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https://issues.apache.org/jira/browse/HDFS-1051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12848334#action_12848334
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Sanjay Radia commented on HDFS-1051:
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> NN memory ... machines with 144 GB memory or more aren't too hard to find
> these days ....
Unfortunately it is not that simple.
We currently run 50GB heaps at Yahoo and have issues in term of GC pauses and
also startup time.
(And startup time is important for HA as mentioned in my previous comment.)
Not sure how well the Java VMs scale to 144GB.
> 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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