[QPID-8297] [Broker-J][JDBC Message Store][Oracle] QPID_MESSAGE_CONTENT reserved space keeps growing until it reaches the limit and crashes

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: qpid-java-broker-7.1.0
• Fix Version/s: qpid-java-broker-7.1.3
• Component/s: Broker-J
• Assignee: Alex Rudyy
• Reporter: Olivier VERMEULEN
• Created: 08/Apr/19 09:35
• Updated: 19/Feb/20 10:37
• Resolved: 10/Apr/19 12:16

Description

Under a continuous high load, the Oracle message store crashes because the reserved space for the table QPID_MESSAGE_CONTENT keeps on growing (even if the table itself is empty since we consume as fast as we produce).

This only happens for "big" messages (over 4KB) and comes from the way Oracle handles the LOB types (content column is declared as a BLOB). For LOB values over 4KB Oracle reserves some space in the table to handle the value but, by default, it won't actually release it (even if the value is removed) before a few hours.

So when we have a high load of big messages that lasts a few hours we end up reaching the max size of the tablespace and the database crashes...

Issue Links

• links to: GitHub Pull Request #24