HDDS-8655. Optimize listKeys by eliminating redundant seek.

[armstrong0704]

What changes were proposed in this pull request?

Fixes HDDS-8655 - Improve listKey performance for OBS buckets

Description

This change optimizes the listKeys operation in Ozone Manager by removing a redundant seek operation during iterator initialization. Previously, the listKeys functionality would create an iterator which implicitly sought to the beginning of the table (seekToFirst), and then immediately sought to the specific start key. This caused a double-seek, which is inefficient for RocksDB, particularly when the initial seek triggers unnecessary block loads.

Changes

• Framework: Extended the Table interface to support passing a seek key directly when creating an iterator.
• Implementation: Updated RDBTable and TypedTable to handle this new parameter.
• RocksDB: Modified RDBStoreByteArrayIterator to check for a seek key in its constructor. If one is provided, it seeks directly to that position, skipping the default behavior of seeking to the first key.
• Ozone Manager: Updated the listKeys implementation to use this new iterator approach.

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/HDDS-8655

How was this patch tested?

I added a new regression test, testIteratorWithSeek, to TestRDBStore to confirm that the iterator starts correctly at the designated key. I also verified thread safety with a new concurrency test, testConcurrentIteratorWithWrites, which runs a writer and a reader in parallel to ensure stability. Existing tests in TestOmMetadataManager also pass.

[ivandika3]

Thanks @armstrong0704 for the patch. Please enable the build-branch workflow in your fork.

[armstrong0704]

@ivandika3 thanks for the input. Linters are making additional formatting. Any Guidance there?

[ivandika3]

@armstrong0704 Could you disable the auto format in the linter? Afterwards, if you are using IntelliJ IDEA, you can go to "Code Style" and import the https://github.com/apache/ozone/blob/master/hadoop-hdds/dev-support/checkstyle/checkstyle.xml

[sodonnel]

Please revert all the whitespace and comment formatting changes. Its making this diff a lot bigger than it needs to be.

[armstrong0704]

@sodonnel Done.