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

["Daryn Sharp (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-10616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15375423#comment-15375423 ] 

Daryn Sharp commented on HDFS-10616:
------------------------------------

Will be an umbrella for sub-tasks to incrementally integrate large internal patches.  In combination with other internal changes (forthcoming IPC optimizations, other object allocation reductions), heap growth has dramatically slowed.

> 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
>
> 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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