[ACCUMULO-4022] Create a concept of multi-homed tablets

• Type: Wish
• Status: Resolved
• Priority: Major
• Resolution: Abandoned
• Component/s: client, tserver
• Labels: performance
• Assignee: Unassigned
• Reporter: Marc Parisi
• Created: 08/Oct/15 13:14
• Updated: 28/Oct/20 23:18
• Resolved: 28/Oct/20 23:17

Description

I'm an accumulo newbie, but I wish to see the concept of multi-homed tablets. This allows us to have tablets hosted by multiple servers, with only one being writable against it. This concept would allow n receiver servers for a tablet. An example might be a tablet that has become a hot spot could be dynamically hosted elsewhere, and clients could pick this up as a potential. Consistency must be kept between the hosts, as the initial read/write host may compact or write to that tablet.

To me the larger problem may come from live ingest in which the write ahead log has not been flushed. To avoid having to write to the read only servers in a pipeline, we would likely need to create a model of enforcing reads only after a flush of that tablet or a thrift interface to allow reading only the data in memory to ensure consistency is enforced. I haven't given great thought to solving this yet.

Please comment with ideas and pitfalls as I would like to see this wish come to fruition with actionable tickets after some community thought.

Issue Links

• is related to: ACCUMULO-1495 Host multiple read-only versions of tablets for query performance