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https://issues.apache.org/jira/browse/HDFS-1110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12861567#action_12861567
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Jakob Homan commented on HDFS-1110:
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bq. Build a tool to generate list names that is used more than 10 times from
fsimage.
Also, we don't actually have to build a separate tool, as the offline image
viewer can quickly be extended to provide these numbers and generate the new
file. The numbers above were generated from just a few lines in a new viewer.
> Namenode heap optimization - reuse objects for commonly used file names
> -----------------------------------------------------------------------
>
> Key: HDFS-1110
> URL: https://issues.apache.org/jira/browse/HDFS-1110
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Suresh Srinivas
> Assignee: Suresh Srinivas
> Fix For: 0.22.0
>
> Attachments: hdfs-1110.patch
>
>
> There are a lot of common file names used in HDFS, mainly created by
> mapreduce, such as file names starting with "part". Reusing byte[]
> corresponding to these recurring file names will save significant heap space
> used for storing the file names in millions of INodeFile objects.
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