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https://issues.apache.org/jira/browse/HDFS-1051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12847938#action_12847938
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Kevin Weil commented on HDFS-1051:
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I agree with Ryan. There are probably not more than a handful of Hadoop
clusters in the world getting close to maximizing NN memory (and machines with
144 GB memory or more aren't too hard to find these days). Twitter's biggest
challenge with bringing Hadoop closer to the runtime path is its lack of HA
guarantees.
> Umbrella Jira for Scaling the HDFS Name Service
> -----------------------------------------------
>
> Key: HDFS-1051
> URL: https://issues.apache.org/jira/browse/HDFS-1051
> Project: Hadoop HDFS
> Issue Type: New Feature
> Affects Versions: 0.22.0
> Reporter: Sanjay Radia
> Assignee: Sanjay Radia
>
> The HDFS Name service currently uses a single Namenode which limits its
> scalability. This is a master jira to track sub-jiras to address this problem.
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