KNOX-3253: Add advisory lock to the postgres table creation to avoid …

[hanicz]

…catalog race condition when multiple Knox instance start up simultaneously

KNOX-3253 - Improve Postgres DB table creation with locks

What changes were proposed in this pull request?

• Adds advisory lock to the postgres table creation to avoid catalog race condition when multiple Knox instance start up simultaneously

How was this patch tested?

Manually tested with a local setup. I had postgres running in docker desktop and a local Knox instance. I created an advisory lock and created the table manually. Knox process was waiting on the lock. After unlocking it Knox proceeded with the knox_token_metadata table creation. Verified token creation on UI and DB as well.

    <property>
        <name>gateway.service.tokenstate.impl</name>
        <value>org.apache.knox.gateway.services.token.impl.JDBCTokenStateService</value>
    </property>
    <property>
        <name>gateway.database.type</name>
        <value>postgresql</value>
    </property>
    <property>
        <name>gateway.database.port</name>
        <value>5432</value>
    </property>
    <property>
        <name>gateway.database.host</name>
        <value>localhost</value>
    </property>
    <property>
        <name>gateway.database.name</name>
        <value>mydb</value>
    </property>

Integration Tests

N/A

UI changes

N/A

[github-actions]

Test Results

7 tests   7 ✅  1s ⏱️
1 suites  0 💤
1 files    0 ❌

Results for commit 9f6bd0c.

[smolnar82]

LGTM