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= [WIP] Erlang 21 =
= Erlang 21 =
== Summary ==
== Summary ==

Revision as of 14:03, 20 November 2018

Erlang 21


Update Erlang/OTP to version 21.


Current status

Detailed Description

Upgrade Erlang to version 21 which brings a lot of changes. Just a few highlights:

  • The BEAM interpreter has been completely re-written.
  • The compiler is about 10-20% faster.
  • Enhanced and improved IO handling.
  • All CORBA libraries were splitted off to independent repository.
  • Insecure crypto algorithms were disabled.
  • Non-smp VM removed.
  • New API for logging, logger.
  • The zlib module has been refactored and all its operations will now yield appropriately, allowing them to be used freely in concurrent applications.

Aside from this, we plan to improve quality of Erlang and related packages. These are shortcomings we want to address:

  • Every daemon written in Erlang has its own logging solution which doesn't use neither syslog nor Journald. We should start switching them to Journald.
  • We should add ability to use D-Bus via erlang-dbus library.
  • Further improve Erlang Packaging Guidelines and promote it as the official guideline.
  • Finish building noarch Erlang packages we've implemented previously.

Benefit to Fedora

Fedora users, both developers and end-users, will have visible benefits from using Fedora-provided packages. Namely:

  • Even faster and smoother IO in Erlang.
  • Improved logging, better unified with the rest of system.


Upgrade/compatibility impact

  • Every Erlang upgrade requires the rebuilding of modules which contains ports or NIFs, and we will rebuild all such modules in Fedora. However if a user has some additional modules not available in a Fedora repository, then these modules must be rebuilt manually.

How To Test

  • Ensure that high-grade Erlang applications are still working:
Name Tested
Package-x-generic-16.pngcouchdb No
Package-x-generic-16.pngejabberd No
Package-x-generic-16.pngelixir No
Package-x-generic-16.pngmochiweb No
Package-x-generic-16.pngrabbitmq-server No
Package-x-generic-16.pngriak No (package was retired :( )
Package-x-generic-16.pngwings No
  • Collect feedback from volunteers regarding their experience with this Erlang/OTP version

User Experience

Users will get more robust, scalable, and fast Erlang applications.


The following packages must be rebuilt:

Name Rebuilt
Package-x-generic-16.pngcouchdb No
Package-x-generic-16.pngerlang-basho_metrics No
Package-x-generic-16.pngerlang-bitcask No
Package-x-generic-16.pngerlang-cache_tab No
Package-x-generic-16.pngerlang-cl No
Package-x-generic-16.pngerlang-ebloom No
Package-x-generic-16.pngerlang-eleveldb No
Package-x-generic-16.pngerlang-emmap No
Package-x-generic-16.pngerlang-erlsyslog No
Package-x-generic-16.pngerlang-esasl No
Package-x-generic-16.pngerlang-esdl No
Package-x-generic-16.pngerlang-esip No
Package-x-generic-16.pngerlang-fast_tls No
Package-x-generic-16.pngerlang-fast_xml No
Package-x-generic-16.pngerlang-fast_yaml No
Package-x-generic-16.pngerlang-hyper No
Package-x-generic-16.pngerlang-iconv No
Package-x-generic-16.pngerlang-jiffy No
Package-x-generic-16.pngerlang-js No
Package-x-generic-16.pngerlang-lfe No
Package-x-generic-16.pngerlang-riak_ensemble No
Package-x-generic-16.pngerlang-sd_notify No
Package-x-generic-16.pngerlang-skerl No
Package-x-generic-16.pngerlang-snappy No
Package-x-generic-16.pngerlang-stringprep No
Package-x-generic-16.pngerlang-xmpp No

Contingency Plan

  • Contingency mechanism: None necessary. Instead of falling back to the previous version we should fix existing packages in order to help the Community. We should also monitor upstream development process for potentially discovered issues and proactively apply patches (as we already did with Erlang R14, Erlang R15, Erlang R16, Erlang 17), Erlang 18, Erlang 19, and Erlang 20. It should be noted that this change consists from an independent or loosely coupled smaller changes. If we fail to deliver some changes in time, we should reschedule these exact changes to the future Fedora release while keeping already implemented ones.
  • Contingency deadline: N/A
  • Blocks release? N/A
  • Blocks product? N/A


Release Notes

Erlang/OTP 21.1 is available in Fedora 30.