YDB Server changelog

Version 24.3

Release date: December 24, 2024.

Functionality

  • Introduced query tracing, a tool that allows you to view the detailed path of a request through a distributed system.
  • Added support for asynchronous replication, that allows synchronizing data between YDB databases in near real time. It can also be used for data migration between databases with minimal downtime for applications interacting with these databases.
  • Added support for views, which can be enabled by the cluster administrator using the enable_views setting in dynamic configuration.
  • Extended federated query capabilities to support new external data sources: MySQL, Microsoft SQL Server, and Greenplum.
  • Published documentation on deploying YDB with federated query functionality (manual setup).
  • Added a new launch parameter FQ_CONNECTOR_ENDPOINT for YDB Docker containers that specifies an external data source connector address. Added support for TLS encryption for connections to the connector and the ability to expose the connector service port locally on the same host as the dynamic YDB node.
  • Added an auto-partitioning mode for topics, where partitions can dynamically split based on load while preserving message read-order and exactly-once guarantees. The mode can be enabled by the cluster administrator using the settings enable_topic_split_merge and enable_pqconfig_transactions_at_scheme_shard in dynamic configuration.
  • Added support for transactions involving topics and row-based tables, enabling transactional data transfer between tables and topics, or between topics, ensuring no data loss or duplication. Transactions can be enabled by the cluster administrator using the settings enable_topic_service_tx and enable_pqconfig_transactions_at_scheme_shard in dynamic configuration.
  • Implemented Change Data Capture (CDC) for synchronous secondary indexes.
  • Added support for changing record retention periods in CDC topics.
  • Added support for auto-increment columns as part of a table's primary key.
  • Added audit logging for user login events in YDB, session termination events in the user interface, and backup/restore operations.
  • Added a system view with information about sessions installed from the database using a query.
  • Added support literal default values for row-oriented tables. When inserting a new row in YDB Query default values will be assigned to the column if specified.
  • Added support for RETURNING clause in queries.
  • Added start/end times and authors in the metadata for backup/restore operations from S3-compatible storage.
  • Added support for backup/restore of ACL for tables from/to S3-compatible storage.
  • Included paths and decompression methods in query plans for reading from S3.
  • Added new parsing options for timestamp/datetime fields when reading data from S3.
  • Added support for the Decimal type in partitioning keys.
  • Improved diagnostics for storage issues in HealthCheck.
  • (Experimental) Added a cost-based optimizer for complex queries, involving column-oriented tables. The cost-based optimizer considers a large number of alternative execution plans for each query and selects the best one based on the cost estimate for each option. Currently, this optimizer only works with plans that contain JOIN operations.
  • (Experimental) Initial version of the workload manager was implemented. It allows to create resource pools with CPU, memory and active queries count limits. Resource classifiers were implemented to assign queries to specific resource pool.
  • (Experimental) Implemented automatic index selection for queries, which can be enabled via the index_auto_choose_mode setting in table_service_config in dynamic configuration.

YDB UI

  • Added support for creating and viewing information on asynchronous replication instances.
  • Added an indicator for auto-increment columns.
  • Added a tab with information about tablets.
  • Added a tab with details about distributed storage groups.
  • Added a setting to trace all queries and display tracing results.
  • Enhanced the PDisk page with attributes, disk space consumption details, and a button to initiate disk decommissioning.
  • Added information about currently running queries.
  • Added a row limit setting for query editor output and a notification when results exceed the limit.
  • Added a tab to display top CPU-consuming queries over the last hour.
  • Added a control to search the history and saved queries pages.
  • Added the ability to cancel query execution.
  • Added a shortcut to save queries in the editor.
  • Separated donor disks from other disks in the UI.
  • Added support for InterruptInheritance ACL and improved visualization of active ACLs.
  • Added a display of the current UI version.
  • Added a tab with information about the status of settings for enabling experimental functionality.

Performance

  • Accelerated recovery of tables with secondary indexes from backups up to 20% according to our tests.
  • Optimized Interconnect throughput.
  • Improved the performance of CDC topics with thousands of partitions.
  • Enhanced the Hive tablet balancing algorithm.

