hadoop-hdfs-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8315) Datanode does not log reads
Date Mon, 04 May 2015 18:53:07 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14527052#comment-14527052
] 

Arpit Agarwal commented on HDFS-8315:
-------------------------------------

Hi Kihwal, IIRC [~gopalv] had some data indicating the request logging was a bottleneck. Can
we use an async appender?

> Datanode does not log reads
> ---------------------------
>
>                 Key: HDFS-8315
>                 URL: https://issues.apache.org/jira/browse/HDFS-8315
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>            Priority: Critical
>         Attachments: HDFS-8315.patch
>
>
> HDFS-6836 made datanode read request logging DEBUG.  There is a good reason why it was
at INFO for so many years.  This is very useful in debugging load issues. This jira will revert
HDFS-6836.
> We haven't seen it being a bottleneck on busy hbase clusters, but if someone thinks it
is a serious overhead, please make it configurable in a separate jira.



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

Mime
View raw message