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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13738) DiskChecker should perform some disk IO
Date Mon, 07 May 2018 16:31:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16466106#comment-16466106
] 

Daryn Sharp commented on HADOOP-13738:
--------------------------------------

This jira was not thought out.  It's causing problems on the clusters where it's deployed.
# We had a cluster lose 10% of nodes due to this patch.  A few nodes filled up, they went
dead, and created a domino effect that caused nodes to go dead until intervention.
# Jobs may cause severe performance degradation from sync storms during a sort phase because
local dir allocator calls checkDisk.

The biggest risk is a runaway job may fill disks and cause a cluster to implode.

[~arpitagarwal], do you want me to file another jira for immediate revert?  Or do you want
to reopen this one?



> 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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