[jira] [Assigned] (HDFS-17019) Optimize the logic for reconfigure slow peer enable for Namenode

["Haiyang Hu (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-17019?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Haiyang Hu reassigned HDFS-17019:
---------------------------------

    Assignee: Haiyang Hu

>  Optimize the logic for reconfigure slow peer enable for Namenode
> -----------------------------------------------------------------
>
>                 Key: HDFS-17019
>                 URL: https://issues.apache.org/jira/browse/HDFS-17019
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Haiyang Hu
>            Assignee: Haiyang Hu
>            Priority: Major
>
> The logic of Reconfigure slow peer enable for Namenode requires the following optimizations:
> 1.Make SlowPeerTracker slowPeerTracker volatile.
> 2.When starting the NameNode, if the parameter dfs.datanode.peer.stats.enabled is set to false, DatanodeManager#startSlowPeerCollector() will not call, as a result the Slow peers collection thread 'slowPeerCollectorDaemon' will not be started .
>  If the parameter dfs.datanode.peer.stats.enabled is dynamically refreshed to true, the current logic will not call DatanodeManager#startSlowPeerCollector(), which to thread 'slowPeerCollectorDaemon' not started as expected, so we will optimize here



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