9 April 2019

FIX Antenna HFT 1.0.13 release: breaking changes and new session property

B2BITS, EPAM Systems company is pleased to announce the release of version 1.0.13 FIX Antenna HFT.

Breaking changes:

  • Library for platform RHEL 6 using C++ 98 ABI is deprecated and will be removed from the package starting next release.
  • onIncommingConnection  callback API has been extended with delivering the port number for accepted connection.

New Features and Improvements:

  • Added a new session property  AllowGapFillWithoutPossDupFlag  to support some exchanges that stepping aside from FIX protocol restrictions and sending  GapFill (35=4) messages without  PossDup flag (43=Y) and avoid such sessions termination.
  • Add smart delay balancing logic to avoid wrong unsuccessful attempts of system calls to map cache of persistentCached storage type in case of very large log files being opened simultaneously.
  • Speedup detection of corrupted storages.
  • Added four public API methods which returning a list of ports for acceptors:

Critical bugs and fixes:

  • Fixed a bug when the engine can try to close random file descriptors at destroy.
  • Fixed a bug when engine stops sending heartbeats to all sessions if one session is locked e.g. due to long resend request.
  • Fixed a bug when any resend requests processing takes too much time (several seconds) on the large FIX-messages storages

Logging improvements:

  • Extended logging of incoming connection event with accepting port.

The complete  Release Notes are available in Products Knowledge Base.

New FIX Antenna HFT version is available to our customers in B2BITS Clients' Space and to anyone for evaluation per request - please direct requests for evaluation to


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