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https://issues.apache.org/jira/browse/HADOOP-4696?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12649450#action_12649450
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Raghu Angadi commented on HADOOP-4696:
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This is mainly for emergencies. Simpler thing might be for NN to provide webui
for these commands so that it bypasses RPC traffic.
> Better handling of dfsadmin command when namenode is slow
> ---------------------------------------------------------
>
> Key: HADOOP-4696
> URL: https://issues.apache.org/jira/browse/HADOOP-4696
> Project: Hadoop Core
> Issue Type: New Feature
> Components: dfs
> Affects Versions: 0.18.2
> Reporter: Koji Noguchi
>
> Probably when hitting HADOOP-3810, Namenode became unresponsive. Large time
> spent in GC.
> All dfs/dfsadmin command were timing out.
> WebUI was coming up after waiting for a long time.
> Maybe setting a long timeout would have made the dfsadmin command go through.
> But it would be nice to have a separate queue/handler which doesn't compete
> with regular rpc calls.
> All I wanted to do was dfsadmin -safemode enter, dfsadmin -finalizeUpgrade ...
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