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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13738) DiskChecker should perform some disk IO
Date Mon, 07 May 2018 16:49:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16466159#comment-16466159

Arpit Agarwal commented on HADOOP-13738:

[~daryn], [~kihwal], we can avoid the fsync storm by using disk IO only for HDFS-triggered
disk checks. These are already throttled to at most once per 15 minutes.

The other issue you reported - disk full - can also be handled separately. I'll file a follow
up Jira and post a patch this week.

> DiskChecker should perform some disk IO
> ---------------------------------------
>                 Key: HADOOP-13738
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13738
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Arpit Agarwal
>            Assignee: Arpit Agarwal
>            Priority: Major
>             Fix For: 2.9.0, 3.0.0-alpha2, 2.8.4
>         Attachments: HADOOP-13738-branch-2.8-06.patch, HADOOP-13738.01.patch, HADOOP-13738.02.patch,
HADOOP-13738.03.patch, HADOOP-13738.04.patch, HADOOP-13738.05.patch
> DiskChecker can fail to detect total disk/controller failures indefinitely. We have seen
this in real clusters. DiskChecker performs simple permissions-based checks on directories
which do not guarantee that any disk IO will be attempted.
> A simple improvement is to write some data and flush it to the disk.

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