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- CDAP and CDAP Applications have the ability to withstand short and transient infrastructural outages
- During interruption of underlying services (one or more), CDAP or CDAP Applications can operate under degraded performance/limited functionalities
- Users will not be able to perform operations like deploying apps, starting programs or new data or application lifecycle operations.
- However all the applications that are running, should be running
- Users will not be able to perform operations like deploying apps, starting programs or new data or application lifecycle operations.
- Once interruption in the underlying service is resolved or services come back to normal operation, the CDAP and CDAP Application will go back to normal state
- Interruptions in service would be due to node failure, service failures or compatible rolling upgrades or downgrades in progress
- Does not include in-compatible upgrades or downgrades of underlying infrastructure
- Does not include long unavailability of service and infrastructure
Resiliency Scenarios
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Maintenance of underlying infrastructure
Administrators
High Level Requirements
- Compatible Upgrade or Downgrade of underlying infrastructure Hadoop components
- Underlying Hadoop infrastructure is either being upgraded or downgraded and the expectation is that CDAP and CDAP Applications would should tolerate and be resilient to infrastructure services not being available during the upgrade or downgrade process.
- The upgrade or downgrade process could take anywhere between 30 mins - 18 hours or more.
- During this period the period of service unavailability or interruption, the CDAP and CDAP Applications can operate in degraded mode.
- The Hadoop infrastructure upgrade / downgrade has to be compatible with CDAP and CDAP Application in order to have smooth upgrades
- In case, there are issues during the upgrade, CDAP should also be resilient to rollbacks
- CDAP and CDAP Applications should also be able to withstand compatible downgrades
- The compatibility matrix should be available to users to ensure smooth upgrades
- Upgrade / Downgrade of CDAP
- Upgrade the version of CDAP. Major and Minor CDAP version, major and minor version could have different impacts. We will discuss about these impact further in the document.
- Rolling back the upgrade process
- CDAP version compatible matrix available to users
- Upgrade / Downgrade of CDAP Applications
Upgrade or Downgrade of Hadoop Infrastructure
The underlying Hadoop Infrastructure can be subjected to upgrade or downgrade anytime. The
Use cases
- User wants to upgrade the underlying Hadoop distribution (CDH / HDP / MapR / BigTop) within a major release
- User wants to perform rolling upgrade of the underlying infrastructure
- User
Upgrade / Downgrade of CDAP
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Maintenance of underlying infrastructure
Administrators
Open Item/Discussion point
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