- **Milestone**: future --> 5.0.FC
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** [tickets:#1621] cpsv: add support for 'cloud resilience' feature**
**Status:** review
**Milestone:** 5.0.FC
**Created:** Mon Dec 07, 2015 08:03 AM UTC by Pham Hoang Nhat
**Last Updated:** Wed Dec 23, 2015 09:07 AM UTC
**Owner:** Pham Hoang Nhat
This enhance supports to preseve checkpoint replicas in case both SCs down
(headless state) and recover replicas in case one of SCs up again. If both SCs
goes down, checkpoint replicas on surviving nodes still remain. When a SC is
available again, surviving replicas are automatically registered to the SC
checkpoint database. Content in surviving replicas are intact and synchronized
to new replicas. When no SC is available, client API calls changing checkpoint
configuration which requires SC communication, are rejected.
Client API calls reading and writing existing checkpoint replicas still work.
Limitation:
The CKPT service doesn’t support recovering checkpoints in following cases:
• The checkpoint which is unlinked before headless.
• The non-collocated checkpoint has active replica locating on SC.
• The non-collocated checkpoint has active replica locating on a PL and
this PL restarts during headless.
In these cases, the checkpoint replica is destroyed. The fault code
SA_AIS_ERR_BAD_HANDLE is returned when the client accesses the checkpoint. The
client must re-open the checkpoint.
While in headless condition, accessing checkpoint replicas doesn’t working if
the node which hosts the active replica goes down. It will back working when a
SC available again.
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