[HDDS-1868] Ozone pipelines should be marked as ready only after the leader election is complete

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.4.0
• Fix Version/s: 0.5.0
• Component/s: Ozone Datanode, SCM
• Labels: pull-request-available
• Assignee: Siddharth Wagle
• Reporter: Mukul Kumar Singh
• Created: 26/Jul/19 15:31
• Updated: 25/Feb/20 18:06
• Resolved: 12/Nov/19 15:55

Description

Ozone pipeline on create and restart, start in allocated state. They are moved into open state after all the pipeline have reported to it. However, this potentially can lead into an issue where the pipeline is still not ready to accept any incoming IO operations.

The pipelines should be marked as ready only after the leader election is complete and leader is ready to accept incoming IO.

Issue Links

• blocks: HDDS-2242 Avoid unnecessary rpc needed to discover the pipeline leader
• incorporates: HDDS-2714 Add Ratis leader info for scm pipeline info command
• relates to: HDDS-3038 TestRatisPipelineLeader fails since we no longer wait for leader in the HealthyPipelineSafeModeExitRule
• links to: GitHub Pull Request #23