[IMPALA-5997] Provide a way to gracefully shutdown an Impala Daemon

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Epic Color: ghx-label-3
• Assignee: Unassigned
• Reporter: Quanlong Huang
• Created: 29/Sep/17 13:58
• Updated: 09/Oct/17 23:17
• Resolved: 09/Oct/17 23:17

Description

Currently if we shutdown an impalad, queries running on it will all fail. This is bad in a BI system integrating with Impala as its query engine. If we perform maintenance on the impala cluster, we hope users are not aware of it. For example, to decomission impalads in a rack to retire old machines, we hope these impalads not accept new PlanFragments and shutdown when their existing work is done.

Presto provides such a way since 0.128: https://prestodb.io/docs/current/release/release-0.128.html

• Presto workers can be instructed to shutdown by submiting a PUT request to /v1/info/state with the body "SHUTTING_DOWN". Once instructed to shutdown, the worker will no longer receive new tasks, and will exit once all existing tasks have completed.

Hope we can provide a way to do so.

Issue Links

• duplicates: IMPALA-1760 Add Impala SQL command to gracefully shut down an Impala daemon