[jira] [Updated] (HDFS-10662) Optimize UTF8 string/byte conversions

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

     [ https://issues.apache.org/jira/browse/HDFS-10662?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daryn Sharp updated HDFS-10662:
-------------------------------
    Attachment: HDFS-10662.patch.1

resolved minor conflicts.

> Optimize UTF8 string/byte conversions
> -------------------------------------
>
>                 Key: HDFS-10662
>                 URL: https://issues.apache.org/jira/browse/HDFS-10662
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>         Attachments: HDFS-10662.patch, HDFS-10662.patch.1
>
>
> String/byte conversions may take either a Charset instance or its canonical name.  One might think a Charset instance would be faster due to avoiding a lookup and instantiation of a Charset, but it's not.  The canonical string name variants will cache the string encoder/decoder (obtained from a Charset) resulting in better performance.
> LOG4J2-935 describes a real-world performance boost.  I micro-benched a marginal runtime improvement on jdk 7/8.  However for a 16 byte path, using the canonical name generated 50% less garbage.  For a 64 byte path, 25% of the garbage.  Given the sheer number of times that paths are (re)parsed, the cost adds up quickly.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

---------------------------------------------------------------------
To unsubscribe, e-mail: hdfs-issues-unsubscribe@hadoop.apache.org
For additional commands, e-mail: hdfs-issues-help@hadoop.apache.org