############# Release Notes #############

4.6.5

Bindings

Java bindings now perform marshaling off of the network thread. rdar://problem/32413365

Added ability to use --io_trust_seconds in a warn-only mode, which logs a trace event rather than failing the process when a disk operation takes a long time. This is enabled with --io_trust_warn_only. rdar://problem/32344389

Disk operation timeouts now cause the process to restart rather than hang indefinitely. rdar://problem/31888796
fdbdr switch did not start the DR in the opposite direction correctly, resulting in mutations being lost. rdar://problem/32598128
Lowered backup and DR batch sizes to avoid large packet warnings. rdar://problem/30933203
Remove partial pipelining of tlog commits.

Added the ability to run a consistency check of a database using a new server role. rdar://problem/30903086

Added the ability to automatically shutdown processes if a disk operation takes a long time to complete. This is enabled with --io_trust_seconds. rdar://problem/31229332
Too many outstanding storage recruitment requests causes the cluster controller to hang. rdar://problem/30271581
Corrected issue with Ubuntu installer package on Ubuntu 16.04 not starting daemon. rdar://problem/27752324
Package non-Linux builds of JNI component into Java jars. rdar://problem/30786246
Published backup-related binaries on macOS were incorrectly pointing to symbolic link specification files. rdar://problem/31403408

We no longer fsync trace files. rdar://problem/30400189
Lowered the default bandwidth shard splitting knobs for better performance with hot key ranges. rdar://problem/30234328

The tlog could commit more than 100MB at a time rdar://problem/29312187
Metrics with filename component not present in trace events rdar://problem/29933550
Setting new locality information causes missing process metrics in status details rdar://problem/29992530
FDB processes killed via CLI could hang while killing themselves rdar://problem/29518674
Enabled recovery of on-disk data files in the event of a very specific rare corruption situation rdar://problem/29679886
Process messages get reported as errors by status, but don't get attributed to a process in the status details list rdar://problem/29866630
DR prematurely reported progress for work that needed to be retried rdar://problem/29741198

Storage engine performance improvements to reduce the overhead that ssd-2 requires for its benefits over ssd-1 rdar://problem/29332661
Lowered the default fetch keys parallelism to slow down data distribution rdar://problem/29934862

Starting a new DR on a large database can cause the secondary cluster to lose availability rdar://problem/29422130
Secondary clusters that have been upgraded were reporting "primary" metrics rdar://problem/29407318
Backup and DR could get stuck if too many tasks timed out simultaneously rdar://problem/29422234

Added a new storage engine type ssd-2 that includes page checksums and more efficient storage of large values. The previous storage engine has been renamed ssd-1, and the storage engine ssd is an alias for ssd-2. rdar://problem/28565614 rdar://problem/28723720
DR and Restore won't overwrite a non empty database rdar://problem/27082102 rdar://problem/27065780

Improve performance of the ssd storage engine in databases with large keys or values rdar://problem/28701207
Improved cluster recovery speed rdar://problem/28877814
Restore is faster due to better load leveling across the keyspace rdar://problem/27554051
Reduced the conflict ranges applied for get range calls in rare cases rdar://problem/28034705

Backup to Blobstore sends and verifies MD5 sums for uploads rdar://problem/23077230
Backup restoration could be unrestorable in certain cases rdar://problem/27933144
Clients using the multi-version client functionality would incorrectly report incompatible connections in status rdar://problem/28396098
Backup and DR network metrics were incorrectly reported as 0 rdar://problem/28589577
Java: fix race condition when removing an empty directory which could lead to a NoSuchElementException rdar://problem/28858833
Fixed a source of potential crashes in fdbcli rdar://problem/27063940

API version updated to 460. There are no behavior changes in this API version. See the :ref:API version upgrade guide <api-version-upgrade-guide-460> for upgrade details.

The following fields were added: cluster.data.moving_data.total_written_bytes, cluster.qos.limiting_queue_bytes_storage_server, cluster.qos.worst_version_lag_storage_server, cluster.qos.limiting_version_lag_storage_server, cluster.qos.transaction_per_second_limit, cluster.qos.released_transactions_per_second, cluster.qos.performance_limited_by.reason_id, and cluster.database_available