[HDFS-16088] Standby NameNode process getLiveDatanodeStorageReport request to reduce Active load

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.4.0
• Fix Version/s: 3.4.0
• Component/s: namanode
• Labels: pull-request-available
• Target Version/s: 3.4.0
• Hadoop Flags: Reviewed
• Assignee: Tao Li
• Reporter: Tao Li
• Created: 25/Jun/21 03:00
• Updated: 11/Feb/24 09:08
• Resolved: 08/Jul/21 06:11

Description

As with HDFS-13183, NameNodeConnector#getLiveDatanodeStorageReport() can also request to SNN to reduce the ANN load.

There are two points that need to be mentioned:
1. FSNamesystem#getDatanodeStorageReport() is OperationCategory.UNCHECKED, so we can access SNN directly.
2. We can share the same UT(testBalancerRequestSBNWithHA) with NameNodeConnector#getBlocks().

Issue Links

• links to: GitHub Pull Request #3140