HDDS-7158. ldb cli command supports to scan container V3.

[ChenSammi]

https://issues.apache.org/jira/browse/HDDS-7158

[kerneltime]

@DuongNguyen0

[duongkame]

Thanks for the patch @ChenSammi. This looks good to me, only left a few nitpick comments.

[duongkame]

Let's make it an util in ManagedRocksObjectMetrics.

static void assertClosed(RocksMutableObject rocksObject) {
    ManagedRocksObjectMetrics.INSTANCE.increaseManagedObject();
    if (rocksObject.isOwningHandle()) {
      ManagedRocksObjectMetrics.INSTANCE.increaseLeakObject();
      LOG.warn("{} is not closed properly",
          rocksObject.getClass().getSimpleName());
    }
  }

[ChenSammi]

@DuongNguyen0 , thanks for the code review. RocksMutableObject.isOwningHandle has a protected access privilege, and cannot be directly called in either ManagedRocksObjectMetrics or ManagedRocksObjectUtils(I assume you mean this class). That's why move the check into the final method.

[duongkame]

Sounds good, thanks for the clarification, Sammi.

[duongkame]

Suggested change

	String cid = ((String)key).substring(0, index);
	String cid = key.toString().substring(0, index);

[duongkame]

Suggested change

	String blockId = ((String)key).substring(index);
	String blockId = key.toString().substring(index);

[duongkame]

Suggested change

	* Managed Options.
	* Managed Slice.

[guihecheng]

LGTM+1
Thanks @ChenSammi !

[ChenSammi]

Thanks @DuongNguyen0 and @guihecheng for the code review.