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Developer's Report: Firebird Core Development
May 2014 to January 2015

May 2014

Trunk
  • Front ported fix for bug CORE-4372 : Deadlock is possible when two data pages contains record fragments pointing to each other
  • Front ported: Improvement CORE-4431 : Reduce contention for allocation table lock while database is in stalled physical backup state
  • Front ported: Improvement CORE-4432 : Let attachments to not block others when allocation table is read first time
  • Front ported: On Windows, file can not be deleted while system writes cached data into it, even if file is not open by anyone. Therefore flush delta file implicitly before closing it.
  • Front ported fix for bug CORE-4433 : GlobalRWLock could not downgrade EX lock to SH if readers is present
B2_5_Release
  • Improvement CORE-4431 : Reduce contention for allocation table lock while database is in stalled physical backup state
  • Improvement CORE-4432 : Let attachments to not block others when allocation table is read first time
  • On Windows, file can not be deleted while system writes cached data into it, even if file is not open by anyone. Therefore flush delta file implicitly before closing it.
  • Fixed bug CORE-4433 : GlobalRWLock could not downgrade EX lock to SH if readers is present
  • Implement support for fallocate() call on Linux.
  • Implement improvement CORE-4443 : Use fast file grow on those Linux systems which supports it
  • Fixed bug CORE-4444 : Engine could hung and block all attachments in out of disk space condition during physical backup
  • Improvement CORE-4445 : Extend main database file faster when physical backup state changed from stalled to merge
B2_1_Release
  • Backported fix for bug CORE-2349 : False "Invalid SQLDA" error
June 2014

Trunk
  • New boolean setting was added into fbtrace.conf: explain_plan.
  • Front ported support for fallocate() call on Linux.
  • Front ported improvement CORE-4443 : Use fast file grow on those Linux systems which supports it
  • Front ported fix for bug CORE-4444 : Engine could hung and block all attachments in out of disk space condition during physical backup
  • Front ported improvement CORE-4445 : Extend main database file faster when physical backup state changed from stalled to merge
  • Implement improvement CORE-4451 : Allow output to trace explain plan form
July 2014

Trunk
  • Avoid races (and AV as result) when two attachments starts to use temporary page space simultaneously.
  • Cleanup and optimize locking a bit (as suggested by Dmitry).While i don't see how we can have positive scale, wrong code should be fixed anyway
August 2014

Trunk
  • Fixed bug CORE-4510 : AV in validation is possible
  • Missing notification of gc thread.
  • Avoid info duplication when statements in call stack attached to different transactions (for example: monitoring snapshot is created in autonomous transaction)
B2_5_Release
  • Backport: avoid info duplication when statements in call stack attached to different transactions (for example: monitoring snapshot is created in autonomous transaction)
September 2014

Trunk
  • Implement improvement CORE-4556 : Allocate data pages in group of sequential ordered pages (extents)
  • Improvement CORE-4562 : Split all validation messages on critical and minor ones
October 2014

Trunk
  • Fixed bug CORE-4565 : GDSCODE can have value = 0 in WHEN-section under some concurrent env., only in SC or CS (not in SS)
  • Improvement CORE-4562 : Split all validation messages on critical and minor ones.Additional patch, see details in tracker
  • Fixed bug CORE-4575 : AV in garbage collector thread at disconnect of last attachment
  • Fixed bug CORE-4576 :  Cache Writer thread could not start
  • Fixed wrong item "unknown ISC error 0" in error messages
  • Improved page cache performance a bit.
November 2014

Ttrunk
  • Add support for MSVC12 (VS 2013)
  • Fixed compilation errors on Windows after IPv6 patches
  • Small optimization by Dimitry Sibiryakov:set ppg_min_space to the next really non-full slot when current ppg_min_space slot is marked as full.
  • Add check if IPv6 is supported by OS.
  • Windows implementation is complete, while POSIX implementation should be reviewed and fixed if necessary.
  • Move ConfigRoot from common to the yvalve. Add its methods to the public interface ConfigManager. Now all plug-ins have the same root\install folders.It should fix CORE-4581 and related issues.
  • Fix build errors when WIRE_COMPRESS_SUPPORT not defined
B2_5_Release
  • Fixed bug CORE-4615 : Classic Server could hung with (near) 100% CPU load
  • Fixed bug CORE-4627 : Deadlock with TIP page lock and monitoring lock
December 2014

Trunk
  • Add pre-built zlib library
  • Support for zlib on Windows
  • Patches for mingw by Alexey Pavlov :
-  Fix using function pointer
-  Mingw compilers don't support Win98
-  Mingw also have posix threads library so to resolve conflict we need guard using posix threads for Windows.
-  Don't use hack for mingw-w64

January 2015

Trunk
  • Fixed my error at patch for CORE-4565. It was the reason of false "lock denied" errors.
  • Make shared memory header same size independent on OS.
  • Introduce shared memory header version.
  • Frontportred fix for bug CORE-2848 : "lock conversion denied" or "lock denied" error
  • Improvement CORE-4671 : Release internal temporary blobs early to free some memory\disk space
B2_5_Release
  • Improvement CORE-4671 : Release internal temporary blobs early to free some memory\disk space
Vladyslav Khorsun
Dnetpropetrovsk, Ukraine
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