- **Comment**:
On 7/7/2014 1:28 PM, Anders Bjornerstedt wrote:
Yes one could optimize this in the sense of not checkpointing the whole
message, but one has to checkpoint part of it and the resend done at failover
would need to resend the truncated message.
The receiving IMMNDs would need to detect the message as a truncated sync
message and discard it.
All this is necessary to not have gaps in the fevs count.
Most fevs messages pass though the IMMD without being unpacked, so the IMMD
does not know if a particular message is a sync message or not.
The standby IMMD must be in sync with the active IMMD before the active
broadcasts the fevs to the IMMNDs to prevent any gap in the fevs message
sequence.
Like all optimizations that are non trivial, whether to do it or not depends
on how prioritized it is.
You can test the relative difference in performance by executing the same sync
with or without any standby SC, to sync payloads.
---
** [tickets:#952] immsv: sync data Mbcsv Check pointing can be optimized**
**Status:** unassigned
**Milestone:** future
**Created:** Tue Jul 08, 2014 03:31 AM UTC by A V Mahesh (AVM)
**Last Updated:** Tue Jul 08, 2014 03:31 AM UTC
**Owner:** nobody
On 7/7/2014 9:58 AM, A V Mahesh wrote:
While IMMD broadcasting datasync message (IMMND_EVT_D2ND_GLOB_FEVS_REQ_2)
to IMMNDs additionally the same message (including large sync data) getting
Check pointed to standby director , this means for eachdata`sync FEVS message
(IMMND_EVT_D2ND_GLOB_FEVS_REQ_2) IMMD is sending two messages one to IMMND's as
BCAST and one to peer IMMD as R-BCAST (MBCSV).
Currently in my observation if fault happens when sync is in-progress that sync
gets aborted ,
and the new active is starting a fresh sync. If my understanding is right ,
why we need to Check point IMMND_EVT_D2ND_GLOB_FEVS_REQ_2 message to peer IMMD
including large sync data?
---
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