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https://issues.apache.org/jira/browse/HDFS-1623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13208299#comment-13208299
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Todd Lipcon commented on HDFS-1623:
-----------------------------------
Good point about upgrade failover. I think for the first cut we should disallow
the NN to start with HA enabled if the upgrade flag is passed, or if there is a
pending unfinalized upgrade. Then we can circle back on this as an improvement.
Does that seem reasonable?
Regarding DFSIO: So far we are doing cluster testing on ~100 node clusters here
at Cloudera. If you can recommend a good DFSIO setting we'll be sure to try it
(and also try with reduced block size to increase the block-related load on the
NN and DNs)
> High Availability Framework for HDFS NN
> ---------------------------------------
>
> Key: HDFS-1623
> URL: https://issues.apache.org/jira/browse/HDFS-1623
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Sanjay Radia
> Assignee: Sanjay Radia
> Attachments: HA-tests.pdf, HDFS-High-Availability.pdf, NameNode
> HA_v2.pdf, NameNode HA_v2_1.pdf, Namenode HA Framework.pdf, ha-testplan.pdf,
> ha-testplan.tex
>
>
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