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Developer's Report: Firebird Core Development & Coordination
June to August 2016
August 2016
Built-in replication:
  • Fixed user-defined filters wrongly affecting system tables
  • Fixed "blob not found" errors during asynchronous replication
  • Reworked internals to better fit the v4 codebase, revisited replication API
Other v4 development:
  • Discussed and reviewed pull requests by RedSoft
  • Draft implementation for CORE-1132 and CORE-2040 (proposed for discussion via pull request #46)
  • Slightly refactored csb initialization to better control its lifetime (related to CORE-809)
  • Reviewed and merged pull requests #44 and #45
v3 bugfixing:
  • CORE-5329: Database gets partially corrupted in the "no-reserve" mode (debugged and suggested solution to Vlad)
July 2016
Built-in replication:
  • Auto-restart replication from the first available segment
  • Fixed late deletion of already replicated segments
  • Resolved issue with stuck replication if more then 2000 archive segments are pending
  • Added verbose logging option (for debugging purposes)
Auto-updated statistics:
  • Initial concepts discussion with Vlad
Other v4 development:
  • Discussed and reviewed pull requests by RedSoft
  • Fixed regression (inifinite loop) in the optimizer related to the cross joins handling
v3 bugfixing:
  • CORE-5307: Random 'invalid transaction handle' errors are returned from the engine
  • CORE-5246: String truncation error while selecting from MON$ tables if some user-defined context variable exceeds 255 bytes in length
  • Postfix for CORE-5277: zero-initialize strings allocated for (? IS NULL) parameters to avoid garbage being read while validating the length
  • Fixed server crash after Adriano's commit (transient bug)
Generic bugfixing (all versions):
  • CORE-5236: IN/ANY/ALL predicates may cause sub-optimal (late filtering) execution of joins
June 2016
Built-in replication:
  • Fixed permission issue for journal segments (Linux only)
  • Changed the control file format, partial implementation of the safe journal replay
  • Fixed lockups when the journal directory does not exist
  • Completed porting the existing replication code to the v3/v4 codebase
Other v4 development:
  • Bumped ODS version to 13.0, adjusted the engine libary name and other dependencies
  • Reviewed and merged pull requests #29, #35, #38
v3 bugfixing:
  • CORE-5268: Nested OR conditions may lead to incorrest results
  • CORE-5154: Services API don't work with non-ascii database names (ported from aafemt/firebird)
Generic bugfixing (all versions):
  • CORE-5275: Expression index may become inconsistent if CREATE INDEX was interrupted after b-tree creation but before commiting
Dmitry Yemanov
Penza, Russia
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