[IGNITE-9763] MVCC: Document TX updates visibility changes for continuous queries.

• Type: Task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.7
• Component/s: documentation, mvcc
• Ignite Flags: Docs Required
• Assignee: Artem Budnikov
• Reporter: Roman Kondakov
• Created: 02/Oct/18 09:40
• Updated: 07/Nov/18 11:54
• Resolved: 07/Nov/18 11:54

Description

We should document visibility behaviour changes for MVCC transactions in Continuous Queries context: when MVCC transaction completes, it's updates are not visible immediately for the new transaction even they are started in continuous query listener. This is caused by the lag between transaction completes on the node and mvcc coordinator removes this transaction from the active list. Therefore all transactions started during this little time gap between these events will see just completed transaction as active in their snapshot, and, consequently, can't observe it's updates.

Issue Links

• is related to: IGNITE-7953 MVCC TX: continuous queries
• is related to: IGNITE-9435 Document MVCC
• relates to: IGNITE-9888 Document MVCC continuous queries