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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11557) ViewFileSystem should init mount points lazily
Date Mon, 11 Sep 2017 05:22:02 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16160730#comment-16160730
] 

Hadoop QA commented on HADOOP-11557:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m  0s{color} | {color:blue}
Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red}  0m  5s{color} | {color:red}
HADOOP-11557 does not apply to trunk. Rebase required? Wrong Branch? See https://wiki.apache.org/hadoop/HowToContribute
for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HADOOP-11557 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12697194/HADOOP-11557.001.patch
|
| Console output | https://builds.apache.org/job/PreCommit-HADOOP-Build/13241/console |
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This message was automatically generated.



> ViewFileSystem should init mount points lazily
> ----------------------------------------------
>
>                 Key: HADOOP-11557
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11557
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: viewfs
>    Affects Versions: 2.6.0
>            Reporter: Gera Shegalov
>            Assignee: Gera Shegalov
>              Labels: BB2015-05-TBR
>         Attachments: HADOOP-11557.001.patch
>
>
> ViewFs initialization overhead can range from a couple to 10+ seconds linearly increasing
with the number of mounted namespaces. Eager initialization is both expensive (especially
when multiplied by MR tasks if viewfs is the defaultFS) and also provides for frustrating
experience for users interactively working via FsShell with a single mount point (MP) under
their user directory. Internal directories should not require MP initialization at all. 



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