Bug fixes

  • Fixed an issue that caused databases with a large number of tables or partitions to become non-functional during restoration from a backup. Now, if database size limits are exceeded, the restoration operation will fail, but the database will remain operational.
  • Implemented a mechanism to forcibly trigger background compaction when discrepancies between the data schema and stored data are detected in DataShard. This resolves a rare issue with delays in schema changes.
  • Resolved duplication of authentication tickets, which led to an increased number of requests to authentication providers.
  • Fixed an invariant violation issue during the initial scan of CDC, leading to an abnormal termination of the ydbd server process.
  • Prohibited schema changes for backup tables.
  • Fixed an issue with an initial scan freezing during CDC when the table is frequently updated.
  • Excluded deleted indexes from the count against the maximum index limit.
  • Fixed a bug in the display of the scheduled execution time for a set of transactions (planned step).
  • Fixed a problem with interruptions in blue–green deployment in large clusters caused by frequent updates to the node list.
  • Resolved a rare issue that caused transaction order violations.
  • Fixed an issue in the EvWrite API that resulted in incorrect memory deallocation.
  • Resolved a problem with volatile transactions hanging after a restart.
  • Fixed a bug in the CDC, which in some cases leads to increased CPU consumption, up to a core per CDC partition.
  • Eliminated read delays occurring during and after the splitting of certain partitions.
  • Fixed issues when reading data from S3.
  • Corrected the calculation of the AWS signature for S3 requests.
  • Resolved false positives in the HealthCheck system during database backups involving a large number of shards.

Version 24.2

Release date: August 20, 2024.

Functionality

  • Added the ability to set maintenance task priorities in the cluster management system.
  • Added a setting to enable stable names for cluster nodes within a tenant.
  • Enabled retrieval of nested groups from the LDAP server, improved host parsing in the LDAP-configuration, and added an option to disable built-in authentication via login and password.
  • Added support for authenticating dynamic nodes using SSL-certificates.
  • Implemented the removal of inactive nodes from Hive without a restart.
  • Improved management of inflight pings during Hive restarts in large clusters.
  • Changed the order of establishing connections with nodes during Hive restarts.

YDB UI

  • Added the option to set a TTL for user sessions in the configuration file.
  • Added an option to sort the list of queries by CPUTime.
  • Fixed precision loss when working with double, float data types.
  • Added support for creating directories in the UI.
  • Added an auto-refresh control on all pages.
  • Improved ACL display.
  • Enabled autocomplete in the queries editor by default.
  • Added support for views.

Bug fixes

  • Added a check on the size of the local transaction prior to its commit to fix errors in scheme shard operations when exporting/backing up large databases.
  • Fixed an issue with duplicate results in SELECT queries when reducing quotas in DataShard.
  • Fixed errors occurring during coordinator state changes.
  • Fixed issues during the initial CDC scan.
  • Resolved race conditions in asynchronous change delivery (asynchronous indexes, CDC).
  • Fixed a crash that sometimes occurred during TTL-based deletions.
  • Fixed an issue with PDisk status display in the CMS.
  • Fixed an issue that might cause soft tablet transfers (drain) from a node to hang.
  • Resolved an issue with the interconnect proxy stopping on a node that is running without restarts. The issue occurred when adding another node to the cluster.
  • Corrected string escaping in error messages.
  • Fixed an issue with managing free memory in the interconnect.
  • Corrected UnreplicatedPhantoms and UnreplicatedNonPhantoms counters in VDisk.
  • Fixed an issue with handling empty garbage collection requests on VDisk.
  • Resolved issues with managing TVDiskControls settings through CMS.
  • Fixed an issue with failing to load the data created by newer versions of VDisk.
  • Fixed an issue with executing the REPLACE INTO queries with default values.
  • Fixed errors in queries with multiple LEFT JOINs to a single string table.
  • Fixed precision loss for float,double types when using CDC.

Version 24.1

Release date: July 31, 2024.

Functionality

  • The Knn UDF function for precise nearest vector search has been implemented.
  • The gRPC Query service has been developed, enabling the execution of all types of queries (DML, DDL) and retrieval of unlimited amounts of data.
  • Integration with the LDAP protocol has been implemented, allowing the retrieval of a list of groups from external LDAP directories.

Embedded UI

  • The database information tab now includes a resource consumption diagnostic dashboard, which allows users to assess the current consumption of key resources: processor cores, RAM, and distributed storage space.
  • Charts for monitoring the key performance indicators of the YDB cluster have been added.

