Hao Zhang created HELIX-741:
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Summary: Revise unreliable behavior in swapInstance
Key: HELIX-741
URL: https://issues.apache.org/jira/browse/HELIX-741
Project: Apache Helix
Issue Type: Task
Reporter: Hao Zhang
swapInstance call did not work properly when we were trying to fix a production
issue.
The API was old and not actively maintained. It used deprecated underlaying
data accessor API and hit a problem of partial ZK read. Thus our CLI was unable
to update all IdealStates as expected.
We have seen such problem before, especially when the cluster is bug and there
are a lot of data to read back.
This ticket is created to refactor the implementation of swapInstance() to make
it more robust, and separate ticket will be created to revise those old API
calls that are not frequently used not actively maintained.
–
AC:
- make this api call reliable and idempotent
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