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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
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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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postedNov 20, '08 at 7:01p
activeNov 20, '08 at 7:21p
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