Performance

  • Session timeouts for the coordination service between server and client have been optimized. Previously, the timeout was 5 seconds, which could result in a 10-second delay in identifying an unresponsive client and releasing its resources. In the new version, the check interval depends on the session's wait time, allowing for faster responses during leader changes or when acquiring distributed locks.
  • CPU consumption by SchemeShard replicas has been optimized, particularly when handling rapid updates for tables with a large number of partitions.

Bug fixes

  • A possible queue overflow error has been fixed. Change Data Capture now reserves the change queue capacity during the initial scan.
  • A potential deadlock between receiving and sending CDC records has been fixed.
  • An issue causing the loss of the mediator task queue during mediator reconnection has been fixed. This fix allows processing of the mediator task queue during resynchronization.
  • A rarely occurring error has been fixed, where with volatile transactions enabled, a successful transaction confirmation result could be returned before the transaction was fully committed. Volatile transactions remain disabled by default and are still under development.
  • A rare error that led to the loss of established locks and the successful confirmation of transactions that should have failed with a "Transaction Locks Invalidated" error has been fixed.
  • A rare error that could result in a violation of data integrity guarantees during concurrent read and write operations on a specific key has been fixed.
  • An issue causing read replicas to stop processing requests has been fixed.
  • A rare error that could cause abnormal termination of database processes if there were uncommitted transactions on a table during its renaming has been fixed.
  • An error in determining the status of a static group, where it was not marked as non-working when it should have been, has been fixed.
  • An error involving partial commits of a distributed transaction with uncommitted changes, caused by certain race conditions with restarts, has been fixed.
  • Anomalies related to reading outdated data, detected using Jepsen, have been fixed.

Version 23.4

Release date: May 14, 2024.

Performance

  • Fixed an issue of increased CPU consumption by a topic actor PERSQUEUE_PARTITION_ACTOR.
  • Optimized resource usage by SchemeBoard replicas. The greatest effect is noticeable when modifying the metadata of tables with a large number of partitions.

Bug fixes

  • Fixed a bug of possible partial commit of accumulated changes when using persistent distributed transactions. This error occurs in an extremely rare combination of events, including restarting tablets that service the table partitions involved in the transaction.
  • Fixed a bug involving a race condition between the table merge and garbage collection processes, which could result in garbage collection ending with an invariant violation error, leading to an abnormal termination of the ydbd server process.
  • Fixed a bug in Blob Storage, where information about changes to the composition of a storage group might not be received in a timely manner by individual cluster nodes. As a result, reads and writes of data stored in the affected group could become blocked in rare cases, requiring manual intervention.
  • Fixed a bug in Blob Storage, where data storage nodes might not start despite the correct configuration. The error occurred on systems with the experimental "blob depot" feature explicitly enabled (this feature is disabled by default).
  • Fixed a bug that sometimes occurred when writing to a topic with an empty producer_id with turned off deduplication. It could lead to abnormal termination of the ydbd server process.
  • Fixed a bug that caused the ydbd process to crash due to an incorrect session state when writing to a topic.
  • Fixed a bug in displaying the metric of number of partitions in a topic, where it previously displayed an incorrect value.
  • Fixed a bug causing memory leaks that appeared when copying topic data between clusters. These could cause ydbd server processes to terminate due to out-of-memory issues.

Version 23.3

Release date: October 12, 2023.

Functionality

  • Implemented visibility of own changes. With this feature enabled you can read changed values from the current transaction, which has not been committed yet. This functionality also allows multiple modifying operations in one transaction on a table with secondary indexes.
  • Added support for column tables. It is now possible to create analytical reports based on stored data in YDB with performance comparable to specialized analytical DBMS.
  • Added support for Kafka API for topics. YDB topics can now be accessed via a Kafka-compatible API designed for migrating existing applications. Support for Kafka protocol version 3.4.0 is provided.
  • Added the ability to write to a topic without deduplication. This is important in cases where message processing order is not critical.
  • YQL has added the capabilities to create, modify, and delete topics.
  • Added support of assigning and revoking access rights using the YQL GRANT and REVOKE commands.
  • Added support of DML-operations logging in the audit log.
  • (Experimental) When writing messages to a topic, it is now possible to pass metadata. To enable this functionality, add enable_topic_message_meta: true to the configuration file.
  • (Experimental) Added support for reading from topics in a transaction. It is now possible to read from topics and write to tables within a transaction, simplifying the data transfer scenario from a topic to a table. To enable this functionality, add enable_topic_service_tx: true to the configuration file.
  • (Experimental) Added support for PostgreSQL compatibility. This involves executing SQL queries in PostgreSQL dialect on the YDB infrastructure using the PostgreSQL network protocol. With this capability, familiar PostgreSQL tools such as psql and drivers (e.g., pq for Golang and psycopg2 for Python) can be used. Queries can be developed using the familiar PostgreSQL syntax and take advantage of YDB's benefits such as horizontal scalability and fault tolerance.
  • (Experimental) Added support for federated queries. This enables retrieving information from various data sources without the need to move the data into YDB. Federated queries support interaction with ClickHouse and PostgreSQL databases, as well as S3 class data stores (Object Storage). YQL queries can be used to access these databases without duplicating data between systems.

