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Posted to hdfs-issues@hadoop.apache.org by "tomscut (Jira)" <ji...@apache.org> on 2021/07/01 01:42:00 UTC
[jira] [Commented] (HDFS-16088) Standby NameNode process
getLiveDatanodeStorageReport request to reduce Active load
[ https://issues.apache.org/jira/browse/HDFS-16088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17372299#comment-17372299 ]
tomscut commented on HDFS-16088:
--------------------------------
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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