tomscut created HDFS-16088:
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Summary: Standby NameNode process getLiveDatanodeStorageReport
request to reduce Active load
Key: HDFS-16088
URL: https://issues.apache.org/jira/browse/HDFS-16088
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: tomscut
Assignee: tomscut
As with [HDFS-13183|https://issues.apache.org/jira/browse/HDFS-13183],
NameNodeConnector#getLiveDatanodeStorageReport() can also request to SNN to
reduce the ANN load.
There are two points that need to be mentioned:
1. NameNodeConnector#getLiveDatanodeStorageReport() is
OperationCategory.UNCHECKED in FSNamesystem, so we can access SNN directly.
2. We can share the same UT(testBalancerRequestSBNWithHA) with
NameNodeConnector#getBlocks().
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