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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-10656) Optimize conversion of byte arrays back to path string
Date Wed, 03 Aug 2016 16:56:20 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10656?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kihwal Lee updated HDFS-10656:
------------------------------
       Resolution: Fixed
     Hadoop Flags: Reviewed
    Fix Version/s: 3.0.0-alpha2
                   2.9.0
           Status: Resolved  (was: Patch Available)

Committed this to trunk and branch-2. 

> Optimize conversion of byte arrays back to path string
> ------------------------------------------------------
>
>                 Key: HDFS-10656
>                 URL: https://issues.apache.org/jira/browse/HDFS-10656
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>             Fix For: 2.9.0, 3.0.0-alpha2
>
>         Attachments: HDFS-10656.patch
>
>
> {{DFSUtil.byteArray2PathString}} generates excessive object allocation.
> # each byte array is encoded to a string (copy)
> # string appended to a builder which extracts the chars from the intermediate string
(copy) and adds to its own char array
> # builder's char array is re-alloced if over 16 chars (copy)
> # builder's toString creates another string (copy)
> Instead of allocating all these objects and performing multiple byte/char encoding/decoding
conversions, the byte array can be built in-place with a single final conversion to a string.



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