Embedded UI

  • A new option PostgreSQL has been added to the query type selector settings, which is available when the Enable additional query modes parameter is enabled. Also, the query history now takes into account the syntax used when executing the query.
  • The YQL query template for creating a table has been updated. Added a description of the available parameters.
  • Now sorting and filtering for Storage and Nodes tables takes place on the server. To use this functionality, you need to enable the parameter Offload tables filters and sorting to backend in the experiments section.
  • Buttons for creating, changing and deleting topics have been added to the context menu.
  • Added sorting by criticality for all issues in the tree in Healthcheck.

Performance

  • Implemented read iterators. This feature allows to separate reads and computations. Read iterators allow datashards to increase read queries throughput.
  • The performance of writing to YDB topics has been optimized.
  • Improved tablet balancing during node overload.

Bug fixes

  • Fixed an error regarding potential blocking of reading iterators of snapshots, of which the coordinators were unaware.
  • Memory leak when closing the connection in Kafka proxy has been fixed.
  • Fixed an issue where snapshots taken through reading iterators may fail to recover on restarts.
  • Fixed an issue with an incorrect residual predicate for the IS NULL condition on a column.
  • Fixed an occurring verification error: VERIFY failed: SendResult(): requirement ChunksLimiter.Take(sendBytes) failed.
  • Fixed ALTER TABLE for TTL on column-based tables.
  • Implemented a FeatureFlag that allows enabling/disabling work with CS and DS.
  • Fixed a 50ms time difference between coordinator time in 23-2 and 23-3.
  • Fixed an error where the storage endpoint was returning extra groups when the viewer backend had the node_id parameter in the request.
  • Added a usage filter to the /storage endpoint in the viewer backend.
  • Fixed an issue in Storage v2 where an incorrect number was returned in the Degraded field.
  • Fixed an issue with cancelling subscriptions from sessions during tablet restarts.
  • Fixed an error where healthcheck alerts for storage were flickering during rolling restarts when going through a load balancer.
  • Updated CPU usage metrics in YDB.
  • Fixed an issue where NULL was being ignored when specifying NOT NULL in the table schema.
  • Implemented logging of DDL operations in the common log.
  • Implemented restriction for the YDB table attribute add/drop command to only work with tables and not with any other objects.
  • Disabled CloseOnIdle for interconnect.
  • Fixed the doubling of read speed in the UI.
  • Fixed an issue where data could be lost on block-4-2.
  • Added a check for topic name validity.
  • Fixed a possible deadlock in the actor system.
  • Fixed the KqpScanArrowInChanels::AllTypesColumns test.
  • Fixed the KqpScan::SqlInParameter test.
  • Fixed parallelism issues for OLAP queries.
  • Fixed the insertion of ClickBench parquet files.
  • Added a missing call to CheckChangesQueueOverflow in the general CheckDataTxReject.
  • Fixed an error that returned an empty status in ReadRows API calls.
  • Fixed incorrect retry behavior in the final stage of export.
  • Fixed an issue with infinite quota for the number of records in a CDC topic.
  • Fixed the import error of string and parquet columns into an OLAP string column.
  • Fixed a crash in KqpOlapTypes.Timestamp under tsan.
  • Fixed a viewer backend crash when attempting to execute a query against the database due to version incompatibility.
  • Fixed an error where the viewer did not return a response from the healthcheck due to a timeout.
  • Fixed an error where incorrect ExpectedSerial values could be saved in Pdisks.
  • Fixed an error where database nodes were crashing due to segfault in the S3 actor.
  • Fixed a race condition in ThreadSanitizer: data race KqpService::ToDictCache-UseCache.
  • Fixed a race condition in GetNextReadId.
  • Fixed an issue with an inflated result in SELECT COUNT(*) immediately after import.
  • Fixed an error where TEvScan could return an empty dataset in the case of shard splitting.
  • Added a separate issue/error code in case of available space exhaustion.
  • Fixed a GRPC_LIBRARY Assertion failed error.
  • Fixed an error where scanning queries on secondary indexes returned an empty result.
  • Fixed validation of CommitOffset in TopicAPI.
  • Reduced shared cache consumption when approaching OOM.
  • Merged scheduler logic from data executer and scan executer into one class.
  • Added discovery and proxy handlers to the query execution process in the viewer backend.
  • Fixed an error where the /cluster endpoint returned the root domain name, such as /ru, in the viewer backend.
  • Implemented a seamless table update scheme for QueryService.
  • Fixed an issue where DELETE returned data and did not delete it.
  • Fixed an error in DELETE ON operation in query service.
  • Fixed an unexpected batching disablement in default schema settings.
  • Fixed a triggering check VERIFY failed: MoveUserTable(): requirement move.ReMapIndexesSize() == newTableInfo->Indexes.size().
  • Increased the default timeout for grpc-streaming.
  • Excluded unused messages and methods from QueryService.
  • Added sorting by Rack in /nodes in the viewer backend.
  • Fixed an error where sorting queries returned an error in descending order.
  • Improved interaction between KQP and NodeWhiteboard.
  • Removed support for old parameter formats.
  • Fixed an error where DefineBox was not being applied to disks with a static group.
  • Fixed a SIGSEGV error in the dinnode during CSV import via YDB CLI.
  • Fixed an error that caused a crash when processing NGRpcService::TRefreshTokenImpl.
  • Implemented a gossip protocol for exchanging cluster resource information.
  • Fixed an error in DeserializeValuePickleV1(): requirement data.GetTransportVersion() == (ui32) NDqProto::DATA_TRANSPORT_UV_PICKLE_1_0 failed.
  • Implemented auto-increment columns.
  • Use UNAVAILABLE status instead of GENERIC_ERROR when shard identification fails.
  • Added support for rope payload in TEvVGet.
  • Added ignoring of deprecated events.
  • Fixed a crash of write sessions on an invalid topic name.
  • Fixed an error in CheckExpected(): requirement newConstr failed, message: Rewrite error, missing Distinct((id)) constraint in node FlatMap.
  • Enabled self-heal by default.

