hadoop-hdfs-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2744) Extend FSDataInputStream to allow fadvise
Date Mon, 20 Jun 2016 10:15:05 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15339289#comment-15339289
] 

Steve Loughran commented on HDFS-2744:
--------------------------------------

HADOOP-13203 is implementing an fadvise-like mechanism, but in the absence of an API, it's
going to be a configuration option to set the policy for opened streams. 

Ideally I'd like: {{fadvise(policy)}}, or just the ability to set a policy when you open a
stream {{i.e Filesystem.open(path, fadvise-policy)}}. The latter would avoid having to deal
with the situation of a policy changing during the life of an input stream.

> Extend FSDataInputStream to allow fadvise
> -----------------------------------------
>
>                 Key: HDFS-2744
>                 URL: https://issues.apache.org/jira/browse/HDFS-2744
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs-client
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>              Labels: performance
>
> Now that we have direct reads from local HDFS block files (HDFS-2246), it might make
sense to make FSDataInputStream support fadvise calls. I have an application (HBase) that
would like to tell the OS that it should not buffer data in the OS buffer cache.



--
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


Mime
View raw message