- Description has changed:
Diff:
~~~~
--- old
+++ new
@@ -7,7 +7,7 @@
This behavior is clearly documented in IMM:
> (iii) Default values are assigned at cluster restart for any attributes that
> are null/empty and that have a default.
-This ticket proposes a change that empty value attribute with default tag will
remain empty for subsequent executive reads even after cluster is rebooted.
+But with the need of above use case, this ticket proposes a change that empty
value attribute with default tag will remain empty for subsequent executive
reads even after cluster is rebooted.
The proposal:
1) Introduce a notation in IMM model file (XML) that represents a NULL value.
~~~~
---
** [tickets:#2985] imm: allow empty value attribute with default tag to
persist**
**Status:** assigned
**Milestone:** 5.18.12
**Created:** Thu Dec 13, 2018 10:17 AM UTC by Vu Minh Nguyen
**Last Updated:** Thu Dec 13, 2018 10:18 AM UTC
**Owner:** Vu Minh Nguyen
When replacing value of an attribute which has default-value tag with NULL
during runtime, NULL value will be replaced with its default value after
cluster is rebooted; in other words, that value is not persisted.
Let's take an example: user defines an attribute `maxAge` which shows how many
days user passwords will be expired, default is 30 days; if replacing with a
NULL/empty, it means the passwords will never get expired.
During runtime, if the exisiting value is replaced with NULL during runtime,
then cluster is rebooted, that value will silently be replaced with the default
without notice of user.
This behavior is clearly documented in IMM:
> (iii) Default values are assigned at cluster restart for any attributes that
> are null/empty and that have a default.
But with the need of above use case, this ticket proposes a change that empty
value attribute with default tag will remain empty for subsequent executive
reads even after cluster is rebooted.
The proposal:
1) Introduce a notation in IMM model file (XML) that represents a NULL value.
<value xsi:nil=“true” />
2) Allow *only* IMM loader to send the attribute descriptor which has NULL
value to IMMND when creating IMM object. Other applications will get default
value for NULL attribute when creating object as exactly as legacy behavior is
doing.
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