How many subtrees would you typically have? If the entire campaign is ONE tree you could delete the entire campaign as one cascading delete. That would actually be a better solution than deleteing lots of objects individually since one cascading delete will be one Sqlite wrtite/transaction. Of course the only reason you need to delete the persistent structure, is because you made it persistent. The irony is that the Persistence is a total waste of resources for all campaigns except where there is a step that has a planned cluster restart.
The term "safe" is relative. What I am worried about is the risk that a burst of individual PRTO writes on the order of say 100 or more, that could hog the PBE indefinitely. The problem here is the queue buildup, where the application would get ERR_TIMEOUT instead of ERR_TRY_AGAIN. Particlarly if an SC is restarting and DRBD syncing at the same time. Yes enable of PBE will regenerate the database and that also takes time, but services will get TRY_AGAIN in this state when attempting persistent writes. So this is much better behaved and services must be Designed so that they can deal with this. But few services are equiped to deal well with getting repeated ERR_TIMEOUT (on persistent write requests). /AndersBj -----Original Message----- From: Ingvar Bergström Sent: den 19 december 2013 14:04 To: Anders Björnerstedt; Bertil Engelholm Cc: opensaf-devel@lists.sourceforge.net Subject: RE: [devel] [PATCH 0 of 1] Review Request for SMF #677 If we switch on PBE in completed state, then switch off PBE at start of commit, then again switch on PBE at end of commit. Is this more effective than keep the PBE on during commit? I guess the IMM content is dumped twice if turned off during commit? I hope IMM is safe, so what would be safer? I thought the performance was the main concern. I don't know if it matters but SMF PTRO are deleted subtree by subtree where the top of the trees are the procedure objects. So there are a very limited number of delete operations to delete SMF internal objects. You see no problem switching PBE on/off/on in sequence? If the user commits the campaign fast, the first PBE on may not be finished before PBE off and then PBE on are received again. /Ingvar -----Original Message----- From: Anders Björnerstedt Sent: den 19 december 2013 11:20 To: Ingvar Bergström; Bertil Engelholm Cc: opensaf-devel@lists.sourceforge.net Subject: RE: [devel] [PATCH 0 of 1] Review Request for SMF #677 Well the problem I am worried about is if there is alreg number of PRTOs to be deleted, Then that is definitely a risky operation in itself with PBE turned on. But if you have deleted the bulk of the SMF PRTOs before the PBE is turned on, then no problem. The advantage of turning off the PBE again would then be IF there may be a substantial number of PRTOs to be deleted, then that would be safer (less risk of service unavailability). /AndersBj -----Original Message----- From: Ingvar Bergström Sent: den 19 december 2013 11:06 To: Anders Björnerstedt; Bertil Engelholm Cc: opensaf-devel@lists.sourceforge.net Subject: RE: [devel] [PATCH 0 of 1] Review Request for SMF #677 That's a valid question. The difference to the existing solution is that the wrapup actions (if any) which are executed at commit will be executed with PBE turned on. Normally a limited number of IMM operations are defined in the campaign wrapup portion of the campaign. That's the reason PBE in the proposal is not turned off again for the commit. To me the advantage of turning off/on PBE for the commit operation is very limited. /Ingvar -----Original Message----- From: Anders Björnerstedt Sent: den 19 december 2013 09:36 To: Ingvar Bergström; Bertil Engelholm Cc: opensaf-devel@lists.sourceforge.net Subject: RE: [devel] [PATCH 0 of 1] Review Request for SMF #677 One question on this SMF enhancement. I understand that PBE will be switched on towards the end of a campaign, but earlier than before. Does this mean that there remains a phase of cleanup/deletes of lots of PRTOs to be done after testing ? If so then *maybe* PBE should be turned off again, during the final cleanup of campaign PRTOs, then on again. /AndersBj -----Original Message----- From: Ingvar Bergstrom [mailto:ingvar.bergst...@ericsson.com] Sent: den 19 december 2013 08:49 To: Bertil Engelholm Cc: opensaf-devel@lists.sourceforge.net Subject: [devel] [PATCH 0 of 1] Review Request for SMF #677 Summary: smfd: turn on PBE in state completed Review request for Trac Ticket(s): 677 Peer Reviewer(s): bertil Pull request to: Affected branch(es): default Development branch: default -------------------------------- Impacted area Impact y/n -------------------------------- Docs n Build system n RPM/packaging n Configuration files n Startup scripts n SAF services n OpenSAF services y Core libraries n Samples n Tests n Other n Comments (indicate scope for each "y" above): --------------------------------------------- smfd: turn on PBE in state completed changeset bf8be15d6ab7daa218e2cf530d0064a0efabf0f5 Author: Ingvar Bergstrom <ingvar.bergst...@ericsson.com> Date: Thu, 19 Dec 2013 08:45:32 +0100 smfd: turn on PBE in state completed [677] To avoid the need of restore in case of cluster reboot, SMF turn on PBE in completed state. Complete diffstat: ------------------ osaf/services/saf/smfsv/smfd/SmfCampState.cc | 14 +++++++++++--- osaf/services/saf/smfsv/smfd/SmfUpgradeCampaign.cc | 2 +- 2 files changed, 12 insertions(+), 4 deletions(-) Testing Commands: ----------------- Testing, Expected Results: -------------------------- Conditions of Submission: ------------------------- Arch Built Started Linux distro ------------------------------------------- mips n n mips64 n n x86 n n x86_64 y y powerpc n n powerpc64 n n Reviewer Checklist: ------------------- [Submitters: make sure that your review doesn't trigger any checkmarks!] Your checkin has not passed review because (see checked entries): ___ Your RR template is generally incomplete; it has too many blank entries that need proper data filled in. ___ You have failed to nominate the proper persons for review and push. ___ Your patches do not have proper short+long header ___ You have grammar/spelling in your header that is unacceptable. ___ You have exceeded a sensible line length in your headers/comments/text. ___ You have failed to put in a proper Trac Ticket # into your commits. ___ You have incorrectly put/left internal data in your comments/files (i.e. internal bug tracking tool IDs, product names etc) ___ You have not given any evidence of testing beyond basic build tests. 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