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https://issues.apache.org/jira/browse/HDFS-17019?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Haiyang Hu updated HDFS-17019:
------------------------------
Description:
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
optimization here
> 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
> 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 optimization
> here
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