[
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.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
