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

4.5.6

Fixes

DR and backup restoration could stall when encountering transactions larger than 5 MB. rdar://problem/28744048
The _valid field in layer status was missing when the client couldn't communicate with the cluster. rdar://problem/27643333
Backup uploads to blobstore were not verifying their checksums. rdar://problem/28417369

Creating transactions with the multi-version client was not thread safe. rdar://problem/28546688
The status latency probe is now performed separately from other status gathering code. rdar://problem/28119480
Watches could fire early needlessly and in rare cases may not fire when they should. rdar://problem/27957628
Change the type of the query_queue_max attribute in status from an object to an integer. rdar://problem/26709846
fdbserver arguments were not properly preserved in log output. rdar://problem/28407513
Increase priority of getting read versions over commits on the master proxy.
Java: Inserting a non-Long number into a Tuple and reading it back out threw a ClassCastException. rdar://problem/28260594

Fix: key and value output did not escape the backslash ('\') character. rdar://problem/27832343
Spaces in key and value output are no longer escaped. rdar://problem/27832343

Fix: Range queries with a limit could sometimes return fewer items than requested. rdar://problem/27879470

Fix: backup and DR range_bytes_written and mutation_log_bytes_written are reset when backup or DR is restarted. rdar://problem/27640774
Added _valid and _error fields to layer status. rdar://problem/27643333

Fixed thread safety issues with backup and DR.
Fixed a load balancing problem when a machine was already failed when a client starts.
Golang: adding an explicit conflict key included the key immediately following in the conflict range.

When a process is added to a cluster, it will be given data at a much faster rate. rdar://problem/24075759
Improved the speed at which the cluster reacts to a failed process.

Calculating status in large databases could cause slow tasks. rdar://problem/25805251
Fdbrestore printed an error when passed the --help flag. rdar://problem/26126793
A multi-version API external client that was a duplicate could cause a crash at client shutdown. rdar://problem/25838039
A multi-version API external client that failed to load would cause a crash at client shutdown. rdar://problem/26611919
Status could report an incorrect database size in rare scenarios. rdar://problem/25295683
Data distribution would stop working (both exclude and new recruitment) if a call to commit on the storage server could hang indefinitely. rdar://problem/26276166
fdbcli would quit on some commands that were not errors or continue after some real errors when run with --exec. rdar://problem/25755317
Trace files generated by clients using the multi-version API could have name collisions. rdar://problem/25884486

Client issues are now aggregated by name and have an addresses list. Status details prints a truncated view of these. rdar://problem/23469072
Status json lists incompatible clients. rdar://problem/24415680
Status json includes processes that couldn't be reached in the processes list. rdar://problem/26703551
Exclude does not run if it will drop free space below 10%. This check can be bypassed by adding the word FORCE as a parameter. rdar://problem/22922266
Added write mode, which must be turned on to set or clear keys. rdar://problem/25779641
Added the kill command for killing processes.

The restart logic for dead child processes now uses a backoff. rdar://problem/26100711
Added option to remove WD40 environment variables. rdar://problem/26100669
fdbmonitor will create the lockfile directory if it doesn't exist. rdar://problem/26502883
Added support for monitoring symbolic link changes in the configuration file path. rdar://problem/26100843
Added an option to disable killing of child processes when the configuration changes. rdar://problem/26100939
Added support for larger process IDs. rdar://problem/26350469

Blobstore URLs can now contain multiple IP addresses, separated by commas, over which to load balance requests. rdar://problem/23095572

API version updated to 450. There are no behavior changes in this API version. See the :ref:API version upgrade guide <api-version-upgrade-guide-450> for upgrade details.
Add error predicate testing to client bindings. This new functionality should help complex use cases write correct transaction retry loops where dispatching on error classes is needed. rdar://problem/24492860

Maximum shard size increased from 100MB to 500MB. rdar://problem/21225031
Support backslash as an escape character for semicolons and backslashes when setting network options using environment variables. rdar://problem/23902390
Add logGroup attribute to rolled trace events. rdar://problem/25726509
Calling get range with a begin key == \xff\xff/worker_interfaces will return a list of serialized worker interfaces. Calling set with the key \xff\xff/reboot_worker and a value which is a serialized worker interface will reboot that process. rdar://problem/26101019