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Changes in 4.2.0


Secure parser

The secure parser is used to enforce permissions on incoming client IPC requests. Users are restricted to calling APIs only. String and lambda requests are forbidden for non-administrator users.

Enabled by setting DELTACONTROL_SECURE_PARSER environment variable to YES.


Async permissions

By default, permissioned instances will enforce permissions only on sync requests. An instance config variable has been added to enable this system-wide or per-instance. The boolean .pm.async.enabled flag should be set to true to enable.

Async queries will not be included in query logging by default with above flag enabled.

Password hashing

Password security has been improved by using a more secure hashing algorithm. Passwords are also secured with a randomly generated salt, which gets updated whenever the password is changed.

Control logins

The ability to open direct handles to Control has been restricted to permissioned users.

In order for non-admins to access Control, the user must have permission on the CxLogin entity group.

The restriction only exists for IDE connections or direct IPC handles to Control. Connections via the App Server are unaffected.

Process-level administrator

Ability to configure users as administrators on a per-instance basis. Users will have full access to instances where they have Read/Write permission.

Existing Read/Write permissions on instances should be reviewed on upgraded systems to ensure they are appropriate.

Web tier secure headers and CSP

Content Security Policy (CSP) implemented. Extended Secure header options to include CSP policy restricting third-party XSS and injections.

Namespace migration

The .r namespace has been migrated to .rpl to allow usage of the KX R interface.

To ensure backward compatibility, all functions can be copied back to the .r namespace by setting the DELTACONTROL_NAMESPACE_MAP environment variable to YES.

If DELTACONTROL_PERM_MAP is not set, DELTACONTROL_NAMESPACE_MAP will also control the .pm to .p mapping.

Query router

Polling query updates

Added support for supressing results if they haven’t changed from the previous attempt. This brings the behavior into line with the old managed-query functionality via the QM.

Whether to publish all results or only on change is configurable when registering a polling request. The kdb+ client interface is set up to receive all by default but can be overridden by setting the updatesOnly flag in only publish results if they differ from the previous run.

By default it is disabled in the kdb+ client but can be enabled by setting updatesOnly in the opts dictionary of .qr.client.addPollingSub to true.


Allow nested sub-requests, i.e. a sub-request triggering another sub-request. Previously this was not supported and would signal an error during the aggregation.

When sending a sub-request, the user can solution can now specify multiple targets for it. For routed requests, this allows any request routings to be overwritten if only a subset of the data is required for the sub-request result.

This will be the default behavior.

To use the original routings for the request, add routing flag to the opts parameter of .qr.sub.sendRequest.

Polling requests are now allowed to trigger sub-requests.

Multiple targets

As part of the above feature changes, the ability to target multiple processes was enabled for client requests. The kdb+ client can now specify multiple processes to target and the QR will route to those processes by default without needing to setup a routed request. This will override any routings configured for the request but the same aggregation function will still be used if one is set.

Manual failover

Ability to manually trigger a failover of the QR cluster by publishing a broadcast message with a preferred list of instances.

Triggered failover

Action tracker

Action tracker management moved to Control UI

The ability to create, update and manage Action Trackers, Queues and Transitions has been added to KX Control. See KX Stream documentation.

Delete attachments

Can now delete attachments from within an Action Tracker item.

Release management/Git integration

The Package importer and exporter now support pulling and pushing to Git repositories. More information can be found in the Release Management section and there is now a Revisions section to describe how to work with local and remove revisions and comparisons.

New code editing features

To assist in code editing for Analytics, Instructions or Process templates, new content assist capabilities have been added. Definitions for the core language and the Process Template API are now available. Hover help for functions in code will be shown. F3 to navigate to an Analytic or Schema is also now supported. See the details in the Analytic code editing section.

Distinct UI permission groups

Several permission groups have been added to assign or revoke privileges more easily for certain tasks within the Control Web UI. See the Control UI Permissions section for more information. Upon upgrade (not on a fresh install) the Control Web UI API groups that existed prior to 4.2.0 will still exist, namely CtrluiAPI and CtrluiAdminAPI. To enable non-administrator users of Control Web UI to be set up, these two API groups should be removed. This can be achieved by executing the following on KX Control



Schema details

All schemas loaded into instances from Control will be registered in the .schema namespace by default now. Previously this was only done in selected Stream templates. .schema.cols dictionary can be used to get the list of columns for each loaded schema.

Instance configuration

object use
.log.precision Ability to set \P
.log.tsPrecision Number of decimal places in stdout logging timestamp
.log.consoleSize Set the console width
.pm.async.enabled Enable async permissions

Windows log rolling

Log file rolling now supported for Control process and instances.

The rollBy option only supports process.

Remembering analytic push locations

When changes are made to an analytic and it needs to be manually pushed, the dialog now remembers the previous destinations. See the Analytics section.

Multi-select access change

The user and group list in the Entitlements tab now supports multi-select to change the access level for multiple items.


The viewer for Parameters now supports search across all parameters in the system.

Parameters Viewer

Show partial log for Control

The Tools menu now has an item to open up the log viewer against Control

Improved about dialog information

The User > About dialog now contains more information about the underlying platform, kdb+ install, license information, etc.

About Dialog

Web tier tomcat upgraded

Platform-bundled Tomcat now running latest version 9

SNMP notifications

Ability to send SNMP notifications for integration with third-party monitoring tools.

SNMP Notifications

Streaming analytics binary message support

Messages from q through to clients remain in IPC binary format for client side decoding. Increases speed and memory footprint within KX Platform

Unlock user on password reset

Configuration now available to unlock a user when password is reset.

Unlock user on reset

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