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Known issues

Kx Developer listens on all network interfaces (using \p)

By default, Developer uses \p port to set the process port if not already set. If only listening on localhost is desired, either:

  • set the port before loading Developer (\p localhost:port),
  • set the environment variable DEVELOPER_PORT="localhost:port", or
  • update the Developer config at <install>/config/config.{profile,bat} setting DEVELOPER_PORT="localhost:port"

Stdout/err redirection for large messages can block process

Large stdout/err messages can fill the redirection buffer causing the process to block. Signaling SIGINT on the process will cause it to resume. The size of the buffer depends on the operating system in use. In *nix and macOS, this corresponds to the maximum pipe size, and is variable on Windows.

To disable stdout/err redirection you may define the environment variable DEVELOPER_NOUSE_REDIR=true

Error 'snd. OS reports: Resource temporarily unavailable serving Developer

Prior to V3.5/3.6 2018.10.03, starting kdb+ with TLS enabled to serve content over HTTPS could result in a 'snd error. This is fixed in V3.5 and 3.6 as of that date, and is not an issue when not using TLS.

-U user/password file checks unsupported

Developer will use under the hood to perform authentication over HTTP and WebSockets. -U is ignored by this handler, for this reason -U password file checks are unsupported.

Multiple concurrent users

Developer is currently designed for a single user at a time. Multiple users can attach to the same q process as long as they can authenticate against it. Messages (stdout, stderr, and scripted visuals) are broadcast to all Developer sessions.

Suspended q processes

If a q process is in suspended mode, i.e., within the q debugger with a prompt like q)), then all requests to the process are suspended until execution resumes as normal. This means that use of Developer will also be suspended while in this mode.

Background processes with basic auth

Developer authentication requires user to input a username and password. If authentication is desired when starting q as a background process, write custom authentication handling so that username and password can be configured however desired, and load launcher.q_ as usual, with DEVELOPER_USE_AUTH="no". See the Developer for more information on usage of .z.*.


Currently Developer requires the following namespaces for regular operation:

.ax           .axbits      .axdc      .axexport  .aximport  .axparser    .axq
.axsavestubs  .bct         .child     .core      .cov       .datatype    .ds
.edi          .export      .ext       .fb        .flow      .gg          .im
.localize     .localrepo   .mock      .nvqc      .pc        .pcre        .pcre2
.plugin       .pnull       .profile   .pview     .qc        .qch         .qd
.qdate        .qdtools     .qlint     .qp        .qtr       .qu          .qurl
.rch          .refactor    .registry  .rt        .sc        .signal      .skia
.skiaw        .ss          .st        .str       .table     .tmut        .tr
.tz           .utl         .vcs       .visgg     .vm        .ws          .wsi
.wsu          .wws

In future releases, most of the above namespaces will be prefixed with .ax to reduce potential collisions. Namespaces that appear in the Developer Function Reference will not be renamed and can be relied on.