Wire compression causes freezes in FB 3.0.6
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Key: CORE-6348
URL: http://tracker.firebirdsql.org/browse/CORE-6348
Project: Firebird Core
Issue Type: Bug
Components: Engine
Affects Versions: 3.0.6
Environment: Tested on Win 10 and virtual Ubuntu 20.04 (server side)
with 64 bit FB 3.0.6, client app at Win 10.
Reporter: michalk1
Extracted from CORE-6346, as it is likely an independent issue. Active wire
compression causes periodic blocks in FB 3.0.6. I first noticed it when
inserting large binary blobs and executing long ddl statements, but probably
affects all TCP communication.
The blocks last for up to several minutes, during which there is no obvious
server activity (minimum CPU/HDD/Network load), so it looks rather like a
timeout. The process eventually resumes (no error message), but the problem
repeates soon after (on another blob segment or ddl command).
To reproduce the problem, it it sufficient to try to insert a large file (say
Firebird installation exe file) into a binary blob field when wire compression
is active. In FB 3.0.5 it takes just a second, while in 3.0.6 it would now
probably last tens of minutes.
Workaround is either to disable the wire compression or switch back to FB 3.0.5.
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