Version 23.2

Release date: August 14, 2023.

Functionality

  • (Experimental) Implemented visibility of own changes. With this feature enabled you can read changed values from the current transaction, which has not been committed yet. This functionality also allows multiple modifying operations in one transaction on a table with secondary indexes. To enable this feature add enable_kqp_immediate_effects: true under table_service_config section into configuration file.
  • (Experimental) Implemented read iterators. This feature allows to separate reads and computations. Read iterators allow datashards to increase read queries throughput. To enable this feature add enable_kqp_data_query_source_read: true under table_service_config section into configuration file.

Embedded UI

  • Navigation improvements:
    • Diagnostics and Development mode switches are moved to the left panel.
    • Every page has breadcrumbs.
    • Storage groups and nodes info are moved from left buttons to tabs on the database page.
  • Query history and saved queries are moved to tabs over the text editor area in query editor.
  • Info tab for scheme objects displays parameters using terms from CREATE or ALTER statements.
  • Added column tables support.

Performance

  • For scan queries, you can now effectively search for individual rows using a primary key or secondary indexes. This can bring you a substantial performance gain in many cases. Similarly to regular queries, you need to explicitly specify its name in the query text using the VIEW keyword to use a secondary index.

  • (Experimental) Added an option to give control of the system tablets of the database (SchemeShard, Coordinators, Mediators, SysViewProcessor) to its own Hive instead of the root Hive, and do so immediately upon creating a new database. Without this flag, the system tablets of the new database are created in the root Hive, which can negatively impact its load. Enabling this flag makes databases completely isolated in terms of load, that may be particularly relevant for installations, consisting from a roughly hundred or more databases. To enable this feature add alter_database_create_hive_first: true under feature_flags section into configuration file.

