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From Íñigo Goiri (JIRA) <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15528) Deprecate ContainerLaunch#link by using FileUtil#SymLink
Date Tue, 03 Jul 2018 19:08:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16531818#comment-16531818

Íñigo Goiri commented on HADOOP-15528:

bq. I run this patch in Windows, and I saw a good 35% reduction in latency for symlink and
7000 IO ops less than before.

To make it clear, this comes from switching from {{winutils symlink}} to {{FileUtil#symLink}}
in {{ContainerLaunch}}. Right?
The semantic change is a different discussion; that one comes from running the code directly
before instead of adding it to the cmd/sh that launches the container.

> Deprecate ContainerLaunch#link by using FileUtil#SymLink
> --------------------------------------------------------
>                 Key: HADOOP-15528
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15528
>             Project: Hadoop Common
>          Issue Type: Sub-task
>            Reporter: Giovanni Matteo Fumarola
>            Assignee: Giovanni Matteo Fumarola
>            Priority: Major
>         Attachments: HADOOP-15528-HADOOP-15461.v1.patch, HADOOP-15528-HADOOP-15461.v2.patch,
> {{ContainerLaunch}} currently uses its own utility to create links (including winutils).
> This should be deprecated and rely on {{FileUtil#SymLink}} which is already multi-platform
and pure Java.

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