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Developer's Report: QA Stress Testing & Tools Development
October 2017 - January 2018

January 2018
  • Found / reported bugs: CORE-5706, CORE-5724
  • Created / modified QA tests for 9 tracker tickets
  • Failed restore always sends error messages to STDOUT rather than to STDERR
  • Fixed tests with false negative results
  • Nbackup: unable to establish new attachments when delta is merged into main DB file
  • OLTP-EMUL: resumed refactoring in order to reduce occurences of pending request count entries
  • OLTP-EMUL, 300 attachments, 2.5.8 SC: database file remain opened by several fb_smp_server processes after closing all sessions
  • Tested asynchronous replication under load
December 2017
  • Found / reported bugs: CORE-5680, CORE-5684
  • Created / modified QA tests for 9 tracker tickets
  • fb_lock_print sends error message(s) "Unable to open the database file" / "Unable to access lock table" to STDOUT rather than STDERR
  • Parameter "log_errors = true" in the "Service" section of trace config did not lead to logging of restore error
  • CREATE DATABASE failed if user/password are specified after 'default character set' clause
  • Command "SHOW USERS" does not display authentification plugin that was used for creating of each user
  • Collected backtraces for long connection attempts under load
November 2017
  • Found / reported bugs: CORE-5664, CORE-5667
  • Created / modified QA tests for 11 tracker tickets 
  • Got "335544382 : request size limit exceeded" error when tried to execute "select from rdb$database LEFT JOIN <nested-view>" and nested depth is 5
  • Implemented auxiliary batch for generate DDL with a lot of master-child relations ("star" schema) and query using LEFT JOINS
  • Tested asynchronous replication under load
October 2017
  • Found / reported bugs: CORE-5640, CORE-5641, CORE-5643
  • Created / modified QA tests for 5 tracker tickets
  • Tested external connection pool per Vlad's request
  • Started implementing script that measures time to establish new connection and dumps backtraces
  • Found too slow (> 5s) connect to database when there are more than 1000+ attachments
  • OLTP-EMUL, 30 sessions (Win 8.1, 12 Gb RAM): too slow running "nbackup -N" when delta is more than 200 Mb

Pavel Zotov
Moscow, Russian Federation
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