Server

• [Backups] fixed issue with deleting multiple blobs on Azure when retention policy is executed
• [Backups] fixed issue with executing retention policy on Azure when remote folder name is empty
• [Backups] fixed the ability to test credentials on server-wide backups
• [Cluster] fixed issue with excessive topology updates from the Client API
• [Cluster] do not move loading idle database to rehab
• [Compression] fixed issue with compressed flag not being added when number of overflow pages is exactly the same after compression
• [Debug] fixed issue with retrieving thread names in Threads View for some of the threads
• [Encryption] fixed 'unable to decrypt page' error
• [Encryption] fixed recovery process on encrypted storage which could cause data corruption
• [Graph API] do not return duplicate edges for Graph Visualizer
• [Indexes] memory optimizations in Lucene
• [Indexes] fixed race condition between removing or replacing an index and starting or stopping all of the indexes
• [Indexes] changing additional sources should affect index etag which is used to calculate query results caching etag
• [Indexes] expected exceptions should not generate an index error
• [Indexes] decreased the cost of retrieving the data from index stats endpoint
• [Indexes] fixed issue with disposing cached field items immediately - some of the readers could be already in use
• [Monitoring] exposed SWAP usage on Windows in SNMP
• [Monitoring] added managed memory, unmanaged memory, encryption buffers memory in use and encryption buffers memory in pool to SNMP
• [Patching] fixed issue with delete script not deleting all of the documents in some cases
• [Patching] fixed memory leak when patching a large collection on a compressed database
• [Replication] fixed NRE that could happen if there are 2 tombstones with identical ID but different collection
• [Replication] fixed NRE that could happen if we are deleting the database
• [Replication] properly clone replication items to avoid using memory not owned by the replication process which could result in AccessViolationException
• [Revisions] fixed issue with creating a revision when only Resolved flag was present in deleted document
• [Revisions] properly set flags during putting deleted revision from a cluster transaction
• [Subscriptions] fixed NRE in subscriptions when including counters that do not exist in the document
• [.NET Core] updated to 3.1.12

Client API

• [Operations] added 'GetRevisionsOperation'
• [Querying] wrap next binary expression after negation in sub clauses
• [Session] fixed issue with lazily load documents not using aggressive cache properly
• [Subscriptions] fixed ObjectDisposedException that could occur when disposing subscription worker multiple times
• [Subscriptions] fixed JavaScript translation for Id property and Load, allow to use member init
• [Subscriptions] do not redirect to node with failures

Server

• [Encryption] Fixing the recovery process on storage startup which could cause overwrite of valid data and result in "Unable to decrypt page" error
• [Encryption] Fixing potential segmentation fault error on Linux on attempt to encrypt empty page that effectively was not in use
• [Indexing] Fixing internals in Lucene to prevent from killing the server by an unhandled exception

