Summary: failover using OPENSAF_MANAGE_TIPC flag and failover after down of critical services [#721] Review request for Trac Ticket(s): #721 Peer Reviewer(s): [email protected], [email protected] Pull request to: <<LIST THE PERSON WITH PUSH ACCESS HERE>> Affected branch(es): opensaf-4.4.x, default Development branch: <<IF ANY GIVE THE REPO URL>>
-------------------------------- 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): --------------------------------------------- Two cases are supported by this patch 1) Failover in 4.4.x, and default will be the same as previous releases. i.e. as usual FM trigerres failover upon receiving the NODE_DOWN event. 2) The main goal of the patch is w.r.t failover without OS reboot through /etc/init.d/opensafd stop is more controlled now in the scenario "when amfnd itself crashes". FM trigers failover after DOWNs of AMF, IMM and FM. More info of these cases: 1) The flag OPENSAF_MANAGE_TIPC=yes is used to control when failover is trigerred. This way, the default failover behaviour will now be the same as the previous releases. There is no change involved. 2) In the usecase of failover (involving /etc/init.d/opensafd stop) without OS reboot cycle, the flag nid.conf is set to OPENSAF_MANAGE_TIPC=no. This usecase is currently intact, however some considerations need to be made ito handle the scenrio when amfnd itself crashes. For this FM shall subscribe to service downs of AMFD, AMFND, IMMD, IMMND AND FM and "FM by way of installing amfnd_down_callback shall exit only when the OS reboot terminates FM". The peer FM will the failover once downs of all these services are received. changeset c1875b7073b5fa2a1b9ae8755a15f6e8a6bf1aaf Author: Mathivanan N.P.<[email protected]> Date: Wed, 29 Jan 2014 23:08:05 +0530 fm: failover using OPENSAF_MANAGE_TIPC flag and subscribe to AMF, IMM downs [#721] To support failover without OS reboot, FM subscribed to AMFND down events. But this may not be sufficient in scenarios when AMFND itself crashes or exits. In this scenario, the exit/kill of OpenSAF processes need not be in order and immediate. This can create a scenario where some OpenSAF process may still be running, but FM has already started failover processing. To avoid this, FM subscribes to the down events of critical opensaf services - AMFD, AMFND, IMMD, IMMND In a false/quick failover scenario, these are the services that can lead to problems like implementerset not cleared or dangling AMF state assignments. Currently, all OpenSAF services exit upon receiving the AMFND down events, but even this does not guarantee immediate and ordered delivery of down events. The next patch in this series of 2 patches makes FM to install ava_amfnd_down_callback such that FM waits forever till the OS kills FM. changeset 77232a084d58b68c8b470f7b90fa6a2df541183d Author: Mathivanan N.P.<[email protected]> Date: Wed, 29 Jan 2014 23:13:27 +0530 fm: install ava_install_amf_down_cb and wait till OS reboot terminates FM [#721] FM installs amfnd down callback and upon receiving the amfnd down event, shall wait till the OS reboot(trigerred by amfnd crash or exit) terminates FM. The STANDBY FM will now start the failover after recieving the downs of all AMFD, AMFND, IMMD, IMMND and FM Complete diffstat: ------------------ osaf/services/infrastructure/fm/fms/fm.h | 2 + osaf/services/infrastructure/fm/fms/fm_amf.c | 18 +++++++++++ osaf/services/infrastructure/fm/fms/fm_cb.h | 8 +++++ osaf/services/infrastructure/fm/fms/fm_evt.h | 2 + osaf/services/infrastructure/fm/fms/fm_main.c | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++-- osaf/services/infrastructure/fm/fms/fm_mds.c | 155 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------------------------------ osaf/services/infrastructure/fm/fms/fm_mds.h | 1 + osaf/services/infrastructure/nid/config/nid.conf | 2 +- 8 files changed, 222 insertions(+), 52 deletions(-) Testing Commands: ----------------- 1) Start a opensaf cluster. Trigerr failover by all known means i.e. /etc/init.d/opensafd stop or kill or director components or of amnfnd. 2) edit nid.conf and set OPENSAF_MANAGE_TIPC=no. /usr/lib64/opensaf/configure_tipc start eth0 1234 Start opensaf. Trigger failover by all known means. Testing, Expected Results: -------------------------- Failover should work. Conditions of Submission: ------------------------- Ack from Ramesh and/or AndersW 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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