[SAMZA-67] Maintain alignment in streams when using the DefaultChooser

• Type: New Feature
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 0.6.0
• Component/s: container
• Assignee: Unassigned
• Reporter: Chris Riccomini
• Created: 28/Oct/13 18:19
• Updated: 28/Oct/13 18:21

Description

The DefaultChooser currently defaults to a RoundRobinChooser when no chooser is specified in config. This means that, by default, we just round robin over which stream's messages to process next.

It might be possible to come up with a better strategy than round robin in this scenario. This problem is outlined in detail in:

https://wiki.apache.org/samza/Pluggable%20MessageChooser

The most interesting and intuitive strategy seems to be to try and maintain the alignment of the streams at the time the job starts (the fourth strategy outlined in the wiki proposal).

Also, see SAMZA-2 for more discussion on this.

Issue Links

• relates to: SAMZA-2 Fine-grain control over stream consumption