Server

• [Alerts] Using standard deviation for Low swap size warning
• [Backups] Fixing ocasionally happening problem that backups were not triggered
• [Backups] Fixing error handling for backups to S3
• [Backups] Added Backup.TempPath configuration option
• [Cloud]Retry CPU credits sync on startup
• [Cluster] Prevent concurrent bootstrap
• [Cluster] Cluster observer will move node to rehab upon large gap from the other nodes
• [Cluster] Fixing missing revisions from cluster transactions
• [Cluster] Limiting cluster log truncation by time
• [Cluster] Promote from rehab with indexes that were explicitly disabled
• [Cluster] Stay in rehab with index error
• [Configuration] Adding Indexing.MaximumSizePerSegmentInMb, Indexing.MergeFactor, Indexing.LargeSegmentSizeToMergeInMb, Indexing.NumberOfLargeSegmentsToMergeInSingleBatch, Indexing.MaxTimeForMergesToKeepRunningInSec
• [Debug] Adding /admin/stats end point to Debug Package
• [Docker] Updating docker base image
• [Encryption] Introducing global stack to EncryptionBuffersPool for better memory management
• [ETL] Fixing IndexOutOfRangeException while iterating the ETL processes what could result in process crash
• [Indexing] Fixing partitioning in Bloom Filters
• [Indexing] Fixing JS map-reduce indexes when grouping by nested object
• [Indexing] Adding support for complex reduce keys in JS map-reduce indexes
• [Indexing] Fixing the index replacement behavior if any error happened meanwhile
• [Indexing] Improving memory management in Lucene to reduce GC cost
• [Indexing] De-referencing index resources under low memory
• [Indexing] Better management of Lucene's merges to reduce the size of transaction
• [Indexing] Fixing CreateField returning a single result when passing the same field name
• [Indexing] Fixing progress calculation of indexes processing counter or time series
• [Indexing] Improve the performance of LoadDocument when referencing very large number of documents
• [Indexing] Improve the performance of initial index run
• [Indexing] Adding support for return block statements in group by + allow arrow functions which return objects (w/o explicit return) in JS indexes map
• [Indexing] Restricting number of items in fields cache of LuceneDocumentConverter
• [Indexing] Increasing default value of Indexing.Encrypted.TransactionSizeLimitInMb configuration option to 96 MB
• [Linux] Fixing SWAP detection on HDD over SSD in Posix systems when NVMe SSD drives are available
• [Patching] Fixing regression issue with pathing large number of documents
• [Querying] Fixing metadata projection returning LastModified in incorrect format
• [Querying] Allow to include on the output of facets
• [Querying] Converting >= and <= queries to between queries automatically
• [Querying] Fixing potential issues with float comparison
• [Replication] Avoiding the update of sibling etag on new connections
• [Replication] Fixing the issue with change vector is not updated after replication
• [Replication] Fixing issue that resolving document conflict in Studio removed the attachment
• [Replication] Fixing issue with missing attachment breaking the replication
• [Replication] Fixing duplicate attachments problem in conflicted documents
• [Replication] Checking conflict status for attachment and deleted attachment which caused infinite loop
• [Replication/Smuggler]Adding unused database Ids to import/export for preventing "conflict" in import destination cluster replication
• [Revisions] Fixing issue that deleting a document with Resolved flag created a revision
• [Revisions] Fixing unhandled cases of conflicts in revisions
• [Subscriptions] Fixing the subscription behavior on SubscriptionDoesNotBelongToNodeException
• [Subscriptions] Fixing calculation of redirect node in case of failover
• [Time Series] Fixing optimistic concurrency violation error when patching multiple types
• [Time Series] Fixing parsing issue when querying with the usage of time series names containing spaces
• [Voron] Fixing the validation of overflow pages during the storage recovery process on startup
• [Voron] Fixing possible AccessViolationException in when deleting entries from fixed size trees
• [Voron] Fixing NRE on attempt to get temp page from DecompressionBuffersPool
• [Voron] Deleting large journals instead of adding them to recycle pool to speed up the startup time
• [Voron] Adding cleanup of Temp directory on storage startup
• [Voron] Fixing seeking to a record when using startAfter parameter
• [.NET Core] Updated to .NET Core 3.1.11
• Improved error handling in timer threads

Client API

• [Conventions]added DisableTopologyCache convention
• [Changes API] Fixing changes API interal operation so it should use the same node as the operation
• [Changes API] Marking Changes API connection state as faulted if failed to initialize
• [Operations] Fixing WaitForCompletion throwing InvalidOperationException for RevertRevisionsOperation
• [Querying] Adding option to project the last modified date from queries
• [Querying] Fixing calculation the hash of complex objects when querying that caused query hangs
• [Querying] Support TimeSpan in projections
• [Querying] Making HashCalculator use DateTime.GetDefaultRavenFormat
• [Querying] Fixing time series queries using the string interpolation of call expression in GroupBy
• [Serialization] Optimize client side JSON serialization
• Fixing backward compatibility of the health check endpoint
• Fixing issue when using lazy query + aggressive caching returned Index does not exists exception
• Better exception for actions that require database but none was specified via parameter or there is no default one
• Properly detecting changes in HasChanged when we have deletes
• Suggest X509KeyStorageFlags.MachineKeySet when passing invalid certificate to document store

Studio

• Adding navigation when clicking the backup alert
• Fixing hight CPU usage on the dashboard
• Auto-reconnect to web socket in Admin Logs & Traffic Watch
• When node is passive and license is not activated, stating so explicitly on the License View
• Giving better error message if trying to run update in query window
• Adding more details from Lucene do Idexing Performance view
• Fixing issue that setting value to zero in Database Record saved it as null
• Fixing broken failed Enforce Revision Configuration message

Server

• [Encryption] fixed possible AVE when encryption is being used

Server

• [Compression] fixed possible data corruption that could manifest when compression is used
• [Encryption] fixed memory leak that occurred when encryption was used
• [Querying] increased performance and decreased memory usage of collection queries with where clauses for operations (e.g. patching by collection or deleting by collection)

Client API

• [Querying] fixed NRE that could occur during streaming of query results