osaf/services/saf/immsv/README | 93 ++++++++++++++++++++++++++++++++++++++++++
1 files changed, 93 insertions(+), 0 deletions(-)
Update README with IMM enhancements
diff --git a/osaf/services/saf/immsv/README b/osaf/services/saf/immsv/README
--- a/osaf/services/saf/immsv/README
+++ b/osaf/services/saf/immsv/README
@@ -2748,6 +2748,99 @@ Return Values : SA_AIS_ERR_BUSY - The
Returncodes otherwise identical to saImmOmAccessorGet.
+
+SC Absence (5.0)
+===============================================
+https://sourceforge.net/p/opensaf/tickets/1625
+
+SC absence enhancement has the goal of increasing OpenSAFs resilience in
+the face of both active and standby SC going down. Both SCs being absent
+implies that all OpenSAF director services are absent indefinitely, until
+an SC is re-established. Prior to the SC absence enhancement, departure
+of both SCs always resulted in a cluster restart. With the SC Absence
+enhancement, payloads continue to provide reduced and limited service
+until an SC-active is re-established. For the IMM service, SC absence is
+configured by commenting in the environment variable IMMSV_SC_ABSENCE_ALLOWED.
+
+export IMMSV_SC_ABSENCE_ALLOWED=900
+
+Value of environment variable IMMSV_SC_ABSENCE_ALLOWED is stored in
+scAbsenceAllowed attribute in opensafImm=opensafImm,safApp=safImmService
+object. This value is used by AMF to restart the cluster if SC absence
+is longer than the value in scAbsenceAllowed attribute in seconds.
+
+Support for SC absence is incompatible with 2PBE. If both are configured
+then 2PBE will win and the SC absence feature will be ignored. An error
+message is printed in this case to the syslog at startup. Allowing SC absence
+feature is a configuration choice impacting all OpenSAF services, not just
+the IMM service. If it is to be allowed then it is not sufficient to only
+configure the IMM service for SC absence. The level of service that is
+provided during absent SC depends on the particular service. In the case
+of the IMM service, the service provided during SC absence is in essence
+only the reading of config data.
+
+
+Add attribute definition flag SA_IMM_ATTR_STRONG_DEFAULT (5.0)
+===============================================================
+https://sourceforge.net/p/opensaf/tickets/1425
+
+Having SA_IMM_ATTR_STRONG_DEFAULT flag on an attribute does not allow
+to set empty value to the attribute.
+
+The default value is only effective for object creation, and not later
+in the life cycle of the object. This makes the default attribute value
+mechanism weaker than some users would like.
+With the new flag, during the object update, if empty value is set
+to the attribute, the default value will be set to the attribute.
+
+SA_IMM_ATTR_STRONG_DEFAULT flag can only be set on an attribute definition
+that includes default value.
+
+
+Canonicalize attributes presented by saImmOiCcbObjectModifyCallbackT_2 (5.0)
+============================================================================
+https://sourceforge.net/p/opensaf/tickets/801
+https://sourceforge.net/p/opensaf/tickets/1651
+
+For OIs or appliers receiving ccb-callbacks, the handling of the
modify-callback
+can be particularly complex. This is due to the modify callback being defined
+by SAF as faithfully presenting the same parameters as the originating
om-client
+parameters provided over the om-api.
+
+The object modify operation allows for modifications expressed as changes
+relative to the current state of attributes. This is of course acted on by
+the imm-server resulting in an after-image for the modified object.
+
+The callback to the OI or applier is currently of the same form, in general
+requiring the OI/applier to:
+ a) know the current state of the attributes of the object or do an for
+ appliers unsafe read
+ b) to correctly compute the transformation as defined by the imm-spec.
+Particularly the later is asking quite a lot for the average OI/applier
+implementer.
+
+Only for the "special applier" is the modify callback currently canonicalized
+to contain simply the replacement values, i.e. the after operation image.
+
+To simplify the task for OI's and appliers in handling modify callbacks,
+the modify-callback instead provides the after-modify-operation-image of
+the attributes. The new callback format containing just the replacement value
+resulting from the operation must be logically equivalent to the set of all
+before-image and operation variants resulting in this replacement value.
+
+
+Class and object applier set are on local node (5.0)
+====================================================
+https://sourceforge.net/p/opensaf/tickets/1535
+
+The enhancement makes object and class applier set info consistent per node.
+This means that applier set will bind objects and classes that have already
+been bound on the local node by the same applier name.
+
+Applier name continues to be shared between nodes, while object and class
+applier bindings are kept on the originating node.
+
+
----------------------------------------
DEPENDENCIES
============
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