External Table : property name="oracle.kv.parentKey"

Question

Hi,
Base on external table example in version 2.0.23, I have major key + minor key as follow:
/user/user<i>@example.com/-/info/
When I changed the property oracle.kv.parentKey in the config file to be full majorKey instead of one part of the major key, there is no results
For example:
when the value of this property is: /user (the default in the example) - I got all KV pairs starting with /user prefix
but when I configure it to: /user/[email protected] which is the full majorKey I didn't get answers at all (although the KV exists).
Does this property support only first part of majorKey or may I misunderstand the concept?
Thanks in advanced,
YosiK

Answer 1

Hi YosiK,
The parentKey value in this context is treated the same as parentKey argument to the KVStore.storeIterator() methods. As described in the javadoc for those API calls:
parentKey - the parent key whose "child" KV pairs are to be fetched. It may be null to fetch all keys in the store. If non-null, the major key path must be a partial path and the minor key path must be empty.
So, in fact, the parentKey MUST NOT be a complete major key - it must be partial. There must be majorKey components following the parentKey that is specified. The subRange argument does interacts with this though. In the example, if you leave parentKey as "/user" but add a subRange parameter with value
"I/[email protected]/[email protected]/I" you would achieve the result that I think you originally anticipated.
- Mark