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Posted to hdfs-issues@hadoop.apache.org by "Arun Suresh (JIRA)" <ji...@apache.org> on 2017/09/29 20:53:03 UTC

[jira] [Updated] (HDFS-10616) Improve performance of path handling

     [ https://issues.apache.org/jira/browse/HDFS-10616?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Arun Suresh updated HDFS-10616:
-------------------------------
    Target Version/s: 3.1.0  (was: 2.9.0)

> Improve performance of path handling
> ------------------------------------
>
>                 Key: HDFS-10616
>                 URL: https://issues.apache.org/jira/browse/HDFS-10616
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs
>    Affects Versions: 2.0.0-alpha
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>         Attachments: 2.6-2.7.1-heap.png
>
>
> Path handling in the namesystem and directory is very inefficient.  The path is repeatedly resolved, decomposed into path components, recombined to a full path. parsed again, throughout the system.  This is directly inefficient for general performance, and indirectly via unnecessary pressure on young gen GC.
> The namesystem should only operate on paths, parse it once into inodes, and the directory should only operate on inodes.



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