[MESOS-1944] Support streaming read for replicated log

• Type: Story
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Component/s: replicated log
• Assignee: Unassigned
• Reporter: Jie Yu
• Created: 17/Oct/14 17:55
• Updated: 28/Sep/16 19:08

Description

It'll be great if replicated log can support streaming read so that the user can specify a start position and get a stream object. He can then read from that stream object. This would allow users to perform reads on a follower.

If an unlearned position is encountered, there are couple of options. One option is to wait until it gets learned. However, it's likely that that position never gets learned. We also don't wanna blindly do active read (full paxos round) because it will possibly demote the leader. One solution is to wait for the next learned event and then do active read for the positions in-between.

Issue Links

• relates to: MESOS-6267 Mesos master should periodically compact the replicated log