[GEODE-7066] Events can be lost in a gateway batch containing duplicate non-conflatable events with conflation enabled

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.9.0
• Fix Version/s: 1.11.0
• Component/s: wan
• Assignee: Barrett Oglesby
• Reporter: Barrett Oglesby
• Created: 09/Aug/19 00:09
• Updated: 30/Dec/19 18:51
• Resolved: 26/Aug/19 17:13

Description

If a batch contains duplicate CREATE and DESTROY events on key 1736 like below and conflation is enabled, the earlier events will be overwritten by the later events.

GatewaySenderEventImpl[id=EventID[id=31bytes;threadID=0x30004|6;sequenceID=6072];operation=CREATE;region=/SESSIONS;key=6079],
GatewaySenderEventImpl[id=EventID[id=31bytes;threadID=0x30004|6;sequenceID=6073];operation=UPDATE;region=/SESSIONS;key=6079],
GatewaySenderEventImpl[id=EventID[id=31bytes;threadID=0x30004|5;sequenceID=6009];operation=CREATE;region=/SESSIONS;key=1736],
GatewaySenderEventImpl[id=EventID[id=31bytes;threadID=0x30004|6;sequenceID=6074];operation=DESTROY;region=/SESSIONS;key=6079],
GatewaySenderEventImpl[id=EventID[id=31bytes;threadID=0x30004|5;sequenceID=6011];operation=DESTROY;region=/SESSIONS;key=1736],
GatewaySenderEventImpl[id=EventID[id=31bytes;threadID=0x30004|6;sequenceID=6087];operation=CREATE;region=/SESSIONS;key=1736],
GatewaySenderEventImpl[id=EventID[id=31bytes;threadID=0x30004|6;sequenceID=6089];operation=DESTROY;region=/SESSIONS;key=1736]

The batch will look like this after conflation:

GatewaySenderEventImpl[id=EventID[id=31 bytes;threadID=0x30004|6;sequenceID=6072];operation=CREATE;region=/SESSIONS;key=6079], 
GatewaySenderEventImpl[id=EventID[id=31 bytes;threadID=0x30004|6;sequenceID=6073];operation=UPDATE;region=/SESSIONS;key=6079], 
GatewaySenderEventImpl[id=EventID[id=31 bytes;threadID=0x30004|6;sequenceID=6087];operation=CREATE;region=/SESSIONS;key=1736], 
GatewaySenderEventImpl[id=EventID[id=31 bytes;threadID=0x30004|6;sequenceID=6074];operation=DESTROY;region=/SESSIONS;key=6079], 
GatewaySenderEventImpl[id=EventID[id=31 bytes;threadID=0x30004|6;sequenceID=6089];operation=DESTROY;region=/SESSIONS;key=1736]

All the events from threadID=0x30004|5 are gone.

Issue Links

• links to: GitHub Pull Request #3909