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https://issues.apache.org/jira/browse/HDFS-16088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17372299#comment-17372299
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tomscut commented on HDFS-16088:
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Thanks [~hexiaoqiao] for your comment and thoughtful consideration. IMO
FSNamesystem#getDatanodeStorageReport is OperationCategory.UNCHECKED
([HDFS-6739|https://issues.apache.org/jira/browse/HDFS-6739]), so we can
request redirect to Standby on HA mode. I will add an unit test for this ASAP.
> 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
> Priority: Minor
> Labels: pull-request-available
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> 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#getLiveDatanodeStorageReport() is
> OperationCategory.UNCHECKED, so we can access SNN directly.
> 2. We can share the same UT(testBalancerRequestSBNWithHA) with
> NameNodeConnector#getBlocks().
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