Bug fixes

  • Fixed a bug in the autoconfiguration of the actor system, resulting in all the load being placed on the system pool.
  • Fixed a bug that caused full scanning when searching by prefix of the primary key using LIKE.
  • Fixed bugs when interacting with datashard followers.
  • Fixed bugs when working with memory in column tables.
  • Fixed a bug in processing conditions for immediate transactions.
  • Fixed a bug in the operation of iterator-based reads on datasharrd followers.
  • Fixed a bug that caused cascading reinstallation of data delivery sessions to asynchronous indexes.
  • Fixed bugs in the optimizer for scanning queries.
  • Fixed a bug in the incorrect calculation of storage consumption by Hive after expanding the database.
  • Fixed a bug that caused operations to hang on non-existent iterators.
  • Fixed bugs when reading a range on a NOT NULL column.
  • Fixed a bug in the replication of VDisks.
  • Fixed a bug in the work of the run_interval option in TTL.

Version 23.1

Release date: May 5, 2023. To update to version 23.1, select the Downloads section.

Functionality

  • Added initial table scan when creating a CDC changefeed. Now, you can export all the data existing at the time of changefeed creation.
  • Added atomic index replacement. Now, you can atomically replace one pre-defined index with another. This operation is absolutely transparent for your application. Indexes are replaced seamlessly, with no downtime.
  • Added the audit log: Event stream including data about all the operations on YDB objects.

Performance

  • Improved formats of data exchanged between query stages. As a result, we accelerated SELECTs by 10% on parameterized queries and by up to 30% on write operations.
  • Added autoconfiguring for the actor system pools based on the workload against them. This improves performance through more effective CPU sharing.
  • Optimized the predicate logic: Processing of parameterized OR or IN constraints is automatically delegated to DataShard.
  • (Experimental) For scan queries, you can now effectively search for individual rows using a primary key or secondary indexes. This can bring you a substantial gain in performance in many cases. Similarly to regular queries, to use a secondary index, you need to explicitly specify its name in the query text using the VIEW keyword.
  • The query's computational graph is now cached at query runtime, reducing the CPU resources needed to build the graph.

Bug fixes

  • Fixed bugs in the distributed data warehouse implementation. We strongly recommend all our users to upgrade to the latest version.
  • Fixed the error that occurred on building an index on NOT NULL columns.
  • Fixed statistics calculation with MVCC enabled.
  • Fixed errors with backups.
  • Fixed the race condition that occurred at splitting and deleting a table with SDC.

Version 22.5

Release date: March 7, 2023. To update to version 22.5, select the Downloads section.

What's new

Bug fixes and improvements

  • Fixed an error inserting 0 rows with a BulkUpsert.
  • Fixed an error importing Date/DateTime columns from CSV.
  • Fixed an error importing CSV data with line breaks.
  • Fixed an error importing CSV data with NULL values.
  • Improved Query Processing performance (by replacing WorkerActor with SessionActor).
  • DataShard compaction now starts immediately after a split or merge.

Version 22.4

Release date: October 12, 2022. To update to version 22.4, select the Downloads section.

What's new

  • YDB Topics and Change Data Capture (CDC):

    • Introduced the new Topic API. YDB Topic is an entity for storing unstructured messages and delivering them to various subscribers.
    • Added support for the Topic API to the YDB CLI and SDK. The Topic API provides methods for message streaming writes and reads as well as topic management.
    • Added the ability to capture table updates and send change messages to a topic.

  • SDK:

    • Added the ability to handle topics in the YDB SDK.
    • Added official support for the database/sql driver for working with YDB in Golang.

  • Embedded UI:

    • The CDC changefeed and the secondary indexes are now displayed in the database schema hierarchy as separate objects.
    • Improved the visualization of query explain plan graphics.
    • Problem storage groups have more visibility now.
    • Various improvements based on UX research.

  • Query Processing:

    • Added Query Processor 2.0, a new subsystem to execute OLTP queries with significant improvements compared to the previous version.
    • Improved write performance by up to 60%, and by up to 10% for reads.
    • Added the ability to include a NOT NULL restriction for YDB primary keys when creating tables.
    • Added support for renaming a secondary index online without shutting the service down.
    • Improved the query explain view that now also includes fields for the physical operators.

  • Core:

    • For read only transactions, added consistent snapshot support that does not conflict with write transactions.
    • Added BulkUpsert support for tables with asynchronous secondary indexes.
    • Added TTL support for tables with asynchronous secondary indexes.
    • Added compression support for data export to S3.
    • Added an audit log for DDL statements.
    • Added support for authentication with static credentials.
    • Added system tables for query performance troubleshooting.
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