Redis Instance `. | | | - Removed the instance topology parameter in section :ref:`Viewing Details of a DCS Instance `. | | | - Changed the default value of the **reserved-memory-percent** parameter to **0** and added a note clarifying that the configuration parameters supported by single-node and master/standby instances are different in section :ref:`Modifying Configuration Parameters `. | | | - Modified the special characters that the passwords cannot contain in section :ref:`Changing Instance Passwords `. | | | - Removed the section which describes the function of viewing data storage statics of a Proxy Cluster instance. | | | - Added a note clarifying that the backup policy function is not supported by single-node instances in section :ref:`Configuring a Backup Policy `. | | | - Removed Redis Server and Proxy metrics from section :ref:`Monitoring `. | +-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | 2020-03-25 | Modified the following content: | | | | | | - Changed the cluster instance type to Proxy Cluster in section :ref:`What Is DCS? ` | | | - Modified the lists of supported and disabled Redis commands in section :ref:`Command Compatibility `. | | | - Added the assured/maximum bandwidth parameter in section :ref:`DCS Instance Specifications `. | | | - Moved the metrics originally described in section :ref:`Related Services ` to section :ref:`DCS Metrics ` and updated the metrics supported by Cloud Eye. | | | - Modified instance creation parameters in :ref:`Creating a DCS Redis Instance ` according to DCS console upgrade and parameter modifications. | | | - Modified instance details parameters in section :ref:`Viewing Details of a DCS Instance ` according to DCS console upgrade and parameter modifications. | | | - Modified instance configuration parameters in section :ref:`Modifying Configuration Parameters `. | | | - Removed the function of stopping instances. | | | - Added description about restrictions of starting instances in section :ref:`Starting DCS Instances `. | | | - Changed parameter **Time Window** to **Maintenance** in section :ref:`Modifying Maintenance Time Window `. | | | - Modified description about configuring instance backup policies in section :ref:`Configuring a Backup Policy `. | | | - Added chapter :ref:`Monitoring `, updated metrics supported by Cloud Eye, and added description about operations of viewing monitoring data and setting alarm rules. | | | - Changed the supported number of DBs for single-node and master/standby instances in section :ref:`Does DCS for Redis Support Multiple Databases? ` | +-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | 2019-04-12 | Accepted in OTC-4.0/Agile-04.2019. | +-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | 2019-03-30 | Modified the following content: | | | | | | - Removed support for creating DCS instances with the specification of 1 GB in sections :ref:`DCS Instance Specifications ` and :ref:`Creating a DCS Redis Instance `. | +-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | 2018-09-05 | Modified the following content: | | | | | | - Opened certain Redis cluster commands. For details about compatibility with DCS commands, see :ref:`Command Compatibility `. | +-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | 2018-03-16 | Added the following content: | | | | | | - Added the procedure for using a Redis Java (Jedis) client to access a DCS instance. For details, see :ref:`Accessing a DCS Redis Instance Through redis-cli `. | | | - Added descriptions about the Redis-specific parameter **notify-keyspace-events**, and deleted descriptions about the Redis-specific parameter **maxclients**. For details, see :ref:`Modifying Configuration Parameters `. | | | - Added the procedures for modifying the time window and security group of a DCS instance. For details, see :ref:`Modifying Maintenance Time Window ` and :ref:`Modifying the Security Group `. | | | - Added :ref:`Does DCS Support Cross-VPC Access? ` in chapter :ref:`FAQs `. | | | | | | Modified the following content: | | | | | | - Changed instance password complexity rules. | +-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | 2017-11-08 | Added the following content: | | | | | | - Provided support for DCS instances in cluster mode. | | | - Added sections :ref:`Modifying DCS Instance Specifications ` and :ref:`Backing Up and Restoring DCS Instances `. | | | - Added the **Time Window** parameter. | | | - Added section :ref:`Preparing the Environment `. | | | | | | - Added some FAQs in chapter :ref:`FAQs `. | +-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | 2017-05-30 | Added the following content: | | | | | | - Added descriptions about batch deletion of DCS instances. | | | - Added descriptions about the Redis-specific parameter **latency-monitor-threshold**. | +-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | 2017-04-28 | Added the following content: | | | | | | - Added descriptions of DCS metrics monitored by Cloud Eye. | +-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | 2017-04-05 | This issue is the first official release. | +-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+